NEXTLINK COMMUNICATIONS LLC
S-1, 1997-07-24
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 24, 1997
 
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                         NEXTLINK COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                       <C>                                       <C>
               WASHINGTON                                   4813                                   91-1738221
      (State or other jurisdiction              (Primary Standard Industrial                    (I.R.S. Employer
           of incorporation)                    Classification Code Number)                   Identification No.)
</TABLE>
 
                            ------------------------
 
  155 108TH AVENUE N.E., 8TH FLOOR, BELLEVUE, WASHINGTON 98004, (425) 519-8900
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
                         ------------------------------
 
                           R. BRUCE EASTER, JR., ESQ.
                        155 108TH AVENUE N.E., 8TH FLOOR
                           BELLEVUE, WASHINGTON 98004
                                 (425) 519-8900
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
                         ------------------------------
 
                                WITH COPIES TO:
 
<TABLE>
<S>                                                 <C>
               BRUCE R. KRAUS, ESQ.                           ROBERT E. BUCKHOLZ, JR., ESQ.
             WILLKIE FARR & GALLAGHER                              SULLIVAN & CROMWELL
               ONE CITICORP CENTER                                   125 BROAD STREET
               153 EAST 53RD STREET                              NEW YORK, NEW YORK 10004
             NEW YORK, NEW YORK 10022                                 (212) 558-4000
                  (212) 821-8000
</TABLE>
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. / /
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration number of the earlier effective
registration statement for the same offering. / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. / /
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
                                                                            PROPOSED            PROPOSED
                                                                            MAXIMUM             MAXIMUM
                                                                            OFFERING           AGGREGATE
        TITLE OF EACH CLASS OF SECURITIES             AMOUNT TO BE         PRICE PER            OFFERING           AMOUNT OF
                TO BE REGISTERED                       REGISTERED            SHARE            PRICE(1)(2)       REGISTRATION FEE
<S>                                                <C>                 <C>                 <C>                 <C>
Class A Common Stock, $.01 par value.............                                             $184,000,000          $55,758
</TABLE>
 
(1) Estimated pursuant to Rule 457(o) under the Securities Act of 1933, as
    amended, solely for the purpose of calculating the registration fee.
 
(2) Includes $         of shares of Class A Common Stock that may be sold
    pursuant to the Underwriters' over-allotment option.
                         ------------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT THAT SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE
 
    This registration statement contains two forms of prospectus: one to be used
in connection with an offering in the United States and Canada (the "U.S.
Prospectus") and one to be used in connection with a concurrent offering outside
of the United States and Canada (the "International Prospectus"). The two
prospectuses are identical except for the front and back cover pages, the
section entitled "Underwriting," and the inclusion in the International
Prospectus of a section entitled "Certain United States Federal Tax
Considerations for Non-United States Holders." Each of the alternate pages for
the International Prospectus included herein is labeled "Alternate Page."
<PAGE>
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
<PAGE>
                             SUBJECT TO COMPLETION
                                 JULY 24, 1997
 
                                                         [LOGO]
PROSPECTUS
 
         SHARES
 
NEXTLINK COMMUNICATIONS, INC.
 
CLASS A COMMON STOCK
 
($.01 PAR VALUE)
 
All of the       shares of Class A Common Stock, par value $.01 per share (the
"Class A Common Stock"), offered hereby are being sold by NEXTLINK
Communications, Inc., a Washington corporation (the "Company" or "NEXTLINK"). Of
the       shares of Class A Common Stock offered,       shares are being offered
by the U.S. Underwriters (as defined herein) in the United States and Canada
(the "U.S. Stock Offering") and       shares are being offered by the
International Underwriters (as defined herein), in a concurrent offering outside
the United States and Canada (the "International Stock Offering" and together
with the U.S. Stock Offering, the "Stock Offering"), subject to transfers
between the U.S. Underwriters and the International Underwriters (collectively,
the "Underwriters"). The initial public offering price and the aggregate
underwriting discount per share will be identical for the U.S. Stock Offering
and the International Stock Offering. See "Underwriting." The closing of the
U.S. Stock Offering and the International Stock Offering are conditioned upon
each other. Prior to the Stock Offering, there has been no public market for the
Class A Common Stock. It is currently estimated that the initial public offering
price will be between $          and $          per share of Class A Common
Stock. For factors to be considered in determining the initial public offering
price, see "Underwriting."
 
The Company has two classes of common stock, the Class A Common Stock and the
Class B Common Stock, $.01 par value per share (the "Class B Common Stock" and,
together with the Class A Common Stock, the "Common Stock"). The rights of the
Class A Common Stock and the Class B Common Stock are substantially identical,
except that holders of the Class A Common Stock are entitled to one vote per
share and holders of the Class B Common Stock are entitled to 10 votes per
share. The Class B Common Stock is fully convertible at any time into Class A
Common Stock, at the option of the holder, on a one-for-one basis. The Common
Stock votes as one class on all matters generally submitted to a vote of
stockholders, including the election of directors. See "Description of Capital
Stock."
 
Concurrently with the Stock Offering, the Company is offering $200 million
aggregate principal amount of    % Senior Notes due 2007 (the "New Notes")
pursuant to a registration statement filed under the Securities Act of 1933, as
amended (the "Debt Offering" and, together with the Stock Offering, the
"Offerings"). The consummation of the Stock Offering is not contingent upon the
consummation of the Debt Offering.
 
After the Stock Offering, Eagle River, L.L.C., a Washington limited liability
company that is controlled by Craig O. McCaw, will own approximately 87% of the
Class B Common Stock, representing    % of the total voting power of the
Company. See "Risk Factors--Control by Craig O. McCaw; Potential Conflicts of
Interest," "Security Ownership of Certain Beneficial Owners and Management" and
"Description of Capital Stock."
 
Application has been made to have the Class A Common Stock qualified for
inclusion in the Nasdaq National Market under the symbol "NXLK."
 
SEE "RISK FACTORS" BEGINNING ON PAGE 9 FOR A DISCUSSION OF CERTAIN FACTORS WHICH
SHOULD BE CONSIDERED BY POTENTIAL INVESTORS.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                            PRICE TO               UNDERWRITING           PROCEEDS TO
                                            PUBLIC                 DISCOUNT               COMPANY (1)
<S>                                         <C>                    <C>                    <C>
Per Share.................................  $                      $                      $
Total (2).................................  $                      $                      $
</TABLE>
 
(1) Before deducting offering expenses payable by the Company, estimated to be
    $         .
 
(2) The Company has granted to the Underwriters a 30-day option to purchase up
    to an aggregate of     additional shares of Class A Common Stock at the
    Price to Public, less the Underwriting Discount, solely to cover
    overallotments, if any. If the Underwriters exercise such option in full,
    the total Price to Public, Underwriting Discount and Proceeds to Company
    will be $    , $    and $    , respectively. See "Underwriting."
 
The shares of Class A Common Stock are offered subject to receipt and acceptance
by the Underwriters, to prior sale and to the Underwriters' right to reject any
order in whole or in part and to withdraw, cancel or modify the offer without
notice. It is expected that delivery of the shares of Class A Common Stock
offered hereby will be made at the office of Salomon Brothers Inc, Seven World
Trade Center, New York, New York or through the facilities of The Depository
Trust Company, on or about             , 1997.

SALOMON BROTHERS INC
              MERRILL LYNCH & CO.
                           BEAR, STEARNS & CO. INC.
                                                         LAZARD FRERES & CO. LLC
 
The date of this Prospectus is             , 1997.
<PAGE>
[MAP OF THE UNITED STATES DEPICTING THE LOCATIONS OF THE COMPANY'S NETWORKS AND
                                MARKETS SERVED]
 
CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE CLASS A COMMON STOCK,
INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN SUCH
SECURITIES, AND THE IMPOSITION OF A PENALTY BID, IN CONNECTION WITH THE
OFFERING. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING IS A SUMMARY OF CERTAIN INFORMATION CONTAINED ELSEWHERE IN
THIS PROSPECTUS. REFERENCE IS MADE TO, AND THIS PROSPECTUS SUMMARY IS QUALIFIED
IN ITS ENTIRETY BY, THE MORE DETAILED INFORMATION, INCLUDING THE COMPANY'S
CONSOLIDATED FINANCIAL STATEMENTS AND NOTES THERETO, CONTAINED HEREIN. UNLESS
THE CONTEXT OTHERWISE REQUIRES, THE TERMS "NEXTLINK" OR THE "COMPANY" REFER TO
NEXTLINK COMMUNICATIONS, INC., A WASHINGTON CORPORATION, ITS CONSOLIDATED
SUBSIDIARIES AND 40% MEMBERSHIP INTEREST IN TELECOMMUNICATIONS OF NEVADA, LLC,
WHICH OPERATES A NETWORK THAT IS MANAGED BY THE COMPANY. ALL OPERATIONAL
STATISTICS OF THE COMPANY INCLUDED IN THIS PROSPECTUS INCLUDE 100% OF THE
OPERATIONAL STATISTICS OF TELECOMMUNICATIONS OF NEVADA, LLC. THE COMPANY IS THE
SUCCESSOR TO NEXTLINK COMMUNICATIONS, L.L.C., A WASHINGTON LIMITED LIABILITY
COMPANY THAT MERGED WITH AND INTO THE COMPANY EFFECTIVE JANUARY 31, 1997. ALL
FINANCIAL AND OPERATIONAL DATA PRESENTED FOR PERIODS PRIOR TO JANUARY 31, 1997
RELATE TO NEXTLINK COMMUNICATIONS, L.L.C. CAPITALIZED TERMS USED IN THIS
PROSPECTUS, WHICH ARE NOT OTHERWISE DEFINED HEREIN, HAVE THE RESPECTIVE MEANINGS
ASCRIBED TO THEM IN THE GLOSSARY INCLUDED AS ANNEX A HERETO. INFORMATION IN THIS
PROSPECTUS, UNLESS OTHERWISE INDICATED, (I) GIVES EFFECT TO THE       FOR
REVERSE STOCK SPLIT OF BOTH THE CLASS A COMMON STOCK AND THE CLASS B COMMON
STOCK EFFECTED IN CONNECTION WITH THE STOCK OFFERING AND (II) ASSUMES THAT THE
OVER-ALLOTMENT OPTION THAT HAS BEEN GRANTED TO THE UNDERWRITERS IN THE STOCK
OFFERING WILL NOT BE EXERCISED.
 
                                  THE COMPANY
 
    NEXTLINK was founded in 1994 by Craig O. McCaw, its principal equity owner,
to provide local facilities-based telecommunications services to its targeted
customer base of small and medium-sized businesses. In July 1996, NEXTLINK
became one of the first competitive local exchange carriers ("CLECs") in the
United States to provide facilities-based switched local services under the
Telecommunications Act of 1996 (the "Telecom Act"), which opened the entire
local exchange market to competition. In each of the markets it serves, NEXTLINK
seeks to become a principal competitor to the incumbent local exchange carrier
("ILEC") for its targeted customers by providing an integrated package of high
quality local, long distance and enhanced telecommunications services at
competitive prices.
 
    The market potential for competitive telecommunications services is large
and growing. Industry sources estimate that in 1996 the total revenues from
local and long distance telecommunications services were approximately $183
billion, of which approximately $101 billion were derived from local exchange
services and approximately $82 billion from long distance services. Based upon
FCC information, aggregate revenues for local and long distance services grew at
a compounded annual rate of approximately 5.5% between 1991 and 1996. The
Telecom Act, the FCC's issuance of rules for competition and pro-competitive
policies developed by state regulatory commissions have created opportunities
for new entrants, including the Company, to capture a portion of the ILEC's
dominant, and historically monopoly controlled, market share of local services.
The development of switched local services competition, however, is in its early
stages, and the Company believes that CLECs currently serve fewer than 1% of the
total business lines in the United States.
 
    The Company's targeted customer base within the national telecommunications
market is small to medium-sized businesses, generally those businesses with
fewer than 50 access lines. Based on consultants' reports, the Company estimates
that as of year end 1996, there were approximately 170 million access lines
nationwide, including approximately 55 million business lines.
 
    The Company develops and operates high capacity, fiber optic networks with
broad market coverage in a growing number of markets across the United States.
In its switched local service markets, the Company offers its customers a
bundled package of local and long distance services and also offers dedicated
transmission and competitive access services to long distance carriers and end
users. In
 
                                       1
<PAGE>
addition, NEXTLINK offers several non-network-based enhanced communications
services to customers nationwide, including a variety of interactive voice
response ("IVR") products and a virtual communications center for mobile
professionals and workgroups.
 
    The Company currently operates 14 facilities-based networks providing
switched local and long distance services in 23 markets in seven states. The
Company anticipates that an additional three markets will be served by three
additional networks by December 1997. These 26 markets, in addition to four
other markets currently under development, have a total of approximately 8.0
million addressable business lines. The Company's goal is to add or expand
markets and market clusters to increase its addressable business lines to
approximately 11 million by the end of 1998.
 
    NEXTLINK is pursuing its targeted customer base in markets of all sizes. In
larger markets, the Company has operational networks in Los Angeles and
Philadelphia, and networks under development in Chicago and New York City. The
Company also has operational networks in medium-sized markets such as Las Vegas
and Nashville as well as smaller markets that have been clustered in Orange
County, California and central Pennsylvania. The Company will enter larger
markets on a stand-alone basis where it is economically attractive to do so and
where competitive and other market factors warrant such entry. The Company also
considers pursuing smaller markets where it can extend or cluster an existing
network with relatively little incremental capital. The Company anticipates that
the addressable business lines in the larger markets that it is currently
operating and developing will represent the majority of the Company's
addressable business lines by year end 1998.
 
    NEXTLINK has experienced significant growth in its customer base. NEXTLINK's
customer access lines in service have increased from 8,511 access lines at
December 31, 1996 to 17,409 access lines at June 30, 1997. In those markets
where the Company has offered switched local services for at least 12 months,
the Company has increased its access lines in service from 8,511 at December 31,
1996 to 15,450 at June 30, 1997. The Company has also achieved significant
growth in the rate of quarterly installations of new customer access lines, from
a total of 1,604 in the fourth quarter of 1996 to 6,153 in the second quarter of
1997. For those markets in which the Company has offered switched local services
for at least 12 months, the rate increased from 1,604 installations in the
fourth quarter of 1996 to 4,310 in the second quarter of 1997.
 
    NEXTLINK believes that a critical factor in the successful implementation of
its strategy is the quality of its management team and their extensive
experience in the telecommunications industry. The Company has built a
management team that it believes is well suited to challenge the dominance of
the ILECs in the local exchange market. Craig O. McCaw, the Company's founder
and principal equity owner, Steven W. Hooper, the Company's Chairman of the
Board, Wayne M. Perry, the Company's Vice Chairman and Chief Executive Officer,
and James F. Voelker, the Company's President, each has 15 or more years of
experience in leading companies in competitive segments of the
telecommunications industry. In addition, the presidents of the Company's
operating subsidiaries and the Company's senior officers have an average of 14
years of experience in the telecommunications industry. Mr. Hooper and Mr. Perry
are the most recent additions to the NEXTLINK executive management team, both of
whom were members of the senior management team at McCaw Cellular
Communications, Inc. ("McCaw Cellular") during the years in which it became the
nation's largest cellular telephone company. Following McCaw Cellular's sale to
AT&T Corp. in 1994, Messrs. Perry and Hooper held senior executive positions at
AT&T Wireless Services, Inc.
 
BUSINESS STRATEGY
 
    The Company has built an end user-focused, locally oriented organization
dedicated to providing switched local and long distance telephone service at
competitive prices to small and medium-sized businesses. The key components of
the Company's strategy to become a leading provider of competitive
telecommunications services and maximize penetration of its targeted customer
base are:
 
                                       2
<PAGE>
        PROVIDE INTEGRATED TELECOMMUNICATIONS SERVICES TO SMALL AND MEDIUM-SIZED
    BUSINESSES. The Company primarily focuses its sales efforts for switched
    local and long distance services on small and medium-sized businesses and
    professional groups, those businesses having fewer than 50 business lines.
    The Company's market research indicates that these customers prefer a single
    source for all of their telecommunications requirements, including products,
    billing, installation, maintenance and customer service. The Company has
    chosen to focus on this segment based on its expectations that higher gross
    margins will generally be available on services provided to these customers
    as compared with larger businesses, and that ILECs may be less likely to
    apply significant resources towards retaining these customers. The Company
    expects to attract and retain these customers through a direct sales effort
    by offering: (i) bundled local and long distance services, as well as the
    Company's enhanced communications services; (ii) up to a 10% to 15% discount
    to comparable pricing by the ILEC, depending on the individual market; and
    (iii) responsive customer service and support provided on a local level.
 
        FOSTER DECENTRALIZED LOCAL MANAGEMENT AND CONTROL.  The Company believes
    that its success will be enhanced by building locally based management teams
    that are responsible for the success of each of its operational markets. The
    Company has recruited experienced entrepreneurs and industry executives as
    presidents of each of the Company's operating subsidiaries, many of whom
    have previously built and led their own start-up telecommunications
    businesses. The local presidents and their teams are charged with achieving
    growth objectives in their respective markets and have decision making
    authority in key operating areas, including customer care, network growth
    and building connectivity, and managing the relationship and provisioning
    efforts with the ILEC. The Company has established an incentive based
    compensation policy for these management teams that is based upon the
    achievement of targeted growth and operational objectives. The Company
    believes that this local management focus will provide a critical
    competitive edge in customer acquisition and retention in each market.
 
        FURTHER DEVELOP EFFECTIVE DIRECT SALES AND CUSTOMER CARE
    ORGANIZATIONS.  NEXTLINK is building a highly motivated and experienced
    direct sales force and customer care organization that is designed to
    establish a direct and personal relationship with its customers. The Company
    has expanded its sales force from 98 salespeople at year end 1996 to 150
    salespeople at June 30, 1997. The Company expects to further increase its
    sales force to approximately 200 salespeople by year end 1997. Salespeople
    are given incentives through a commission structure that targets 40% of a
    salesperson's compensation to be based on performance. To ensure customer
    satisfaction, each customer will have a single point of contact for customer
    care who is responsible for solving problems and responding to customer
    inquiries. The Company has expanded its customer care organization from 36
    customer care employees at year end 1996 to 81 customer care employees at
    June 30, 1997.
 
        CONTINUOUSLY IMPROVE PROVISIONING PROCESSES TO ACCELERATE REVENUE
    GROWTH.  The Company believes that the immediate challenge for CLECs will be
    developing effective provisioning systems, which include the complex process
    of transitioning ILEC customers to the Company's network. Accordingly, the
    Company has begun to identify and will focus, as a key competitive strategy,
    on implementing best provisioning practices in each of its markets that will
    provide for rapid and seamless transitions of customers from the ILEC to the
    Company. To support the provisioning of its services, the Company has begun
    the long-term development of a comprehensive information technology platform
    geared toward delivering information and automated ordering and provisioning
    capability directly to the end-user as well as to the Company's internal
    staff. The Company believes that these practices and its comprehensive
    information technology platform, as developed, will provide the Company with
    a long-term competitive advantage and allow it to implement more rapidly
    switched local services in its markets and to shorten the time between the
    receipt of a customer order and the generation of revenues.
 
                                       3
<PAGE>
        DEVELOP HIGH CAPACITY FIBER OPTIC NETWORKS WITH BROAD MARKET
    COVERAGE.  NEXTLINK has and intends to continue to approach network design
    with a long-term view focusing on three key elements. First, the Company
    designs and builds its networks to provide extensive coverage of those areas
    where the density of business lines is highest and to enable the Company to
    provide direct connections to a high percentage of commercial buildings and
    ILEC central offices situated near the network. Over time, this broad
    coverage is expected to result in a higher proportion of traffic that is
    both originated and terminated on the Company's networks, which should
    provide higher long-term operating margins. Second, the Company constructs
    high capacity networks that utilize large fiber bundles capable of carrying
    high volumes of voice, data, video and Internet traffic as well as other
    high bandwidth services. This strategy should reduce potential "overbuild"
    costs and provide added network capacity as the Company adds high bandwidth
    services in the future. In Atlanta, Chicago, New York and Newark, New
    Jersey, the Company will utilize leased dark fiber and fiber capacity to
    launch facilities-based services and begin building a customer base in
    advance of completing construction of its own fiber optic network in these
    markets. Third, the Company employs a uniform technology platform based on
    Nortel DMS 500 switches (ten of which are currently installed, including one
    switch that has been installed at the Company's testing and network
    operations control center, and an additional four of which are currently
    planned to be installed by the end of the first quarter of 1998), associated
    distribution technology and other common transmission technologies enabling
    the Company to (i) deploy features and functions quickly in all of its
    networks, (ii) expand switching capacity in a cost effective manner and
    (iii) lower maintenance costs through reduced training and spare parts
    requirements. The Company also utilizes unbundled loops from the ILEC to
    connect the Company's switch and network to end user buildings and is
    evaluating other alternatives for building connectivity, including wireless
    connections, for the "last mile" of transport.
 
        CONTINUE MARKET EXPANSION.  The Company's goal is to add or expand
    markets and market clusters to increase its addressable business lines to
    approximately 11 million by the end of 1998. The Company anticipates
    continuing to expand into new geographic areas, including additional large
    markets, as opportunities arise either through building new networks,
    acquiring existing networks or acquiring or leasing dark fiber and fiber
    capacity. NEXTLINK also believes that its strategy of operating its networks
    in clusters (i) offers substantial advantages including economies of scale
    in management, marketing, sales and network operations, (ii) enables the
    Company to capture a greater percentage of regional traffic and to develop
    regional pricing plans, because the Company believes that a significant
    level of traffic terminates within 300 miles of its origination and (iii)
    provides opportunities in smaller markets that are too small to develop on a
    stand alone basis.
 
        OFFER ENHANCED COMMUNICATIONS SERVICES.  NEXTLINK offers customers
    value-added services that are not dependent on the Company's local
    facilities. The Company believes that with these services it can establish a
    customer base in a market in advance of constructing network facilities as
    well as offer additional services in markets where the Company has
    constructed facilities. The Company plans to market its enhanced
    communications service offerings in all of its markets, as well as in areas
    of planned network expansion. This should increase the Company's visibility,
    develop customer relationships and assist the Company in attracting local
    exchange customers when it operates networks in these markets.
 
                                       4
<PAGE>
                               THE STOCK OFFERING
 
<TABLE>
<S>                                            <C>
Class A Common Stock offered hereby:
  U.S. Offering..............................                     shares
  International Offering.....................                     shares
    Total....................................                     shares
Common Stock to be outstanding after the
  Stock Offering(1):
  Class A Common Stock.......................                     shares
  Class B Common Stock.......................                     shares
    Total....................................                     shares
Use of Proceeds..............................  The Company intends to use substantially all
                                               of the net proceeds from the Stock Offering
                                               for expenditures relating to the expansion of
                                               existing networks and services, the
                                               development and acquisition of new networks
                                               and services and the funding of operating
                                               losses and working capital. See "Use of
                                               Proceeds."
 
Nasdaq National Market symbol................  NXLK
 
Concurrent Debt Offering.....................  Concurrently with the Stock Offering, the
                                               Company is offering $200 million aggregate
                                               principal amount of New Notes. The
                                               consummation of the Stock Offering is not
                                               contingent upon the consummation of the Debt
                                               Offering. The use of proceeds from the Debt
                                               Offering are substantially the same as the
                                               Stock Offering. See "Description of Certain
                                               Indebtedness--Description of the New Notes."
 
Dividend Policy..............................  The Company has not paid and does not
                                               anticipate paying any dividends on the Class
                                               A Common Stock in the foreseeable future. See
                                               "Dividend Policy."
</TABLE>
 
- ------------------------
 
(1) Based on the number of shares of Class A Common Stock and Class B Common
    Stock outstanding as of June 30, 1997, and assuming the consummation of the
    Stock Offering. Excludes 7,743,767 shares of Class A Common Stock issuable
    upon the exercise of options granted to directors, officers and employees of
    the Company and 3,571,364 shares of Class B Common Stock issuable upon the
    exercise of an option that has been granted to James F. Voelker. See
    "Security Ownership of Certain Beneficial Owners and Management."
 
                                  RISK FACTORS
 
    See "Risk Factors" for a discussion of certain factors which should be
considered by potential investors.
 
                                       5
<PAGE>
          SUMMARY HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
    The summary historical consolidated financial data presented below as of
December 31, 1995 and 1996, for the period from inception (September 16, 1994)
to December 31, 1994 and for the years ended December 31, 1995 and 1996 are
derived from and qualified by reference to the audited Consolidated Financial
Statements of the Company contained elsewhere in this Prospectus. The Company's
Consolidated Financial Statements as of December 31, 1995 and 1996, for the
period from inception (September 16, 1994) to December 31, 1994 and for the
years ended December 31, 1995 and 1996, have been audited by Arthur Andersen
LLP, independent public accountants. The summary historical consolidated
financial data presented below as of March 31, 1997 and for the three months
ended March 31, 1996 and 1997, have been derived from the unaudited Interim
Consolidated Financial Statements of the Company. In the opinion of management,
the unaudited financial statements have been prepared on the same basis as the
audited financial statements and include all adjustments, which consist only of
normal recurring adjustments, necessary for a fair presentation of the financial
position and the results of operations for these periods. Operating results for
the three months ended March 31, 1997 are not necessarily indicative of the
results that may be expected for the full year ended December 31, 1997. The
operating data presented below are derived from the Company's records. All of
the data should be read in conjunction with and are qualified by reference to
"Management's Discussion and Analysis of Financial Condition and Results of
Operations," and the Consolidated Financial Statements of the Company and notes
thereto contained elsewhere in this Prospectus. The Company's financial results
for the year ended December 31, 1996 and the three months ended March 31, 1997
include the results of ITC, which was acquired in December 1996, and Linkatel
Pacific, L.P. ("Linkatel"), which was acquired in February 1997, from their
respective dates of acquisition.
 
<TABLE>
<CAPTION>
                                                        PERIOD FROM
                                                         INCEPTION                             THREE MONTHS ENDED
                                                      (SEPTEMBER 16,         YEAR ENDED
                                                         1994) TO           DECEMBER 31,           MARCH 31,
                                                       DECEMBER 31,     --------------------  --------------------
                                                           1994           1995       1996       1996       1997
                                                     -----------------  ---------  ---------  ---------  ---------
<S>                                                  <C>                <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenue............................................      $      --      $   7,552  $  25,686  $   5,370  $  10,067
Costs and expenses:
  Operating........................................            106          6,618     25,094      4,696      9,904
  Selling, general and administrative..............            232          9,563     31,353      5,516     13,274
  Deferred compensation............................             --            375      9,914         --        892
  Depreciation and amortization....................             14          3,458     10,340      1,829      4,406
                                                           -------      ---------  ---------  ---------  ---------
Loss from operations...............................           (352)       (12,462)   (51,015)    (6,671)   (18,409)
Interest income....................................             --             --     10,446        242      5,029
Interest expense...................................             --           (499)   (30,876)      (736)   (11,139)
                                                           -------      ---------  ---------  ---------  ---------
Loss before minority interests.....................           (352)       (12,961)   (71,445)    (7,165)   (24,519)
Minority interests.................................              3            230        344         49         96
                                                           -------      ---------  ---------  ---------  ---------
Net loss...........................................      $    (349)     $ (12,731) $ (71,101) $  (7,116) $ (24,423)
                                                           -------      ---------  ---------  ---------  ---------
                                                           -------      ---------  ---------  ---------  ---------
Pro forma net loss per share (1)...................                                $                     $
                                                                                   ---------             ---------
                                                                                   ---------             ---------
Pro forma weighted average number of shares
  outstanding (1)..................................
                                                                                   ---------             ---------
                                                                                   ---------             ---------
OTHER DATA:
EBITDA(2)..........................................      $    (338)     $  (8,629) $ (30,761) $  (4,842) $ (13,111)
Summary Cash Flow Information:
  Net cash used in operating activities............           (396)        (9,180)   (40,563)    (5,741)   (14,123)
  Net cash used in investing activities............           (600)       (35,417)  (227,012)   (17,389)  (114,322)
  Net cash provided by financing activities........          1,021         45,922    343,032     37,030    273,572
Capital expenditures, including acquisitions of
  businesses (net of cash acquired) and investments
  in affiliates (3)................................            600         49,230     85,872     24,144     60,687
</TABLE>
 
                                       6
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                    AS OF MARCH 31, 1997
                                                                           --------------------------------------
                                                      AS OF DECEMBER 31,               AS ADJUSTED   AS ADJUSTED
                                                     --------------------             FOR THE STOCK    FOR THE
                                                       1995       1996      ACTUAL     OFFERING(4)   OFFERINGS(5)
                                                     ---------  ---------  ---------  -------------  ------------
<S>                                                  <C>        <C>        <C>        <C>            <C>
BALANCE SHEET DATA:
Cash, cash equivalents and marketable
  securities(6)....................................  $   1,350  $ 124,520  $ 329,282    $ 469,282     $  663,282
Working capital....................................     (6,232)   137,227    337,138      477,138        671,138
Property and equipment, net........................     29,664     97,784    125,000      125,000        125,000
Total assets.......................................     53,461    390,683    649,707      789,707        989,707
Long-term debt and capital lease obligations, less
  current portion..................................      1,590    356,262    355,879      355,879        555,879
14% Preferred Shares, net of issuance costs........         --         --    280,803      280,803        280,803
Equity units subject to redemption.................         --      4,950         --           --             --
Class B common stock subject to redemption.........         --         --      4,950        4,950          4,950
Total shareholders' equity (deficit)...............     36,719    (18,654)   (49,880)      90,120         90,120
</TABLE>
 
<TABLE>
<CAPTION>
                                       AS OF        AS OF          AS OF            AS OF          AS OF        AS OF
                                     MARCH 31,    JUNE 30,     SEPTEMBER 30,    DECEMBER 31,     MARCH 31,    JUNE 30,
                                       1996         1996           1996             1996           1997         1997
                                    -----------  -----------  ---------------  ---------------  -----------  -----------
<S>                                 <C>          <C>          <C>              <C>              <C>          <C>
OPERATING DATA(7):
Route miles(8)....................         496          801            900            1,080          1,355        1,595
Fiber miles(9)....................      39,681       42,217         55,701           66,046         90,378      117,464
On-net buildings connected(10)....         206          277            299              403            449          459
Switches installed(11)............           6            6              6                9             10           12
Access lines in service (12)......       3,960        5,079          6,907            8,511         11,256       17,409
Employees.........................         255          387            456              568            679          845
</TABLE>
 
- ------------------------
 
(1) Pro forma net loss per share has been computed using the number of shares of
    Class B Common Stock as well as Class A and Class B Common Stock equivalents
    outstanding. Pursuant to the Securities and Exchange Commission Staff
    Accounting Bulletin No. 83, shares issued at prices below the initial public
    offering price of $         per share and stock options granted with
    exercise prices below the initial public offering price during the twelve
    month period preceding the date of the initial filing of the Registration
    Statement have been included in the calculation of common stock equivalent
    shares, using the treasury stock method, as if such shares and options were
    outstanding for all periods presented.
 
(2) EBITDA consists of net loss before net interest expense, minority interests,
    depreciation, amortization and deferred compensation expense. EBITDA is
    commonly used to analyze companies on the basis of operating performance,
    leverage and liquidity. While EBITDA should not be construed as a substitute
    for operating income or a better measure of liquidity than cash flow from
    operating activities, which are determined in accordance with generally
    accepted accounting principles, it is included herein to provide additional
    information with respect to the ability of the Company to meet future debt
    service, capital expenditures and working capital requirements. See
    "Consolidated Statements of Cash Flows."
 
(3) Total capital expenditures, acquisitions, and investments in affiliates were
    funded as follows:
 
<TABLE>
<CAPTION>
                                                              PERIOD FROM
                                                               INCEPTION                              THREE MONTHS ENDED
                                                            (SEPTEMBER 16,          YEAR ENDED
                                                               1994) TO            DECEMBER 31,           MARCH 31,
                                                             DECEMBER 31,      --------------------  --------------------
                                                                 1994            1995       1996       1996       1997
                                                          -------------------  ---------  ---------  ---------  ---------
<S>                                                       <C>                  <C>        <C>        <C>        <C>
      Cash expended.....................................       $     600       $  35,417  $  72,042  $  17,389  $  60,687
      Debt issued and assumed...........................              --           6,554      8,228      6,103         --
      Equity issued.....................................              --           7,259      5,602        652         --
                                                                   -----       ---------  ---------  ---------  ---------
      Total.............................................       $     600       $  49,230  $  85,872  $  24,144  $  60,687
                                                                   -----       ---------  ---------  ---------  ---------
                                                                   -----       ---------  ---------  ---------  ---------
</TABLE>
 
(4) As adjusted to give effect to the net proceeds of the Stock Offering.
 
(5) As adjusted to give effect to the net proceeds of the Stock Offering and the
    Debt Offering.
 
(6) Does not include at March 31, 1997 $102.9 million of pledged securities,
    which reduces semi-annually to zero by April 15, 1999, to secure payment
    obligations under the Company's 12 1/2% Senior Notes due April 15, 2006.
 
(7) The operating data for all periods subsequent to March 1996 include the
    statistics of the Las Vegas network, which the Company manages and in which
    the Company has a 40% membership interest.
 
                                       7
<PAGE>
(8) Route miles refers to the number of miles of the telecommunications path in
    which the Company-owned or leased fiber optic cables are installed.
 
(9) Fiber miles refers to the number of route miles installed along a
    telecommunications path, multiplied by the Company's estimate of the number
    of fibers along that path.
 
(10) Represents buildings physically connected to the Company's networks,
    excluding those connected by unbundled facilities. As of June 30, 1997, the
    Company had 1,284 buildings physically connected to its networks, including
    those buildings connected through unbundled facilities.
 
(11) As of December 31, 1996 and subsequent dates, switches installed include
    two long distance switches acquired in the ITC acquisition.
 
(12) Represents the number of access lines in service, including those lines
    which are provided through resale of Centrex services, for which the Company
    is billing services.
 
                                       8
<PAGE>
                                  RISK FACTORS
 
    Prospective investors should consider carefully, together with the other
information contained in this Prospectus, the following factors:
 
NEGATIVE CASH FLOW AND OPERATING LOSSES; LIMITED HISTORY OF OPERATIONS
 
    The development of the Company's businesses and the installation and
expansion of its networks require significant expenditures, a substantial
portion of which must be made before any revenues may be realized. Certain of
the expenditures are expensed as incurred, while certain other expenditures are
capitalized. These expenditures, together with the associated early operating
expenses, result in negative cash flow and operating losses until an adequate
revenue base is established. There can be no assurance that an adequate revenue
base will be established for any of the Company's networks. Since inception, the
Company's operations have resulted in net losses of $0.3 million for the period
from September 16, 1994 through December 31, 1994, $12.7 million for the year
ended December 31, 1995, $71.1 million for the year ended December 31, 1996 and
$24.4 million for the three months ended March 31, 1997. The Company will
continue to incur significant expenditures in the future in connection with the
acquisition, development and expansion of its networks, services and customer
base. There can be no assurance that the Company will achieve or sustain
profitability or generate positive cash flow in the future.
 
    The Company was formed in September 1994. A significant portion of the
Company's revenue for the years ended December 31, 1995 and 1996 and for the
three months ended March 31, 1997, was derived from the operations of the
Company's IVR enhanced service offering, which operations were acquired by the
Company in September 1995. Prospective investors, therefore, have very limited
historical financial information upon which to base an evaluation of the
Company's performance in the business which will be its principal focus in the
future. The Company has only recently commenced operations as a single source
service provider of telecommunications services. Given the Company's limited
operating history, there can be no assurance that it will be able to compete
successfully in the telecommunications business and to generate positive cash
flow in the future.
 
SIGNIFICANT FUTURE CAPITAL REQUIREMENTS; SUBSTANTIAL INDEBTEDNESS
 
    Expansion of the Company's existing networks and services and the
development and acquisition of new networks and services will require
significant capital expenditures. The Company estimates that the cash required
to fund its anticipated capital expenditures and operating losses (excluding
acquisitions) for the second half of 1997 and for 1998 will approximate $370
million. The Company's anticipated growth subsequent to 1998 will require
substantial additional capital. The Company will also continue to evaluate
additional revenue opportunities in each of its markets and, as and when
attractive additional opportunities develop, the Company plans to make capital
investments in its networks that might be required to pursue such opportunities.
The Company expects to meet its additional capital needs with the proceeds from
credit facilities and other borrowings, the proceeds from sales of debt
securities, the sale or issuance of equity securities and through joint
ventures. There can be no assurance, however, that the Company will be
successful in raising sufficient additional capital on terms that it will
consider acceptable or that the Company's operations will produce positive cash
flow in sufficient amounts to service its debt and to pay cash dividends on the
Company's 14% Senior Exchangeable Redeemable Preferred Shares, par value $.01
per share (the "14% Preferred Shares"). Failure to raise and generate sufficient
funds may require the Company to delay or abandon some of its planned future
expansion or expenditures, which could have a material adverse effect on the
Company's growth and its ability to compete in the telecommunications services
industry. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations--Liquidity and Capital Resources."
 
    The Company expects to incur substantial additional indebtedness (including
secured indebtedness) during the next few years to finance the acquisition,
construction and expansion of networks, the
 
                                       9
<PAGE>
purchase of additional switches, the offering of switched local and long
distance services, the introduction of other new service offerings and the
development and implementation of a comprehensive information technology
platform. As of June 30, 1997, after giving pro forma effect to the Debt
Offering, the amount of total consolidated liabilities of the Company would have
been approximately $591.8 million.
 
    The future funding requirements discussed above are based on the Company's
current estimates. There can be no assurance that actual expenditures and
funding requirements will not be significantly higher or lower.
 
RISKS ASSOCIATED WITH IMPLEMENTATION OF GROWTH STRATEGY
 
    The expansion and development of the Company's operations (including the
construction and acquisition of additional networks) will depend on, among other
things, the Company's ability to assess markets, identify, finance and complete
suitable acquisitions, design fiber optic network backbone routes, install fiber
optic cable and facilities, including switches, and obtain rights-of-way,
building access rights and any required government authorizations, franchises
and permits, all in a timely manner, at reasonable costs and on satisfactory
terms and conditions. In addition, the Company has experienced rapid growth
since its inception, and the Company believes that sustained growth places a
strain on operational, human and financial resources. In order to manage its
growth, NEXTLINK must continue to improve its operating and administrative
systems including the continued development of effective systems relating to
ordering, provisioning and billing for telecommunications services. NEXTLINK
must also continue to attract and retain qualified managerial, professional and
technical personnel. As a result, there can be no assurance that the Company
will be able to implement and manage successfully its growth strategy. The
Company's growth strategy also involves the following risks:
 
    QUALIFIED PERSONNEL. NEXTLINK believes that a critical component for its
success will be the attraction and retention of qualified managerial,
professional and technical personnel. During 1997 the Company has experienced
significant competition in the attraction and retention of personnel that
possess the skill sets that the Company is seeking. Although the Company has
been successful in attracting and retaining qualified personnel, there can be no
assurance that NEXTLINK will not experience a shortage of qualified personnel in
the future.
 
    SWITCH AND EQUIPMENT INSTALLATION.  An essential element of the Company's
current strategy is the provision of switched local service. There can be no
assurance that the installation of the required switches, fiber optic cable and
associated electronics necessary to implement the Company's business plan will
continue to be completed on time or that, during the testing of these switches
and related equipment, the Company will not experience technological problems
that cannot be resolved. The failure of the Company to install and operate
successfully additional switches and other network equipment could have a
material adverse effect upon the Company's ability to enter additional markets
as a single source provider of telecommunications services.
 
    INTERCONNECTION AGREEMENTS.  The Company has agreements for the
interconnection of its networks with the networks of the ILEC covering each
market in which NEXTLINK either has or is constructing a network, with the
exception of those markets in Illinois, New York, Georgia and New Jersey.
NEXTLINK may be required to negotiate new, or renegotiate existing
interconnection agreements as it enters new markets in the future. There can be
no assurance that the Company will successfully negotiate such other agreements
for interconnection with the ILEC or renewals of existing interconnection
agreements. The failure to negotiate required interconnection agreements could
have a material adverse effect upon the Company's ability to enter rapidly the
telecommunications market as a single source provider of telecommunications
services.
 
                                       10
<PAGE>
    ORDERING, PROVISIONING AND BILLING. The Company has developed processes and
procedures and is working with external vendors, including the ILECs, in the
implementation of customer orders for services, the provisioning, installation
and delivery of such services and monthly billing for those services. In
connection with its development of a comprehensive information technology
platform, the Company is developing automated internal systems for processing
customer orders, provisioning and billing. The failure to develop effective
internal processes and systems for these service elements or the failure of the
Company's current vendors or the ILECs to deliver effectively ordering,
provisioning (including establishing sufficient capacity and facilities on the
ILECs' networks to service the Company) and billing services could have a
material adverse effect upon the Company's ability to achieve its growth
strategy.
 
    PRODUCTS AND SERVICES.  The Company expects to continue to enhance its
systems in order to offer its customers switched local services and other
enhanced products and services in all of its networks as quickly as practicable
and as permitted by applicable regulations. The Company believes its ability to
offer, market and sell these additional products and services will be important
to the Company's ability to meet its long-term strategic growth objectives, but
is dependent on the Company's ability to obtain the needed capital, additional
favorable regulatory developments and the acceptance of such products and
services by the Company's customers. No assurance can be given that the Company
will be able to obtain such capital or that such developments or acceptance will
occur.
 
    ACQUISITIONS.  The Company intends to use the net proceeds of the Offerings
to expand its networks and service offerings through internal development and
acquisitions. Such acquisitions, if made, could divert the resources and
management time of the Company and would require integration with the Company's
existing networks and services. There can be no assurance that any such
acquisitions will occur or that any such acquisitions, if made, would be on
terms favorable to the Company or would be successfully integrated into the
Company's operations.
 
NEED TO OBTAIN AND MAINTAIN PERMITS AND RIGHTS-OF-WAY
 
    In order to acquire and develop its networks the Company must obtain local
franchises and other permits, as well as rights to utilize underground conduit
and aerial pole space and other rights-of-way and fiber capacity from entities
such as ILECs and other utilities, railroads, long distance companies, state
highway authorities, local governments and transit authorities. There can be no
assurance that the Company will be able to maintain its existing franchises,
permits and rights or to obtain and maintain the other franchises, permits and
rights needed to implement its business plan on acceptable terms. Although the
Company does not believe that any of the existing arrangements will be canceled
or will not be renewed as needed in the near future, cancellation or non-renewal
of certain of such arrangements could materially adversely affect the Company's
business in the affected metropolitan area. In addition, the failure to enter
into and maintain any such required arrangements for a particular network,
including a network which is already under development, may affect the Company's
ability to acquire or develop that network. See "Business--Company Network
Architecture."
 
COMPETITION
 
    In each of the markets served by the Company's networks, the Company
competes principally with the ILEC serving that area. ILECs are established
providers of local telephone services to all or virtually all telephone
subscribers within their respective service areas. ILECs also have long-standing
relationships with regulatory authorities at the federal and state levels. While
recent FCC administrative decisions and initiatives provide increased business
opportunities to telecommunications providers such as the Company, they also
provide the ILECs with increased pricing flexibility for their private line and
special access and switched access services. In addition, with respect to
competitive access services (as opposed to switched local exchange services),
the FCC recently proposed a rule that would provide for increased ILEC pricing
flexibility and deregulation for such access services either automatically or
 
                                       11
<PAGE>
after certain competitive levels are reached. If the ILECs are allowed by
regulators to offer discounts to large customers through contract tariffs,
engage in aggressive volume and term discount pricing practices for their
customers, and/or seek to charge competitors excessive fees for interconnection
to their networks, the income of competitors to the ILECs, including the
Company, could be materially adversely affected. If future regulatory decisions
afford the ILECs increased access services pricing flexibility or other
regulatory relief, such decisions could also have a material adverse effect on
competitors to the ILEC, including the Company.
 
    The Company also faces, and expects to continue to face, competition from
other current and potential market entrants, including long distance carriers
seeking to enter, reenter or expand entry into the local exchange market place
such as AT&T Corp. ("AT&T"), MCI Communications Corporation ("MCI") and Sprint
Corporation ("Sprint"), and from other CLECs, competitive access providers
("CAPs"), cable television companies, electric utilities, microwave carriers,
wireless telephone system operators and private networks built by large
end-users. In addition, a continuing trend toward combinations and strategic
alliances in the telecommunications industry could give rise to significant new
competitors. The Telecom Act includes provisions which impose certain regulatory
requirements on all local exchange carriers, including competitors such as the
Company, while granting the FCC expanded authority to reduce the level of
regulation applicable to any or all telecommunications carriers, including
ILECs. The manner in which these provisions of the Telecom Act are implemented
and enforced could have a material adverse effect on the Company's ability to
successfully compete against ILECs and other telecommunications service
providers. The Company also competes with equipment vendors and installers, and
telecommunications management companies with respect to certain portions of its
business. Many of the Company's current and potential competitors have
financial, personnel and other resources, including brand name recognition,
substantially greater than those of the Company, as well as other competitive
advantages over the Company.
 
    The Company also competes with long distance carriers in the provision of
long distance services. Although the long distance market is dominated by four
major competitors, AT&T, MCI, Sprint and WorldCom, Inc., hundreds of other
companies also compete in the long distance marketplace.
 
REGULATION
 
    The Company is subject to varying degrees of federal, state and local
regulation. The Company is not currently subject to price cap or rate of return
regulation, nor is it currently required to obtain FCC authorization for the
installation, acquisition or operation of its network facilities. Further, the
FCC has determined that non-dominant carriers, such as the Company and its
subsidiaries, are not required to file interstate tariffs for interstate access
and domestic long distance service on an ongoing basis. On February 13, 1997,
the United States Court of Appeals for the District of Columbia granted motions
for a stay of the FCC detariffing order pending judicial review of that order.
The result of this stay is that carriers must continue to file tariffs for
interstate long distance services. The FCC requires the Company and its
subsidiaries to file interstate tariffs on an ongoing basis for interstate
traffic, international traffic and access services. The Company's subsidiaries
that provide or will provide intrastate services are also generally subject to
certification and tariff or price list filing requirements by state regulators.
Although passage of the Telecom Act should result in increased opportunities for
companies that are competing with the ILECs, no assurance can be given that
changes in current or future regulations adopted by the FCC or state regulators
or other legislative or judicial initiatives relating to the telecommunications
industry would not have a material adverse effect on the Company. In addition,
although the Telecom Act provides incentives to the ILECs that are subsidiaries
of Regional Bell Operating Companies ("RBOCs") to enter the long distance
service market, there can be no assurance that these ILECs will negotiate
quickly with competitors such as the Company for the required interconnection of
the competitor's networks with those of the ILEC. On July 2, 1997, SBC
Communications Inc. ("SBC") and its local exchange carrier subsidiaries filed a
lawsuit in the United States District Court for the Northern District of
 
                                       12
<PAGE>
Texas challenging on Constitutional grounds the Telecom Act restrictions
applicable to the RBOCs only. The plaintiffs in the case seek both a declaratory
judgment and an injunction against the enforcement of the challenged provisions.
See "Business--Regulatory Overview."
 
    On May 8, 1997, the FCC released an order establishing a significantly
expanded federal telecommunications subsidy regime which both increased the size
of existing subsidies and created new subsidy funds. Although the FCC order
describes a method for determining the amount the Company must contribute to
support these subsidies, the Company is currently unable to quantify the amount
of these payments that it will be required to make, or the effect that these
required payments will have on its financial condition. In the May 8 order, the
FCC also announced that it will soon revise its rules for subsidizing service
provided to consumers in high cost areas. See "Business--Regulatory Overview."
 
    On July 18, 1997, the United States Court of Appeals for the Eighth Circuit
overturned many of the rules the FCC had established pursuant to the Telecom Act
governing the terms under which CLECs may, among other things, interconnect with
ILECs, resell ILEC services, lease unbundled ILEC network elements and terminate
traffic on ILEC networks. The Eighth Circuit decision substantially limits the
FCC's jurisdiction and expands the state regulators' jurisdiction to set and
enforce rules governing the development of local competition. As a result, it is
more likely that the rules governing local competition will vary substantially
from state to state. Most states, however, have already begun to establish rules
for local competition that are consistent with the FCC rules overturned by the
Eighth Circuit. If a patchwork of state regulations were to develop, it could
increase the Company's costs of regulatory compliance and could make competitive
entry in some markets more difficult and expensive than in others. See
"Business--Regulatory Overview."
 
DEPENDENCE ON LARGE CUSTOMERS
 
    To date the Company has derived a substantial proportion of its revenues
from certain large customers of its competitive access services and its IVR
enhanced communication service offerings, the loss of one or more of which could
have a material adverse effect on the Company's operating results. The Company's
10 largest customers accounted for approximately 66%, 51% and 29% of the
Company's revenues in 1995 and 1996 and for the three months ended March 31,
1997, respectively. The Company does not have long-term service contracts with
most of these customers. The Company will continue to be dependent upon a small
number of customers for the majority of its revenues until such time, if any, as
the Company generates substantial revenues from the provision of switched local
and long distance communications services.
 
RAPID TECHNOLOGICAL CHANGES
 
    The telecommunications industry is subject to rapid and significant changes
in technology. The effect on the Company of technological changes, including
changes relating to emerging wireline and wireless transmission and switching
technologies, cannot be predicted.
 
DEPENDENCE ON KEY PERSONNEL
 
    The Company's businesses are managed by a small number of key executive
officers, the loss of certain of whom could have a material adverse effect on
the Company. The Company believes that its future success will depend in large
part on its ability to develop a large and sophisticated sales force and its
ability to attract and retain highly skilled and qualified personnel. Most of
the executive officers of the Company, including the presidents of its operating
subsidiaries, do not have employment agreements. Although the Company has been
successful in attracting and retaining qualified personnel, there can be no
assurance that NEXTLINK will not experience a shortage of qualified personnel in
the future.
 
                                       13
<PAGE>
VARIABILITY OF QUARTERLY OPERATING RESULTS
 
    As a result of the significant expenses associated with the expansion and
development of its networks and services and the variability of the level of
revenues generated through sales of NEXTLINK's IVR enhanced communications
services, the Company anticipates that its operating results could vary
significantly from period to period.
 
CONTROL BY CRAIG O. MCCAW; POTENTIAL CONFLICTS OF INTEREST
 
    Craig O. McCaw, primarily through his majority ownership and control of
Eagle River Investments, L.L.C., a Washington limited liability company ("Eagle
River"), controls approximately    % of the Company's total voting power after
giving effect to the Stock Offering. It is anticipated that Eagle River will
transfer its interest in the Company to OneComm, L.L.C., an entity that is
controlled by Mr. McCaw. As a result, Mr. McCaw will have the ability to control
the direction and future operations of the Company. In addition to his
investment in the Company through Eagle River, Mr. McCaw has significant
investments in other communications companies, including Nextel Communications,
Inc., Teledesic Corporation, Cable Plus, Inc. and AT&T, some of which could
compete with the Company as a single source provider of telecommunications
services or act as a supplier to the Company of certain telecommunications
services. The Company does not have a noncompetition agreement with either Mr.
McCaw or Eagle River.
 
ABSENCE OF PRIOR PUBLIC MARKET
 
    Prior to the Stock Offering, there has been no public market for the Class A
Common Stock, and there can be no assurance that an active trading market for
the Class A Common Stock will develop or be sustained. The initial public
offering price of the Class A Common Stock will be determined through
negotiations with the representatives of the Underwriters. There can be no
assurance that future market prices for the Class A Common Stock will equal or
exceed the initial public offering price set forth on the cover page of this
Prospectus. The market prices of securities of growth companies similar to the
Company have historically been highly volatile. Future announcements concerning
the Company or its competitors, including quarterly results, technological
innovations, services or government legislation or regulation, may have a
significant effect on the market price of the Class A Common Stock. See
"Underwriting."
 
SHARES ELIGIBLE FOR FUTURE SALE
 
    No prediction can be made as to the effect, if any, that future sales of
shares, or the availability of shares for future sale, will have on the market
price of the Class A Common Stock prevailing from time to time. Sales of
substantial amounts of Class A Common Stock (including shares issued upon the
exercise of outstanding stock options), or the perception that such sales could
occur, could adversely affect the prevailing market prices of the Class A Common
Stock. Upon completion of the Stock Offering, the Company will have outstanding
      shares of Class A Common Stock, excluding       shares of Class A Common
Stock which have been granted under the Plan (as defined herein) but have not
vested. Of these shares, the       shares of Class A Common Stock to be sold in
the Stock Offering will be freely tradable without restriction under the
Securities Act of 1933, as amended (the "Securities Act"), except for any such
shares which may be acquired by an "affiliate" of the Company as that term is
defined in Rule 144 under the Securities Act (an "Affiliate").
 
    The Company, its directors and its executive officers, who hold in the
aggregate       shares of Class A Common Stock (or currently exercisable options
to purchase Class A Common Stock) and       shares of Class B Common Stock (or
currently exercisable options to purchase Class B Common Stock), have agreed not
to offer, sell or contract to sell, or otherwise dispose of, directly or
indirectly, or announce an offering of, any shares of Class A Common Stock or
any securities convertible into, or
 
                                       14
<PAGE>
exchangeable for, shares of Class A Common Stock for a period of 180 days from
the date of this Prospectus, without the prior written consent of Salomon
Brothers Inc, except under limited circumstances. See "Underwriting."
 
    On April 25, 1997, the Company filed a registration statement on Form S-8
(File No. 333-25907) to register 10,000,000 shares of Class A Common Stock
reserved for issuance or sale under the Plan. Upon completion of the Stock
Offering, there will be outstanding options to purchase a total of       shares
of Class A Common Stock.
 
    In addition, the Company has granted certain holders of its capital stock
rights to require the registration for sale of such capital stock under the
Securities Act. See "Description of Capital Stock -- Registration Rights."
 
    The actual sale or the perceived potential for the sale of shares of Common
Stock could have an adverse effect on the market price for the Class A Common
Stock. See "Shares Eligible for Future Sale."
 
DILUTION OF SHARES
 
    Purchasers of the Class A Common Stock offered hereby will experience
immediate and substantial dilution in net tangible book value per share of
$         . See "Dilution."
 
RISKS REGARDING FORWARD LOOKING STATEMENTS
 
    The statements contained in this Prospectus and in associated prior filings
by the Company with the Securities and Exchange Commission which are not
historical facts are "forward-looking statements" (as such term is defined in
the Private Securities Litigation Reform Act of 1995), which can be identified
by the use of forward-looking terminology such as "believes", "expects", "may",
"will", "should", or "anticipates" or the negative thereof or other variations
thereon or comparable terminology, or by discussions of strategy that involve
risks and uncertainties. Management wishes to caution the reader that these
forward-looking statements, such as the Company's plans to build and acquire
networks in new areas, its anticipation of revenues from designated markets, and
statements regarding the development of the Company's businesses, the markets
for the Company's services and products, the Company's anticipated capital
expenditures, regulatory reform and other statements contained herein regarding
matters that are not historical facts, are only predictions. No assurance can be
given that the future results will be achieved; actual events or results may
differ materially as a result of risks facing the Company. Such risks include,
but are not limited to, the Company's ability to successfully market its
services to current and new customers, access markets, identify, finance and
complete suitable acquisitions, design and construct fiber optic networks,
install cable and facilities, including switching electronics, and obtain
rights-of-way, building access rights and any required governmental
authorizations, franchises and permits, all in a timely manner, at reasonable
costs and on satisfactory terms and conditions, as well as regulatory,
legislative and judicial developments that could cause actual results to differ
materially from the future results indicated; expressed or implied, in such
forward-looking statements.
 
                                  THE COMPANY
 
    NEXTLINK Communications, L.L.C., the predecessor to the Company, was
organized on September 16, 1994, to provide local facilities-based
telecommunications services with a focus on delivering switched services to
commercial customers. On January 31, 1997, NEXTLINK Communications, L.L.C. was
merged with and into the Company, a Washington corporation. The principal
executive offices of the Company are located at 155 108th Avenue N.E., 8th
Floor, Bellevue, Washington 98004. The telephone number is (425) 519-8900.
 
                                       15
<PAGE>
                                USE OF PROCEEDS
 
    The net proceeds to the Company from the sale of the Class A Common Stock
offered in the Stock Offering are estimated to be approximately $140 million
($161.1 million if the Underwriters' over-allotment option is exercised in full)
after deduction of Underwriters' discounts and estimated expenses payable by the
Company. The Company intends to use substantially all of the net proceeds from
the Stock Offering for expenditures relating to the expansion of existing
networks and services, the development and acquisition of new networks and
services and the funding of operating losses and working capital. The Company
has no agreement, agreement in principle, understanding or arrangement with any
person to effect any material acquisition. See "Management's Decision and
Analysis of Financial Condition and Results of Operations -- Liquidity and
Capital Resources" and "Business--The Company's Telecommunications Services."
Pending such uses, the net proceeds to the Company will be invested in
short-term, investment grade securities.
 
    Concurrently with the Stock Offering, the Company is offering $200 million
aggregate principal amount of New Notes pursuant to the Debt Offering. The
consummation of the Stock Offering is not contingent upon the consummation of
the Debt Offering. The uses of proceeds from the Debt Offering by the Company
are substantially the same as the Stock Offering. Should the Debt Offering not
be consummated, the Company intends to seek additional capital. See
"Management's Decision and Analysis of Financial Condition and Results of
Operations --Liquidity and Capital Resources."
 
                                DIVIDEND POLICY
 
    The Company has not paid any cash dividends on its Class A Common Stock. The
Company intends to retain future earnings, if any, to finance the development
and expansion of its businesses and, therefore, does not anticipate paying any
dividends on the Class A Common Stock in the foreseeable future. The decision
whether to pay dividends will be made by the Board of Directors in light of
conditions then existing, including the Company's results of operations,
financial condition and requirements, business conditions and other factors. The
terms of the 14% Preferred Shares prohibit the payment of dividends on any
capital stock that does not expressly rank senior to, or on a parity with, the
14% Preferred Shares as to dividend rights until full cumulative dividends are
paid on the 14% Preferred Shares. In addition, the terms of the Company's
12 1/2% Senior Notes due April 15, 2006 (the "12 1/2% Notes") and the New Notes
offered pursuant to the Debt Offering, restrict the Company's ability to pay
cash dividends.
 
                                       16
<PAGE>
                                    DILUTION
 
    As of March 31, 1997, the net tangible book value of the Company was a
deficit of $114.9 million or $    per share of Common Stock. Net tangible book
value per share represents the Company's net worth less intangible assets of
$65.0 million divided by          shares of Common Stock. After giving effect to
the sale by the Company of       shares of Class A Common Stock pursuant to the
Stock Offering (at an assumed initial public offering price of $         per
share) and after deducting the underwriting discount and expenses of the Stock
Offering, the pro forma net tangible book value of the Company at March 31,
1997, would have been $         million, or $         per share of Common Stock.
Such amount represents an immediate increase in pro forma net tangible book
value of $         per share of Common Stock to the existing stockholders and an
immediate dilution to new investors of $         per share of Common Stock. The
following table illustrates the dilution in pro forma net tangible book value
per share to new investors:
 
<TABLE>
<S>                                                     <C>        <C>
Assumed initial public offering price.................             $
  Net tangible book value before the Stock Offering...  $
  Increase in net tangible book value attributable to
    net proceeds of the Stock Offering................
Pro forma net tangible book value after the Stock
  Offering............................................
Dilution to new investors.............................             $
</TABLE>
 
    The following table sets forth as of March 31, 1997, on a pro forma basis,
the difference between the existing holders of Common Stock and the purchasers
of shares of Class A Common Stock in the Stock Offering, with respect to the
number of shares of Common Stock purchased from the Company, the total
consideration paid and the average price per share of Common Stock paid:
 
<TABLE>
<CAPTION>
                                                        SHARES PURCHASED       TOTAL CONSIDERATION
                                                     ----------------------  ------------------------   AVERAGE PRICE
                                                      NUMBER      PERCENT      AMOUNT       PERCENT    PER SHARE PAID
                                                     ---------  -----------  -----------  -----------  ---------------
<S>                                                  <C>        <C>          <C>          <C>          <C>
Existing Stockholders..............................
New Investors......................................
                                                     ---------       -----   -----------       -----   ---------------
Total..............................................
                                                     ---------       -----   -----------       -----   ---------------
                                                     ---------       -----   -----------       -----   ---------------
</TABLE>
 
                                       17
<PAGE>
                                 CAPITALIZATION
                             (DOLLARS IN THOUSANDS)
 
    The following table sets forth as of March 31, 1997, the actual
capitalization of the Company, the capitalization of the Company as adjusted to
reflect the issuance of the Class A Common Stock pursuant to the Stock Offering
and the capitalization of the Company as further adjusted to reflect the Debt
Offering. This table should be read in conjunction with the Selected
Consolidated Financial and Operating Data and the Consolidated Financial
Statements and notes thereto included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                                                  AS OF MARCH 31, 1997
                                                                        -----------------------------------------
<S>                                                                     <C>           <C>             <C>
                                                                                       AS ADJUSTED    AS ADJUSTED
                                                                                         FOR THE        FOR THE
                                                                           ACTUAL     STOCK OFFERING   OFFERINGS
                                                                        ------------  --------------  -----------
Cash, cash equivalents and marketable securities(1)...................  $    329,282   $    469,282   $   663,282
                                                                        ------------  --------------  -----------
                                                                        ------------  --------------  -----------
Current portion of long-term obligations and payable to affiliate.....         2,649          2,649         2,649
Capital lease obligations, less current portion.......................         5,879          5,879         5,879
12 1/2% Senior Notes due April 15, 2006                                      350,000        350,000       350,000
      % Senior Notes due 2007.........................................            --             --       200,000
                                                                        ------------  --------------  -----------
  Total debt..........................................................       358,528        358,528       558,528
                                                                        ------------  --------------  -----------
Minority interests(2).................................................           212            212           212
14% Preferred Shares, par value $.01 per share, 25,000,000 shares
  authorized and 5,700,000 shares issued and outstanding, net of
  issuance costs(3)...................................................       280,803        280,803       280,803
Class B Common Stock, par value $.01 per share, 1,178,128 shares
  issued and outstanding subject to redemption by the Company(4)......         4,950          4,950         4,950
Shareholders' equity (deficit):
  Class A Common Stock, par value $.01 per share, 250,000,000 shares
    authorized and 0 issued and outstanding (      shares issued and
    outstanding, as adjusted)(5)......................................            --        140,000       140,000
  Class B Common Stock, par value $.01 per share, stated at amounts
    paid in, 100,000,000 shares authorized and 81,944,956 shares
    issued and outstanding(6).........................................        65,527         65,527        65,527
  Accumulated deficit.................................................      (115,407)      (115,407)     (115,407)
                                                                        ------------  --------------  -----------
    Total shareholders' equity (deficit)..............................       (49,880)        90,120        90,120
                                                                        ------------  --------------  -----------
    Total capitalization..............................................  $    594,613   $    734,613   $   934,613
                                                                        ------------  --------------  -----------
                                                                        ------------  --------------  -----------
</TABLE>
 
- ------------------------
 
(1) Does not include at March 31, 1997 $102.9 million of pledged securities,
    which reduces semi-annually to zero by April 15, 1999, to secure payment
    obligations under the Company's 12 1/2% Senior Notes due April 15, 2006.
 
(2) Minority interests primarily represent a nominal equity investment in
    substantially all of the Company's subsidiaries from a company that is
    wholly owned by Craig O. McCaw.
 
(3) The Company has not ascribed any value to the Contingent Warrants to
    purchase an aggregate of 5% of each class of Junior Shares (as defined) of
    the Company on a fully diluted basis as of February 1, 1998 (the "Contingent
    Warrants"). The Contingent Warrants become exercisable on February 1, 1998,
    but will expire upon the consummation of the Stock Offering. Underwriting
    discounts and issuance costs in the offering of the 14% Preferred Shares
    were approximately $11 million.
 
(4) The Company has provided to the holders of these shares an option to require
    the Company to repurchase such shares at $8.79 per share beginning in the
    fourth quarter of 1999. Such repurchase obligation shall terminate if during
    the three year period commencing upon the 180th day after the date of this
    Prospectus, the average daily closing price of the Class A Common Stock
    during any consecutive 60 trading day period is greater than $8.79.
 
(5) Issued and outstanding does not include 4,569,244 shares of Class A Common
    Stock issuable upon exercise of outstanding options.
 
(6) Issued and outstanding does not include 3,571,364 shares of Class B Common
    Stock issuable upon exercise of an option granted to James F. Voelker.
 
                                       18
<PAGE>
         SELECTED HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
    The selected historical consolidated financial data presented below as of
December 31, 1995 and 1996, for the period from inception (September 16, 1994)
to December 31, 1994 and for the years ended December 31, 1995 and 1996 are
derived from and qualified by reference to the audited Consolidated Financial
Statements of the Company contained elsewhere in this Prospectus. The Company's
Consolidated Financial Statements as of December 31, 1995 and 1996, for the
period from inception (September 16, 1994) to December 31, 1994 and for the
years ended December 31, 1995 and 1996, have been audited by Arthur Andersen
LLP, independent public accountants. The summary historical consolidated
financial data presented below as of March 31, 1997 and for the three months
ended March 31, 1996 and 1997, have been derived from the unaudited Interim
Consolidated Financial Statements of the Company. In the opinion of management,
the unaudited financial statements have been prepared on the same basis as the
audited financial statements and include all adjustments, which consist only of
normal recurring adjustments, necessary for a fair presentation of the financial
position and the results of operations for these periods. Operating results for
the three months ended March 31, 1997 are not necessarily indicative of the
results that may be expected for the full year ended December 31, 1997. The
operating data presented below are derived from the Company's records. All of
the data should be read in conjunction with and are qualified by reference to
"Management's Discussion and Analysis of Financial Condition and Results of
Operations," and the Consolidated Financial Statements of the Company and notes
thereto contained elsewhere in this Prospectus. The Company's financial results
for the year ended December 31, 1996 and the three months ended March 31, 1997
include the results of ITC, which was acquired in December 1996, and Linkatel
Pacific, L.P. ("Linkatel"), which was acquired in February 1997, from their
respective dates of acquisition.
 
<TABLE>
<CAPTION>
                                                        PERIOD FROM
                                                         INCEPTION                             THREE MONTHS ENDED
                                                      (SEPTEMBER 16,         YEAR ENDED
                                                         1994) TO           DECEMBER 31,           MARCH 31,
                                                       DECEMBER 31,     --------------------  --------------------
                                                           1994           1995       1996       1996       1997
                                                     -----------------  ---------  ---------  ---------  ---------
<S>                                                  <C>                <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenue............................................      $      --      $   7,552  $  25,686  $   5,370  $  10,067
Costs and expenses:
  Operating........................................            106          6,618     25,094      4,696      9,904
  Selling, general and administrative..............            232          9,563     31,353      5,516     13,274
  Deferred compensation............................             --            375      9,914         --        892
  Depreciation and amortization....................             14          3,458     10,340      1,829      4,406
                                                           -------      ---------  ---------  ---------  ---------
Loss from operations...............................           (352)       (12,462)   (51,015)    (6,671)   (18,409)
Interest income....................................             --             --     10,446        242      5,029
Interest expense...................................             --           (499)   (30,876)      (736)   (11,139)
                                                           -------      ---------  ---------  ---------  ---------
Loss before minority interests.....................           (352)       (12,961)   (71,445)    (7,165)   (24,519)
Minority interests.................................              3            230        344         49         96
                                                           -------      ---------  ---------  ---------  ---------
Net loss...........................................      $    (349)     $ (12,731) $ (71,101) $  (7,116) $ (24,423)
                                                           -------      ---------  ---------  ---------  ---------
                                                           -------      ---------  ---------  ---------  ---------
Pro forma net loss per share (1)...................                                $                     $
                                                                                   ---------             ---------
                                                                                   ---------             ---------
Pro forma weighted average number of shares
  outstanding (1)..................................
                                                                                   ---------             ---------
                                                                                   ---------             ---------
OTHER DATA:
EBITDA(2)..........................................      $    (338)     $  (8,629) $ (30,761) $  (4,842) $ (13,111)
Summary Cash Flow Information:
  Net cash used in operating activities............           (396)        (9,180)   (40,563)    (5,741)   (14,123)
  Net cash used in investing activities............           (600)       (35,417)  (227,012)   (17,389)  (114,322)
  Net cash provided by financing activities........          1,021         45,922    343,032     37,030    273,572
Capital expenditures, including acquisitions of
  businesses (net of cash acquired) and investments
  in affiliates (3)................................            600         49,230     85,872     24,144     60,687
</TABLE>
 
                                       19
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                    AS OF MARCH 31, 1997
                                                                           --------------------------------------
                                                      AS OF DECEMBER 31,               AS ADJUSTED   AS ADJUSTED
                                                     --------------------             FOR THE STOCK    FOR THE
                                                       1995       1996      ACTUAL     OFFERING(4)   OFFERINGS(5)
                                                     ---------  ---------  ---------  -------------  ------------
<S>                                                  <C>        <C>        <C>        <C>            <C>
BALANCE SHEET DATA:
Cash, cash equivalents and marketable
  securities(6)....................................  $   1,350  $ 124,520  $ 329,282    $ 469,282     $  663,282
Working capital....................................     (6,232)   137,227    337,138      477,138        671,138
Property and equipment, net........................     29,664     97,784    125,000      125,000        125,000
Total assets.......................................     53,461    390,683    649,707      789,707        989,707
Long-term debt and capital lease obligations, less
  current portion..................................      1,590    356,262    355,879      355,879        555,879
14% Preferred Shares, net of issuance costs........         --         --    280,803      280,803        280,803
Equity units subject to redemption.................         --      4,950         --           --             --
Class B common stock subject to redemption.........         --         --      4,950        4,950          4,950
Total shareholders' equity (deficit)...............     36,719    (18,654)   (49,880)      90,120         90,120
</TABLE>
 
<TABLE>
<CAPTION>
                                       AS OF        AS OF          AS OF            AS OF          AS OF        AS OF
                                     MARCH 31,    JUNE 30,     SEPTEMBER 30,    DECEMBER 31,     MARCH 31,    JUNE 30,
                                       1996         1996           1996             1996           1997         1997
                                    -----------  -----------  ---------------  ---------------  -----------  -----------
<S>                                 <C>          <C>          <C>              <C>              <C>          <C>
OPERATING DATA(7):
Route miles(8)....................         496          801            900            1,080          1,355        1,595
Fiber miles(9)....................      39,681       42,217         55,701           66,046         90,378      117,464
On-net buildings connected(10)....         206          277            299              403            449          459
Switches installed(11)............           6            6              6                9             10           12
Access lines in service (12)......       3,960        5,079          6,907            8,511         11,256       17,409
Employees.........................         255          387            456              568            679          845
</TABLE>
 
- ------------------------
 
(1) Pro forma net loss per share has been computed using the number of shares of
    Class B Common Stock as well as Class A and Class B Common Stock equivalents
    outstanding. Pursuant to the Securities and Exchange Commission Staff
    Accounting Bulletin No. 83, shares issued at prices below the initial public
    offering price of $         per share and stock options granted with
    exercise prices below the initial public offering price during the twelve
    month period preceding the date of the initial filing of the Registration
    Statement have been included in the calculation of common stock equivalent
    shares, using the treasury stock method, as if such shares and options were
    outstanding for all periods presented.
 
(2) EBITDA consists of net loss before net interest expense, minority interests,
    depreciation, amortization and deferred compensation expense. EBITDA is
    commonly used to analyze companies on the basis of operating performance,
    leverage and liquidity. While EBITDA should not be construed as a substitute
    for operating income or a better measure of liquidity than cash flow from
    operating activities, which are determined in accordance with generally
    accepted accounting principles, it is included herein to provide additional
    information with respect to the ability of the Company to meet future debt
    service, capital expenditures and working capital requirements. See
    "Consolidated Statements of Cash Flows."
 
(3) Total capital expenditures, acquisitions, and investments in affiliates were
    funded as follows:
 
<TABLE>
<CAPTION>
                                                              PERIOD FROM
                                                               INCEPTION                              THREE MONTHS ENDED
                                                            (SEPTEMBER 16,          YEAR ENDED
                                                               1994) TO            DECEMBER 31,           MARCH 31,
                                                             DECEMBER 31,      --------------------  --------------------
                                                                 1994            1995       1996       1996       1997
                                                          -------------------  ---------  ---------  ---------  ---------
<S>                                                       <C>                  <C>        <C>        <C>        <C>
      Cash expended.....................................       $     600       $  35,417  $  72,042  $  17,389  $  60,687
      Debt issued and assumed...........................              --           6,554      8,228      6,103         --
      Equity issued.....................................              --           7,259      5,602        652         --
                                                                   -----       ---------  ---------  ---------  ---------
      Total.............................................       $     600       $  49,230  $  85,872  $  24,144  $  60,687
                                                                   -----       ---------  ---------  ---------  ---------
                                                                   -----       ---------  ---------  ---------  ---------
</TABLE>
 
(4) As adjusted to give effect to the net proceeds of the Stock Offering.
 
(5) As adjusted to give effect to the net proceeds of the Stock Offering and the
    Debt Offering.
 
(6) Does not include at March 31, 1997 $102.9 million of pledged securities,
    which reduces semi-annually to zero by April 15, 1999, to secure payment
    obligations under the Company's 12 1/2% Senior Notes due April 15, 2006.
 
(7) The operating data for all periods subsequent to March 1996 include the
    statistics of the Las Vegas network, which the Company manages and in which
    the Company has a 40% membership interest.
 
                                       20
<PAGE>
(8) Route miles refers to the number of miles of the telecommunications path in
    which the Company-owned or leased fiber optic cables are installed.
 
(9) Fiber miles refers to the number of route miles installed along a
    telecommunications path, multiplied by the Company's estimate of the number
    of fibers along that path.
 
(10) Represents buildings physically connected to the Company's networks,
    excluding those connected by unbundled facilities. As of June 30, 1997, the
    Company had 1,284 buildings physically connected to its networks, including
    those buildings connected through unbundled facilities.
 
(11) As of December 31, 1996 and subsequent dates, switches installed include
    two long distance switches acquired in the ITC acquisition.
 
(12) Represents the number of access lines in service, including those lines
    which are provided through resale of Centrex services, for which the Company
    is billing services.
 
                                       21
<PAGE>
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS
 
OVERVIEW
 
    Since its inception in 1994, the Company has executed a strategy of
constructing and acquiring fiber optic networks and acquiring related
telecommunications businesses. Over this period, the Company has begun
development or construction of, acquired, leased fibers or capacity on, or
entered into agreements to acquire local telecommunications networks in 30
markets in 11 states.
 
    The Company's primary focus is providing switched local and long distance
and enhanced communications services to small and medium-sized commercial
end-user customers. As of July 21, 1997, the Company offered such services in 23
of its 30 markets. The Company expects to commence the offering of switched
local and long distance services in an additional three markets by December 1997
and four additional markets in 1998. In addition, the Company plans to acquire,
build or develop networks in new areas, expand its current networks, and also
explore the acquisition or licensing of additional enhanced communications
services and other telecommunications service providers. These efforts should
allow the Company to increase its presence in the marketplace, and facilitate
providing a single source solution for the telecommunications needs of its
customers.
 
    The Company builds its networks to encompass the significant business
concentrations in each area it serves, focusing on direct connections to
end-user locations and ILEC central offices. The Company employs a uniform
technology platform for each of its local exchange networks that is based on the
Nortel DMS 500 digital local and long distance combination switching platform
and associated distribution technology. As of July 21, 1997, the Company had
nine operational Nortel DMS 500 switches and currently plans to install four
additional switches by the end of the first quarter of 1998. The Company also
has installed a Nortel DMS 500 switch in its NEXTLAB facility, a fully
functional model of one of the Company's networks, which serves as a testing
facility for switch software and the Company's products and services and will
serve as the Company's network operations control center.
 
    The Company also provides enhanced communications services including: (i)
interactive voice response services, which provide an interface between the
Company's clients and their customers for a variety of applications; and (ii)
Magic Number, the Company's virtual communications center that allows mobile
professionals and workgroups to access a suite of commonly used communications
services from any telephone in the public switched telephone network.
Historically, the Company has derived a substantial proportion of its revenues
from these services. As local and long distance revenues are expected to grow
more rapidly than revenues for the Company's enhanced communications services,
the Company anticipates that, over the next five years, local and long distance
revenues will account for a significantly higher percentage of total revenues.
 
    The development of the Company's businesses and the construction,
acquisition and expansion of its networks require significant expenditures, a
substantial portion of which are incurred before the realization of revenues.
These expenditures, together with the associated early operating expenses,
result in negative cash flow until an adequate customer base is established.
However, as the customer base grows, the Company expects that incremental
revenues can be generated with decreasing incremental operating expenses, which
may provide positive contributions to cash flow. The Company has made the
strategic decision to build high capacity networks with broad market coverage,
which initially increases its level of capital expenditures and operating
losses. The Company believes that over the long term this will enhance the
Company's financial performance by increasing the traffic flow over the
Company's networks. The Company has recently entered into leased dark fiber and
fiber capacity arrangements, which allow the Company, by installing one or more
switches and related electronics, to enter a market prior to completing
construction of its own fiber optic network.
 
                                       22
<PAGE>
    Prior to January 31, 1997, the Company was a limited liability company that
was classified and taxed as a partnership for federal and state income tax
purposes. As of January 31, 1997, the Company was subject to federal and state
income tax.
 
RESULTS OF OPERATIONS
 
    THREE MONTHS ENDED MARCH 31, 1997 COMPARED WITH THREE MONTHS ENDED MARCH 31,
     1996
 
    Revenue increased 87% to $10.1 million for the first quarter of 1997,
compared to $5.4 million in the same period in 1996. The increase was, in part,
due to the acquisition of ITC, a switch-based long distance reseller based in
Salt Lake City, Utah in December 1996, as well as 30% growth in local and long
distance services (both switched and resale) and enhanced communications
services. First quarter 1997 revenues increased 14% over pro forma fourth
quarter 1996 revenues, considering inclusion of ITC revenues for both periods.
The first quarter 1997 revenues included $4.5 million derived from local and
long distance services (both switched and resale), $3.7 million derived from
enhanced communications services and $1.9 million from competitive access and
dedicated line services. This compares to $0.5 million derived from local and
long distance services (both switched and resale), $3.2 million from enhanced
communications services and $1.7 million from competitive access and dedicated
line services during the first quarter of 1996. The Company's interactive voice
response subsidiary contributed 30% and 56% of the Company's revenues during the
first quarter of 1997 and 1996, respectively. The revenues generated by this
subsidiary, while generally increasing over time, have tended to fluctuate on a
quarter to quarter basis as the revenues are generally event driven and seasonal
in nature.
 
    The Company began offering switched local and long distance services in
seven of its markets in July 1996, an eighth market in January 1997, three
additional markets including Cleveland and Columbus Ohio, as well as Las Vegas,
in April 1997 and most recently in 12 additional markets, including
Philadelphia, Los Angeles and cluster markets in Orange County, California in
July 1997. As of March 31, 1997, the Company had 11,256 access lines in service.
Revenues from the provision of such services are expected to continue to
increase as a percentage of total revenues over future periods.
 
    Operating expenses consist of costs directly related to providing
facilities-based network and enhanced communications services and also include
salaries and benefits and related costs of operations and engineering personnel.
Operating expenses increased 111% due to the effect of the ITC acquisition, an
increase in network costs related to the provision of local, long distance and
enhanced communications services and the Company's increase in employees as well
as other related costs primarily to expand the Company's switched local and long
distance service businesses in its existing and planned markets.
 
    Selling, general and administrative expenses ("SG&A") include salaries and
related personnel costs, facilities expenses, sales and marketing, consulting
and legal fees and equity in loss of affiliates. SG&A increased 141% due to the
ITC acquisition, the Company's increase in employees as well as other related
costs in order to expand the Company's switched local and long distance service
businesses in its existing and planned markets.
 
    Deferred compensation expenses were recorded in connection with the
Company's Equity Option Plan which was discontinued and replaced by the
Company's Stock Option Plan in April 1997. The option grants under the Equity
Option Plan were considered compensatory and were accounted for similar to stock
appreciation rights. Compensation expense is recognized over the vesting periods
based on the excess of the fair value of the options over their exercise prices.
 
    Depreciation expense increased primarily due to placement in service of
additional telecommunications network assets, including switches, fiber optic
cable, network electronics and related equipment. Amortization of intangible
assets increased primarily as a result of the ITC acquisition in December 1996,
as well as the acquisition of Linkatel, in February 1997.
 
                                       23
<PAGE>
    Interest expense during 1997 (net of $0.3 million capitalized) primarily
reflects the interest expense associated with the 12 1/2% Notes. See
"--Liquidity and Capital Resources." Pursuant to Statement of Financial
Accounting Standards No. 34, the Company capitalizes a portion of its interest
costs as part of the construction cost of its communications networks. Interest
income results from investment of excess cash and certain securities that have
been pledged as collateral for the 12 1/2% Notes.
 
    YEAR ENDED DECEMBER 31, 1996 COMPARED WITH YEAR ENDED DECEMBER 31, 1995
 
    Revenue increased 240% to $25.7 million for 1996, compared to $7.6 million
in 1995. The increase was due to recording a full year of revenue during 1996
for acquisitions completed during 1995 as well as growth in dedicated and
enhanced communications services revenues. The 1996 revenues included $15.3
million derived from enhanced communications services, $6.4 million from
competitive access and dedicated line services and $4.0 million from local and
long distance services (both switched and resale). This compares to $3.4 million
derived from enhanced communications services, $3.2 million from competitive
access and dedicated line services and $1.0 million from local exchange resale
services during 1995. The Company's interactive voice response subsidiary, which
was acquired in September 1995, provided 52% of the Company's revenues during
1996, including one customer who accounted for 23% of the Company's total
revenues. The revenues generated by this subsidiary, while generally increasing
over time, have tended to fluctuate on a quarter to quarter basis as a
substantial portion of the revenues are derived from a small number of customers
and the revenues are generally event driven and seasonal in nature.
 
    The Company began offering switched local services in seven of its markets
in July 1996. Revenues from the provision of local services, while not material
during 1996, are expected to represent an increasing component of total revenues
in future periods.
 
    Operating expenses increased 279% due to the effect of acquisitions and the
Company's continued addition of employees as well as other related costs in
order to expand the Company's switched local service businesses in its existing
and planned markets. In addition, the Company experienced increased network
costs related to the provision of local and long distance services.
 
    SG&A increased 228% due to acquisitions completed during 1995, the Company's
continued addition of employees as well as other related costs in order to
expand the Company's switched local service businesses in its existing and
planned markets and to a lesser degree due to activities associated with the
marketing of the Company's enhanced communications service offerings.
 
    Deferred compensation expenses are recorded in connection with the Company's
Equity Option Plan. The option grants under this plan are considered
compensatory and are accounted for similar to stock appreciation rights. The
Company recorded noncash charges of $9.9 million and $0.4 million during 1996
and 1995, respectively, resulting from an increase in value of the underlying
securities as well as the grant of additional options. See Note 10 to
Consolidated Financial Statements.
 
    Depreciation expense increased during 1996 primarily due to placement in
service of additional telecommunications network assets, including switches,
fiber optic cable, network electronics and related equipment as well as due to
acquisitions completed during 1995 and early 1996. Amortization of intangible
assets increased as a result of acquisitions completed during 1995 and 1996.
 
    Interest expense during 1996 (net of $0.9 million capitalized) primarily
reflects the interest expense associated with the 12 1/2% Notes. See
"--Liquidity and Capital Resources." Pursuant to Statement of Financial
Accounting Standards No. 34, the Company capitalizes a portion of its interest
costs as part of the construction cost of its communications networks. Interest
income results from certain securities that have been pledged as collateral for
interest payments on the 12 1/2% Notes and investment of excess cash.
 
                                       24
<PAGE>
    YEAR ENDED DECEMBER 31, 1995 COMPARED WITH PERIOD FROM INCEPTION (SEPTEMBER
     16, 1994) TO DECEMBER 31, 1994
 
    From inception through December 31, 1995, the Company acquired certain
operating assets and one company. These acquisitions have been accounted for
utilizing the purchase method of accounting, and accordingly, the Company's
Consolidated Financial Statements include the results of operations of these
acquisitions from the dates of acquisition. The acquired assets and liabilities
were recorded at their estimated fair value on the acquisition dates, and
appropriate amounts were allocated to intangible assets, including goodwill.
 
    The Company generated its first revenues, a total of $7.6 million, in 1995.
Of these revenues, $3.2 million were derived from competitive access and
dedicated line services, $1.0 million from local exchange resale services and
$3.4 million from interactive voice response services.
 
    Operating expenses increased from $106,000 in 1994 to $6.6 million in 1995.
This increase is due to the acquisitions described above and expansion of the
business.
 
    SG&A increased from $232,000 in 1994 to $9.6 million in 1995. SG&A increased
substantially as a result of acquisitions and the development of the Company's
systems and structure to support the anticipated growth of its business.
 
    Depreciation increased from $6,500 in 1994 to $1.1 million in 1995 due to
the added property, plant and equipment as a result of the acquisitions and
expansion of the networks completed in 1995. Amortization of intangible assets
increased from $7,000 in 1994 to $2.3 million in 1995 due to the acquisitions
and the resulting increase in intangible assets.
 
    Interest expense was $499,000 in 1995 and related primarily to a note to
Eagle River that was subsequently converted to contributed capital on December
1, 1995.
 
    Minority interest in net losses increased from $3,000 in 1994 to $230,000 in
1995, due to increases in losses and the addition of minority members' interest
in certain of the Company's acquired subsidiaries. The net loss before minority
interest was $13.0 million and the net loss was $12.7 million in 1995 compared
to $352,000 and $349,000, respectively for 1994.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The competitive local telecommunications service business is a capital
intensive business. The Company's existing operations have required and will
continue to require substantial capital investment for the acquisition and
installation of fiber, electronics and related equipment in order to provide
switched services in the Company's networks and the funding of operating losses
during the start-up phase of each market. In addition, the Company's strategic
plan calls for expansion into additional market areas. Such expansion will
require significant additional capital for: potential acquisitions of businesses
or assets; design, development and construction of new networks; and the funding
of operating losses during the start-up phase of each market. During the first
quarter of 1997, the Company used $14.1 million in cash for operating
activities, compared to $5.7 million for the same period in 1996. The increase
was primarily due to a substantial increase in the Company's activities
associated with the development and initiation of switched local and long
distance services and, to a lesser degree, due to the activities associated with
the Company's enhanced communications services operations. During the first
quarter of 1997, the Company invested an additional $60.7 million in cash in
property and equipment, acquisitions of telecommunications businesses and equity
investments in telecommunications businesses. During the same period in 1996,
the Company invested $17.4 million in cash in property and equipment and
acquisitions of telecommunications assets and businesses.
 
    In June 1997, the Company entered into an eight year exclusive agreement,
with an option to renew for five additional years, with a company that has
excess fiber capacity in each of Atlanta, Chicago, New
 
                                       25
<PAGE>
York, Newark, New Jersey and Philadelphia, which it agreed to make available to
the Company in each of those markets at a substantial discount to the wholesale
rates charged by other vendors of capacity. In addition to the capacity
arrangement described above, the Company also has entered into a 20-year lease
of 1,692 fiber miles over an existing 47-mile fiber network in New York City,
which extends from the Wall Street area north to midtown Manhattan. In June
1997, the Company paid $11 million in full satisfaction of its obligations under
this lease, $6 million of which has been placed in escrow pending completion of
certain building connections by the lessor. These arrangements will allow the
Company to accelerate its entry into each of these markets by enabling the
Company to avoid a significant portion of the infrastructure development and
construction time that would otherwise be required to launch switched local and
long distance services in these markets. Although these agreements have reduced
the initial capital expenditures necessary to enter these markets, the Company
has not as a result reduced its overall planned capital expenditures through
1998.
 
    In June 1997, the Company also executed a definitive agreement to acquire an
existing fiber optic network in downtown Philadelphia in order to extend its
existing network in Pennsylvania. The acquisition is subject to regulatory and
other consents and is anticipated to be consummated by the end of 1997. During
the interim period prior to closing, the Company is operating under a 36 fiber
capacity agreement with the seller.
 
    On February 4, 1997, the Company completed the acquisition of substantially
all of the assets of Linkatel, a Los Angeles-based competitive access
telecommunications provider. At the time of acquisition, Linkatel operated an 80
mile fiber optic telecommunications network covering several markets in the
Orange and Los Angeles county areas. The total purchase price of $42.5 million
consisted of a cash payment of $36.1 million (including the release of $6.0
million which was deposited into escrow during 1996) plus the repayment of debt
of $5.6 million and the assumption of net liabilities totaling $0.8 million.
 
    In January 1997, the Company obtained rights-of-way to expand its existing
Salt Lake City network into Provo and Orem, Utah. The Company is in the process
of completing the expansion of this network to Provo and Orem and expects to
begin providing switched local and long distance services in Provo and Orem in
September 1997.
 
    Prior to April 1996, the Company funded its expenditures with approximately
$55.0 million of cash equity investments from two entities that are controlled
by Craig O. McCaw. On April 25, 1996, the Company raised net proceeds of
approximately $190 million through the issuance of $350 million in aggregate
principal amount of the 12 1/2% Notes. The Company used $117.7 million of the
gross proceeds to purchase U.S. government securities, representing funds
sufficient to provide for payment in full of interest on the 12 1/2% Notes
through April 15, 1999, and used an additional $32.2 million to repay certain
advances and accrued interest from Eagle River, a company formed and owned by
Mr. McCaw. In addition, the Company incurred costs of $9.8 million in connection
with the financing. Interest payments on the 12 1/2% Notes are due
semi-annually. On January 31, 1997, the Company completed the sale of $285
million aggregate liquidation preference of 14% Preferred Shares which, after
deducting issuance costs, resulted in net proceeds to the Company of
approximately $274 million. The 14% Preferred Shares will accrue dividends at
the rate of 14% per annum. On or before February 1, 2002, dividends may, at the
option of the Company, be paid in cash or by issuing additional Preferred Shares
with an aggregate liquidation preference equal to the amount of such dividends.
After February 1, 2002, dividends must be paid in cash. The Company has issued
an additional 201,706 shares of 14% Preferred Shares in satisfaction of the
first quarterly dividend. Since inception, the Company also has issued Class A
Units valued at $15.5 million primarily for the acquisition of certain
telecommunications assets and businesses, which Units were converted to shares
of Class B Common Stock of the Company on January 31, 1997.
 
    The Company will use the net proceeds from the Offerings and existing
unrestricted cash balances for expenditures relating to the construction,
acquisition and operation of telecommunications networks
 
                                       26
<PAGE>
and service providers and the offering of telecommunications services in those
areas where the Company currently operates or intends to operate. Should the
Debt Offering not be consummated, the Company intends to seek additional
capital. Expenditures for the construction and operation of networks include (i)
the purchase and installation of switches and related electronics in existing
networks and in networks to be constructed or acquired in new or adjacent
markets, (ii) the purchase and installation of fiber optic cable and electronics
to expand existing networks and develop new networks, including the connection
of new buildings, (iii) the development of its comprehensive information
technology platform and (iv) the funding of operating losses and working
capital. The Company may also acquire or invest in businesses that consist of
existing networks or companies engaged in businesses similar to those engaged in
by the Company and its subsidiaries or other complementary businesses.
 
    As of March 31, 1997, the Company had unrestricted cash and investments of
$329.3 million and $663.3 million on a pro forma basis after giving effect to
the Offerings. The Company estimates that the cash required to fund its
anticipated capital expenditures and operating losses (excluding acquisitions)
for the second half of 1997 and for 1998 will approximate $370 million.
 
    The Company's planned growth subsequent to 1998 will require substantial
additional capital to fund capital expenditures, acquisition opportunities,
working capital and any future operating losses. The Company will continue to
evaluate additional revenue opportunities in each of its markets and, as
attractive opportunities develop, the Company plans to make additional capital
investments in its networks to pursue such opportunities. The Company expects to
meet its additional capital needs with the proceeds from sales or issuance of
equity securities, credit facilities and other borrowings, sales of additional
debt securities, and through joint ventures. There can be no assurance, however,
that the Company will be successful in raising sufficient additional capital on
terms that it will consider acceptable or that the Company's operations will
produce positive consolidated cash flow in sufficient amounts to meet its
interest and dividend obligations on outstanding securities. Failure to raise
and generate sufficient funds may require the Company to delay or abandon some
of its planned future expansion or expenditures, which could have a material
adverse effect on the Company's growth and its ability to compete in the
telecommunications services industry.
 
    In addition, the Company's operating flexibility with respect to certain
business matters is, and will continue to be, limited by covenants associated
with the 12 1/2% Notes and the New Notes. Among other things, these covenants
limit the ability of the Company and its subsidiaries to incur additional
indebtedness, create liens upon assets, apply the proceeds from the disposal of
assets, make dividend payments and other distributions on capital stock and
redeem capital stock. In addition, the terms of the 14% Preferred Shares contain
certain covenants that may limit the Company's operating flexibility with
respect to the incurrence of indebtedness and issuance of additional preferred
shares. There can be no assurance that such covenants will not adversely affect
the Company's ability to finance its future operations or capital needs or to
engage in other business activities that may be in the interest of the Company.
The Company was in compliance with all covenants associated with the 12 1/2%
Notes and 14% Preferred Shares as of June 30, 1997.
 
NEW ACCOUNTING STANDARD
 
    In February 1997, the Financial Accounting Standards Board issued Statement
No. 128, "Earnings Per Share" ("SFAS 128"), which revises the calculation and
presentation provisions of Accounting Principles Board Opinion 15 and related
interpretations. SFAS 128 is effective for the Company's fiscal year ending
December 31, 1997, and retroactive application is required. The Company does not
expect the implementation of SFAS 128 to have a material effect on earnings per
share amounts previously reported.
 
                                       27
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    NEXTLINK was founded in 1994 by Craig O. McCaw, its principal equity owner,
to provide local facilities-based telecommunications services to its targeted
customer base of small and medium-sized businesses. In July 1996, NEXTLINK
became one of the first competitive local exchange carriers ("CLECs") in the
United States to provide facilities-based switched local services under the
Telecommunications Act of 1996 (the "Telecom Act"), which opened the entire
local exchange market to competition. In each of the markets it serves, NEXTLINK
seeks to become a principal competitor to the incumbent local exchange carrier
("ILEC") for its targeted customers by providing an integrated package of high
quality local, long distance and enhanced telecommunications services at
competitive prices.
 
    The market potential for competitive telecommunications services is large
and growing. Industry sources estimate that in 1996 the total revenues from
local and long distance telecommunications services were approximately $183
billion, of which approximately $101 billion were derived from local exchange
services and approximately $82 billion from interLATA long distance services.
Based upon FCC information, aggregate revenues for local and long distance
services grew at a compounded annual rate of approximately 5.5% between 1991 and
1996. The Telecom Act, the FCC's issuance of rules for competition and
pro-competitive policies developed by state regulatory commissions have created
opportunities for new entrants, including the Company, to capture a portion of
the ILEC's dominant, and historically monopoly controlled, market share of local
services. The development of switched local services competition, however, is in
its early stages, and the Company believes that CLECs currently serve fewer than
1% of the total business lines in the United States.
 
    The Company's targeted customer base within the national telecommunications
market is small to medium-sized businesses, generally those businesses with
fewer than 50 access lines. Based on consultants' reports, the Company estimates
that as of year end 1996, there were approximately 170 million access lines
nationwide, including approximately 55 million business lines.
 
    The Company develops and operates high capacity, fiber optic networks with
broad market coverage in a growing number of markets across the United States.
In its switched local service markets, the Company offers its customers a
bundled package of local and long distance services and also offers dedicated
transmission and competitive access services to long distance carriers and end
users. In addition, NEXTLINK offers several non-network-based enhanced
communications services to customers nationwide, including a variety of
interactive voice response ("IVR") products and a virtual communications center
for mobile professionals and workgroups.
 
    The Company currently operates 14 facilities-based networks providing
switched local and long distance services in 23 markets in seven states. The
Company anticipates that an additional three markets will be served by three
additional networks by December 1997. These 26 markets, in addition to four
other markets currently under development, have a total of approximately 8.0
million addressable business lines. The Company's goal is to add or expand
markets and market clusters to increase its addressable business lines to
approximately 11 million by the end of 1998.
 
    NEXTLINK is pursuing its targeted customer base in markets of all sizes. In
larger markets, the Company has operational networks in Los Angeles and
Philadelphia, and networks under development in Chicago and New York City. The
Company also has operational networks in medium-sized markets such as Las Vegas
and Nashville as well as smaller markets that have been clustered in Orange
County, California and central Pennsylvania. The Company will enter larger
markets on a stand-alone basis where it is economically attractive to do so and
where competitive and other market factors warrant such entry. The Company also
considers pursuing smaller markets where it can extend or cluster an existing
network with relatively little incremental capital. The Company anticipates that
the addressable business
 
                                       28
<PAGE>
lines in the larger markets that it is currently operating and developing will
represent the majority of the Company's addressable business lines by year end
1998.
 
    NEXTLINK has experienced significant growth in its customer base. NEXTLINK's
customer access lines in service have increased from 8,511 access lines at
December 31, 1996 to 17,409 access lines at June 30, 1997. In those markets
where the Company has offered switched local services for at least 12 months,
the Company has increased its access lines in service from 8,511 at December 31,
1996 to 15,450 at June 30, 1997. The Company has also achieved significant
growth in the rate of quarterly installations of new customer access lines from
a total of 1,604 in the fourth quarter of 1996 to 6,153 in the second quarter of
1997. For those markets in which the Company has offered switched local services
for at least 12 months, the rate increased from 1,604 installations in the
fourth quarter of 1996 to 4,310 in the second quarter of 1997.
 
    NEXTLINK believes that a critical factor in the successful implementation of
its strategy is the quality of its management team and their extensive
experience in the telecommunications industry. The Company has built a
management team that it believes is well suited to challenge the dominance of
the ILECs in the local exchange market. Craig O. McCaw, the Company's founder
and principal equity owner, Steven W. Hooper, the Company's Chairman of the
Board, Wayne M. Perry, the Company's Vice Chairman and Chief Executive Officer,
and James F. Voelker, the Company's President, each has 15 or more years of
experience in leading companies in competitive segments of the
telecommunications industry. In addition, the presidents of the Company's
operating subsidiaries and the Company's senior officers have an average of 14
years of experience in the telecommunications industry. Mr. Hooper and Mr. Perry
are the most recent additions to the NEXTLINK executive management team, both of
whom were members of the senior management team at McCaw Cellular
Communications, Inc. ("McCaw Cellular") during the years in which it became the
nation's largest cellular telephone company. Following McCaw Cellular's sale to
AT&T Corp. in 1994, Messrs. Perry and Hooper held senior executive positions at
AT&T Wireless Services, Inc.
 
MARKET OPPORTUNITY
 
    Prior to 1984, AT&T dominated both the local exchange and long distance
marketplace by owning the operating entities that provided both local exchange
and long distance services to most of the U.S. population. While long distance
competition began to emerge in the late 1970s, the critical event triggering the
growth of long distance competition was the breakup of AT&T and the separation
of its local and long distance businesses as mandated by the Modified Final
Judgment relating to the breakup of AT&T (the "MFJ"). To foster competition in
the long distance market, the MFJ prohibited AT&T's divested local exchange
businesses, the RBOCs, from acting as a single source provider of
telecommunications services.
 
    The Company believes that a similarly critical event occurred in 1996 with
the passage of the Telecom Act. In most locations throughout the United States,
the ILEC has operated with a virtual monopoly over the provision of most local
exchange services. However, just as competition slowly emerged in the long
distance business prior to the MFJ, competitive opportunities also have slowly
emerged over the last 10 years at the local level.
 
    Industry sources estimate that in 1996 the total revenues from local and
long distance telecommunications services were approximately $183 billion, of
which approximately $101 billion were derived from local exchange services and
approximately $82 billion from interLATA long distance services. Based upon FCC
information, aggregate revenues for local and long distance services grew at a
compounded annual rate of approximately 5.5% between 1991 and 1996. Although the
MFJ relating to the breakup of AT&T established the preconditions for
competition in the market for long distance services in 1984, the market for
local exchange services has until recently been virtually closed to competition
and has largely been dominated by regulated monopolies. Efforts to open the
local exchange market began in the late
 
                                       29
<PAGE>
1980s on a state-by-state basis when CAPs began offering dedicated private line
transmission and access services. These types of services together currently
account for approximately 12% of the total local exchange revenues. CAPs were
restricted, often by state laws, from providing the other, more frequently used
services such as basic and switched services, which today account for
approximately 88% of local exchange revenues.
 
    The Telecom Act and the FCC's issuance of rules for competition,
particularly those requiring the interconnection of all networks and the
interchange of traffic among the ILECs and the CLECs, as well as pro-competitive
policies already developed by state regulatory commissions, have caused
fundamental changes in the structure of the local exchange markets. Although the
Eighth Circuit decision substantially limits the FCC's jurisdiction and expands
the state regulators' jurisdiction to set and enforce rules governing the
development of local competition, most states have already begun to establish
rules for local competition that are consistent with the FCC rules overturned by
the Eighth Circuit. See "-- Regulatory Overview."
 
    These developments create opportunities for new entrants offering local
exchange services to capture a portion of the ILEC's dominant, and historically
monopoly controlled, market share of local services. The development of switched
local services competition, however, is in its early stages and the Company
believes that CLECs currently serve fewer than 1% of the total business lines in
the United States.
 
    NEXTLINK believes that the provisions of the Telecom Act requiring the ILECs
to cooperate on a technical level with competitors are as significant as the
Telecom Act's provisions eliminating state laws barring competitors from
entering the local exchange services market. Under the Telecom Act, the FCC and
state regulators are required to ensure that ILECs implement:
 
    - Interconnection--provides competitors the right to connect to the ILECs'
      networks at any technically feasible point and to obtain access to its
      rights-of-way;
 
    - Unbundling of the Local Network--allows competitors to purchase and
      utilize components of the ILECs' network selectively;
 
    - Reciprocal Compensation--establishes the framework for pricing between the
      CLEC and the ILEC for use of each other's networks; and
 
    - Number Portability--allows ILEC customers to retain their current
      telephone numbers when they switch to a CLEC.
 
    In addition, the Telecom Act provides that ILECs that are subsidiaries of
RBOCs cannot combine in-region, long distance services across local access and
transport areas ("LATAs") with the local services they offer until they have
demonstrated that they have complied with certain regulatory requirements
relating to local competition. See "--Regulatory Overview." The Company believes
it will have an opportunity to gain market share in certain markets by combining
local and long distance services in a single offering to its customers before
that market's ILEC, if it is a subsidiary of a RBOC, is permitted to do so.
 
BUSINESS STRATEGY
 
    The Company has built an end user-focused, locally oriented organization
dedicated to providing switched local and long distance telephone service at
competitive prices to small and medium-sized businesses. The key components of
the Company's strategy to become a leading provider of competitive
telecommunications services and to maximize penetration of its targeted customer
base are:
 
        PROVIDE INTEGRATED TELECOMMUNICATIONS SERVICES TO SMALL AND MEDIUM-SIZED
    BUSINESSES.  The Company primarily focuses its sales efforts for switched
    local and long distance services on small and medium-sized businesses and
    professional groups, those businesses having fewer than 50
 
                                       30
<PAGE>
    business lines. The Company's market research indicates that these customers
    prefer a single source for all of their telecommunications requirements,
    including products, billing, installation, maintenance and customer service.
    The Company has chosen to focus on this segment based on its expectations
    that higher gross margins will generally be available on services provided
    to these customers as compared with larger businesses, and that ILECs may be
    less likely to apply significant resources towards retaining these
    customers. The Company expects to attract and retain these customers through
    a direct sales effort by offering: (i) bundled local and long distance
    services, as well as the Company's enhanced communications services; (ii) up
    to a 10% to 15% discount to comparable pricing by the ILEC, depending on the
    individual market; and (iii) responsive customer service and support
    provided on a local level.
 
        FOSTER DECENTRALIZED LOCAL MANAGEMENT AND CONTROL.  The Company believes
    that its success will be enhanced by building locally based management teams
    that are responsible for the success of each of its operational markets. The
    Company has recruited experienced entrepreneurs and industry executives as
    presidents of each of the Company's operating subsidiaries, many of whom
    have previously built and led their own start-up telecommunications
    businesses. The local presidents and their teams are charged with achieving
    growth objectives in their respective markets and have decision making
    authority in key operating areas, including customer care, network growth
    and building connectivity, and managing the relationship and provisioning
    efforts with the ILEC. The Company has established an incentive based
    compensation policy for these management teams that is based upon the
    achievement of targeted growth and operational objectives. The Company
    believes that this local management focus will provide a critical
    competitive edge in customer acquisition and retention in each market.
 
        FURTHER DEVELOP EFFECTIVE DIRECT SALES AND CUSTOMER CARE
    ORGANIZATIONS.  NEXTLINK is building a highly motivated and experienced
    direct sales force and customer care organization that is designed to
    establish a direct and personal relationship with its customers. The Company
    has expanded its sales force from 98 salespeople at year end 1996 to 150
    salespeople at June 30, 1997. The Company expects to further increase its
    sales force to approximately 200 salespeople by year end 1997. Salespeople
    are given incentives through a commission structure that targets 40% of a
    salesperson's compensation to be based on performance. To ensure customer
    satisfaction, each customer will have a single point of contact for customer
    care who is responsible for solving problems and responding to customer
    inquiries. The Company has expanded its customer care organization from 36
    customer care employees at year end 1996 to 81 customer care employees at
    June 30, 1997.
 
        CONTINUOUSLY IMPROVE PROVISIONING PROCESSES TO ACCELERATE REVENUE
    GROWTH.  The Company believes that the immediate challenge for CLECs will be
    developing effective provisioning systems, which include the complex process
    of transitioning ILEC customers to the Company's network. Accordingly, the
    Company has begun to identify and will focus, as a key competitive strategy,
    on implementing best provisioning practices in each of its markets that will
    provide for rapid and seamless transitions of customers from the ILEC to the
    Company. To support the provisioning of its services, the Company has begun
    the long-term development of a comprehensive information technology platform
    geared toward delivering information and automated ordering and provisioning
    capability directly to the end-user as well as to the Company's internal
    staff. The Company believes that these practices and its comprehensive
    information technology platform, as developed, will provide the Company with
    a long-term competitive advantage and allow it to implement more rapidly
    switched local services in its markets and to shorten the time between the
    receipt of a customer order and the generation of revenues.
 
        DEVELOP HIGH CAPACITY FIBER OPTIC NETWORKS WITH BROAD MARKET
    COVERAGE.  NEXTLINK has and intends to continue to approach network design
    with a long-term view focusing on three key
 
                                       31
<PAGE>
    elements. First, the Company designs and builds its networks to provide
    extensive coverage of those areas where the density of business lines is
    highest and to enable the Company to provide direct connections to a high
    percentage of commercial buildings and ILEC central offices situated near
    the network. Over time, this broad coverage is expected to result in a
    higher proportion of traffic that is both originated and terminated on the
    Company's networks, which should provide higher long-term operating margins.
    Second, the Company constructs high capacity networks that utilize large
    fiber bundles capable of carrying high volumes of voice, data, video and
    Internet traffic as well as other high bandwidth services. This strategy
    should reduce potential "overbuild" costs and provide added network capacity
    as the Company adds high bandwidth services in the future. In Atlanta,
    Chicago, New York and Newark, New Jersey, the Company will utilize leased
    dark fiber and fiber capacity to launch facilities-based services and begin
    building a customer base in advance of completing construction of its own
    fiber optic network in these markets. Third, the Company employs a uniform
    technology platform based on Nortel DMS 500 switches (ten of which are
    currently installed, including one switch that has been installed at the
    Company's testing and network operations control center, and an additional
    four of which are currently planned to be installed by the end of the first
    quarter of 1998), associated distribution technology and other common
    transmission technologies enabling the Company to (i) deploy features and
    functions quickly in all of its networks, (ii) expand switching capacity in
    a cost effective manner and (iii) lower maintenance costs through reduced
    training and spare parts requirements. The Company also utilizes unbundled
    loops from the ILEC to connect the Company's switch and network to end user
    buildings and is evaluating other alternatives for building connectivity,
    including wireless connections, for the "last mile" of transport.
 
        CONTINUE MARKET EXPANSION.  The Company's goal is to add or expand
    markets and market clusters to increase its addressable business lines to
    approximately 11 million by the end of 1998. The Company anticipates
    continuing to expand into new geographic areas, including additional large
    markets, as opportunities arise either through building new networks,
    acquiring existing networks or acquiring or leasing dark fiber and fiber
    capacity. NEXTLINK also believes that its strategy of operating its networks
    in clusters (i) offers substantial advantages including economies of scale
    in management, marketing, sales and network operations, (ii) enables the
    Company to capture a greater percentage of regional traffic and to develop
    regional pricing plans, because the Company believes that a significant
    level of traffic terminates within 300 miles of its origination and (iii)
    provides opportunities in smaller markets that are too small to develop on a
    stand alone basis.
 
        OFFER ENHANCED COMMUNICATIONS SERVICES.  NEXTLINK offers customers
    value-added services that are not dependent on the Company's local
    facilities. The Company believes that with these services it can establish a
    customer base in a market in advance of constructing network facilities as
    well as offer additional services in markets where the Company has
    constructed facilities. The Company plans to market its enhanced
    communications service offerings in all of its markets, as well as in areas
    of planned network expansion. This should increase the Company's visibility,
    develop customer relationships and assist the Company in attracting local
    exchange customers when it operates networks in these markets.
 
THE COMPANY'S TELECOMMUNICATIONS SERVICES
 
    LOCAL AND LONG DISTANCE SERVICES
 
    The Company commenced the offering of switched local and long distance
services in seven markets on July 4, 1996, in an eighth market on January 1,
1997, in three markets on April 30, 1997 and in 12 additional markets in July
1997. The Company expects to commence the offering of switched local and long
distance services in three additional markets by the end of 1997 and in four
additional markets in 1998. The Company focuses its product offering on basic
telecommunications services, which it believes are the core of local exchange
services. Pricing, which is determined and implemented by the
 
                                       32
<PAGE>
Company's operating subsidiary in each local market, has been generally 10% to
15% lower than the pricing for comparable local services from the ILEC. The
Company's current product offering includes:
 
    - Standard dial tone, including touch tone dialing, 911, and operator
      assisted calling;
 
    - Multi-trunk services, including direct inward dialing (DID) and direct
      outward dialing (DOD);
 
    - Long distance service, including 1+, 800/888 and operator services;
 
    - Voice messaging with personalized greetings, send, transfer, reply and
      remote retrieval capabilities; and
 
    - Directory listings and assistance.
 
    Currently, the Company offers CAP services in 23 markets, focusing on long
distance carriers and the private line needs of high volume customers. In
addition, data services that are currently offered by the Company include
Ethernet, TOKEN rings, and Fiber Distributed Data Interface (FDDI).
 
    The Company's CAP services, which are used as both primary and back-up
circuits, fall into three principal categories: (i) special access circuits that
connect end-users to long distance carriers; (ii) special access circuits that
connect long distance carriers' facilities to one another; and (iii) private
line circuits that connect several facilities owned by the same end-user.
 
    ENHANCED COMMUNICATIONS SERVICES
 
    NEXTLINK's IVR platform allows a consumer to dial into a computer-based
system using a toll-free number and a touch tone phone, and, by following a
customized menu, to access a variety of information and to leave simultaneously
a profile of the caller behind for use by either NEXTLINK or its clients.
Currently, NEXTLINK provides four types of IVR services:
 
    - LeaveWord--prompts the consumer to leave messages of any length or
      complexity, ranging from catalog requests and contest entries to specific
      product questions and surveys;
 
    - Dealer Locator--helps a consumer to locate the nearest dealer of the
      client's products by instantly identifying the consumer's area and
      responding with the names, addresses and phone numbers of the client's
      locations within any desired mileage radius;
 
    - Automated Order Entry--allows consumers to purchase products using the
      interactive phone service 24-hours a day, with real-time order and credit
      card confirmation as well as arranging for delivery of the new item to the
      consumer's desired address; and
 
    - Interactive Call Center--provides the consumer with a menu of selections
      that include Dealer Locator, Automated Order Entry and other functions,
      including receiving a catalog, registering the warranty of a product,
      contest entry and an option for callers to be forwarded to a live
      operator.
 
    NEXTLINK also provides a virtual communications center for mobile
professionals and workgroups through its Magic Number service, which offers a
suite of personal communications services. These services are made available
through a specialized personal telephone number. The key services provided by
this center are the following:
 
    - Follow-Me--instructs the communications center to forward any calls made
      to a Magic Number to a particular wireline or wireless telephone number;
 
    - Voice Messaging--allows subscribers to receive, send, keep, transfer,
      instantly reply to or request future delivery for voice messages;
 
    - Call-out--enables subscribers to make calls from the communications center
      without hanging up between calls or dialing another PIN number;
 
                                       33
<PAGE>
    - Paging--notifies subscribers via pager of new and urgent messages;
 
    - Caller ID--provides the ability to capture the telephone number of anyone
      who calls the subscriber, which is also displayed on the subscriber's
      pager;
 
    - Fax Messaging--stores an incoming fax and delivers it to the nearest fax
      machine designated by the subscriber when the subscriber calls in to
      retrieve it; and
 
    - Teleconferencing--handles all teleconferencing needs through a
      teleconferencing operator.
 
    The Company has developed its enhanced communications service offerings
through acquisitions, marketing agreements and equity investment. In June 1995,
the Company acquired certain enhanced communications services assets from City
Signal, Inc. These assets are used by the Company to offer its Magic Number
service. In September 1995, the Company acquired a fully operational interactive
voice response business through which the Company offers its IVR services. The
Company anticipates that it will continue to explore other enhanced
communications services opportunities and may acquire, invest in or establish
marketing relationships with, additional service providers in the future that
support its overall business and marketing strategies.
 
SALES AND CUSTOMER CARE
 
    OVERVIEW
 
    The Company utilizes a two-pronged sales strategy in each of its markets,
one directed to the sale of local and long distance services and the other to
enhanced communications services. The primary sales efforts in the Company's
markets are for switched local and long distance services focusing on small and
medium-sized businesses and professional groups with fewer than 50 business
lines. The Company's market research indicates that these customers prefer a
single source for all of their telecommunications requirements, including
products, billing, installation, maintenance and customer service. The Company
utilizes a direct sales effort offering combined local and long distance
services with prices that are generally at a 10% to 15% discount from the ILEC.
Providing a combination of local and long distance services provides the
Company's customers a level of convenience that has been generally unavailable
since the break-up of AT&T. The Company is also marketing its enhanced
communications services through a separate direct sales force in each market,
which is expected to increase the number of customers for all of NEXTLINK's
telecommunications services in that market at a faster rate. In addition, the
Company is continuing its sales efforts for traditional CAP services to long
distance carriers and large commercial users.
 
    SALES FORCE
 
    The Company is building a highly motivated and experienced direct sales
force and customer care organization that is designed to establish a direct and
personal relationship with its customers. The Company seeks to recruit
salespeople with strong sales backgrounds, including salespeople from long
distance companies, telecommunications equipment manufacturers, network systems
integrators and the ILECs. The Company has expanded its sales force from 98
salespeople at year end 1996 to 150 salespeople at June 30, 1997. The Company
expects to further increase its salesforce to approximately 200 salespeople by
year-end 1997. Salespeople are given incentives through a commission structure
that targets 40% of a salesperson's compensation to be based on performance.
With respect to traditional CAP services, the Company currently utilizes a
national sales force to establish and expand long distance company access
service sales. Sales efforts for long distance carriers are centralized in order
to provide a single point of contact for these customers.
 
    The Company anticipates that its enhanced communications service offerings
will continue to be sold across the country by its existing national sales force
for these services. The Company has also augmented these efforts with a
separate, targeted, locally based sales force in each of its markets. The
 
                                       34
<PAGE>
Company believes that this approach to each market will provide revenues that
are incremental to its local exchange operations.
 
    CUSTOMER CARE
 
    The Company is augmenting its direct sales approach with superior customer
care and support through locally based customer care representatives. The
Company is structuring its customer care organization in such a manner that each
customer will have a single point of contact for customer care who is
responsible for solving problems and responding to customer inquiries. The
Company has expanded its customer care organization from 36 customer care
employees at year-end 1996 to 81 customer care employees at June 30, 1997. The
Company seeks to provide a customer care group that has the ability and
resources to respond to and resolve customer problems as they arise. The Company
believes that customer care representatives will be the most effective if they
are based in the community in which the Company is offering services, which
placement will allow, among other things, the opportunity for the
representatives to visit the customer's location.
 
NETWORK DEVELOPMENT
 
    GENERAL
 
    In developing its networks, the Company has generally executed a strategy of
(i) acquiring fully or partially constructed fiber optic networks and (ii)
designing and constructing high capacity fiber optic networks with broad
coverage. The Company has recently entered into leased dark fiber and fiber
capacity arrangements, which allow the Company, by installing one or more
switches and related electronics, to enter a market prior to completing
construction of a fiber optic network. The Company regularly evaluates markets
as locations for expansion of the Company's current networks and the development
of additional networks. The decision to build, acquire or utilize capacity of an
existing network is not based on any single factor, but on a combination of a
number of factors including:
 
    - demographic, economic, telecommunications demand and business line
      characteristics of the market and the surrounding markets;
 
    - level of capital expenditures relative to the number of business lines;
 
    - availability of rights-of-way;
 
    - actual and potential competitors; and
 
    - potential for the Company to cluster additional networks in the region.
 
    If a particular market targeted for development is deemed to present an
attractive market opportunity, the Company determines whether acquisition
opportunities are available. In some cases a large network can be acquired, and
in other cases a small existing network can serve as a starting point for market
entry. If the Company decides to build a new network, or substantially expand a
small acquired system, the Company designs a proposed new or expanded network
that can connect a large number of businesses, long distance carriers points of
presence and the ILEC's principal central offices in the area to be served,
utilizing existing rights-of-way and/or rights-of-way that the Company will
develop. Concurrently, the Company's market development personnel visit the
location of the proposed network to begin discussions with city officials,
providers of rights-of-way, potential end-users and long distance companies.
 
    Based on the data developed during these preliminary studies and visits, the
Company develops detailed financial estimates of the costs of constructing a
network, including the cost of fiber optic cable, transmission and other
electronic equipment, as well as costs related to switching, engineering,
building entrance requirements and right-of-way acquisition. If the financial
estimates are satisfactory to the Company, the Company's market development
personnel prepare a detailed business and financial plan for the proposed
network, including competitive, regulatory and right-of-way analyses. Based upon
its review of these analyses the Company determines whether to proceed. The
Company anticipates continuing the expansion of its networks into new markets
utilizing the market development analysis described above. The Company will seek
to continue to expand its operations in states where it has
 
                                       35
<PAGE>
established one or more networks, by continuing to construct or acquire networks
in adjacent areas to leverage its existing networks, switches and
telecommunications equipment, thereby establishing a cost effective and
operationally efficient cluster of networks in various geographic regions.
 
    THE COMPANY'S NETWORKS
 
    The following table provides certain information on the Company's networks
that will have launched switched local and long distance services by December
1997.
 
<TABLE>
<CAPTION>
                                                                                           AS OF JUNE 30, 1997
                                                                               -------------------------------------------
<S>                                                  <C>                       <C>          <C>          <C>
                                                                                                              ON-NET
                                                     SWITCHED LOCAL SERVICES      ROUTE        FIBER         BUILDINGS
 STATE/MARKET                                             LAUNCH DATE(1)        MILES(2)     MILES(3)      CONNECTED(4)
- ---------------------------------------------------  ------------------------  -----------  -----------  -----------------
TENNESSEE..........................................                                   395       34,256             244
  Memphis..........................................             July 1996
  Nashville........................................             July 1996
PENNSYLVANIA.......................................                                   457       22,085              37
  Allentown........................................             July 1996
  Harrisburg.......................................             July 1996
  Lancaster........................................             July 1996
  Reading..........................................             July 1996
  Scranton/Wilkes Barre............................        September 1997
  Philadelphia.....................................             July 1997
WASHINGTON.........................................                                     2          230              21
  Spokane..........................................             July 1996
OHIO...............................................                                    65       12,826              11
  Cleveland........................................            April 1997
  Columbus.........................................            April 1997
  Akron............................................         December 1997
UTAH...............................................                                    93       12,998              49
  Salt Lake City...................................          January 1997
  Provo/Orem.......................................        September 1997
NEVADA.............................................                                   400       10,500              91
  Las Vegas........................................            April 1997
CALIFORNIA.........................................                                   183       24,569               6
  Los Angeles......................................             July 1997
  Anaheim..........................................             July 1997
  Costa Mesa.......................................             July 1997
  Garden Grove.....................................             July 1997
  Irvine...........................................             July 1997
  Orange...........................................             July 1997
  Santa Ana........................................             July 1997
  Long Beach.......................................             July 1997
  Inglewood........................................             July 1997
  Huntington Beach.................................             July 1997
  Fullerton........................................             July 1997
                                                                               -----------  -----------         ------
      Total........................................                                 1,595      117,464             459
                                                                               -----------  -----------         ------
                                                                               -----------  -----------         ------
</TABLE>
 
- ------------------------
(1) Actual/Anticipated launch date of switched local services.
(2) Route miles refers to the number of miles of the telecommunications path in
    which the Company-owned or leased fiber optic cables are installed.
(3) Fiber miles refers to the number of route miles installed along a
    telecommunications path, multiplied by the Company's estimate of the number
    of fibers along that path.
(4) Represents buildings physically connected to the Company's networks,
    excluding those connected by unbundled facilities. As of June 30, 1997, the
    Company had 1,284 buildings physically connected to its networks, including
    those buildings connected through unbundled facilities.
 
    The following table sets forth the location of the markets in which the
Company currently plans to launch switched local and long distance services
during 1998.
 
<TABLE>
<CAPTION>
                                                                                       LOCAL SWITCHED
STATE                                 MARKET                                        SERVICES LAUNCH DATE
- ------------------------------------  ------------------------------------  ------------------------------------
<S>                                   <C>                                   <C>
Illinois............................  Chicago                               First Quarter 1998
New York............................  New York City                         Second Quarter 1998
New Jersey..........................  Newark                                Third Quarter 1998
Georgia.............................  Atlanta                               Fourth Quarter 1998
</TABLE>
 
    TENNESSEE.  In January 1995, the Company acquired from City Signal, Inc. an
extensive, fully operational network in Memphis, Tennessee and another network
then under development in Nashville, Tennessee. Since the date of acquisition,
the Memphis network has provided dedicated private line
 
                                       36
<PAGE>
services, long distance carrier access services, high speed data transmission,
and video conferencing and, beginning in July 1996, switched local and long
distance services. In Nashville, the initial backbone network was completed in
December 1995, and the Company also began providing local and long distance
services to customers in this area in July 1996. The Company has continued to
expand the networks in Nashville and Memphis over the past year.
 
    PENNSYLVANIA.  In April 1995, the Company began construction of an extensive
regional fiber optic network connecting Harrisburg, Reading, Lancaster, and
Allentown, Pennsylvania. The backbone network connecting these four areas and
covering 21 counties was completed in the first quarter of 1996. The Company
believes that this network provides it with the foundation for significant
regional service offerings. The Company commenced offering switched local
services to customers utilizing its Pennsylvania networks in July 1996. The
Company recently completed extensions of the network to the Scranton/Wilkes
Barre market and downtown Philadelphia. In June 1997, the Company executed a
definitive agreement to acquire an existing fiber optic network in downtown
Philadelphia in order to extend its existing network in Pennsylvania. The
acquisition is subject to regulatory and other consents and is anticipated to be
consummated by the end of 1997. During the interim period prior to closing, the
Company is operating under a 36 fiber capacity agreement with the seller. In
June 1997, the Company also entered into an eight year exclusive agreement with
a company which has excess fiber capacity in Philadelphia, which it agreed to
make available to the Company at a substantial discount. This additional
capacity will allow the Company to expand its operations in Philadelphia by
utilizing the excess capacity to reach customers throughout Philadelphia. The
Company launched the offering of switched local and long distance services to
its customers in downtown Philadelphia in July 1997 and anticipates launching
the offering of these services in Scranton/Wilkes Barre in September 1997.
 
    WASHINGTON.  In April 1995, the Company acquired a local exchange service
reseller located in Spokane, Washington. The Company installed a switch in early
1996 and began providing switched local services in July 1996. Since that time,
the Company has constructed a fiber optic ring in the downtown area and is
continuing new construction there. The Company currently serves approximately
9,200 business lines, including those lines which are provided through resale of
Centrex services. The Company is in the process of migrating its current resale
customers to the fiber optic network as portions of that network are completed.
 
    OHIO.  In January 1996, the Company acquired existing fiber optic networks
and switching facilities in the downtown business centers of Cleveland, Columbus
and Akron, Ohio. The Company has expanded the networks in Cleveland and Columbus
and replaced the switches that were acquired in these markets with two Nortel
DMS 500 switches, the Company's standard switching platform. The Company began
offering switched local and long distance services in Cleveland and Columbus in
April 1997 and anticipates that it will begin offering these services in Akron
during the fourth quarter of 1997.
 
    UTAH.  In March 1996, the Company admitted a 10% member to the subsidiary
conducting the Company's operations in Utah, which member provided access to its
rights-of-way, franchises, and other valuable services in order for the Company
to commence the construction of a fiber optic network in Salt Lake City and the
Wasatch Valley, which the Company believes is among the fastest growing areas in
the United States. Construction of the downtown fiber optic ring began in the
second quarter of 1996. The switching facilities were installed during the
fourth quarter of 1996 with switched local and long distance service starting
January 1, 1997. The Company is in the process of completing the expansion of
this network to Provo and Orem and expects to begin providing switched local and
long distance services in the Provo and Orem areas by September 1997.
 
    NEVADA.  In April 1996, the Company became a 40% member in, and manager of,
a joint venture that provides local telecommunications services in Las Vegas,
which the Company believes is one of the fastest growing areas in the United
States. The Company has provided a license to the joint venture to
 
                                       37
<PAGE>
operate under the name NEXTLINK Nevada. The joint venture began providing
switched local and long distance services in April 1997 in addition to the
competitive access services that were previously provided over a fiber optic
network covering approximately 400 route miles throughout Las Vegas. The Company
will provide strategic planning and management of the business for a ten year
period through one of its subsidiaries.
 
    CALIFORNIA.  On February 4, 1997, the Company acquired substantially all the
assets of Linkatel, a Los Angeles-based competitive access telecommunications
provider. At the time of the acquisition, Linkatel operated an 80-mile fiber
optic telecommunications network covering several markets from the downtown Los
Angeles area to the City of Irvine in Orange County. The Los Angeles/Orange
County area represents one of the largest telecommunications markets in the
United States, with over 2 million addressable business lines. The Company
assumed management of this operation in November 1996. As part of the assets
acquired, the Company obtained access to approximately 250 route miles of right-
of-way, of which 183 miles have been completed, creating one network in Los
Angeles and one network in the Orange County area. Over these networks, the
Company began providing competitive access services and launched switched local
and long distance services in July 1997.
 
    ILLINOIS, NEW YORK, NEW JERSEY AND GEORGIA.  In June 1997, the Company
entered into an eight year exclusive agreement, which contains a five year
renewal option, with a company that has excess fiber capacity in each of
Atlanta, Chicago, New York, and Newark, New Jersey, which it agreed to make
available to the Company in each of those markets at a substantial discount to
the wholesale rates charged by other vendors of fiber capacity. This capacity
will allow the Company to accelerate its entry into each of these markets by
enabling the Company to avoid a significant portion of the infrastructure
development and construction time that would otherwise be required to launch
switched local and long distance services in these markets.
 
        CHICAGO.  The Company anticipates launching switched local and long
    distance services in Chicago in the first quarter of 1998. In addition to
    establishing the capacity arrangement for Chicago described above, the
    Company has located and anticipates commencing installation of its first
    switch for Chicago in the third quarter of 1997. The Company also has
    received its CLEC certification from the Illinois Corporation Commission, is
    in negotiations with Ameritech Illinois for interconnection of services and
    is negotiating with the City of Chicago for a franchise.
 
        NEW YORK.  The Company anticipates launching switched local and long
    distance services in Manhattan in the second quarter of 1998. The Company
    has applied for its CLEC authority from the New York State Public Service
    Commission, is in negotiations with NYNEX Corporation for interconnection,
    and is engaged in negotiations with New York City for a franchise. In
    addition to the capacity arrangement described above, the Company also has
    entered into a 20-year lease of 1,692 fiber miles over an existing 47-mile
    fiber network, which extends from the Wall Street area north to midtown
    Manhattan.
 
        NEWARK, NEW JERSEY AND ATLANTA.  The Company is in the process of
    commencing its development activities in Newark, New Jersey, and Atlanta,
    and anticipates completing the necessary regulatory applications and
    beginning interconnection and franchise negotiations in the third quarter of
    1997, with an anticipated launch of services in Newark in the third quarter
    of 1998 and Atlanta in the fourth quarter of 1998.
 
NETWORK ARCHITECTURE
 
    DESIGN
 
    The Company builds or acquires its own fiber optic networks because it
believes that facilities-based full service telecommunications companies whose
networks are directly connected to their customers will have the ability to
respond more quickly to customer needs for capacity and services.
 
                                       38
<PAGE>
Moreover, the Company believes that facilities-based carriers develop a more
knowledgeable, cooperative relationship with their customers, improving their
ability to provide new services and other telecommunications solutions, which
should result in higher long-term operating margins.
 
    The Company believes that the future telecommunications market will be an
interconnected network of networks. The Company believes that calls will flow
between local networks, with customers selecting their service provider based on
high quality and differentiated products, responsive customer service and price.
In some circumstances, depending in part upon regulatory conditions, the Company
will utilize its own network for one portion of a call and resell the services
of another carrier for the remaining portion of a call. In other instances, both
the origination and termination of calls will take place on the Company's
networks. The Company's networks are designed to maximize connectivity directly
with significant numbers of business end-users, and to easily interconnect and
provide a least-cost routing flow of traffic between the Company's network and
other networks in the marketplace.
 
    In general, the Company seeks to build wide, expansive networks, rather than
a simple core ring in a downtown metropolitan area. The Company believes that
this type of broad coverage of the markets in which it operates will result in
the following advantages:
 
    - an increased number of buildings that can be directly connected to the
      Company's network, which should maximize the number of businesses to which
      the Company can offer its services;
 
    - a higher volume of telecommunications traffic both originating and
      terminating on the Company's network, which should result in improved
      operating margins;
 
    - the ability to leverage its investment in high capacity switching
      equipment and electronics; and
 
    - the opportunity for the Company's network to provide backhaul carriage for
      other telecommunications service providers such as long distance and
      wireless carriers.
 
    The Company seeks to further utilize this network design to increase the
number of buildings and customers directly connected to its networks. The
Company believes that as compared to the extensive use of unbundled loops and
pursuing a pure resale business strategy, having a direct connection to its
customers will provide the Company with the highest long-term operating margins,
allow the Company to provide greater feature and quality control as well as
offer customer service that is both prompt and effective, because the network to
be serviced is controlled by the Company and not another service provider.
 
    The Company seeks to build high capacity networks using a backbone density
ranging between 72 and 240 strands. A single pair of glass fibers on the
Company's networks can currently transmit 32,256 simultaneous voice
conversations, whereas a typical pair of copper wires can currently carry a
maximum of 24 digitized simultaneous voice conversations. The Company believes
that installing high count fiber strands will allow the Company to offer a
higher volume of voice and broadband services without incurring significant
additional construction costs.
 
                                       39
<PAGE>
    The following diagram illustrates NEXTLINK's network design.
 
                   [Graphic depicting the Company's Network.]
 
    CONSTRUCTION
 
    The construction period of a new network varies depending upon the scope of
the activities, such as the number of backbone route miles to be installed,
whether the construction is underground or aerial, whether the conduit is in
place or requires construction, the initial number of buildings targeted for
connection to the network backbone and the general configuration for its
deployment. After installing the network backbone, the Company evaluates
extensions to additional buildings and expansions to other areas of a market,
based on detailed assessments of market potential.
 
    The Company's network backbones are installed in conduits that are either
owned by the Company or leased from third parties. The Company leases conduit or
pole space from entities such as utilities, railroads, long distance carriers,
state highway authorities, local governments and transit authorities. These
arrangements are generally for multi-year terms with renewal options, and are
nonexclusive. The availability of these arrangements is an important part of the
Company's evaluation of a market. Cancellation of any of the Company's material
right-of-way agreements could have an adverse effect on the Company's business
in that area and could have a material adverse effect on the Company.
 
    Office buildings are connected primarily by network backbone extensions to
one of a number of physical rings of fiber optic cable, which originate and
terminate at the Company's central node. Alternatively, the Company may access
an end-user's location through interconnection with the ILEC's central office.
The Company is also evaluating other alternatives for building connectivity,
including wireless connections, for the "last mile" of transport. Signals are
generally sent through a network backbone to the central node simultaneously on
both primary and alternate protection paths. Most buildings served have a
discrete Company presence (referred to as a "remote hub") located in the
building. Within each building, Company-owned internal wiring connects the
remote hub to the customer premises. Customer equipment is connected to
Company-provided electronic equipment generally located in the remote hub, where
customer transmissions are digitized, combined and converted to an optical
signal. The traffic is then transmitted through the network backbone to the
Company's central node where originating traffic is reconfigured for routing to
its ultimate destination. After completion of network construction, the Company
employs maintenance and line crews that are responsible for responding to
outages and routine maintenance of the network.
 
    UNIFORM TECHNOLOGY PLATFORM
 
    The Company is implementing a consistent technology platform based on the
Nortel DMS 500 switch throughout its networks. Unlike a traditional long
distance or local switch, the Nortel DMS 500 switch will enable the Company to
provide local and long distance services from a single platform. The Company
believes that having a standardized switch platform will enable it to (i) deploy
features and functions quickly in all of its networks, (ii) expand switch
capacity in a cost effective manner and (iii) lower maintenance costs through
reduced training and spare parts requirements. In addition, the scalability and
capacity of these switches will allow the Company to switch calls from more than
one market, which enhances the Company's ability to use a clustered approach to
the building of its networks.
 
    The Company also is establishing a uniform transmission technology utilizing
SONET design and standardized digital access and cross connect systems ("DACCS")
and other ancillary transmission equipment. DACCS provide the ability to
aggregate and disaggregate capacity along the fiber optic network. Using the
DACCS, the capacity of 24 DS-0s can be aggregated to form a DS-1 and, again
through the DACCS, 28 DS-1s can be aggregated to form a DS-3.
 
                                       40
<PAGE>
    The Company's NEXTLAB facility contains a fully functional Nortel DMS 500
switch in a configuration that simulates the working environment of the
Company's operational switches as well as distribution and ancillary equipment.
Located in Plano, Texas, NEXTLAB operates separate and apart from the Company's
operational switches as a testing facility and will serve as the Company's
network operations control center (NOCC). NEXTLAB provides the Company with a
means to test switch software and service configurations prior to their release
on the Company's networks. The Company believes that this process should: (i)
minimize network outages; (ii) save network operating and training costs; and
(iii) improve levels of customer service.
 
IMPLEMENTATION OF LOCAL TELECOMMUNICATIONS
 
    A company preparing to offer local exchange services not only requires an
installed switch, but also must have numerous network and routing arrangements
in place. NEXTLINK has established all of these arrangements for Pennsylvania,
Tennessee, Washington, Utah, Ohio, Nevada and California. These key elements
include:
 
    INTERCONNECTION.  The Company has executed interconnection agreements for
all of its current operating networks: in Nashville and Memphis, Tennessee, with
BellSouth Telecommunications, Inc.; in Harrisburg, Reading, Lancaster and
Allentown, Pennsylvania, with Bell Atlantic-Pennsylvania, Inc.; in Cleveland and
Columbus, Ohio with a division of Ameritech; in Spokane, Washington, and Salt
Lake City and Provo/Orem, Utah with U S WEST Communications, Inc.; in Los
Angeles, California and the surrounding markets, with Pacific Bell and GTE
Corporation; and in Las Vegas, Nevada with a division of Sprint. The Company is
currently negotiating interconnection agreements with NYNEX Corporation for New
York and Ameritech for Chicago, and plans to begin negotiations with BellSouth
for an interconnection agreement to cover Atlanta by the end of the third
quarter of 1997. In addition, the Company believes that interconnection
arrangements between the ILECs and other CLECs or the Company will be in place
in other markets that the Company may enter. The Company likely will initially
"piggy-back" on these other arrangements while pursuing more favorable long-term
arrangements.
 
    The Company's approach to interconnection has been a two-step process. To
accelerate its launch of switched local services, the Company has entered into
initial interconnection arrangements that allow for the immediate exchange of
local traffic with the ILEC. These arrangements allow the Company to commence
service immediately and then work to optimize its arrangements with the ILEC.
The Company's ILEC agreements are now being re-negotiated under Sections 251 and
252 of the Telecom Act. The actual operating experience gained through the
Company's initial interconnection agreements gives the Company critical
knowledge for negotiating longer term arrangements. In some cases, where
agreement on a long-term arrangement cannot be reached, the Company may pursue
binding arbitration before the state utility commissions as provided under the
Telecom Act. There can be no assurance, however, that the Company will be able
to negotiate longer term relationships on terms and conditions satisfactory to
the Company.
 
    TELEPHONE NUMBERS.  The Company has been offered interim number portability
arrangements by the ILEC in each of its markets, and the Company also is engaged
in industry negotiations to establish permanent number portability. Number
portability arrangements will allow ILEC customers to retain their telephone
numbers when changing local exchange service carriers. In addition, the Company
has been allocated multiple blocks of 10,000 telephone numbers for each of its
Tennessee, Washington, Pennsylvania, Ohio, Utah, Nevada and California networks
for use in assigning new numbers to its customers. These numbers, known as NXX
numbers, are the first three digits of a customer's seven digit local phone
number. In each of these cases, the NXX is fully loaded into the Local Exchange
Routing Guide or LERG, which instructs ILECs and other carriers to send a call
using a NEXTLINK NXX to the appropriate NEXTLINK switch, for delivery to the
NEXTLINK customer.
 
                                       41
<PAGE>
    SS7 POINT CODES.  For each of the Company's switches, the Company has been
assigned Point Codes for use with the advanced signaling system known as SS7
which is a separate or "out of band" communications channel used between
telecommunications carriers to set up and control traffic on and between
networks. The Company has designed its network to fully utilize SS7 signaling,
which improves call processing times and frees capacity for voice, data, and
video transmissions. The Company has entered into an agreement with a national
SS7 service provider that will allow the Company to utilize SS7 signaling in its
current and new markets nationwide.
 
REGULATORY OVERVIEW
 
    OVERVIEW
 
    The Company's services are subject to varying degrees of federal, state and
local regulation. The FCC generally exercises jurisdiction over the facilities
of, and services offered by, telecommunications common carriers that provide
interstate or international communications. The state regulatory commissions
retain jurisdiction over the same facilities and services to the extent they are
used to provide intrastate communications. Local governments sometimes impose
franchise or licensing requirements on local exchange and other carriers and
regulate street opening and construction activities.
 
    The Telecom Act imposes on ILECs certain interconnection obligations that,
taken together, grant competitive entrants such as the Company what is commonly
referred to as "co-carrier status." In addition, the Telecom Act generally
preempts state or local legal requirements that prohibit or have the effect of
prohibiting any entity from providing telecommunications service. The Telecom
Act allows state regulatory authorities to continue to impose competitively
neutral requirements designed to promote universal service, protect public
safety and welfare, maintain quality of service and safeguard the rights of
consumers. The Telecom Act also preserves the ability of state and local
authorities to manage and require compensation for the use of public
rights-of-way by telecommunications providers including competitors of the ILECs
in the local market.
 
    It is anticipated that co-carrier status and the preemption of state and
local prohibitions on entry could permit the Company to become a full service
provider of switched telecommunications services anywhere in the United States.
The following table summarizes the interconnection rights granted by the Telecom
Act that are most important to the achievement of this goal and the Company's
belief as to the anticipated effect of the new requirements, if properly
implemented.
 
                                       42
<PAGE>
 
<TABLE>
<CAPTION>
        ISSUE                           DEFINITION                                ANTICIPATED EFFECT
- ---------------------  --------------------------------------------  --------------------------------------------
<S>                    <C>                                           <C>
Interconnection        Efficient network interconnection to          Allows a CLEC to service and terminate calls
                       transfer calls back and forth between ILECs   to and from customers connected to other
                       and competitive networks (including 911, 0+,  networks
                       directory assistance, etc.)
 
Local Loop             Allows competitors to selectively gain        Reduces the capital and operating costs of a
  Unbundling           access to ILEC wires which connect ILEC       CLEC to serve customers not directly
                       central offices with customer premises        connected to its networks
 
Reciprocal             Mandates reciprocal compensation for local    Improves the CLEC's margins for local
  Compensation         traffic exchanges between ILECs and           service
                       competitors
 
Number Portability     Allows customers to change local carriers     Allows customers to switch to a CLEC's local
                       without changing numbers; true portability    service without changing phone numbers
                       allows incoming calls to be routed directly
                       to a competitor. Interim portability allows
                       incoming calls to be routed through the ILEC
                       to a competitor at the economic equivalent
                       of true portability
 
Access to Phone        Mandates assignment of new telephone numbers  Allows CLECs to provide telephone numbers to
  Numbers              to competitive telecommunications provider's  new customers on the same basis as the ILEC
                       customers
</TABLE>
 
    While the interconnection rights established in the Telecom Act are a
necessary prerequisite to the introduction of full local competition, they must
be properly implemented to be effective. Significant implementation issues
remain to be resolved, including modifications to, and expansion of, the ILEC
network interface facilities, before the barriers to entry into the local
telephone business are sufficiently lowered to permit widespread competitive
entry. See "Federal Legislation" for a more complete explanation of the
potential effect of the Telecom Act on the Company's business.
 
    FEDERAL LEGISLATION
 
    The Telecom Act, enacted on February 8, 1996, substantially revised the
Communications Act of 1934. The Telecom Act establishes a regulatory framework
for the introduction of local competition throughout the United States. Among
other things, the Telecom Act preempts any state or local government from
prohibiting any entity from providing telecommunications service. This provision
eliminated prohibitions on entry found in almost half of the states in the
country at the time the Telecom Act was passed.
 
    The Telecom Act also establishes a dual federal-state regulatory scheme for
eliminating other barriers to competition faced by competitors to the ILECs and
other new entrants into the local telephone market. Specifically, the Telecom
Act imposes on ILECs certain interconnection obligations, some of which are to
be implemented by FCC regulations. The Telecom Act contemplates that states will
apply the federal regulations and oversee the implementation of all aspects of
interconnection not subject to FCC jurisdiction as they oversee interconnection
negotiations between ILECs and their new competitors.
 
    The FCC has significant responsibility in the manner in which the Telecom
Act will be implemented especially in the areas of universal service, access
charges and price caps. The details of the rules adopted by the FCC will have a
significant effect in determining the extent to which barriers to
 
                                       43
<PAGE>
competition in local services are removed, as well as the time frame within
which such barriers are eliminated. The FCC may also grant ILECs increased
pricing flexibility to enable them to respond to competition for special access
and private line services. To the extent such pricing flexibility is granted,
the Company's ability to compete for certain services may be adversely affected.
 
    The state PUCs have an even more significant responsibility in implementing
the Telecom Act. Specifically, the states have authority to establish
interconnection pricing, including unbundled loop charges, reciprocal
compensation and wholesale pricing. The states are also charged under the
Telecom Act with overseeing the arbitration process for resolving
interconnection negotiation disputes between CLECs and the ILECs.
 
    In addition, the Telecom Act provides that ILECs that are subsidiaries of
RBOCs cannot combine in-region, long distance services across local access and
transport areas ("LATAs") with the local services they offer until they have
demonstrated that (i) they have entered into an approved interconnection
agreement with a facilities-based CLEC or that no such CLEC has requested
interconnection as of a statutorily determined deadline, (ii) they have
satisfied a 14-element checklist designed to ensure that the ILEC is offering
access and interconnection to all local exchange carriers on competitive terms
and (iii) the FCC has determined that in-region, interLATA approval is
consistent with the public interest, convenience and necessity.
 
    FEDERAL REGULATION
 
    The FCC was granted authority to eliminate tariff and reporting requirements
for non-dominant carriers such as the Company. Acting under that authority, the
FCC has eliminated tariff filing requirements for such carriers providing
interstate access and domestic interstate long distance services. On February
13, 1997, the United States Court of Appeals for the District of Columbia
granted motions for stay of the FCC order detariffing domestic interstate long
distance service pending judicial review of that order. The result of this stay
is that carriers must continue to file tariffs for interstate long distance
services. Regulatory compliance measures remain in place for international
traffic. In addition, the Telecom Act now requires that ILECs provide CLECs with
physical collocation on rates, terms and conditions that are just and
reasonable, unless the ILEC can demonstrate to state regulators that physical
collocation is not practical. The Company believes that either physical or
virtual collocation of its facilities in a timely fashion for appropriate rates
and terms will accommodate its purposes.
 
    The FCC has taken several actions related to the assignment of telephone
numbers, first in July 1995 mandating that over the course of the next year
responsibility for administering and assigning local telephone numbers be
transferred from the RBOCs and a few other ILECs to a neutral entity, and second
in July 1996 adopting a regulatory structure under which a wide range of number
portability issues would be resolved. In March 1997, the FCC affirmed its number
portability rules, but it extended slightly certain deadlines for the
implementation of true number portability. The FCC plans to establish cost
recovery rules for true number portability.
 
    On August 8, 1996, the FCC issued an order containing rules providing
guidance to the ILECs, CLECs, long distance companies and state PUCs regarding
several provisions of the Telecom Act. The rules include, among other things,
FCC guidance on: (i) discounts for end-to-end resale of ILEC local exchange
services (which the FCC has suggested should be in the range of 17%-25%); (ii)
availability of unbundled local loops and other unbundled ILEC network elements;
(iii) the use of Total Element Long Run Incremental Costs ("TELRIC") in the
pricing of these unbundled network elements; (iv) average default proxy prices
for unbundled local loops in each state; (v) mutual compensation proxy rates for
termination of ILEC/CLEC local calls; and (vi) the ability of CLECs and other
interconnectors to opt into portions of interconnection agreements negotiated by
the ILECs with other parties on a most favored nation (or a "pick and choose")
basis. See below for a discussion of the Eighth Circuit Court of Appeals
decision invalidating certain aspects of this order.
 
                                       44
<PAGE>
    On May 8, 1997, the FCC released an order establishing a significantly
expanded federal telecommunications subsidy regime. For example, the FCC
established new subsidies for services provided to qualifying schools and
libraries with an annual cap of $2.25 billion and for services provided to rural
health care providers with an annual cap of $400 million. The FCC also expanded
the federal subsidies to low-income consumers. Providers of interstate
telecommunications service, such as the Company, as well as certain other
entities, must pay for these programs. The Company's share of the schools,
libraries and rural health care funds will be based on its share of the total
industry telecommunications service and certain defined telecommunications end
user revenues. The Company's share of all other federal subsidy funds will be
based on its share of the total interstate telecommunications service and
certain defined telecommunications end user revenues. Although the FCC order
describes a method for determining the amount the Company must contribute to
support these subsidies, the Company is currently unable to quantify the amount
of these payments that it will be required to make, and the effect that these
required payments will have on its financial condition. In the May 8 order, the
FCC also announced that it will soon revise its rules for subsidizing service
provided to consumers in high cost areas. Several parties have appealed the May
8 order. Such appeals have been consolidated and transferred to the United
States Court of Appeals for the Fifth Circuit where they are currently pending.
In addition, on July 3, 1997, several ILECs filed a petition for stay of the May
8 order with the FCC. That petition is also pending.
 
    In a combined Report and Order and Notice of Proposed Rulemaking released on
December 24, 1996, the FCC made changes and proposed further changes in the
interstate access charge structure. In the Report and Order, the FCC removed
restrictions on ILECs' ability to lower access prices and relaxed the regulation
of new switched access services in those markets where there are other providers
of access services. If this increased pricing flexibility is not effectively
monitored by federal regulators, it could have a material adverse effect on the
Company's ability to compete in providing interstate access services. On May 16,
1997, the FCC released an order revising its access charge rate structure. The
new rules substantially increase the costs that ILECs subject to the FCC's price
cap rules ("price cap LECs") recover through monthly, non-traffic sensitive
access charges and substantially decrease the costs that price cap LECs recover
through traffic sensitive access charges. In the May 16 order, the FCC also
announced its plan to bring interstate access rate levels more in line with
cost. The plan will include rules to be established sometime this year that
grant price cap LECs increased pricing flexibility upon demonstrations of
increased competition (or potential competition) in relevant markets. The manner
in which the FCC implements this approach to lowering access charge levels will
have a material effect on the Company's ability to compete in providing
interstate access services. Several parties have appealed the May 16 order.
Those appeals have been consolidated and transferred to the United States Court
of Appeals for the Eighth Circuit where they are currently pending.
 
    As part of its overall plan to lower interstate access rates, the FCC also
released an order on May 21, 1997, in which the FCC revised its price cap rules.
In the order, the FCC increased the so-called X-Factor (the percentage by which
price cap LECs must lower their interstate access charges every year, net of
inflation and exogenous cost increases) and made it uniform for all price cap
LECs. The results of these rule changes will be both a one-time overall
reduction in price cap ILEC interstate access charges and an increase in the
rate at which those charges will be reduced in the future. Several parties have
appealed the May 21 order. Those appeals have been consolidated and transferred
to the United States Court of Appeals for the Tenth Circuit where they are
currently pending.
 
    On January 2, 1997, Ameritech of Michigan became the first RBOC to apply for
authority to provide in-region interLATA service. Ameritech withdrew its
application on February 11, 1997, after the FCC struck from the record the
interconnection agreement between Ameritech and AT&T which formed the basis for
the application. On May 21, 1997, Ameritech refiled its application for
in-region interLATA authority in Michigan. That application is currently
pending. The Department of Justice has recommended that Ameritech of Michigan
not be granted authority to offer in-region interLATA services.
 
                                       45
<PAGE>
    On April 11, 1997, SBC applied to the FCC for authority to provide in-region
interLATA service in the state of Oklahoma. On June 26, 1997, the FCC released
an order rejecting SBC's application on the grounds that SBC had not
demonstrated either that SBC had entered into an approved interconnection
agreement with a facilities-based CLEC or that no CLEC had requested
interconnection as of the statutory deadline. On July 3, 1997, SBC filed an
appeal of the June 26 order with the United States Court of Appeals for the
District of Columbia. That appeal is currently pending.
 
    On July 2, 1997, SBC and its local exchange carrier subsidiaries filed a
lawsuit in the United States District Court for the Northern District of Texas
challenging on Constitutional grounds the Telecom Act restrictions applicable to
the RBOCs only. The plaintiffs in the case seek both a declaratory judgment and
an injunction against the enforcement of the challenged provisions.
 
    The Company anticipates that the FCC will initiate a number of additional
proceedings, of its own volition and as a result of requests from CLECs and
others, as a result of the Telecom Act. While the Eighth Circuit's recent
decision in the appeal of the August 8, 1996 order limits the FCC's jurisdiction
over the local competition provisions of the Telecom Act, such proceedings may
nonetheless further define and construe the Telecom Act's terms.
 
    COURT OF APPEALS DECISION
 
    Various parties, including ILECs and state PUCs, filed appeals of the FCC's
August 8, 1996 order in various U.S. Courts of Appeal, and several parties
petitioned the FCC and the courts to stay the effectiveness of the FCC's rules
included in the FCC's order, pending a ruling on the appeals. Many of the
appeals were consolidated and transferred to the U.S. Court of Appeals for the
Eight Circuit. On October 15, 1996, the Eighth Circuit issued a partial stay of
the FCC's rules until the full appeal on the FCC's rules could be heard. The
stay was limited to two areas of the FCC's rules: (1) the pricing rules other
than those dealing with commercial mobile radio service providers; and (2) the
CLECs' ability to utilize a most favored nation procedure to select favorable
provisions from other interconnectors' agreements.
 
    On July 18, 1997, the Eighth Circuit overturned the pricing rules
established in the August 8, 1996 order, except those applicable to commercial
mobile radio service providers. The Eighth Circuit held that, in general, the
FCC does not have jurisdiction over prices for interconnection, resale, leased
unbundled network elements and traffic termination. The Eighth Circuit also
overturned the FCC's "pick and choose" rules as well as certain other FCC rules
implementing the Telecom Act's local competition provisions. In addition, the
Eighth Circuit decision substantially limits the FCC's authority to enforce the
local competition provisions of the Telecom Act. The FCC has indicated that it
will seek Supreme Court review of the decision.
 
    In the short term the Company believes that the Eighth Circuit decision will
not have a material adverse effect on it, because the Company already has
interconnection agreements in place, or expects to have such agreements in
place, under the provisions of the FCC's order and the Telecom Act which were
not invalidated by the Court. The decision does not delay the implementation of
the Telecom Act by the parties and by the state PUCs, but rather eliminates the
guidance on pricing and most favored nation procedures as well as other issues
that the FCC sought to provide to the parties and the state PUCs.
 
    In the long term, the Eighth Circuit's decision makes it more likely that
the rules governing local competition will vary from state to state. Most states
have already begun to establish rules for local competition that are consistent
with the FCC rules overturned by the Eighth Circuit. If a patchwork of state
regulations were to develop, it could increase the Company's costs of regulatory
compliance and could make competitive entry in some markets more difficult and
expensive than in others.
 
                                       46
<PAGE>
    STATE REGULATION
 
    The Company expects that as it offers local exchange and other intrastate
services in an increasing number of states, it will be subject to direct state
PUC regulation in most if not all such states. In all states where the Company
is operational and certification as a CLEC is currently required, the Company's
operating subsidiaries are certificated.
 
    In most states, the Company is required to file tariffs or price lists
setting forth the terms, conditions and prices for services which are classified
as intrastate. In some states, the Company's tariff can list a range of prices
for particular services, and in others, such prices can be set on an individual
customer basis. The Company is not subject to price cap or to rate of return
regulation in any state in which it currently provides services.
 
    As noted above, as a result of the July 18, 1997 Eighth Circuit decision,
the states have the primary regulatory role under the Telecom Act. The Telecom
Act allows state regulatory authorities to continue to impose competitively
neutral requirements designed to promote universal service, protect public
safety and welfare, maintain quality of service and safeguard the rights of
consumers. State PUCs will implement and enforce most of the Telecom Act's local
competition provisions, including those governing the specific charges for local
network interconnection. In some states, those charges are being determined by
generic cost proceedings and in other states they are being established through
arbitration proceedings.
 
    LOCAL GOVERNMENT AUTHORIZATIONS
 
    In certain locations, the Company is required to obtain local franchises,
licenses or other operating rights and street opening and construction permits
to install, expand and operate its fiber optic networks. In some of the areas
where the Company provides network services, the Company's subsidiaries pay
license or franchise fees based on a percentage of gross revenues or on a per
linear foot basis. There is no assurance that certain cities that do not
currently impose fees will not seek to impose such fees in the future, nor is
there any assurance that, following the expiration of existing franchises, fees
will remain at their current levels. Under the Telecom Act, state and local
governments retain the right to manage the public rights-of-way and to require
fair and reasonable compensation from telecommunications providers, on a
competitively neutral and nondiscriminatory basis, for use of public
rights-of-way.
 
    If any of the Company's existing franchise or license agreements were
terminated prior to its expiration date and the Company were forced to remove
its fiber from the streets or abandon its network in place, such termination
would have a material adverse effect on the Company's subsidiary in that area
and could have a material adverse effect on the Company. The Company believes
that the provisions of the Telecom Act barring state and local requirements that
prohibit or have the effect of prohibiting any entity from providing
telecommunications service should be construed to limit any such action.
However, there can be no assurance that one or more local authorities will not
attempt to take such action. Nor is it clear that the Company would prevail in
any judicial or regulatory proceeding to resolve such a dispute.
 
COMPETITION
 
    As noted above, the regulatory environment in which the Company operates is
changing rapidly. The passage of the Telecom Act combined with other actions by
the FCC and state regulatory authorities continues to promote competition in the
provision of telecommunications services.
 
    ILECS
 
    In each market served by its networks, the Company faces, and expects to
continue to face, significant competition from the ILECs, which currently
dominate their local telecommunications markets.
 
                                       47
<PAGE>
    The Company competes with the ILECs in its markets for local exchange
services on the basis of product offerings, reliability, state-of-the-art
technology, price, route diversity, ease of ordering and customer service.
However, the ILECs have long-standing relationships with their customers and
provide those customers with various transmission and switching services that
the Company, in many cases, does not currently offer. The Company has sought,
and will continue to seek, to achieve parity with the ILECs in order to become
able to provide a full range of local telecommunications services. See
"Regulatory Overview" for additional information concerning the regulatory
environment in which the Company operates. Existing competition for private line
and special access services is based primarily on quality, capacity and
reliability of network facilities, customer service, response to customer needs,
service features and price, and is not based on any proprietary technology. As a
result of the comparatively recent installation of the Company's fiber optic
networks, its dual path architectures and the state-of-the-art technology used
in its networks, the Company may have cost and service quality advantages over
some currently available ILEC networks.
 
    OTHER COMPETITORS
 
    The Company also faces, and expects to continue to face, competition from
other potential competitors in certain of the markets in which the Company
offers its services. In addition to the ILECs and CAPs, potential competitors
capable of offering switched local and long distance services include long
distance carriers such as AT&T, MCI, Sprint and WorldCom, Inc., cable television
companies, such as Tele-Communications, Inc. and Time Warner Inc., electric
utilities, microwave carriers, wireless telephone system operators and private
networks built by large end-users.
 
    The Company believes that the Telecom Act as well as a recent series of
completed and proposed transactions between ILECs and long distance companies
and cable companies increase the likelihood that barriers to local exchange
competition will be removed. The Telecom Act states that entry barriers must be
lowered in the areas served by ILECs that are subsidiaries of RBOCs before such
ILECs are permitted to provide in-region, interLATA services. When ILECs that
are RBOC subsidiaries are permitted to provide such services, they will be in a
position to offer single source service. ILECs that are not RBOC subsidiaries
may offer single source service presently.
 
    In some cases, cable television companies are upgrading their networks with
fiber optics and installing facilities to provide fully interactive transmission
of broadband voice, video and data communications. In addition, under the
Telecom Act, electric utilities may install fiber optic telecommunications cable
and may facilitate provision of telecommunications services by electric
utilities over those networks if granted regulatory authority to do so. Cellular
and PCS providers may also be a source of competitive local telephone service.
 
    The Company also competes with equipment vendors and installers, and
telecommunications management companies, with respect to certain portions of its
business.
 
    A continuing trend toward business combinations and alliances in the
telecommunications industry may create significant new competitors to the
Company. In addition, many of the Company's existing and potential competitors
have financial, personnel and other resources, including name recognition,
significantly greater than those of the Company.
 
    The Company also competes with long distance carriers in the provision of
long distance services. Although the long distance market is dominated by four
major competitors, AT&T, MCI, Sprint and WorldCom, Inc., hundreds of other
companies also compete in the long distance marketplace.
 
    With respect to the Company's enhanced communications service offerings,
each is subject to competition. For example, there are several competitors that
offer IVR services, such as Call Interactive, which the Company believes focuses
its sales efforts on large volume IVR service users. Another competitor,
Telemedia, which is owned by Sprint, also offers significant call volume
capacity. With
 
                                       48
<PAGE>
respect to Magic Number, the Company's virtual communications center, there are
numerous competitors with product offerings that include some or all of the
services offered by Magic Number.
 
PURCHASING AND DISTRIBUTION
 
    With respect to the Company's fiber optic networks, which constitute the
Company's most significant capital investments, the Company has entered into
general purchase agreements with key equipment suppliers for fiber and fiber
optic transmission equipment, with Nortel for telecommunications switches, and
with other suppliers for various other components of each system. These
agreements provide the basic framework under which purchase orders for these
system components will be made. The specific purchases made for each network
depend upon the configuration and other factors related to the network, such as
the prospective customer base and location and the services to be offered over
the network. Once these decisions are made, purchase orders for the appropriate
fiber and selected equipment types are placed under the general purchase
agreements. In connection with the Company's provision of long distance
services, it purchases capacity at wholesale rates from long distance carriers.
 
PROPERTIES
 
    The Company owns or leases, in its operating territories, telephone property
which includes: fiber optic backbone and distribution network facilities;
point-to-point distribution capacity; central office switching equipment;
connecting lines between customers' premises and the central offices; and
customer premise equipment.
 
    The fiber optic backbone and distribution network and connecting lines
include aerial and underground cable, conduit, and poles and wires. These
facilities are located on public streets and highways or on privately owned
land. The Company has permission to use these lands pursuant to consent or
lease, permit, easement, or other agreements. The central office switching
equipment includes electronic switches and peripheral equipment.
 
    The Company and its subsidiaries lease facilities for their administrative
and sales offices, network nodes and warehouse space. The various leases expire
in years ranging from 1997 to 2016. Most have renewal options. Additional office
space and equipment rooms will be leased as the Company's operations and
networks are expanded and as new networks are constructed.
 
EMPLOYEES
 
    As of June 30, 1997, the Company employed 845 people, including full-time
and part-time employees. The Company considers its employee relations to be
good. None of the employees of the Company is covered by a collective bargaining
agreement.
 
TRADEMARKS AND TRADE NAMES
 
    The Company uses the name "NEXTLINK" as its primary business name. In July
1995, the Company filed for federal trademark protection of this name and
received its notice of allowance from the U.S. Patent and Trademark Office on
July 1, 1997. In addition, filings have been made to register the distinctive
floating X and related marks as protected trademarks under federal law. These
filings all are pending. The Company has no assurance that they will be granted.
 
LEGAL PROCEEDINGS
 
    The Company is not currently a party to any legal proceedings, other than
regulatory and other proceedings that are in the normal course of its business.
 
                                       49
<PAGE>
                                   MANAGEMENT
 
    The following table sets forth the names, ages and positions of the
executive officers and members of the Company's board of directors. Their
respective backgrounds are described following the table.
 
<TABLE>
<CAPTION>
NAME                                                       AGE                            POSITION
- -----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
Steven W. Hooper(3)..................................          44   Chairman of the Board
Wayne M. Perry(1)....................................          47   Vice Chairman and Chief Executive Officer
James F. Voelker(1)..................................          46   President and Director
Jan Loichle..........................................          49   Vice President, Chief of Local Exchange Operations
Kathleen H. Iskra....................................          41   Vice President, Chief Financial Officer and Treasurer
R. Bruce Easter, Jr..................................          40   Vice President, General Counsel and Secretary
Charles P. Daniels...................................          41   Vice President, Chief Technology Officer
R. Gerard Salemme....................................          43   Vice President, External Affairs and Industry
                                                                    Relations
Bruce Allenbaugh.....................................          41   Vice President, Marketing Services
Craig O. McCaw.......................................          47   Director
Dennis Weibling(1)(2)(3).............................          46   Director
Scot Jarvis(2).......................................          36   Director
William A. Hoglund(1)(2).............................          43   Director
</TABLE>
 
- ------------------------
 
(1) Member of the Executive Committee
 
(2) Member of the Compensation Committee
 
(3) Member of the Audit Committee
 
    The following persons are the presidents of the Company's operating
subsidiaries:
 
<TABLE>
<CAPTION>
NAME                                                       AGE                            POSITION
- -----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
Hugh C. Cathey.......................................          47   President of NEXTLINK Ohio, L.L.C.
Greg Green...........................................          33   President of NEXTLINK Washington, L.L.C.
Don Hillenmeyer......................................          51   President of NEXTLINK Tennessee, L.L.C.
Jeff C. Stone........................................          39   President of NEXTLINK Interactive, L.L.C.
Dwayne Nielson.......................................          42   President of NEXTLINK Utah, L.L.C.
Gary Rawding.........................................          45   President of NEXTLINK Pennsylvania, L.P.
Donald W. Sessamen...................................          64   President of NEXTLINK California, L.L.C.
Richard Kingston.....................................          37   President of NEXTLINK Illinois, Inc.
</TABLE>
 
    Directors of the Company are elected annually at the annual meeting of
stockholders. The next annual meeting of stockholders is scheduled for May 1998.
All of the officers identified above serve at the discretion of the Board of
Directors of the Company. There are no family relationships between any person
identified above. In connection with the listing of the Class A Common Stock on
the Nasdaq National Market, the Company intends to nominate two individuals as
independent directors.
 
    The Audit Committee is responsible for reviewing the services provided by
the Company's independent auditors, consulting with the independent auditors on
audits and proposed audits of the Company and reviewing the need for internal
auditing procedures and the adequacy of internal controls. The Compensation
Committee determines executive compensation and stock option awards. The
Executive Committee exercises, to the maximum extent permitted by law, all
powers of the Board of Directors between board meetings, except those functions
assigned to specific committees. The Board of Directors may establish additional
committees from time to time.
 
    The following are brief biographies of persons identified above.
 
    STEVEN W. HOOPER. Mr. Hooper has been Chairman of the Board since July 21,
1997. Prior to that, Mr. Hooper was Vice Chairman of the Company since June 16,
1997. Mr. Hooper was formerly President and Chief Executive Officer of AT&T
Wireless Services, Inc., following the merger with McCaw Cellular.
 
                                       50
<PAGE>
Prior to being appointed President and Chief Executive Officer, he served as
Chief Financial Officer for two years. This was preceded by five years as
Regional President for Cellular One's Pacific Northwest/ Rocky Mountain region,
where his responsibilities included managing the cellular operations in six
western states and Alaska. Mr. Hooper is a member of the Audit Committee of the
Board of Directors.
 
    WAYNE M. PERRY. Mr. Perry has been Chief Executive Officer of the Company
since July 21, 1997 and Vice Chairman of the Company since June 16, 1997. Mr.
Perry was formerly Vice Chairman of AT&T Wireless Services, Inc. since September
1994, following the merger with McCaw Cellular. Prior to the merger, he served
as Vice Chairman of the Board of McCaw Cellular since June 1989, and before that
served as President since December 1985. Prior to becoming President of McCaw
Cellular, Mr. Perry served as Executive Vice President and General Counsel and
was primary legal officer from 1976 to 1985. Mr. Perry was appointed Vice
Chairman of the Board of LIN Broadcasting Corporation on March 5, 1990. He also
served as Chairman of the Board of Directors of the Cellular Telecommunications
Industry Association, the nationwide wireless industry association, for the
1993/94 term. Mr. Perry is a member of the Executive Committee of the Board of
Directors.
 
    JAMES F. VOELKER. Mr. Voelker has been the President of NEXTLINK since April
1995 and is responsible for developing the company vision and guiding overall
operations. He is recognized as one of the early entrepreneurs in the business
of building and delivering competitive local exchange service. Mr. Voelker's
career in telecommunications spans almost two decades and includes experience in
very different segments of the industry in a variety of executive positions.
From 1981 to 1984 he served as vice president of sales, marketing and customer
service for Lexitel Corporation, the forerunner of Allnet Communications. Mr.
Voelker co-founded Digital Signal Inc. and served as chief operating officer and
chief executive officer from 1985 through the company's sale to SP Telecom in
1990. Digital Signal operated a nation wide fiber optic network supplying
capacity, engineering, provisioning and operational support to over one hundred
interexchange carriers. In the CAP arena, Mr. Voelker became vice chairman of
City Signal Inc. in 1992, which constructed and operated networks in six
markets. Subsequently, he served as its chief executive officer after the
company merged with its sister company Teledial America to form U.S. Signal.
Based in Grand Rapids, Michigan, U.S. Signal was one of the first fully
certified CLECs in the country. Mr. Voelker has served as vice chairman of ALTS,
the industry Association of Local Telephone Service providers and as a director
of Phoenix Network Inc., a publicly held long distance company. Mr. Voelker is
also a member of the Executive Committee of the Board of Directors.
 
    JAN LOICHLE. Ms. Loichle has been Vice President, Chief of Local Exchange
Operations of NEXTLINK since October 1996. Prior to that, Ms. Loichle was the
President of NEXTLINK Solutions (the virtual communications center) from July
1995. Prior to joining NEXTLINK, Ms. Loichle was Executive Vice President at
U.S. Signal in Detroit and Grand Rapids, Michigan from April 1993 to July 1995.
At U.S. Signal Ms. Loichle led the development of an enhanced service platform
(Magic Number) from concept through production system and implementation. From
1990 to 1993, Ms. Loichle was Assistant Vice President of Finance for SP Telecom
in San Francisco. Prior to that, Ms. Loichle was Vice President of Financial
Operations for Lexitel/Allnet/ALC in Birmingham, Michigan from December 1980 to
October 1989.
 
    KATHLEEN H. ISKRA. Ms. Iskra has been Vice President, Chief Financial
Officer and Treasurer of NEXTLINK since January 1996. Prior to that, she was
President and Chief Executive Officer of Horizon Air, a wholly owned subsidiary
of Alaska Air Group. Prior to her appointment at Horizon Air, Ms. Iskra served
as staff vice president of finance and controller of Alaska Airlines and Alaska
Air Group. Ms. Iskra's service with Alaska began in 1987, when she was appointed
Controller. Prior to joining Alaska, she was an audit manager with Arthur
Andersen.
 
    R. BRUCE EASTER, JR. Mr. Easter has been Vice President, General Counsel and
Secretary of NEXTLINK since January 1995. From 1986 to December 1994, Mr. Easter
was an associate and then
 
                                       51
<PAGE>
partner in the law firm of Davis Wright Tremaine in Seattle, Washington, where
he focused on communications law and media matters. Prior to joining Davis
Wright Tremaine, Mr. Easter was a legal assistant at Home Box Office, Inc. from
1980 through 1986.
 
    CHARLES P. DANIELS. Mr. Daniels has been Vice President, Chief Technology
Officer since July 1997. Prior to that, Mr. Daniels was Vice President, Chief
Marketing Officer of NEXTLINK from November 1995. From 1992 to 1995, Mr. Daniels
worked for MCI where he was the founder and Program Manager of the network MCI
Developers Lab. Mr. Daniels was also a founding member of MCI's Advanced
Technology Group. Prior to joining MCI, Mr. Daniels worked for Manufacturers
Hanover Trust from 1989 to 1992 as Vice President/Strategic Technology &
Research, where he was responsible for evaluating and implementing new
technologies that either reduced costs or generated new revenue.
 
    R. GERARD SALEMME. Mr. Salemme has been Vice President, External Affairs and
Industry Relations since July 1997. Prior to joining NEXTLINK, Mr. Salemme was
Vice President -Government Affairs at AT&T Corp. from December 1994. Prior to
joining AT&T Corp., Mr. Salemme was Senior Vice President-- External Affairs at
McCaw Cellular from 1991 to December 1994.
 
    BRUCE ALLENBAUGH. Mr. Allenbaugh has been Vice President, Marketing Services
since July 1997. Prior to that, Mr. Allenbaugh was Director of Marketing for the
Company from December 1994. Prior to joining NEXTLINK, Mr. Allenbaugh was
Director of Market Development with the Pepsi-Cola Company from August 1993 to
December 1994, Director of New Products from April 1991 to August 1993 and
Director of Advertising from September 1990 to April 1991.
 
    CRAIG O. MCCAW. Mr. McCaw has been a director of the Company since September
1994 and was Chief Executive Officer of NEXTLINK from September 1994 to July 21,
1997. Mr. McCaw is also Chairman and Chief Executive Officer of Eagle River, a
company formed and owned by Mr. McCaw to make strategic investments in
telecommunications ventures. Mr. McCaw was the founder, chairman and chief
executive officer of McCaw Cellular Communications, Inc. ("McCaw Cellular"), the
nation's leading provider of wireless communications services, until the company
was sold to AT&T in August 1994. Prior to entering the cellular telephone
business in 1973, Mr. McCaw took over daily operation of a small cable
television operation in Centralia, Washington, that he and his three brothers
owned. Under his leadership, this one-system operation serving 4,000 subscribers
eventually grew to be the nation's 20th largest cable operator serving 450,000
subscribers. In 1974, he expanded the cable company's services by entering the
paging and conventional mobile telephone industries and eventually became the
fifth largest paging operator in the country, serving approximately 320,000
subscribers in 13 states. In 1981, Mr. McCaw saw the revolutionary potential of
wireless communications and committed the company to developing broad-based
cellular telephone services. Later, McCaw Cellular became the nation's largest
cellular telephone operator, with cellular system positions in more than 100
U.S. cities, representing more than 100 million potential customers. The company
also had interests in wireless data transmissions, personal communications
services, air-to-ground phone systems and satellite communications at the time
of its sale to AT&T. Mr. McCaw is one of the two principal owners of Teledesic
Corporation, which in March 1994 announced plans for a worldwide satellite-based
telecommunications system. Mr. McCaw is indirectly a significant stockholder, a
director and Chairman of the Operating Committee of Nextel Communications, Inc.,
a provider of wireless telecommunications services.
 
    DENNIS WEIBLING. Mr. Weibling has been a director of the Company since
January 1997 and had been Executive Vice President of NEXTLINK since September
1994. Mr. Weibling is also President of Eagle River, Inc., since October 1993.
Mr. Weibling is a director and member of Nextel Communications, Inc.'s board,
operations, audit and compensation committees. Nextel is a leading provider of
integrated wireless communications services for teams of mobile workers. Mr.
Weibling serves on the board and executive committee of Teledesic Corporation, a
satellite telecommunications company backed by Mr. McCaw and Microsoft founder
Mr. William Gates. Mr. Weibling is a director of Cable Plus, one of the leading
providers of private cable television and telephony service to residential
apartment complexes. A
 
                                       52
<PAGE>
licensed certified public accountant in Washington, Mr. Weibling is a member of
the American Society of Certified Public Accountants and the Washington Society
of Certified Public Accountants. In addition, Mr. Weibling is a licensed
attorney in Ohio and a member of the American Bar Association and Ohio State Bar
Association. Mr. Weibling is also a member of the Executive Committee,
Compensation Committee and Audit Committee of the Board of Directors.
 
    SCOT JARVIS. Mr. Jarvis has been a director of the Company since January
1997 and, prior to that, had been Executive Vice President of NEXTLINK since
September 1994, was a Vice President of Eagle River, Inc. from October 1994
through April 1996. Mr. Jarvis is the co-founder and since March 1997 has been a
member of Cedar Grove Partners, LLC. Prior to that, Mr. Jarvis was the acting
President of the Company from September 1994 to April 1995. Prior to joining
Eagle River, Inc., Mr. Jarvis served as Vice President of McCaw Development
Corporation from 1993 to 1994 and of McCaw Cellular from 1985 through 1994.
During his tenure at McCaw Cellular, Mr. Jarvis served in the positions of
General Manager from 1990 to 1993, Vice President of Acquisitions and
Development from 1988 to 1990 and Assistant Vice President from 1985 to 1988.
Mr. Jarvis also recently served on the Board of Directors or executive
committees of: Nextel Communications, Inc., PriCellular Corporation, Horizon
Cellular Group, Los Angeles Cellular Telephone Company, Cellular 2000
Partnership, Cybertel Cellular Telephone Company (St. Louis), Northwest Cellular
Partnership, and Movitel del Noroeste (Mexico Region). Mr. Jarvis has also
served as the President of the Iberia Cellular Telephone Company from 1991 to
1994. Mr. Jarvis is also a member of the Compensation Committee of the Board of
Directors.
 
    WILLIAM A. HOGLUND. Mr. Hoglund has been a director of the Company since
January 1997 and, prior to that, had been Executive Vice President of NEXTLINK
since February 1996. Mr. Hoglund is also Vice President and Chief Financial
Officer of Eagle River, Inc. since January 1996. Prior to joining Eagle River,
Inc., Mr. Hoglund was a Managing Director of J.P. Morgan & Co. in its investment
banking group. Mr. Hoglund was employed by J.P. Morgan & Co. from 1977 through
1995, focusing for the past nine years on clients in the telecommunications,
cable and media industries. Mr. Hoglund is also a member of the Executive and
Compensation Committees of the Board of Directors.
 
    The following individuals are the senior management of the Company's
subsidiaries.
 
    HUGH C. CATHEY. Mr. Cathey has been the President of NEXTLINK Ohio since
August 1996. Prior to joining NEXTLINK, Mr. Cathey had nearly 20 years of
experience in the telecommunications industry. From 1993 to 1996, Mr. Cathey was
president and chief executive officer of Digital Network, Inc., a publicly
traded, facilities-based long distance company based in Dallas, Texas. From 1989
to 1993, Mr. Cathey served as president and chief executive officer of United
Telemanagement, Inc. Prior to that, Mr. Cathey held sales and product management
positions of increasing responsibility with AT&T, culminating as the senior
executive of a business unit of AT&T with annual revenues of approximately $100
million. During Mr. Cathey's tenure at United Telemanagement, Inc., that company
filed a petition under the Federal bankruptcy laws.
 
    GREG GREEN. Mr. Green has been the President of NEXTLINK Washington since
March 1995. Prior to that, from 1985 through March 1995, Mr. Green was the
founder and former President of Tel-West Communications, Inc. ("Tel-West") until
the Company's acquisition of certain assets of that company. At Tel-West, Mr.
Green provided overall management of business development, sales and customer
service. Mr. Green successfully negotiated with the Washington State Utilities
and Transportation Commission to become the second competitive local exchange
carrier in Washington State's history and the first in the city of Spokane.
 
    DON HILLENMEYER. Mr. Hillenmeyer has been the President of NEXTLINK
Tennessee since March 1995. Prior to joining NEXTLINK in March of 1995, Mr.
Hillenmeyer was president of MCMG, Inc., a Nashville-based wireless
communications management consulting and operations firm specializing in running
Rural Service Areas for independent cellular telephone owners. Before founding
MCMG, Inc.,
 
                                       53
<PAGE>
Mr. Hillenmeyer held various senior management positions at McCaw Cellular and
was responsible for 13 southern states from August 1986 to February 1990.
 
    JEFF C. STONE. Effective August 1, 1997, Mr. Stone will be President of
NEXTLINK Interactive (the interactive voice response provider). Prior to joining
the Company, Mr. Stone was Vice President and General Manager for the Western
Region of WorldCom, Inc. (previously MFS Telecom, Inc.) from 1994 to July 1997.
Prior to that, from 1989 to 1994, Mr. Stone was the Director of Sales and
Marketing of Associated Communications of Los Angeles.
 
    DWAYNE NIELSON. Mr. Nielson has been President of NEXTLINK Utah since
February 1996. Prior to joining NEXTLINK, Mr. Nielson was Assistant Vice
President, Consumer and Small Business Market, at Sprint Corporation from
October 1994 to February 1996. Prior to that, from August 1985 through October
1994, Mr. Nielson held a variety of sales and marketing positions at Sprint and
United Telephone.
 
    GARY RAWDING. Mr. Rawding has been President of NEXTLINK Pennsylvania since
September 1994. Prior to founding Penns Light Communications, Inc., certain
assets of which were acquired by the Company in September 1994, he served as
Vice President of Sales & Marketing at Eastern TeleLogic Corporation from 1989
until 1993. Prior to joining Eastern TeleLogic, Mr. Rawding held various
positions with Bell Atlantic Corporation.
 
    DONALD W. SESSAMEN. Mr. Sessamen has been President of NEXTLINK California
since November 1996. Prior to that, Mr. Sessamen acted as a consultant to
NEXTLINK. Prior to acting as a consultant to the Company, Mr. Sessamen joined
Brooks Fiber California in 1994 as president, after the company acquired Phoenix
Fiberlink. At Brooks Fiber California, Mr. Sessamen completed the installation
of the San Jose system and managed the entry into switched services in the
Sacramento market. From 1991 to 1994, Mr. Sessamen was executive vice president
of operations, engineering and MIS at SP Telecom, a fiber optic systems
construction and wholesale transmission company using Southern Pacific Railroad
rights-of-way east of the Mississippi River. At SP Telecom, Mr. Sessamen led SP
Telecom's entry into switch-based products utilizing the Northern Telecom DMS
250 Super Node, introducing innovative switch-based products.
 
    RICHARD KINGSTON. Mr. Kingston has been the President of NEXTLINK Illinois,
Inc. since July 1997. Prior to joining NEXTLINK, Mr. Kingston was the Western
Regional Vice President/General Manager of American Communications Services,
Inc. from April 1994 to July 1997. Prior to that, Mr. Kingston operated his own
telecommunications company, King Communications, Inc. from January 1992 to
January 1994. From December 1990 to January 1992, Mr. Kingston was West Region
Agent Manager for Telesphere Communications, Inc., and from 1988 to December
1990, Mr. Kingston was Director of Carrier Sales at MFS Communications Company,
Inc.
 
                                       54
<PAGE>
                           SUMMARY COMPENSATION TABLE
 
    The following table sets forth, for the fiscal year ended December 31, 1996,
individual compensation information for the Chief Executive Officer of the
Company and each of the four other most highly compensated executive officers of
the Company who were serving as executive officers at December 31, 1996 (the
"Named Executive Officers").
 
<TABLE>
<CAPTION>
                                                                                              LONG TERM
                                                                                             COMPENSATION
                                                      ANNUAL COMPENSATION                   --------------
                                      ----------------------------------------------------    SECURITIES
                                                                            OTHER ANNUAL      UNDERLYING       ALL OTHER
         NAME AND PRINCIPAL             FISCAL                    BONUS     COMPENSATION       OPTIONS       COMPENSATION
              POSITION                   YEAR      SALARY ($)    ($)(1)          ($)            (#)(2)          ($)(3)
- ------------------------------------  -----------  -----------  ---------  ---------------  --------------  ---------------
<S>                                   <C>          <C>          <C>        <C>              <C>             <C>
 
McCaw, Craig O......................        1995          -0-         -0-           -0-               -0-            -0-
  CEO (4)                                   1996          -0-         -0-           -0-               -0-            -0-
 
Voelker, James F....................        1995       89,405      87,000        11,542(5)      1,000,000            -0-
  President                                 1996      160,609     200,000           -0-            15,000          6,523
 
Kingery, Robert ....................        1995       65,589      88,082           -0-            98,347(7)          -0-
  President of                              1996      225,000      30,000           -0-             5,000          5,625
  NEXTLINK Interactive (6)
 
Iskra, Kathleen H...................        1995          -0-         -0-           -0-               -0-            -0-
  Vice President, Chief                     1996      121,233      65,250           -0-           153,500          1,575
  Financial Officer and
  Treasurer
 
Daniels, Charles P..................        1995       14,423      25,000           -0-           100,000            -0-
  Vice President, Chief                     1996      100,000      84,750           -0-             7,500          2,512
  Technology Officer
</TABLE>
 
- ------------------------
 
(1) Represents bonuses that were paid subsequent to the stated calendar year
    end.
 
(2) Represents Class B membership units granted in connection with the Company's
    equity option plan during 1995 and 1996, respectively.
 
(3) Represents contributions made by the Company on behalf of the executive
    officer under the Company's 401(k) Plan.
 
(4) Mr. McCaw resigned as the Company's Chief Executive Officer effective July
    21, 1997.
 
(5) Of this amount, $11,238 was allocated to temporary housing expenses.
 
(6) Mr. Kingery resigned his position with the Company effective July 31, 1997.
 
(7) This represents the number of options to acquire Class B units granted as a
    replacement for this executive's options to acquire membership interests in
    NEXTLINK Interactive.
 
                                       55
<PAGE>
                      OPTION GRANTS IN LAST FISCAL YEAR(1)
 
<TABLE>
<CAPTION>
                                                                                                        POTENTIAL REALIZABLE
                                                          INDIVIDUAL GRANTS                               VALUE AT ASSUMED
                                ----------------------------------------------------------------------    ANNUAL RATES OF
                                 NUMBER OF                                                                  SHARE PRICE
                                SECURITIES       % OF TOTAL                                               APPRECIATION FOR
                                UNDERLYING     OPTIONS GRANTED      EXERCISE OR                            OPTION TERM(2)
           NAME AND               OPTIONS      TO EMPLOYEES IN      BASE PRICE                          --------------------
      PRINCIPAL POSITION        GRANTED(#)     FISCAL YEAR(%)         ($/SH)       EXPIRATION DATE(3)    5% ($)     10% ($)
- ------------------------------  -----------  -------------------  ---------------  -------------------  ---------  ---------
<S>                             <C>          <C>                  <C>              <C>                  <C>        <C>
McCaw, Craig O................         -0-              -0-                -0-             N/A
Voelker, James F..............      15,000             1.45                .44       August 19, 2011        7,079     20,846
Kingery, Robert...............       5,000             0.48                .44       August 19, 2011        2,360      6,949
Iskra, Kathleen H.............      75,000             7.27                .01(4)    January 2, 2011       67,449    136,285
                                    75,000             7.27                .44       January 2, 2011       35,394    104,230
                                     3,500             0.34                .44       August 19, 2011        1,652      4,864
Daniels, Charles P............       7,500             0.73                .44       August 19, 2011        3,539     10,423
</TABLE>
 
- ------------------------
 
(1) Effective on January 31, 1997, NEXTLINK Communications, L.L.C. was merged
    with and into NEXTLINK Communications, Inc. The information presented in
    this table reflects the grant of options for the purchase of Class A Common
    Stock under the Company's Stock Option Plan in substitution for options
    granted previously pursuant to the Amended and Restated Equity Option Plan
    of NEXTLINK Communications, L.L.C. (the "EOP"). See Note 12 to the
    Consolidated Financial Statements.
 
(2) The dollar amounts under the 5% and 10% columns are the result of
    calculations required by the rules of the Securities and Exchange Commission
    ("SEC") and, therefore, are not intended to forecast possible future
    appreciation, if any, of the Class A Common Stock. The amounts shown reflect
    the difference between the appreciation and the exercise price at the
    assumed annual rates of appreciation through the fifteenth anniversary of
    the dates of grant.
 
(3) Options granted during 1996 vest either 20% at employment and 20% at the end
    of each subsequent year or 25% at the end of each of the next four years
    after grant.
 
(4) Market value on the date of grant was $.44 per security or $32,055 in the
    aggregate.
 
                    AGGREGATED FISCAL YEAR END OPTION VALUES
 
<TABLE>
<CAPTION>
                                    NUMBER OF UNEXERCISED          VALUE OF UNEXERCISED
                                          OPTIONS AT                   IN-THE-MONEY
                                       FISCAL YEAR END         OPTIONS AT FISCAL YEAR END(1)
                                 ----------------------------  -----------------------------
NAME                             EXERCISABLE   UNEXERCISABLE    EXERCISABLE   UNEXERCISABLE
- -------------------------------  ------------  --------------  -------------  --------------
<S>                              <C>           <C>             <C>            <C>
McCaw, Craig O.................          -0-            -0-              -0-            -0-
Voelker, James F...............      400,000        615,000    $   1,400,000   $  2,152,500
Kingery, Robert................       39,339         64,008          137,687        224,028
Iskra, Kathleen H..............       60,000         93,500          210,000        327,250
Daniels, Charles P.............       40,000         67,500          140,000        236,250
</TABLE>
 
- ------------------------
 
(1) Reflects the difference between the exercise price and a valuation of $3.50
    per unit. Because there is no public market for the Company's membership
    units, pursuant to the Equity Option Plan, the Plan's Administrative
    Committee determines the value of the Class B options at least as often as
    the end of each fiscal year. The valuation set forth above reflects the
    Administrative Committee's determination of per unit valuation at December
    31, 1996.
 
                                       56
<PAGE>
EMPLOYMENT AGREEMENTS
 
    The Company has entered into an employment agreement with James F. Voelker,
its President, for a term expiring on December 31, 1998, subject to earlier
termination. The agreement provides for a base salary of $187,500 for the period
from April 1, 1997 to December 31, 1997 and $275,000 for the period from January
1, 1998 to December 31, 1998, with a total annual bonus of $150,000 based upon
the performance of Mr. Voelker and the Company in light of the business plans
and budgets of the Company as recommended by Mr. Voelker and approved by the
Board. In addition, in connection with the execution of this employment
agreement, effective April 10, 1997, the Company granted Mr. Voelker options to
purchase 250,000 shares of Class A Common Stock, which options vest in equal
installments on each of the first four anniversaries of grant and have an
exercise price of $3.50 per share. The agreement also contains confidentiality
provisions.
 
    NEXTLINK Pennsylvania, L.P., an operating subsidiary of the Company, has
entered into an employment agreement with Gary A. Rawding, its President, for a
term expiring on September 15, 1997, subject to automatic month-to-month
extensions unless either party gives 30 days notice not to renew. The agreement
provides for a base salary of $110,000, with a total bonus of $50,000 for the
five-quarter period ended December 31, 1995 based on the attainment of goals and
milestones outlined in the agreement and $10,000 per quarter thereafter. If
NEXTLINK Pennsylvania, L.P. fails to renew the agreement or if employment is
terminated due to the cessation of its business, NEXTLINK Pennsylvania, L.P.
must pay Mr. Rawding his then-current monthly salary until one year after
termination. The agreement also contains non-compete, non-solicitation and
confidentiality provisions.
 
    NEXTLINK Washington, L.L.C. ("NEXTLINK Washington"), an operating subsidiary
of the Company, has entered into an employment agreement with Gregory Green as
its President for a term expiring March 28, 1998, subject to earlier
termination. The agreement provides for a base salary of $100,000 with a bonus
of $30,000 during the first year, $35,000 during the second year and $40,000
during the third year, in each case upon the achievement of objectives. The
agreement also contains non-compete, non-solicitation and confidentiality
provisions.
 
NEXTLINK COMMUNICATIONS, INC. STOCK OPTION PLAN
 
    The Company established the NEXTLINK Communications, Inc. Stock Option Plan
(the "Plan") to replace the EOP and to provide a performance incentive for
certain officers, employees, and individuals who provide services to the
Company, and to enable these individuals to acquire or increase proprietary
interest in the success of the Company.
 
    Pursuant to the terms of the Plan, the Company's Board of Directors (the
"Board") has reserved the right to terminate, modify, or amend the Plan subject
to the following restriction: The Board must obtain shareholder approval for any
amendment that (1) increases the number of shares of Class A Common Stock
available under the Plan, (2) changes the Plan's eligibility provisions, or (3)
requires shareholder approval under applicable law.
 
    The Plan Administrator may modify or amend outstanding options granted under
the Plan, provided modification or amendment of an outstanding option shall not,
without the consent of the optionee, impair or diminish any of the optionee's
rights or any of the obligations of the Company. Except as otherwise provided in
the Plan, no outstanding option shall be terminated without the consent of the
optionee. Unless the optionee agrees otherwise, any change or adjustment to an
outstanding incentive stock option shall be made so as not to constitute a
"modification," as defined in Section 424(h) of the Internal Revenue Code of
1986, as amended (the "Code"), and so as not to cause the option to cease
qualifying as an incentive stock option, as defined in Code Section 422(b).
 
    The "Plan Administrator" is the Compensation Committee of the Board, and its
members are Messrs. Perry, Weibling, Jarvis and Hoglund. The Board may from time
to time remove members from, or
 
                                       57
<PAGE>
add members to, the Compensation Committee. Vacancies on the committee, however
caused, may be filled by the Board.
 
    The Plan Administrator acts as the manager of the Plan, possessing
discretionary authority to determine all matters relating to the options to be
granted. The Plan Administrator has the sole authority to interpret the
provisions of the Plan, any option issued under the Plan, and any rule or
regulation applicable to the Plan. The Plan Administrator's interpretation is
conclusive and binding on all interested parties, so long as the interpretation
and construction with respect to incentive stock options corresponds to the
requirements of Code Section 422, the regulations thereunder, and any amendments
thereto.
 
    The stock available under the stock options granted under the Plan are
shares of the Company's authorized but unissued Class A Common Stock. The total
number of shares that may be issued pursuant to options under the Plan,
including both incentive and non-statutory options, shall not exceed an
aggregate of 10,000,000 shares.
 
    Incentive stock options may be granted only to officers and other employees
of the Company (or a parent or subsidiary corporation of the Company), including
Board members who are also employees of the Company (or employees of a parent or
subsidiary corporation of the Company). Non-statutory options may be granted to
both employees and non-employees of the Company (or a corporate or non-corporate
parent or subsidiary), including non-employee Board members. Certain limitations
apply to 10% shareholders.
 
    Within the parameters established by the Plan, the Plan Administrator has
the sole discretion to determine the options to be granted under the Plan,
including selection of the individuals receiving option grants, the number of
shares available under each option, the exercise price, and all other terms and
conditions of the options. Separate option grants under the Plan need not be
identical in any respect, even when made simultaneously. The Plan Administrator
shall issue each optionee an individual "option agreement," which describes the
relevant terms of the option.
 
    The purchase price per share of Class A Common Stock under each incentive
stock option shall be not less than the fair market value of the Class A Common
Stock on the date the option is granted, except where the option is a
substituted or assumed option from another plan, and the exercise price relates
to the original exercise price, in accordance with applicable provisions of the
Code. Certain additional limitations apply to 10% shareholders. The purchase
price per share of Class A Common Stock under each non-statutory stock option
shall be not less than 85% of the fair market value of the Class A Common Stock
on the date the option is granted, except where the option is a substituted or
assumed option from another plan, and the exercise price relates to the option's
original exercise price.
 
    The aggregate shares of Class A Common Stock available to an optionee
through incentive stock options, which are exercisable for the first time during
a calendar year, shall not exceed $100,000 in value. For purposes of this limit,
the Class A Common Stock shall be valued at its fair market value as of the
option grant date. To the extent an incentive stock option exceeds this
limitation, it shall be considered a non-statutory stock option.
 
    An optionee must exercise his or her option, if at all, before it expires.
Each option shall expire on the date specified in the individual option
agreement, which date shall not be later than the tenth anniversary of the date
on which the option was granted with respect to incentive stock options, the
15th anniversary with respect to non-statutory options and the fifth anniversary
in the case of a 10% stockholder.
 
    Options granted under the Plan and the rights and privileges conferred
thereby may not be transferred, assigned, pledged, or hypothecated in any manner
(whether by operation of law or otherwise), other than by will or applicable
laws of descent and distribution; provided that non- statutory stock options may
be transferred to a revocable trust established by the optionee for his or her
descendants, to an immediate family member, or to a partnership in which only
immediate family members or such
 
                                       58
<PAGE>
estate-planning trusts are partners. Options shall not be subject to execution,
attachment, or similar process. Upon any attempt to transfer, assign, pledge,
hypothecate, or otherwise dispose of any option under the Plan, or any rights or
privilege conferred by the Plan, contrary to the provisions of the Plan, or upon
the sale or levy or any attachment or similar process upon the rights and
privileges conferred by the Plan, such option shall thereupon terminate and
become void. No person may create a lien on any funds, securities, or other
property held under the Plan.
 
    Options granted under the Plan shall generally expire on the earlier of the
following two events: (i) the date of expiration expressed in the individual
option agreement, or (ii) three months after termination of employment (unless
the termination is for cause, in which case the option shall immediately
expire). Special rules apply in the event of an optionee's death or disability.
In addition, options shall terminate if the shareholders of the Company receive
cash, stock, or other property in exchange for or in connection with their
shares of Class A Common Stock as a result of a merger, consolidation,
acquisition of property or stock, separation, reorganization, or liquidation of
the Company (other than a mere reincorporation, creation of a holding company,
or merger in which the Company's shareholders receive a corresponding number of
shares of Class A Common Stock in the survivor corporation). Prior to such an
event, the optionee shall have the right to exercise his or her option, in whole
or in part, to the extent vested.
 
                                       59
<PAGE>
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
    From the inception of NEXTLINK through the end of 1995, NEXTLINK's capital
and operational funding was provided on an as needed basis, primarily by Eagle
River. During this period, under NEXTLINK's limited liability company agreement,
one equity unit was issued for each dollar in cash or assets contributed to
NEXTLINK. The equity ownership units issued from time to time during the course
of this period thus reflect this one dollar to one equity unit equivalency. As
of June 30, 1997, Eagle River had contributed approximately $53.9 million to
NEXTLINK and had received approximately 53.9 million Class A Units in NEXTLINK
Communications, L.L.C., which were converted to approximately 72.3 million
shares of the Company's Class B Common Stock on January 31, 1997, including
certain issuances described below.
 
    On September 15, 1994, NEXTLINK lent $100,000 to Gary A. Rawding, President
of NEXTLINK Pennsylvania, L.P. This loan is unsecured and is due September 15,
2004, or upon the sale of more than one-half of his interest in NEXTLINK
Pennsylvania, L.P. This loan bears interest at the prime rate and requires
annual interest payments on September 15.
 
    On August 18, 1995, NEXTLINK lent $93,141 to James F. Voelker, NEXTLINK's
President, in connection with his relocation to Washington. This loan bears
interest at the prime rate and principal and interest are due on the earlier of
December 31, 1998 or the sale of Mr. Voelker's former residence. In April 1997,
$25,000 in principal amount of this loan was forgiven as part of the payment of
Mr. Voelker's 1996 bonus.
 
    On September 1, 1995, NEXTLINK agreed to pay $3.0 million to BWP, Inc. in
connection with the acquisition of certain assets of Sound Response Corporation.
A payment of $1.5 million was made on September 1, 1996 and an additional
payment of $1.5 million is due September 1, 1997. In addition, NEXTLINK issued
approximately 4.4 million Class A Units in NEXTLINK Communications, L.L.C.,which
were converted to approximately 5.9 million shares of the Company's Class B
Common Stock on January 31, 1997 to BWP, Inc. in connection with this asset
acquisition.
 
    On January 31, 1995, Eagle River lent NEXTLINK $3.3 million in connection
with the acquisition of certain assets from City Signal, Inc. The note was
unsecured and bore interest at the prime rate plus 2%. The note plus accrued
interest was repaid with a portion of the net proceeds of NEXTLINK's offering of
12 1/2% Notes. NEXTLINK's principal equity owner, Mr. Craig O. McCaw, through
Eagle River made advances to NEXTLINK primarily to fund NEXTLINK's capital
expenditures (excluding acquisitions) and operating losses between January 1996
and April 1996. These advances of approximately $32.2 million, including accrued
interest, were repaid using a portion of the net proceeds of the offering of the
12 1/2% Notes.
 
    During 1995, Eagle River lent NEXTLINK $7.3 million in connection with asset
acquisitions and operating expenses. The note bore interest at the prime rate
plus 2% and, on December 1, 1995, was converted to equity and approximately 7.3
million Class A Units in NEXTLINK Communications, L.L.C., which, along with the
other Units owned by Eagle River, were converted to shares of Class B Common
Stock of the Company on January 31, 1997.
 
    During 1995, NEXTLINK incurred expenses for administrative services provided
by U.S. Signal, a minority shareholder of NEXTLINK, pursuant to temporary
agreements related to the acquisitions of certain assets from City Signal, Inc.
NEXTLINK recorded expenses in connection with fees to U.S. Signal of $1.5
million in 1995.
 
    Each share of the Company's Class B Common Stock is convertible at the
option of the holder thereof, at any time, into one share of Class A Common
Stock. The Company and the current holders of the Company's Class B Common Stock
and the holders of options to purchase Class B Common Stock have entered into a
Registration Rights Agreement (the "Company Registration Rights Agreement"),
which, among other things, will provide that at any time after a Qualifying IPO
(as defined) and upon the request of holders of at least 4% of the outstanding
Class B Common Stock that is subject to the
 
                                       60
<PAGE>
Company Registration Rights Agreement, the Company will register under the
Securities Act any of the shares of Class A Common Stock currently held by, or
to be acquired in the future by, such holders, for sale in accordance with such
holders' intended method of disposition thereof (a "Demand Registration"). The
holders of the Class B Common Stock will have the right to request two Demand
Registrations. The holders of the Class B Common Stock also will have the right,
at any time after the Qualifying IPO, to include the shares of Class A Common
Stock held by them in certain other registrations of common equity securities of
the Company initiated by the Company on its own behalf or on behalf of its
shareholders. The holders' rights under the Company Registration Rights
Agreement are not transferable. In addition, the holders of Class B Common Stock
and options to purchase Class B Common Stock have agreed to pay their pro rata
share of all costs and expenses incurred in connection with each registration of
their respective shares of Class A Common Stock. For purposes of the Company
Registration Rights Agreement, "Qualifying IPO" means a public offering of Class
A Common Stock that results in net proceeds to the Company of not less than
$75,000,000 or such lesser amount as the Board of Directors of the Company may,
in their discretion, determine to be adequate to commence the rights of the
holders under the Company Registration Rights Agreement.
 
    In June 1997, the Company issued options to purchase 1,000,000 shares of
Class A Common Stock to each of Wayne M. Perry and Steven W. Hooper. The options
vest 25% at the end of each of the four years after grant, and were issued with
exercise prices of $3.50 per share. None of such options are currently
exerciseable.
 
                                       61
<PAGE>
         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
    The following table sets forth certain information as of June 30, 1997, with
respect to the beneficial ownership of NEXTLINK's capital stock by (i) each
person known by the Company to own beneficially 5% or more of the outstanding
shares of capital stock, (ii) the Company's Board of Directors, (iii) the
Company's Chief Executive Officer and each of the Named Executive Officers and
(iv) all directors and executive officers as a group.
<TABLE>
<CAPTION>
                                                                                                    SHARES BENEFICIALLY OWNED
                                                        SHARES BENEFICIALLY OWNED                        AFTER THE STOCK
                                                      PRIOR TO THE STOCK OFFERING(1)                       OFFERING(1)
                                        ----------------------------------------------------------  -------------------------
                                         AMOUNT AND                PERCENT OF TOTAL   PERCENT OF     AMOUNT AND
    NAME AND ADDRESS OF      TITLE OF    NATURE OF    PERCENT OF        SHARES       TOTAL VOTING    NATURE OF    PERCENT OF
     BENEFICIAL OWNER          CLASS     OWNERSHIP     CLASS (%)   OUTSTANDING (%)     POWER (%)     OWNERSHIP     CLASS (%)
- ---------------------------  ---------  ------------  -----------  ----------------  -------------  ------------  -----------
<S>                          <C>        <C>           <C>          <C>               <C>            <C>           <C>
Eagle River, LLC...........  Class A         15,000         3.61           86.57           86.95         15,000
  2300 Carillon Point        Class B     72,307,914        86.99                                     72,307,914
  Kirkland, WA 98033
 
BWP, Inc. .................  Class A              0            0            7.08            7.11              0
  707 S.W. Washington,       Class B      5,914,497(2)       7.12                                     5,914,497(2)
  8th Floor
  Portland, OR 97205
 
Craig O. McCaw.............  Class A         15,000(3)       3.61          87.30           87.67         15,000(3)
  2300 Carillon Point        Class B     72,911,686(3)      87.72                                    72,911,686(3)
  Kirkland, WA 98033
 
Dennis Weibling............  Class A         15,000(4)       3.61          86.57           86.95         15,000(4)
  2300 Carillon Point        Class B     72,307,914(4)      86.99                                    72,307,914(4)
  Kirkland, WA 98033
 
James F. Voelker...........  Class A        603,750(5)      60.15           4.76            4.18        603,750(5)
  155 108th Avenue, N.E.,    Class B      3,571,364(6)       4.12                                     3,571,364(6)
  Suite 810
  Bellevue, WA 98004
 
Comdisco, Inc. ............  Class A        400,000       100.00               *               *        400,000
  6111 North River Road      Class B              0            0                                              0
  Rosemont, IL 60018
 
Wayne M. Perry.............  Class A              0            0               0               0              0
                             Class B              0            0                                              0
 
Steven W. Hooper...........  Class A              0            0               0               0              0
                             Class B              0            0                                              0
 
Scot Jarvis................  Class A              0            0               *               *              0
                             Class B        670,283(7)          *                                       670,283(7)
 
William A. Hoglund.........  Class A              0            0               0               0              0
                             Class B              0            0                                              0
 
Robert Kingery.............  Class A         40,589(5)       9.21           2.54            2.51         40,589(5)
                             Class B      2,081,312(8)       2.50                                     2,081,312(8)
 
Kathleen H. Iskra..........  Class A         60,875(5)      13.21              *               *         60,875(5)
                             Class B              0            0                                              0
 
Charles P. Daniels.........  Class A         41,875(5)       9.48              *               *         41,875(5)
                             Class B              0            0                                              0
 
All directors and executive                        (5)                     91.49           91.77               (5)
 officers as a group (21
 persons)..................  Class A      1,177,948        74.65                                      1,177,948
                             Class B     79,586,576(9)      91.80                                    79,586,576(9)













 
<CAPTION>

                                SHARES BENEFICIALLY OWNED
                                    AFTER THE STOCK
                                      OFFERING(1)
                             -------------------------------
                             PERCENT OF TOTAL   PERCENT OF
    NAME AND ADDRESS OF           SHARES       TOTAL VOTING
     BENEFICIAL OWNER        OUTSTANDING (%)     POWER (%)
- ---------------------------  ----------------  -------------
<S>                          <C>               <C>
Eagle River, LLC...........
  2300 Carillon Point
  Kirkland, WA 98033
BWP, Inc. .................
  707 S.W. Washington,
  8th Floor
  Portland, OR 97205
Craig O. McCaw.............
  2300 Carillon Point
  Kirkland, WA 98033
Dennis Weibling............
  2300 Carillon Point
  Kirkland, WA 98033
James F. Voelker...........
  155 108th Avenue, N.E.,
  Suite 810
  Bellevue, WA 98004
Comdisco, Inc. ............
  6111 North River Road
  Rosemont, IL 60018
Wayne M. Perry.............
Steven W. Hooper...........
Scot Jarvis................
William A. Hoglund.........
Robert Kingery.............
Kathleen H. Iskra..........
Charles P. Daniels.........
All directors and executive
 officers as a group (21
 persons)..................
</TABLE>
 
                                           (FOOTNOTES APPEAR ON FOLLOWING PAGE.)
 
                                       62
<PAGE>
- ------------------------------
 
(1) In accordance with Commission rules, each beneficial owner's holdings have
    been calculated assuming full exercise of outstanding options exercisable by
    such owner within 60 days after June 30, 1997, but no exercise of
    outstanding options held by any other person. The table set forth below
    assumes that the over-allotment option is not exercised by the Underwriters
    and gives effect to the Stock Split. The information presented excludes
    certain holders who at June 30, 1997 and prior to the Stock Offering would
    hold more than 5% of the total outstanding shares of Class A Common Stock
    solely as a result of exercisable options. It is anticipated that after the
    Stock Offering each of these individuals would beneficially own less than 5%
    of the total outstanding shares of Class A Common Stock.
 
(2) Represents shares of Class B Common Stock held beneficially by Douglas Bean
    and Robert F. Kingery, who own 39.88% and 35.19%, respectively of the total
    shares held by BWP, Inc.
 
(3) Represents shares of Class A Common Stock and Class B Common Stock held
    beneficially by Mr. McCaw as a result of his ownership interests in Eagle
    River and NEXTLINK, Inc.
 
(4) Mr. Weibling, who is President of Eagle River, Inc., an affiliate of Eagle
    River, disclaims beneficial ownership in all securities held by Eagle River,
    except to the extent of his pecuniary interest therein. Mr. Weibling is a
    member of Eagle River.
 
(5) Represents shares of Class A Common Stock issuable upon exercise of stock
    options that are either currently exercisable or are exercisable during the
    next 60 days from June 30, 1997.
 
(6) Represents shares of Class B Common Stock that are eligible for acquisition
    upon exercise of a currently exercisable stock option.
 
(7) Includes 134,057 shares of Class B Common Stock held by the Rowena Family
    Limited Liability Company, of which Mr. Jarvis is the sole managing member.
 
(8) Represents shares of Class B Common Stock held beneficially by Mr. Kingery
    as a result of his ownership in BWP, Inc.
 
(9) See notes (3), (4), (6), (7) and (8) above.
 
*   Less than 1%.
 
                                       63
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The authorized capital stock of the Company consists of: (i) 350,000,000
shares of common stock, $.01 par value per share, which is divided into two
classes, consisting of 250,000,000 shares of Class A Common Stock (400,000
shares outstanding as of June 30, 1997) and 100,000,000 shares of Class B Common
Stock (83,123,084 shares outstanding as of June 30, 1997) (together, the "Common
Stock"); and (ii) 25,000,000 shares of preferred stock, $.01 par value per share
(the "Serial Preferred Stock"), of which 5,901,706 14% Senior Redeemable
Preferred Shares, par value $.01 per share (the "14% Preferred Shares"), are
issued and outstanding.
 
    The following summary of the Company's capital stock does not purport to be
complete and is qualified in its entirety by reference to the Certificate of
Incorporation and By-laws of the Company and the Certificate of Designations of
rights and preferences relating to the 14% Senior Redeemable Preferred Shares
("Certificate of Designations") that are included as exhibits to the
Registration Statement of which this Prospectus forms a part, and the applicable
provisions of the Washington Business Corporation Act.
 
COMMON STOCK
 
    Except as outlined below, the Class A Common Stock and Class B Common Stock
are identical in all respects. Each share of Class B Common Stock may be
converted, at any time and at the option of the holder thereof, into one share
of Class A Common Stock. The Class A Common Stock and the Class B Common Stock
are entitled to vote on all matters which come before the shareholders, voting
together as a single class. Each share of Class A Common Stock has one (1) vote
and each share of Class B Common Stock has ten (10) votes on all matters on
which holders of Common Stock are entitled to vote. Accordingly, holders of a
majority of the shares of Class B Common Stock entitled to vote in any election
of directors may elect all of the directors standing for election unless a
Voting Rights Triggering Event has occurred. The Board of Directors of the
Company has approved and submitted to the holders of the Class B Common Stock
for approval, an amendment to the Articles of Incorporation, which provides that
the Board of Directors shall have the sole discretion to require the conversion
of any shares of Class B Common Stock to Class A Common Stock in connection with
any transfer, or upon presentment to the Company for transfer, of such Class B
Common Stock, by contract, operation of law or otherwise. Holders of Common
Stock are entitled to receive ratably such dividends, if any, as may be declared
by the Board of Directors out of funds legally available therefor, subject to
any preferential dividend rights of outstanding Serial Preferred Stock. Upon the
liquidation, dissolution or winding-up of the Company, the holders of Common
Stock are entitled to receive ratably the net assets of the Company available
after the payment of all debts and other liabilities and subject to the prior
rights of any outstanding Serial Preferred Stock. Holders of Common Stock have
no preemptive, subscription or redemption rights. All the outstanding shares of
Common Stock are fully paid and nonassessable. The rights, preferences and
privileges of holders of Common Stock are subject to, and may be adversely
affected by, the rights of the holders of shares of any series of Serial
Preferred Stock (including the 14% Preferred Shares) that the Company may
designate and issue in the future.
 
PREFERRED STOCK
 
    Under the terms of the Company's Articles of Incorporation (the "Articles"),
the Board of Directors of the Company is authorized to issue the remaining
shares of Serial Preferred Stock in one or more series without shareholder
approval, subject to any limitations prescribed by law and those contained in
the Certificate of Designations. Each series of Serial Preferred Stock shall
have such rights, preferences, privileges and restrictions, including voting
rights, dividend rights, conversion rights, redemption privileges and
liquidation privileges, as shall be determined by the Board of Directors.
 
    The purpose of authorizing the Board of Directors to issue Serial Preferred
Stock and determine its rights and preferences is to eliminate delays associated
with a shareholder vote on specific issuances. The issuance of Serial Preferred
Stock, while providing desirable flexibility in connection with possible
acquisitions and other corporate purposes, could have the effect of making it
more difficult for a third party to acquire, or of discouraging a third party
from acquiring, a majority of the outstanding voting stock of the Company.
 
                                       64
<PAGE>
    The 14% Preferred Shares will, with respect to dividend rights and rights on
liquidation, winding-up and dissolution, rank (i) senior to each other class of
capital stock, including the Common Stock, the terms of which do not expressly
provide that it ranks senior to, or on a parity with, the 14% Preferred Shares
as to dividend rights and rights on liquidation, winding-up and dissolution of
the Company (collectively referred to as "Junior Shares"); (ii) subject to
certain conditions, on a parity with each other class of preferred stock
established hereafter by the Company the terms of which expressly provide that
such class or series will rank on a parity with the 14% Preferred Shares as to
dividend rights and rights on liquidation, winding-up and dissolution
(collectively referred to as "Parity Shares"); and (iii) subject to certain
conditions, junior to each class of preferred stock established after the date
hereof by the Company the terms of which expressly provide that such class or
series will rank senior to the 14% Preferred Shares as to dividend rights and
rights upon liquidation, winding-up and dissolution of the Company (collectively
referred to as the "Senior Shares"). The Company may not authorize any new class
of Senior Shares without the approval of the holders of at least two-thirds of
the 14% Preferred Shares then outstanding, voting or consenting as a separate
class. In addition, the Company may not authorize or issue any Parity Shares
(other than additional 14% Preferred Shares issued as dividends on the 14%
Preferred Shares) without the approval of the holders of at least a majority of
the 14% Preferred Shares then outstanding, voting or consenting as a separate
class, if after giving effect to the issuance of such Parity Shares the
aggregate liquidation preference of outstanding Parity Shares (other than the
14% Preferred Shares (including additional Preferred Shares issued as dividends
on the 14% Preferred Shares)) would exceed the sum of (x) $50 million and (y)
the aggregate amount of gross proceeds received after the Issue Date and on or
prior to the date of issuance of such Parity Shares from the issuance of Junior
Shares which are not redeemable on or prior to February 1, 2009, with certain
exceptions.
 
    Holders of the outstanding 14% Preferred Shares will be entitled to receive,
when, as and if declared by the Board of Directors of the Company, out of funds
legally available therefor, dividends on the 14% Preferred Shares at a rate per
annum equal to 14% of the liquidation preference per 14% Preferred Share,
payable quarterly.
 
    No dividends may be paid or set apart for the payment on Junior Shares
(except dividends on Junior Shares payable in additional Junior Shares) if full
cumulative dividends have not been paid in full (or deemed paid) on the 14%
Preferred Shares. So long as any 14% Preferred Shares are outstanding, the
Company shall not make any payment on account of, or set apart for payment money
for a sinking or other similar fund for, the purchase, redemption or other
retirement of, any Parity Shares or Junior Shares, or any warrants, rights,
calls or options to purchase any Parity Shares or Junior Shares, and shall not
permit any corporation or other entity directly or indirectly controlled by the
Company to purchase or redeem any Parity Shares or Junior Shares or any such
warrants, rights, calls or options, unless full cumulative dividends determined
in accordance herewith on the 14% Preferred Shares have been paid (or are deemed
paid) in full.
 
    The Certificate of Designations restricts the Company's ability to incur
certain additional indebtedness.
 
REGISTRATION RIGHTS AGREEMENTS
 
    Each share of the Company's Class B Common Stock is convertible at the
option of the holder thereof, at any time, into one share of Class A Common
Stock. The Company and the current holders of the Company's Class B Common Stock
and the holders of options to purchase Class B Common Stock have entered into a
Registration Rights Agreement (the "Company Registration Rights Agreement"),
which, among other things, will provide that at any time after a Qualifying IPO
(as defined) and upon the request of holders of at least 4% of the outstanding
Class B Common Stock that is subject to the Company Registration Rights
Agreement, the Company will register under the Securities Act any of the shares
of Class A Common Stock currently held by, or to be acquired in the future by,
such holders, for
 
                                       65
<PAGE>
sale in accordance with such holders' intended method of disposition thereof (a
"Demand Registration"). The holders of the Class B Common Stock will have the
right to request two Demand Registrations. The holders of the Class B Common
Stock also will have the right, at any time after the Qualifying IPO, to include
the shares of Class A Common Stock held by them in certain other registrations
of common equity securities of the Company initiated by the Company on its own
behalf or on behalf of its shareholders. The holders' rights under the Company
Registration Rights Agreement are not transferable. In addition, the holders of
Class B Common Stock and options to purchase Class B Common Stock have agreed to
pay their pro rata share of all costs and expenses incurred in connection with
each registration of their respective shares of Class A Common Stock. For
purposes of the Company Registration Rights Agreement, "Qualifying IPO" means a
public offering of Class A Common Stock that results in net proceeds to the
Company of not less than $75,000,000 or such lesser amount as the Board of
Directors of the Company may, in their discretion, determine to be adequate to
commence the rights of the holders under the Company Registration Rights
Agreement.
 
    Pursuant to the terms of the Stock Purchase Agreement dated as of June 6,
1997 (the "Comdisco Agreement") between the Company and Comdisco, Inc., a
Delaware corporation ("Comdisco"), the Company granted Comdisco certain
registration rights with respect to shares of Class A Common Stock issuable to
Comdisco from time to time in consideration of certain services provided by
Comdisco pursuant to a Master Services Agreement dated June 6, 1997 (the "Master
Services Agreement"). The Comdisco Agreement provides that Comdisco has
unlimited "piggyback" registration rights with respect to any registration
statement the Company proposes to file with the Commission to register any of
its Common Stock, subject to certain reductions in the case of an underwritten
offering to the extent the managing underwriter determines that inclusion of all
or a portion of the shares to be included in such registration would adversely
affect the marketability of the offering of the securities to be sold by the
Company. If the Company has included shares in a registration statement pursuant
to Comdisco's "piggyback" registration rights, the Company may not file or cause
to be effected any other registration of any equity securities or securities
convertible into equity securities until a period of 120 days has elapsed from
the date of effectiveness of such previous registration. Subject to minimum size
requirements, Comdisco has agreed that in connection with any underwritten
public offering of the Common Stock, it will not effect any public sale or
distribution of its shares except in connection with a "piggyback" registration
for a period of time requested by the managing underwriter, not to exceed 180
days. The Company has agreed to bear and pay all expenses incurred in connection
with any registration, filing or qualification with respect to a "piggyback"
registration.
 
    The Comdisco Agreement also provides that, commencing on June 6, 2000,
Comdisco has the option to require redemption of all, but not less than all, of
the initial 400,000 shares issued to Comdisco pursuant to the Master Services
Agreement at a purchase price of $11.50 per share, by giving notice to the
Company within 180 days, subject to the right of the Company to suspend such
right if redemption of such shares would violate any law applicable to the
Company or cause any breach by the Company of any material contractual
obligations in effect as of the date of the Comdisco Agreement. The expiration
of such rights shall be extended for the period of time equal to the period of
any such suspension. Comdisco's redemption right terminates upon the closing of
a sale to the public of any class of equity security issued by the Company and
will therefore terminate upon the consummation of the Stock Offering.
 
    In connection with the acquisition of ITC, pursuant to the terms of the
Stock Purchase Agreement dated December 1, 1996, as amended on July 15, 1997
(the "ITC Agreement"), between the Company and the several sellers named therein
(the "Sellers"), the Company has granted to the Sellers certain optional
redemption rights with respect to 1,178,128 shares of Class B Common Stock, or
any shares of Class A Common Stock into which the Sellers' Class B Common Stock
may be converted, for a consideration of $8.79 per share. The Sellers'
redemption rights shall be suspended for a period of not more than 180 days upon
written notice by the Company of its intent to register any class of equity
 
                                       66
<PAGE>
securities. The Sellers' redemption rights terminate if during the three year
period commencing upon the 180th day after the date of this Prospectus, the
average daily closing price of the Class A Common Stock during any consecutive
60 trading day period is greater than $8.79. The Sellers agreed, in connection
with an initial public offering of any class of equity security of the Company
or any of its affiliates, that they will not sell or otherwise transfer Common
Stock for a period equal to that agreed by the officers or directors of the
Company that are not affiliated with Eagle River.
 
DIRECTOR AND OFFICER INDEMNIFICATION
 
    The Washington Business Corporation Act provides that a Washington
corporation may include provisions in its articles of incorporation relieving
each of its directors of monetary liability arising out of his or her conduct as
a director for breach of his or her fiduciary duty except liability for (i) acts
or omissions of a director that involve intentional misconduct or a knowing
violation of law, (ii) conduct in violation of Section 23B.08.310 of the
Washington Business Corporation Act (which section relates to unlawful
distributions) or (iii) any transaction from which a director personally
received a benefit in money, property or services to which the director was not
legally entitled. The Company's Articles include such provisions.
 
    The Company's Articles and Bylaws provide that the Company shall, to the
fullest extent permitted by the Washington Business Corporation Act, as amended
from time to time, indemnify and advance expenses to each of its currently
acting and former directors and officers, and may so indemnify and advance
expenses to each of its current and former employees and agents. The Company
believes the foregoing provisions are necessary to attract and retain qualified
persons as directors and officers.
 
PROVISIONS AFFECTING ACQUISITIONS AND BUSINESS COMBINATIONS
 
    The Washington Business Corporation Act, Section 23B.19 of the Revised Code
of Washington, prohibits a "target corporation," with certain exceptions, from
engaging in certain "significant business transactions" (such as a merger or
sale of assets) with an "acquiring person" who acquires more than 10% of the
voting securities of the target corporation for a period of five years after
such acquisition, unless the transaction is approved by a majority of the
members of the target corporation's board of directors prior to the date of the
significant business transaction or the purchase of the shares made by the
acquiring person or unless the aggregate amount of the cash and the market value
of non-cash consideration received by holders of outstanding shares of any class
or series of stock of the target corporation is equal to certain minimum
amounts. The Company's Articles provide that it will be subject to such
prohibitions and shall remain subject to such prohibitions even if they are ever
repealed. Such prohibitions do not apply to any shareholders who beneficially
own ten percent or more of the Company's outstanding voting securities prior to
the Stock Offering.
 
LISTING
 
    Application has been made to have the Class A Common Stock qualified for
inclusion in the Nasdaq National Market under the proposed symbol "NXLK."
 
TRANSFER AGENT AND REGISTRAR
 
    Continental Stock Transfer & Trust Company will be the transfer agent and
registrar for the Class A Common Stock (the "Transfer Agent").
 
                                       67
<PAGE>
                      DESCRIPTION OF CERTAIN INDEBTEDNESS
 
DESCRIPTION OF THE NEW NOTES
 
    GENERAL.  In the Debt Offering, the Company will issue $200 million
aggregate principal amount of    % Senior Notes due 2007 (the "New Notes")
pursuant to an indenture (the "New Indenture") among the Company and United
States Trust Company of New York, as trustee (the "Trustee").
 
    PRINCIPAL, MATURITY AND INTEREST.  The New Notes are limited in aggregate
principal amount to $200 million and will mature on       , 2007. Interest on
the New Notes accrues at    % per annum and is payable semiannually in arrears
on       and       of each year. Interest is computed on the basis of a 360-day
year comprised of twelve 30-day months.
 
    RANKING.  The New Notes are unsecured senior obligations of the Company,
will rank PARI PASSU in right of payment with all existing and future senior
obligations of the Company, including the 12 1/2% Notes, and will rank senior in
right of payment to all future subordinated obligations of the Company.
 
    REDEMPTION.  The New Notes are not redeemable at the Company's option prior
to       , 2002. Thereafter, the New Notes are subject to redemption at the
option of the Company, in whole or in part, at the redemption prices (expressed
as percentages of principal amount) set forth below plus accrued and unpaid
interest thereon to the applicable redemption date, if redeemed during the
twelve-month period beginning on       of the years indicated below:
 
<TABLE>
<CAPTION>
YEAR                                                                                   PERCENTAGE
- -------------------------------------------------------------------------------------  -----------
<S>                                                                                    <C>
2002.................................................................................
                                                                                       <C>
2003.................................................................................
                                                                                       <C>
2004.................................................................................
                                                                                       <C>
2005 and thereafter..................................................................     100.000%

</TABLE>
 
    In addition, at any time on or before       , 2000, the Company may redeem
up to 33 1/3% of the original aggregate principal amount of the New Notes with
the net proceeds of a sale of common equity at a redemption price equal to    %
of the principal amount thereof, plus accrued and unpaid interest thereon, if
any, to the date of redemption, provided that at least $133 million of aggregate
principal amount of New Notes remains outstanding immediately after such
redemption. Except in connection with a Change of Control (as defined in the New
Indenture) of the Company, the Company is not required to make mandatory
redemption or sinking fund payments with respect to the New Notes.
 
    COVENANTS.  The New Indenture restricts, among other things, the Company's
ability to incur additional indebtedness, pay dividends or make certain other
restricted payments, incur certain liens to secure PARI PASSU or subordinated
indebtedness, engage in any sale and leaseback transaction, sell assign,
transfer, lease, convey or otherwise dispose of substantially all of the assets
of the Company, enter into certain transactions with affiliates, or incur
indebtedness that is subordinate in right of payment to any senior indebtedness
and senior in right of payment to the New Notes. The New Indenture permits,
under certain circumstances, the Company's subsidiaries to be deemed
unrestricted subsidiaries and thus not subject to the restrictions of the
indenture.
 
    EVENTS OF DEFAULT.  The New Indenture contains standard events of default,
including (i) defaults in the payment of principal, premium or interest, (ii)
defaults in the compliance with covenants contained in the indenture, (iii)
cross defaults on more than $10 million of other indebtedness, (iv) failure to
pay more than $10 million of judgments and (v) certain events of its
subsidiaries.
 
                                       68
<PAGE>
DESCRIPTION OF THE 12 1/2% NOTES
 
    GENERAL.  The Company and NEXTLINK Capital, Inc., a Washington corporation
and a wholly owned subsidiary of the Company ("Capital" and, together with the
Company, the "Issuers") issued $350 million of 12 1/2% Senior Notes Due April
15, 2006 pursuant to an Indenture among the Company, Capital and United States
Trust Company of New York, as trustee (the "Trustee"). On September 6, 1996, the
Company consummated an offer (the "Exchange Offer") to exchange such notes for
$350 million of 12 1/2% Senior Notes Due April 15, 2006 that had been registered
under the Securities Act.
 
    PRINCIPAL, MATURITY AND INTEREST.  The 12 1/2% Notes are limited in
aggregate principal amount to $350 million and will mature on April 15, 2006.
Interest on the 12 1/2% Notes accrues at 12 1/2% per annum and is payable
semiannually in arrears on April 15 and October 15 of each year. Interest is
computed on the basis of a 360-day year comprised of twelve 30-day months. At
the closing of the offering, the Company used $117.7 million of the net proceeds
of the offering of the 12 1/2% Notes to purchase a portfolio of securities,
initially consisting of U.S. government securities (including any securities
substituted in respect thereof, the "Pledged Securities"), to pledge as security
for payment of interest on the 12 1/2% Notes through April 15, 1999 and, under
certain circumstances, as security for repayment of the principal of the 12 1/2%
Notes. Proceeds from the Pledged Securities may be used by the Company to make
interest payments on the 12 1/2% Notes through April 15, 1999. The Pledged
Securities are being held by the Trustee pending disbursement.
 
    RANKING.  The 12 1/2% Notes are unsecured senior obligations of the Issuers,
will rank PARI PASSU in right of payment with all existing and future senior
obligations of the Issuers, including the New Notes, and will rank senior in
right of payment to all future subordinated obligations of the Issuers.
 
    REDEMPTION.  The 12 1/2% Notes are not redeemable at the Company's option
prior to April 15, 2001. Thereafter, the 12 1/2% Notes are subject to redemption
at the option of the Company, in whole or in part, at the redemption prices
(expressed as percentages of principal amount) set forth below plus accrued and
unpaid interest thereon to the applicable redemption date, if redeemed during
the twelve-month period beginning on April 15 of the years indicated below:
 
<TABLE>
<CAPTION>
YEAR                                                                                   PERCENTAGE
- -------------------------------------------------------------------------------------  -----------
<S>                                                                                    <C>
2001.................................................................................     106.250%
2002.................................................................................     104.167%
2003.................................................................................     102.083%
2004 and thereafter..................................................................     100.000%
</TABLE>
 
    In addition, at any time on or before March 15, 1999, the Company may redeem
up to 33 1/3% of the original aggregate principal amount of the 12 1/2% Notes
with the net proceeds of a sale of common equity at a redemption price equal to
112.50% of the principal amount thereof, plus accrued and unpaid interest
thereon, if any, to the date of redemption, provided that at least $175 million
of aggregate principal amount of 12 1/2% Notes remains outstanding immediately
after such redemption. Except in connection with a Change of Control (as defined
in the indenture relating to the 12 1/2% Notes) of the Company, the Issuers are
not required to make mandatory redemption or sinking fund payments with respect
to the 12 1/2% Notes.
 
    COVENANTS.  The indenture relating to the 12 1/2% Notes restricts, among
other things, the Company's ability to incur additional indebtedness, pay
dividends or make certain other restricted payments, incur certain liens to
secure PARI PASSU or subordinated indebtedness, engage in any sale and leaseback
transaction, sell assign, transfer, lease, convey or otherwise dispose of
substantially all of the assets of the Company, enter into certain transactions
with affiliates, or incur indebtedness that is subordinate in right of payment
to any senior indebtedness and senior in right of payment to the 12 1/2% Notes.
The
 
                                       69
<PAGE>
indenture relating to the 12 1/2% Notes permits, under certain circumstances,
the Company's subsidiaries to be deemed unrestricted subsidiaries and thus not
subject to the restrictions of the indenture.
 
    EVENTS OF DEFAULT.  The indenture relating to the 12 1/2% Notes contains
standard events of default, including (i) defaults in the payment of principal,
premium or interest, (ii) defaults in the compliance with covenants contained in
the indenture, (iii) cross defaults on more than $10 million of other
indebtedness, (iv) failure to pay more than $10 million of judgments and (v)
certain events of its subsidiaries.
 
                                       70
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
    Upon completion of the Stock Offering, the Company will have outstanding
      shares of Class A Common Stock, excluding       shares of Class A Common
Stock which have been granted under the Plan but have not vested, assuming that
the Underwriters' over-allotment option is not exercised. Of these shares, the
      shares of Class A Common Stock sold in the Stock Offering will be freely
tradable without restriction or further registration under the Securities Act,
except for any Shares purchased by an Affiliate of the Company, which will be
subject to the limitations of Rule 144 ("Rule 144") under the Securities Act.
 
    In general, under Rule 144 as currently in effect, a person (or persons
whose shares are aggregated) who has beneficially owned his or her restricted
securities (as that term is defined in Rule 144) for at least one year from the
date such securities were acquired from the Company or an affiliate of the
Company would be entitled to sell within any three-month period a number of
shares that does not exceed the greater of (i) one percent of the then
outstanding shares of the Common Stock and (ii) the average weekly trading
volume of the common stock during the four calendar weeks preceding a sale by
such person. Sales under Rule 144 are also subject to certain manner-of-sale
provisions, notice requirements and the availability of current public
information about the Company. Under Rule 144, however, a person who has held
shares for a minimum of two years from the later of the date such securities
were acquired from the Company or an affiliate of the Company and who is not,
and for the three months prior to the sale of such shares has not been, an
affiliate of the Company, is free to sell such shares without regard to the
volume, manner-of-sale and certain other limitations contained in Rule 144.
Ninety days after the completion of the Stock Offering,       shares of Class A
Common Stock will be freely tradable without restriction under the Securities
Act.
 
    On April 25, 1997, the Company filed a registration statement on Form S-8
(File No. 333-25907) to register 10,000,000 shares of Class A Common Stock
reserved for issuance or sale under the Plan. Upon completion of the Stock
Offering, there will be outstanding options to purchase a total of       shares
of Class A Common Stock of which       shares of Class A Common Stock are
subject to vested options. All such shares of Class A Common Stock issuable upon
the exercise of options under the Plan are freely tradable without restriction
under the Securities Act, unless such shares are held by an Affiliate of the
Company.
 
    The Company, its directors and its executive officers, who hold in the
aggregate       shares of Class A Common Stock (or currently exercisable options
to purchase Class A Common Stock) and       shares of Class B Common Stock (or
currently exercisable options to purchase Class B Common Stock), have agreed not
to offer, sell or contract to sell, or otherwise dispose of, directly or
indirectly, or announce an offering of, any shares of Class A Common Stock or
any securities convertible into, or exchangeable for, shares of Class A Common
Stock for a period of 180 days from the date of this Prospectus, without the
prior written consent of Salomon Brothers Inc, except, except under limited
circumstances.
 
    In addition, the Company has granted certain holders of its capital stock
rights to require the registration for sale of such capital stock under the
Securities Act. See "Description of Capital Stock -- Registration Rights."
 
    Prior to the Stock Offering, there has been no established market for the
Common Stock and no predictions can be made about the effect, if any, that
market sales of shares of Class A Common Stock or the availability of such
shares for sale will have on the market price prevailing from time to time.
Nevertheless, the actual sale of, or the perceived potential for the sale of,
Class A Common Stock in the public market may have an adverse effect on the
market price for the Class A Common Stock.
 
                                       71
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions set forth in an underwriting agreement
among the Company and the U.S. Underwriters (the "U.S. Underwriting Agreement"),
the Company has agreed to sell to each of the U.S. Underwriters named below (the
"U.S. Underwriters"), for whom Salomon Brothers Inc, Merrill Lynch, Pierce,
Fenner & Smith Incorporated, Bear, Stearns & Co. Inc. and Lazard Freres & Co.
LLC are acting as representatives (the "Representatives"), and each of the U.S.
Underwriters has severally agreed to purchase from the Company the aggregate
number of shares of Class A Common Stock set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                                                          NUMBER OF
U.S. UNDERWRITERS                                                                          SHARES
- ---------------------------------------------------------------------------------------  -----------
<S>                                                                                      <C>
Salomon Brothers Inc ..................................................................
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated.................................................................
Bear, Stearns & Co. Inc................................................................
Lazard Freres & Co. LLC................................................................
 
    Total..............................................................................
                                                                                         -----------
                                                                                         -----------
                                                                                         -----------
</TABLE>
 
    The Company has been advised by the Representatives that the several U.S.
Underwriters propose initially to offer the shares of Class A Common Stock to
the public at the public offering price set forth on the cover page of this
Prospectus, and to certain dealers at such price less a concession not in excess
of $    per share. The U.S. Underwriters may allow, and such dealers may
reallow, a concession not in excess of $    per share to certain other dealers.
After the initial public offering, the public offering price and such
concessions may be changed.
 
    The Company has granted the U.S. Underwriters and the international
underwriters (the "International Underwriters" and, collectively with the U.S.
Underwriters, the "Underwriters") an option, exercisable within 30 days of the
date of this Prospectus, to purchase up to       additional shares of Class A
Common Stock to cover over-allotments, if any, at the price to the public set
forth on the cover page of this Prospectus less the Underwriting Discount. To
the extent that the Underwriters exercise such option, in whole or in part, each
Underwriter will have a firm commitment, subject to certain conditions, to
purchase a number of option shares proportionate to such Underwriter's initial
commitment.
 
                                       72
<PAGE>
    The Company has entered into an International Underwriting Agreement with
the International Underwriters named therein, for whom Salomon Brothers
International Limited, Merrill Lynch International, Bear, Stearns International
Limited and Lazard Capital Markets are acting as the representatives (the
"International Representatives," and together with the U.S. Representatives, the
"Representatives"), providing for the concurrent offer and sale of       shares
of Class A Common Stock (in addition to the shares covered by the over-allotment
option described above) outside the United States and Canada. Both the U.S.
Underwriting Agreement and the International Underwriting Agreement provide that
the obligations of the U.S. Underwriters and the International Underwriters are
such that if any of the shares of Class A Common Stock are purchased by the U.S.
Underwriters pursuant to the U.S. Underwriting Agreement, or by the
International Underwriters pursuant to the International Underwriting Agreement,
all the shares of Class A Common Stock agreed to be purchased by either the U.S.
Underwriters or the International Underwriters, as the case may be, pursuant to
their respective agreements must be so purchased. The price to public and
underwriting discount per share of Class A Common Stock for the U.S. Stock
Offering and the International Stock Offering will be identical. The closing of
the International Stock Offering is a condition to the closing of the U.S. Stock
Offering and the closing of the U.S. Stock Offering is a condition to the
closing of the International Stock Offering.
 
    Each U.S. Underwriter has severally agreed that, as part of the distribution
of the       shares of Class A Common Stock offered by the U.S. Underwriters,
(i) it is not purchasing any shares of Class A Common Stock for the account of
anyone other than a United States or Canadian Person and (ii) it has not offered
or sold, and will not offer or sell, directly or indirectly, any shares of Class
A Common Stock or distribute this Prospectus to any person outside the United
States or Canada or to anyone other than a United States or Canadian Person.
Each International Underwriter has severally agreed that, as part of the
distribution of the       shares of Common Stock by the International
Underwriters, (i) it is not purchasing any shares of Class A Common Stock for
the account of any United States or Canadian Person, and (ii) it has not offered
or sold, and will not offer or sell, directly or indirectly, any shares of Class
A Common Stock or distribute any Prospectus relating to the International
Offering to any person within the United States or Canada or to any United
States or Canadian person.
 
    The foregoing limitations do not apply to stabilization transactions or to
certain other transactions specified in the Agreement Between U.S. Underwriters
and International Underwriters "United States or Canadian Person" means any
person who is a national or resident of the United States or Canada, any
corporation, partnership or other entity created or organized in or under the
laws of the United States or Canada or of any political subdivision thereof, and
any estate or trust which is subject to United States or Canadian federal income
taxation, regardless of the source of its income (other than the foreign branch
of any United States or Canadian Person), and includes any United States or
Canadian branch of a person other than a United States or Canadian Person.
 
    Pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, sales may be made between the U.S. Underwriters and International
Underwriters of such number of shares of Class A Common Stock as may be mutually
agreed. The price of any shares of Class A Common Stock so sold shall be the
public offering price, less an amount not greater than the concession to
securities dealers. To the extent that there are sales between the U.S.
Underwriters and the International Underwriters pursuant to the Agreement
Between U.S. Underwriters and International Underwriters, the number of shares
of Class A Common Stock initially available for sale by the U.S. Underwriters or
by the International Underwriters may be more or less than the amount specified
on the cover page of this Prospectus.
 
    Any offer of the shares of Class A Common Stock in Canada will be made only
pursuant to an exemption from the registration and qualification requirements in
any jurisdiction in Canada in which such offer is made.
 
    The U.S. Underwriting Agreement provides that the Company will indemnify the
several U.S. Underwriters against certain liabilities, including liabilities
under the Securities Act, or contribute to payments the U.S. Underwriters may be
required to make in respect thereof.
 
                                       73
<PAGE>
    The Company, its directors, executive officers and certain stockholders have
each agreed with the Underwriters that they will not offer, sell or contract to
sell, or otherwise dispose of, directly or indirectly, or announce an offering
of, any shares of Class A Common Stock or any securities convertible into, or
exchangeable for, shares of Class A Common Stock for a period of 180 days from
the date of this Prospectus, without the prior written consent of Salomon
Brothers Inc, except (a) in the case of the Company, (i) grants of options and
issuances and sales of Class A Common Stock issued pursuant to any employee or
director stock option plan, stock ownership plan or stock purchase plan in
effect on the date of the Underwriting Agreement, (ii) issuances of Class A
Common Stock upon the conversion of securities or the exercise of warrants
outstanding on the date of the Underwriting Agreement, (iii) issuance of Class B
Common Stock upon exercise of options outstanding on the date of the
Underwriting Agreement, (iv) issuance of Common Stock pursuant to agreements in
effect on the date of the Underwriting Agreement, (which issuances will not
involve the issuance of a material amount of shares Common Stock) or (v)
issuance of Common Stock in connection with acquisitions; provided that the
recipients of such shares of Common Stock agree in writing with Salomon Brothers
Inc to be bound by the unexpired term of this agreement not to sell; and (b) in
the case of directors, executive officers and stockholders of the Company,
shares of Class A Common Stock disposed of as bona fide gifts or pledges where
the recipients of such gifts or the pledgees, as the case may be, agree in
writing with Salomon Brothers Inc to be bound by the terms of such agreement.
 
    The Representatives have informed the Company that they do not expect sales
to accounts over which they exercise discretionary authority to exceed five
percent of the total number of shares of Class A Common Stock sold in the Stock
Offering.
 
    Prior to the Stock Offering, there has been no public market for the Class A
Common Stock. The initial public offering price will be negotiated among the
Company and the Representatives. Among the factors considered in determining the
initial public offering price of the Class A Common Stock, in addition to
prevailing market conditions, will be the Company's historical performance,
estimates of the business potential and earnings prospects of the Company, an
assessment of the Company's management and the consideration of the above
factors in relation to market valuation of companies in related businesses.
There can be no assurance that the price at which shares of Class A Common Stock
will sell in the public market after the Stock Offering will not be lower than
the price at which they are sold in the Stock Offering by the Underwriters.
 
    Application has been made to have the Class A Common Stock qualified for
inclusion in the Nasdaq National Market under the symbol "NXLK."
 
    In connection with the Stock Offering, the Underwriters may purchase and
sell the Class A Common Stock in the open market in accordance with Regulation M
under the Exchange Act. These transactions may include over-allotment and
stabilizing transactions and purchase to cover syndicate short positions created
in connection with the Stock Offering. Stabilizing transactions consist of
certain bids or purchases for the purpose of preventing or retarding a decline
in the market price of the Class A Common Stock; and syndicate short positions
involve the sale by the Underwriters of a greater number of shares of Class A
Common Stock than they are required to purchase from the Company in the Stock
Offering. The Underwriters also may impose a penalty bid, whereby selling
concessions allowed to syndicate members or other broker-dealers in respect of
the securities sold in the Stock Offering for their account may be reclaimed by
the syndicate if such securities are repurchased by the syndicate in stabilizing
or covering transactions. These activities may stabilize, maintain or otherwise
affect the market price of the Class A Common Stock, which may be higher than
the price that might otherwise prevail in the open market; and these activities,
if commenced, may be discontinued at any time. These transactions may be
effected on the Nasdaq National Market in the over-the-counter market or
otherwise.
 
                               VALIDITY OF SHARES
 
    The validity of the Class A Common Stock will be passed upon for the Company
by Willkie Farr & Gallagher, New York, New York and for the Underwriters by
Sullivan & Cromwell, New York, New York. As to matters of Washington law,
Willkie Farr & Gallagher and Sullivan & Cromwell will rely upon the opinion of
Davis Wright Tremaine LLP, Seattle, Washington.
 
                                       74
<PAGE>
                                    EXPERTS
 
    The audited financial statements included in this Prospectus have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.
 
                             AVAILABLE INFORMATION
 
    The Company has filed with the Commission, Washington, D.C. 20549, a
Registration Statement on Form S-1, Commission File No. 333-      , under the
Securities Act with respect to the shares of Class A Common Stock offered by the
Stock Offering. This Prospectus, which is part of the Registration Statement,
does not contain all of the information set forth in the Registration Statement
and the exhibits and schedules thereto. For further information with respect to
the Company and the Class A Common Stock, reference is made to the Registration
Statement and the exhibits and schedules filed therewith. Statements contained
in this Prospectus as to the contents of any contract or any other document to
which reference is made are necessarily summaries thereof, and in each instance
reference is made to the copy of such contract or other document filed as an
exhibit to the Registration Statement, each such statement being qualified in
all respects by such reference.
 
    NEXTLINK is subject to the informational requirements of the Securities
Exchange Act of 1934 (the "Exchange Act") and in accordance therewith files
reports and other information with the Commission. Copies of the Registration
Statement, periodic reports and other information filed by the Company with the
Commission may be inspected at prescribed rates at the public reference
facilities maintained by the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. 20549, or at its regional offices located at Northwestern
Atrium Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and
Seven World Trade Center, Suite 1300, New York, New York 10048. In addition, the
Commission maintains a website that contains periodic reports and other
information filed by the Company via the Commission's Electronic Data Gathering
and Retrieval System (EDGAR). This website can be accessed at www.sec.gov.
Copies of such material can be also be obtained from the Company upon request by
contacting the Company at its principal executive office.
 
    The Company intends to furnish its shareholders with annual reports
containing financial statements audited by an independent public accounting firm
and quarterly reports for the first three quarters of each fiscal year
containing unaudited interim financial information.
 
                                       75
<PAGE>
                                                       ANNEX A TO THE PROSPECTUS
 
                                    GLOSSARY
 
    CAP (COMPETITIVE ACCESS PROVIDER)--A company that provides its customers
with an alternative to the ILEC for local private line and special access
telecommunications services.
 
    CENTRAL OFFICES--The switching centers or central switching facilities of
the LECs.
 
    CLEC (Competitive local exchange carrier)--A company providing local
telephone services in competition with the ILEC.
 
    CO-CARRIER STATUS--A regulatory scheme under which the ILEC is required to
integrate new, competing providers of local exchange service, such as the
Company, into the systems of traffic exchange, inter-carrier compensation, and
other inter-carrier relationships that already exist among ILECs in most
jurisdictions.
 
    COLLOCATION--The ability of a CLEC such as the Company to connect its
network to the ILECs central offices. Physical collocation occurs when a CLEC
places its network connection equipment inside the ILEC's central offices.
Virtual collocation is an alternative to physical collocation pursuant to which
the ILEC permits a CLEC to connect its network to the ILEC's central offices on
comparable terms, even though the CLEC's network connection equipment is not
physically located inside the central offices.
 
    DARK FIBER--Unused fiber through which no light is transmitted. Dark fiber
is provided with the customer expected to supply the required electronics and
signals.
 
    DEDICATED--Telecommunications lines dedicated or reserved for use by
particular customers and charged on a flat, usually monthly basis.
 
    DIGITAL--A method of storing, processing and transmitting information
through the use of distinct electronic or optical pulses that represent the
binary digits 0 and 1. Digital transmission and switching technologies employ a
sequence of these pulses to represent information as opposed to the continuously
variable analog signal. The precise digital numbers minimize distortion (such as
graininess or snow in the case of video transmission, or static or other
background distortion in the case of audio transmission).
 
    DS-0, DS-1, DS-3--The standard circuit capacity classifications. Each of
these transmission services can be provided using the same type of fiber optic
cable, but offer different bandwidth (that is, capacity), depending upon the
individual needs of the end-user. A DS-0 is a dedicated circuit that is
considered to meet the requirements of usual business communications, with
transmission capacity of up to 64 kilobits of bandwidth per second (that is, a
voice grade equivalent circuit). This service offers a basic low capacity
dedicated digital line for connecting telephones, fax machines, personal
computers and other telecommunications equipment. A DS-1 is a high speed digital
circuit typically linking high volume customer locations to long distance
carriers or other customer locations. Typically utilized for voice transmissions
as well as the interconnection of LANs, DS-1 service accommodates transmission
speeds of up to 1.544 megabits per second, which is the equivalent of 24 voice
grade equivalent circuits. DS-3 service provides a very high capacity digital
circuit with transmission capacity of 45 megabits per second, which is
equivalent to 28 DS-1 circuits or 672 voice grade equivalent circuits. This is a
digital service used by long distance carriers for central office connections
and by some large commercial users to link multiple sites.
 
    ETHERNET--A local area network technology used for connecting computers,
printers, workstations, terminals, etc., within the same building. Ethernet
operates over twisted wire or coaxial cable at speeds up to 100 megabits per
second. Ethernet is the most popular LAN technology.
 
    FCC--The United States Federal Communications Commission.
 
                                      A-1
<PAGE>
    FDDI (FIBER DISTRIBUTED DATA INTERFACE)--Based on fiber optics, FDDI is a
100 megabit per second local area network technology used to connect computers,
printers, and workstations at very high speeds. FDDI is also used as backbone
technology to interconnect other LANs.
 
    FIBER MILE--The number of route miles installed (excluding pending
installations) along a telecommunications path multiplied by the number of
fibers along that path. See the definition of "route mile" below.
 
    ILEC (incumbent local exchange carrier) --A company providing local
telephone services.
 
    INTERCONNECTION DECISIONS--Rulings by the FCC announced in September 1992
and August 1993, which require the RBOCs and most other large ILECs to provide
interconnection in ILEC central offices to any CAP, long distance carrier or
end-user seeking such interconnection for the provision of interstate special
access and switched access transport services.
 
    KILOBIT--One thousand bits of information. The information-carrying capacity
(i.e., bandwidth) of a circuit may be measured in "kilobits per second." One
kilobit is approximately sufficient to encode a standard telegram.
 
    LANS (LOCAL AREA NETWORKS)--The interconnection of computers for the purpose
of sharing files, programs and various devices such as printers and high-speed
modems. LANs may include dedicated computers or file servers that provide a
centralized source of shared files and programs.
 
    LOCAL EXCHANGE--A geographic area determined by the appropriate state
regulatory authority in which calls generally are transmitted without toll
charges to the calling or called party.
 
    LINE--an electrical path between a ILEC central office and a subscriber.
 
    LONG DISTANCE CARRIERS (INTEREXCHANGE CARRIERS)--Long distance carriers
provide services between local exchanges on an interstate or intrastate basis. A
long distance carrier may offer services over its own or another carrier's
facilities.
 
    MEGABIT--One million bits of information. The information-carrying capacity
(i.e., bandwidth) of a circuit may be measured in "megabits per second." One
megabit is approximately sufficient to encode a 3 inch by 5 inch photograph.
 
    NUMBER PORTABILITY--The ability of an end-user to change local exchange
carriers while retaining the same telephone number.
 
    POPS (POINTS OF PRESENCE)--Locations where a long distance carrier has
installed transmission equipment in a service area that serves as, or relays
calls to, a network switching center of that long distance carrier.
 
    PUC (PUBLIC UTILITY COMMISSION)--A state regulatory body, established in
most states, which regulates utilities, including telephone companies providing
intrastate services.
 
    PRIVATE LINE--A dedicated telecommunications connection between end-user
locations.
 
    PUBLIC SWITCHED NETWORK--That portion of a ILEC's network available to all
users generally on a shared basis (i.e., not dedicated to a particular user).
Traffic along the public switched network is generally switched at the ILEC's
central offices.
 
    RECIPROCAL COMPENSATION--The compensation paid to and from a new competitive
local exchange carrier and the ILEC for termination of a local call on each
other's networks.
 
    ROUTE MILE--The number of miles of the telecommunications path in which the
Company-owned or leased fiber optic cables are installed.
 
                                      A-2
<PAGE>
    SPECIAL ACCESS SERVICES--The lease of private, dedicated telecommunications
lines or "circuits" along the network of a ILEC or a CAP, which lines or
circuits run to or from the long distance carrier POPs. Examples of special
access services are telecommunications lines running between POPs of a single
long distance carrier, from one long distance carrier POP to the POP of another
long distance carrier or from an end-user to a long distance carrier POP.
 
    SWITCH--A device that opens or closes circuits or selects the paths or
circuits to be used for transmission of information. Switching is a process of
interconnecting circuits to form a transmission path between users.
 
    SWITCHED ACCESS SERVICES--Transmission of switched calls through the local
switched network for the purpose of originating or terminating toll calls. Long
distance companies pay switched access charges to the ILECs for each switched
call originated or terminated on the ILEC's network.
 
    Switched access transport services--Transportation of switched traffic along
dedicated lines between the ILEC central offices and long distance carrier POPs.
 
    SWITCHED TRAFFIC--Telecommunications traffic along the public switched
network that is charged on a per-minute or other range sensitive basis. This
traffic is generally switched at the ILEC's central offices.
 
    TOKEN RING--A local area network technology used to interconnect personal
computers, file servers, printers, and other devices. Token Ring LANs typically
operate at either 4 megabits per second or 16 megabits per second.
 
                                      A-3
<PAGE>
                 NEXTLINK COMMUNICATIONS, INC. AND SUBSIDIARIES
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS
 
<S>                                                                                    <C>
Consolidated Balance Sheet as of March 31, 1997......................................        F-2
 
Consolidated Statements of Operations for the Three Months Ended March 31, 1996 and
  1997...............................................................................        F-3
 
Consolidated Statement of Changes in Shareholders' Deficit for the Three Months Ended
  March 31, 1997.....................................................................        F-4
 
Consolidated Statements of Cash Flows for the Three Months Ended March 31, 1996 and
  1997...............................................................................        F-5
 
Notes to Interim Consolidated Financial Statements...................................        F-6
 
AUDITED CONSOLIDATED FINANCIAL STATEMENTS
 
Report of Independent Public Accountants.............................................       F-10
 
Consolidated Balance Sheets as of December 31, 1995 and 1996.........................       F-11
 
Consolidated Statements of Operations for the Period from Inception (September 16,
  1994) to December 31, 1994, and for the Years Ended December 31, 1995 and 1996.....       F-12
 
Consolidated Statements of Changes in Members' Equity (Deficit) for the Period from
  Inception (September 16, 1994) to December 31, 1994, and for the Years Ended
  December 31, 1995 and 1996.........................................................       F-13
 
Consolidated Statements of Cash Flows for the Period from Inception (September 16,
  1994) to December 31, 1994, and for the Years Ended December 31, 1995 and 1996.....       F-14
 
Notes to Consolidated Financial Statements...........................................       F-16
 
SOUND RESPONSE CORPORATION
 
Report of Independent Public Accountants.............................................       F-28
 
Statements of Operations For the Years Ended December 31, 1993 and 1994, and for the
  Eight Months ended August 31, 1995.................................................       F-29
 
Notes to Financial Statements........................................................  F-30
</TABLE>
 
                                      F-1
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
                           CONSOLIDATED BALANCE SHEET
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                                      MARCH 31,
                                                                                                         1997
                                                                                                    --------------
<S>                                                                                                 <C>
            ASSETS
Current assets:
    Cash and cash equivalents.....................................................................    $  221,934
    Marketable securities.........................................................................       107,348
    Accounts receivable, net......................................................................         8,782
    Other.........................................................................................         1,240
    Pledged securities............................................................................        41,417
                                                                                                    --------------
        Total current assets......................................................................       380,721
Pledged securities................................................................................        61,486
Property and equipment, net.......................................................................       125,000
Goodwill, net.....................................................................................        54,523
Other intangible assets, net......................................................................        10,465
Other assets, net.................................................................................        17,512
                                                                                                    --------------
        Total assets..............................................................................    $  649,707
                                                                                                    --------------
                                                                                                    --------------
    LIABILITIES AND SHAREHOLDERS' DEFICIT
Current liabilities:
    Accounts payable..............................................................................    $   15,198
    Accrued expenses..............................................................................         5,549
    Accrued interest payable......................................................................        20,187
    Current portion of capital lease obligations..................................................         1,149
    Payable to affiliate..........................................................................         1,500
                                                                                                    --------------
        Total current liabilities.................................................................        43,583
Long-term debt....................................................................................       350,000
Capital lease obligations.........................................................................         5,879
Deferred compensation.............................................................................        11,109
Other.............................................................................................         3,051
                                                                                                    --------------
        Total liabilities.........................................................................       413,622
Commitments and contingencies
Minority interests................................................................................           212
Redeemable preferred stock (par value $0.01 per share, aggregate liquidation preference $291,650;
  5,700,000 shares issued and outstanding)........................................................       280,803
Class B common stock, subject to redemption (par value $0.01 per share, 1,178,128 shares issued
  and outstanding)................................................................................         4,950
Shareholders' deficit:
    Class A common stock (par value $0.01 per share, 250,000,000 shares authorized and 0 shares
     issued and outstanding)......................................................................        --
    Class B common stock (par value $0.01 per share, stated at amounts paid in, 100,000,000 shares
     authorized, 81,944,956 shares issued and outstanding)........................................        65,527
    Accumulated deficit...........................................................................      (115,407)
                                                                                                    --------------
        Total shareholders' deficit...............................................................       (49,880)
                                                                                                    --------------
        Total liabilities and shareholders' deficit...............................................    $  649,707
                                                                                                    --------------
                                                                                                    --------------
</TABLE>
 
 See accompanying notes to unaudited interim consolidated financial statements.
 
                                      F-2
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                             THREE MONTHS ENDED
                                                                                                 MARCH 31,
                                                                                           ----------------------
<S>                                                                                        <C>         <C>
                                                                                              1996        1997
                                                                                           ----------  ----------
Revenues.................................................................................  $    5,370  $   10,067
 
Costs and expenses:
  Operating..............................................................................       4,696       9,904
  Selling, general and administrative....................................................       5,516      13,274
  Deferred compensation..................................................................      --             892
  Depreciation...........................................................................       1,077       2,848
  Amortization of intangible assets......................................................         752       1,558
                                                                                           ----------  ----------
      Total costs and expenses...........................................................      12,041      28,476
                                                                                           ----------  ----------
Loss from operations.....................................................................      (6,671)    (18,409)
Interest income..........................................................................         242       5,029
Interest expense.........................................................................        (736)    (11,139)
                                                                                           ----------  ----------
Loss before minority interests...........................................................      (7,165)    (24,519)
Minority interests in loss of consolidated subsidiaries..................................          49          96
                                                                                           ----------  ----------
Net loss.................................................................................  $   (7,116) $  (24,423)
                                                                                           ----------  ----------
                                                                                           ----------  ----------
Pro Forma:...............................................................................
  Net loss per share.....................................................................              $
                                                                                                       ----------
                                                                                                       ----------
  Shares used in computation of pro forma net loss per share.............................
                                                                                                       ----------
                                                                                                       ----------
</TABLE>
 
 See accompanying notes to unaudited interim consolidated financial statements.
 
                                      F-3
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
           CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' DEFICIT
                   FOR THE THREE MONTHS ENDED MARCH 31, 1997
                             (DOLLARS IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                             COMMON       ACCUMULATED      MEMBERS'
                                                              STOCK         DEFICIT         CAPITAL      TOTAL
                                                           -----------  ----------------  -----------  ----------
<S>                                                        <C>          <C>               <C>          <C>
Balance at December 31, 1996.............................   $  --         $    (84,181)    $  65,527   $  (18,654)
  Merger of NEXTLINK Communications,
    L.L.C. with and into NEXTLINK Communications,
    Inc. ................................................      65,527          --            (65,527)      --
  Cumulative redeemable preferred
    stock dividends......................................      --               (6,650)       --           (6,650)
  Accretion of preferred stock redemption obligation,
    including issue costs................................      --                 (153)       --             (153)
  Net loss...............................................      --              (24,423)       --          (24,423)
                                                           -----------  ----------------  -----------  ----------
Balance at March 31, 1997................................   $  65,527     $   (115,407)    $  --       $  (49,880)
                                                           -----------  ----------------  -----------  ----------
                                                           -----------  ----------------  -----------  ----------
</TABLE>
 
 See accompanying notes to unaudited interim consolidated financial statements.
 
                                      F-4
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                             THREE MONTHS ENDED
                                                                                                 MARCH 31,
                                                                                          ------------------------
<S>                                                                                       <C>          <C>
                                                                                             1996         1997
                                                                                          -----------  -----------
OPERATING ACTIVITIES:
Net loss................................................................................  $    (7,116) $   (24,423)
Adjustments to reconcile net loss to net cash used in operating activities:
    Deferred compensation expense.......................................................      --               892
    Equity in loss of affiliates........................................................      --               495
    Depreciation and amortization of intangible assets..................................        1,829        4,406
    Minority interests in loss of consolidated subsidiaries.............................          (49)         (96)
Changes in assets and liabilities, net of effects from acquisitions:
    Accounts receivable.................................................................       (1,670)      (1,756)
    Other current assets................................................................         (105)      (1,875)
    Other long-term assets..............................................................       (1,087)        (359)
    Accounts payable....................................................................        1,896       (2,073)
    Accrued expenses....................................................................          561         (271)
    Accrued interest payable............................................................      --            10,937
                                                                                          -----------  -----------
                                                                                                1,375       10,300
                                                                                          -----------  -----------
Net cash used in operating activities...................................................       (5,741)     (14,123)
 
INVESTING ACTIVITIES:
    Purchase of property and equipment..................................................       (7,791)     (17,648)
    Net assets acquired in business and asset acquisitions (net of cash acquired).......       (9,598)     (41,239)
    Cash withdrawn from escrow to be used in business acquisition.......................      --             6,000
    Investments in unconsolidated affiliates............................................      --            (1,800)
    Purchase of marketable securities, net..............................................      --           (59,635)
                                                                                          -----------  -----------
Net cash used in investing activities...................................................      (17,389)    (114,322)
 
FINANCING ACTIVITIES:
    Net proceeds from issuance of redeemable preferred stock............................      --           274,000
    Capital contributions...............................................................        9,872      --
    Proceeds from payable to affiliates.................................................       28,531      --
    Repayment of capital lease obligations..............................................      --              (428)
    Bank overdraft......................................................................       (1,373)     --
                                                                                          -----------  -----------
Net cash provided by financing activities...............................................       37,030      273,572
                                                                                          -----------  -----------
Net increase in cash and cash equivalents...............................................       13,900      145,127
Cash and cash equivalents, beginning of period..........................................        1,350       76,807
                                                                                          -----------  -----------
Cash and cash equivalents, end of period................................................  $    15,250  $   221,934
                                                                                          -----------  -----------
                                                                                          -----------  -----------
SUPPLEMENTAL CASH FLOW DISCLOSURES:
    Cash paid for interest..............................................................  $       256  $       244
                                                                                          -----------  -----------
                                                                                          -----------  -----------
</TABLE>
 
 See accompanying notes to unaudited interim consolidated financial statements.
 
                                      F-5
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
 
               NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
1. BASIS OF PRESENTATION:
 
    The consolidated financial statements include the accounts of NEXTLINK
Communications, Inc., a Washington corporation, and its majority-owned
subsidiaries (collectively referred to as the Company). The Company, through
predecessor entities, was formed on September 16, 1994 and, through its
subsidiaries, provides competitive local telecommunications services in selected
markets in the United States. The Company is a majority-owned subsidiary of
Eagle River Investments, L.L.C. (Eagle River).
 
    The Company's financial statements include 100% of the assets, liabilities
and results of operations of subsidiaries in which the Company has a controlling
interest of greater than 50%. The ownership interests of the other members or
partners in such subsidiaries are reflected as minority interests. The Company's
investment in Telecommunications of Nevada, L.L.C. (Nevada), a limited liability
company in which the Company has a 40% interest and which operates a network
that is managed by the Company in Las Vegas, Nevada, is accounted for on the
equity method. Investments in entities in which the Company has voting interests
of not more than 20% are accounted for on the cost method. All significant
intercompany accounts and transactions have been eliminated.
 
    These financial statements have been prepared without audit, pursuant to the
rules and regulations of the Securities and Exchange Commission. Certain
information and footnote disclosures normally included in financial statements
prepared in accordance with generally accepted accounting principles have been
condensed or omitted pursuant to such rules and regulations. These condensed
consolidated financial statements should be read in conjunction with the audited
consolidated financial statements and notes thereto contained elsewhere in this
Prospectus.
 
    The financial information included herein reflects all adjustments
(consisting only of normal recurring adjustments) which are, in the opinion of
management, necessary to a fair presentation of the results for interim periods.
The results of operations for the three month period ended March 31, 1997 are
not necessarily indicative of the results to be expected for the full year.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
    PRO FORMA NET LOSS PER SHARE
 
    Pro forma net loss per share has been computed using the number of shares of
Common Stock and Common Stock equivalents outstanding using the treasury stock
method. Pursuant to Securities and Exchange Commission Staff Accounting Bulletin
No. 83, shares issued and stock options granted at prices below the initial
public offering price of $    per share during the twelve-month period preceding
the date of the initial filing of the Registration Statement have been included
in the calculation of common stock equivalent shares, using the treasury stock
method, as if such shares and options were outstanding for all periods
presented.
 
    INCOME TAXES
 
    Prior to January 31, 1997, the Company was organized and operated as a
limited liability company that was classified and taxed as a partnership for
federal and state income tax purposes. Effective February 1, 1997, the Company
became subject to federal and state income taxes directly as a C corporation.
 
    The Company accounts for income taxes in accordance with the provisions of
Statement of Financial Accounting Standards No. 109, "Accounting for Income
Taxes," (SFAS 109) which requires that
 
                                      F-6
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
 
         NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
deferred income taxes be determined based on the estimated future tax effects of
differences between the financial statement and tax bases of assets and
liabilities given the provisions of the enacted tax laws.
 
    The conversion of the Company to a taxable corporation resulted in the
Company recording fully reserved net deferred tax assets. Major items giving
rise to deferred tax assets included deferred compensation and certain operating
expenses capitalized for tax purposes. Management believes that, based on a
number of factors, the available objective evidence created sufficient
uncertainty regarding the realization of net deferred tax assets. Accordingly, a
valuation allowance was provided for the net deferred tax assets of the Company.
The gross amount of deferred tax assets is not material in relation to the
Company's financial statements taken as a whole. The Company intends to make the
required annual disclosures of SFAS 109 in its consolidated financial statements
as of and for the year ended December 31, 1997.
 
3. INCORPORATION:
 
    On January 31, 1997, NEXTLINK Communications, L.L.C. was merged with and
into the Company in a tax-free transaction. In that merger, the Class A
membership interests of NEXTLINK Communications, L.L.C. were converted into
Class B common stock, options to acquire Class A membership interests were
converted into options to purchase Class B common stock, and options to purchase
Class B membership interests were converted into options to purchase Class A
common stock. The Company's Class A common stock and Class B common stock are
identical in dividend and liquidation rights, and vote together as a single
class on all matters, except as otherwise required by applicable law, with the
Class A shareholders entitled to cast one vote per share, and the Class B
shareholders entitled to cast 10 votes per share. In calculating the number of
shares of the Company's Class B common stock that each of the Class A members
received in the merger, the Company applied a formula that reflected each
member's revalued capital account balance as of January 31, 1997. Options to
purchase Class B membership interests were converted into options to purchase
shares of Class A common stock on a one to one basis. As of March 31, 1997, the
Company had 100,000,000 and 83,123,084 shares of Class B common stock authorized
and outstanding, respectively, and 250,000,000 and 0 shares of Class A common
stock authorized and outstanding, respectively. In addition, there were options
to purchase 4,741,774 shares of Class A common stock and options to purchase
3,571,364 shares of Class B common stock outstanding. The Company also had
25,000,000 and 5,700,000 shares of Preferred Stock authorized and outstanding,
respectively.
 
4. PREFERRED STOCK:
 
    On January 31, 1997, the Company completed the sale of 5.7 million units
consisting of (i) 14% senior exchangeable redeemable preferred shares (Preferred
Shares), liquidation preference $50 per share, and (ii) contingent warrants to
acquire in the aggregate 5% of each class of outstanding junior shares (as
defined) of the Company on a fully diluted basis as of February 1, 1998, which
resulted in gross proceeds to the Company of $285 million, and proceeds net of
underwriting discounts, advisory fees and expenses of $274 million. Dividends on
the Preferred Shares will accrue from January 31, 1997 and will be payable
quarterly commencing on May 1, 1997 at an annual rate of 14% of the liquidation
preference thereof. Dividends may be paid, at the Company's option, on any
dividend payment date occurring on or prior to February 1, 2002, either in cash
or by issuing additional Preferred Shares with an aggregate liquidation
preference equal to the amount of such dividends. The Company is required to
 
                                      F-7
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
 
         NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
4. PREFERRED STOCK: (CONTINUED)
redeem all of the Preferred Shares outstanding on February 1, 2009 at a
redemption price equal to 100% of the liquidation preference thereof, plus
accumulated and unpaid dividends to the date of redemption.
 
    Subject to certain conditions, the Preferred Shares are exchangeable in
whole, but not in part, at the option of the Company, on any dividend payment
date, for the 14% senior subordinated notes (Senior Subordinated Notes) due
February 1, 2009 of the Company. All terms and conditions (other than interest,
ranking and maturity) of the Senior Subordinated Notes would be substantially
the same as those of the Company's outstanding 12 1/2% Senior Notes due April
15, 2006.
 
    The contingent warrants are exercisable on any business day after February
1, 1998, if a Qualifying Event has not occurred on or prior to February 1, 1998.
A Qualifying Event means a public equity offering (as defined) or one or more
strategic equity investments (as defined) which, in either case, results in
aggregate net proceeds to the Company of not less than $75 million.
 
5. ACQUISITION:
 
    On February 4, 1997, the Company completed the acquisition of substantially
all of the assets of Linkatel Pacific, L.P. (Linkatel), a Los Angeles-based
competitive access telecommunications provider. At the time of the acquisition,
Linkatel operated an 80 mile fiber optic telecommunications network covering
several markets in the Orange and Los Angeles county areas. The acquired assets
consist primarily of fiber optic network equipment and rights-of-way. The
Company plans to expand the network and add switching facilities in order to
provide switched local services during 1997. The total purchase price of $42.5
million consisted of a cash payment of $36.1 million, the repayment of debt of
$5.6 million and the assumption of net liabilities of $0.8 million.
 
    The assets acquired and consideration given were as follows (in thousands):
 
<TABLE>
<CAPTION>
Fair value of tangible assets and liabilities acquired........  $  12,003
<S>                                                             <C>
Fair value of intangible assets acquired......................     29,682
                                                                ---------
                                                                $  41,685
                                                                ---------
                                                                ---------
Cash paid for assets, including repayment of debt.............  $  41,685
                                                                ---------
                                                                ---------
</TABLE>
 
6. PROPERTY AND EQUIPMENT:
 
    Networks and equipment consisted of the following:
 
<TABLE>
<CAPTION>
                                                                                MARCH 31,
                                                                                  1997
                                                                               -----------
<S>                                                                            <C>
Telecommunications networks..................................................  $    76,173
Office equipment, leasehold improvements, furniture and other................       20,362
                                                                               -----------
                                                                                    96,535
Less accumulated depreciation................................................       11,217
                                                                               -----------
                                                                                    85,318
Network construction in progress.............................................       39,682
                                                                               -----------
                                                                               $   125,000
                                                                               -----------
                                                                               -----------
</TABLE>
 
                                      F-8
<PAGE>
                         NEXTLINK COMMUNICATIONS, INC.
 
         NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
6. PROPERTY AND EQUIPMENT: (CONTINUED)
    Included in property and equipment are capitalized direct costs of
construction, including $287 of interest costs related to construction during
the three months ended March 31, 1997.
 
7. STOCK OPTION PLANS:
 
    Prior to February 1997, the Company maintained an Equity Option Plan which
provided for the granting of equity option interests in the Company. These
option grants were considered compensatory and were accounted for similar to
stock appreciation rights. The Company recognized compensation expense over the
vesting periods based on the excess of the fair value of the Class B Units, as
determined by the Administrative Committee, over the exercise price of the
option. Such expense was periodically adjusted for changes in the fair value of
the Class B units. These option interests vested ratably over a four-year
period, although some retained vesting schedules of previous option plans which,
in most cases, vested 20% at employment and 20% at the end of each subsequent
year.
 
    During the three months ended March 31, 1997, the Company recorded $892,000
of compensation expense related to the Equity Option Plan.
 
    In connection with the incorporation of the Company (see Note 3), the
Company established a stock option plan for the granting of qualified and
non-qualified stock options. All options outstanding under the previous plan
were regranted under the new Plan with terms and conditions substantially the
same as under the previous plan except that option holders will no longer have
the option to require the Company to repurchase units for cash upon exercise of
such units, nor will the Company have the option to repurchase exercised units
for cash.
 
    Information with respect to the Plan is as follows:
 
<TABLE>
<CAPTION>
                                                                             WEIGHTED
                                  SHARES SUBJECT                         AVERAGE EXERCISE
                                     TO OPTION     OPTION PRICE RANGE          PRICE
                                  ---------------  -------------------  -------------------
<S>                               <C>              <C>                  <C>
Balance, December 31, 1996......       4,542,222    $    0.01 -- 3.50        $    0.20
  Granted.......................         225,500    $            3.50        $    3.50
  Exercised.....................         (20,624)   $            0.01        $    0.01
  Canceled......................        (177,854)   $    0.01 -- 0.44        $    0.01
                                  ---------------
Balance, March 31, 1997                4,569,244    $    0.01 -- 3.50        $    0.35
                                  ---------------
                                  ---------------
</TABLE>
 
    As of March 31, 1997, there were 1,847,355 options vested, with a weighted
average exercise price of $0.03. In connection with the Company's stock option
plan established in April 1997, the Company reserved 10,000,000 shares of common
stock for issuance under the Plan. Including these shares reserved for issuance
under the new Plan, there would have been 5,430,756 shares available for grant
under the Plan as of March 31, 1997. The Company intends to make the complete
annual disclosures required under Statement of Financial Accounting Standards
No. 123, "Stock-Based Compensation," in its financial statements as of and for
the year ended December 31, 1997.
 
8. RECLASSIFICATIONS:
 
    Certain reclassifications have been made to prior period amounts in order to
conform to the current presentation.
 
                                      F-9
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Members of NEXTLINK Communications, L.L.C.:
 
    We have audited the accompanying consolidated balance sheets of NEXTLINK
Communications, L.L.C. (a Washington limited liability company) and subsidiaries
as of December 31, 1995 and 1996, and the related consolidated statements of
operations, changes in members' equity (deficit) and cash flows for the period
from inception (September 16, 1994) to December 31, 1994, and for the years
ended December 31, 1995 and 1996. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of NEXTLINK Communications,
L.L.C. and subsidiaries as of December 31, 1995 and 1996, and the results of
their operations and their cash flows for the period from inception (September
16, 1994) to December 31, 1994, and for the years ended December 31, 1995 and
1996 in conformity with generally accepted accounting principles.
 
                                              ARTHUR ANDERSEN LLP
 
Seattle, Washington,
February 10, 1997
 
                                      F-10
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
                           DECEMBER 31, 1995 AND 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                             1995         1996
                                                                                          -----------  -----------
<S>                                                                                       <C>          <C>
                                                      ASSETS
Current assets:
  Cash and cash equivalents.............................................................  $     1,350  $    76,807
  Marketable securities.................................................................      --            47,713
  Accounts receivable, net..............................................................        3,563        7,008
  Other.................................................................................          746          607
  Pledged securities....................................................................      --            39,770
                                                                                          -----------  -----------
      Total current assets..............................................................        5,659      171,905
Pledged securities......................................................................      --            61,668
Property and equipment, net.............................................................       29,664       97,784
Goodwill, net...........................................................................       12,137       24,110
Other intangible assets, net............................................................        5,751       11,243
Other long-term assets, net.............................................................          250       23,973
                                                                                          -----------  -----------
      Total assets......................................................................  $    53,461  $   390,683
                                                                                          -----------  -----------
                                                                                          -----------  -----------
                                    LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Current liabilities:
  Bank overdraft........................................................................  $     1,373  $   --
  Accounts payable......................................................................        4,315       18,622
  Accrued expenses......................................................................        1,266        4,112
  Accrued interest payable..............................................................      --             9,250
  Current portion of capital lease obligations..........................................      --             1,194
  Payable to affiliates.................................................................        4,937        1,500
                                                                                          -----------  -----------
      Total current liabilities.........................................................       11,891       34,678
Long-term liabilities:
  Long-term debt........................................................................      --           350,000
  Capital lease obligations.............................................................      --             6,262
  Other.................................................................................        1,965       13,139
                                                                                          -----------  -----------
      Total liabilities.................................................................       13,856      404,079
Commitments and contingencies
Minority interests......................................................................        2,886          308
Equity units subject to redemption (900,000 units outstanding as of December 31,
  1996).................................................................................      --             4,950
Members' equity (deficit) (49,798,659 and 63,793,820 units outstanding as of December
  31, 1995 and 1996, respectively)......................................................       36,719      (18,654)
                                                                                          -----------  -----------
      Total liabilities and members' equity (deficit)...................................  $    53,461  $   390,683
                                                                                          -----------  -----------
                                                                                          -----------  -----------
</TABLE>
 
 The accompanying notes are an integral part of these consolidated statements.
 
                                      F-11
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
    FOR THE PERIOD FROM INCEPTION (SEPTEMBER 16, 1994) TO DECEMBER 31, 1994,
               AND FOR THE YEARS ENDED DECEMBER 31, 1995 AND 1996
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                    1994        1995        1996
                                                                                  ---------  ----------  ----------
<S>                                                                               <C>        <C>         <C>
Revenue.........................................................................  $      --  $    7,552  $   25,686
Costs and expenses:
  Operating.....................................................................        106       6,618      25,094
  Selling, general and administrative...........................................        232       9,563      31,353
  Deferred compensation.........................................................         --         375       9,914
  Depreciation..................................................................          7       1,125       6,640
  Amortization of intangible assets.............................................          7       2,333       3,700
                                                                                  ---------  ----------  ----------
      Total costs and expenses..................................................        352      20,014      76,701
                                                                                  ---------  ----------  ----------
Loss from operations............................................................       (352)    (12,462)    (51,015)
Interest income.................................................................         --          --      10,446
Interest expense................................................................         --        (499)    (30,876)
                                                                                  ---------  ----------  ----------
Loss before minority interests..................................................       (352)    (12,961)    (71,445)
Minority interests in loss of consolidated subsidiaries.........................          3         230         344
                                                                                  ---------  ----------  ----------
Net loss........................................................................  $    (349) $  (12,731) $  (71,101)
                                                                                  ---------  ----------  ----------
                                                                                  ---------  ----------  ----------
Pro Forma:
    Net loss per share..........................................................                         $
                                                                                                         ----------
                                                                                                         ----------
    Shares used in computation of pro forma net loss per share..................
                                                                                                         ----------
                                                                                                         ----------
</TABLE>
 
 The accompanying notes are an integral part of these consolidated statements.
 
                                      F-12
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
        CONSOLIDATED STATEMENTS OF CHANGES IN MEMBERS' EQUITY (DEFICIT)
 
    FOR THE PERIOD FROM INCEPTION (SEPTEMBER 16, 1994) TO DECEMBER 31, 1994,
               AND FOR THE YEARS ENDED DECEMBER 31, 1995 AND 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                            UNITS        AMOUNT
                                                                                        -------------  ----------
<S>                                                                                     <C>            <C>
BALANCE, INCEPTION (SEPTEMBER 16, 1994)...............................................       --        $   --
  Contributed capital.................................................................      1,021,305       1,021
  Net loss............................................................................       --              (349)
                                                                                        -------------  ----------
 
BALANCE, DECEMBER 31, 1994............................................................      1,021,305         672
  Contributed capital.................................................................     44,365,413      44,366
  Issuance of units for NEXTLINK Interactive acquisition..............................      4,411,941       4,412
  Net loss............................................................................       --           (12,731)
                                                                                        -------------  ----------
 
BALANCE, DECEMBER 31, 1995............................................................     49,798,659      36,719
  Contributed capital.................................................................      9,502,021       9,502
  Issuance of units for NEXTLINK Ohio acquisition.....................................        651,933         652
  Impact of recapitalization and merger of affiliates.................................      3,841,207       5,574
  Net loss............................................................................       --           (71,101)
                                                                                        -------------  ----------
 
BALANCE, DECEMBER 31, 1996............................................................     63,793,820  $  (18,654)
                                                                                        -------------  ----------
                                                                                        -------------  ----------
</TABLE>
 
 The accompanying notes are an integral part of these consolidated statements.
 
                                      F-13
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
    FOR THE PERIOD FROM INCEPTION (SEPTEMBER 16, 1994) TO DECEMBER 31, 1994,
               AND FOR THE YEARS ENDED DECEMBER 31, 1995 AND 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    1994        1995        1996
                                                                                  ---------  ----------  ----------
<S>                                                                               <C>        <C>         <C>
OPERATING ACTIVITIES:
Net loss........................................................................  $    (349) $  (12,731) $  (71,101)
Adjustments to reconcile net loss to net cash used in operating activities:
    Deferred compensation expense...............................................     --             375       9,914
    Equity in loss of affiliates................................................     --          --           1,100
    Depreciation and amortization...............................................         14       3,458      10,340
    Minority interest in loss of consolidated subsidiaries......................         (3)       (230)       (344)
Changes in assets and liabilities, net of effects from acquisitions:
    Accounts receivable.........................................................     --          (2,529)     (1,659)
    Other current assets........................................................     --            (638)        (42)
    Other long-term assets......................................................        (79)       (500)     (1,430)
    Accounts payable............................................................     --           2,163         993
    Accrued expenses............................................................         21       1,452       2,416
    Accrued interest payable....................................................     --          --           9,250
                                                                                  ---------  ----------  ----------
        Total adjustments.......................................................        (47)      3,551      30,538
                                                                                  ---------  ----------  ----------
Net cash used in operating activities...........................................       (396)     (9,180)    (40,563)
INVESTING ACTIVITIES:
    Purchase of property and equipment..........................................       (140)    (17,778)    (51,920)
    Net assets acquired in business and asset acquisitions......................       (460)    (17,639)    (15,169)
    Cash placed into escrow for business acquisition............................     --          --          (6,000)
    Investments in unconsolidated affiliates....................................     --          --          (4,953)
    Purchase of pledged securities..............................................     --          --        (117,688)
    Maturity of pledged securities..............................................     --          --          16,431
    Purchase of marketable securities,net.......................................     --          --         (47,713)
                                                                                  ---------  ----------  ----------
Net cash used in investing activities...........................................       (600)    (35,417)   (227,012)
FINANCING ACTIVITIES:
    Proceeds from issuance of senior notes......................................     --          --         350,000
    Capital contributions.......................................................      1,021      37,091       9,935
    Proceeds from payable to affiliates.........................................     --           7,458      28,766
    Repayment of payables to affiliates.........................................     --          --         (33.703)
    Bank overdraft..............................................................     --           1,373      (1,373)
    Costs incurred in connection with financing.................................     --          --          (9,822)
    Repayment of capital lease obligations......................................     --          --            (771)
                                                                                  ---------  ----------  ----------
Net cash provided by financing activities.......................................      1,021      45,922     343,032
                                                                                  ---------  ----------  ----------
Net increase in cash and cash equivalents.......................................         25       1,325      75,457
Cash and cash equivalents, beginning of period..................................     --              25       1,350
                                                                                  ---------  ----------  ----------
Cash and cash equivalents, end of period........................................  $      25  $    1,350  $   76,807
                                                                                  ---------  ----------  ----------
                                                                                  ---------  ----------  ----------
SUPPLEMENTAL CASH FLOW DISCLOSURES:
    Cash paid for interest, net of amount capitalized...........................  $  --      $       16  $   20,912
                                                                                  ---------  ----------  ----------
                                                                                  ---------  ----------  ----------
</TABLE>
 
                                      F-14
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
               CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)
 
    FOR THE PERIOD FROM INCEPTION (SEPTEMBER 16, 1994) TO DECEMBER 31, 1994,
               AND FOR THE YEARS ENDED DECEMBER 31, 1995 AND 1996
                             (DOLLARS IN THOUSANDS)
 
SUPPLEMENTAL CASH FLOW DISCLOSURES:
 
Noncash investing and financing activities:
 
    During 1995 and 1996, the Company completed various acquisitions of
businesses and assets (see Note 3). In connection with these acquisitions, the
Company issued equity units and assumed liabilities as follows:
 
<TABLE>
<CAPTION>
                                                                                               1995       1996
                                                                                             ---------  ---------
<S>                                                                                          <C>        <C>
Fair value of tangible assets acquired.....................................................  $  11,500  $  12,579
Liabilities assumed........................................................................     (3,554)    (8,228)
Fair value of intangible assets acquired...................................................     19,335     16,420
                                                                                             ---------  ---------
                                                                                             $  27,281  $  20,771
                                                                                             ---------  ---------
                                                                                             ---------  ---------
 
Cash paid for assets.......................................................................  $  17,022  $  15,169
Deferred purchase consideration............................................................      3,000     --
Equity units issued:
  Company units issued (1).................................................................      4,412      5,602
  Subsidiary units and options issued......................................................      2,847     --
                                                                                             ---------  ---------
                                                                                             $  27,281  $  20,771
                                                                                             ---------  ---------
                                                                                             ---------  ---------
</TABLE>
 
- ------------------------
 
(1) Company units issued in 1996 includes 900,000 Class A Units valued at $4,950
    which are subject to redemption (see Note 3).
 
    During 1996, the Company acquired $1,377 in property and equipment under
capital lease obligations, exclusive of property and equipment under capital
lease obligations which were acquired in acquisitions.
 
    In January 1996, the Company recognized additional members' equity and
goodwill of $5,574 and $2,907, respectively, and a reduction in minority
interests of $2,667 relating to a recapitalization and merger of companies
holding minority equity interests in certain subsidiaries of the Company, which
exchanged these interests for Class A Units of the Company.
 
    In December 1995, the Company issued 7,273,918 Class A Units to an affiliate
in satisfaction of a payable of $7,274.
 
 The accompanying notes are an integral part of these consolidated statements.
 
                                      F-15
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                               DECEMBER 31, 1996
 
1. ORGANIZATION:
 
    The consolidated financial statements include the accounts of NEXTLINK
Communications, L.L.C., a Washington limited liability company, and its
majority-owned subsidiaries (the Company). The Company, through predecessor
entities, was formed on September 16, 1994 and, through its subsidiaries,
provides competitive local telecommunications services in selected markets in
the United States. The Company is a majority-owned subsidiary of Eagle River
Investments, L.L.C. (Eagle River).
 
    Prior to January 31, 1997, the Company was organized and operated under a
limited liability company agreement. The agreement provided, among other things,
for specific allocation of net profits and losses to each member, allocations
and distributions to members, and a preferred return to members on their
respective contributions invested in the Company, as well as a return of their
respective investments in the Company. On January 31, 1997, NEXTLINK
Communications, L.L.C. merged with and into NEXTLINK Communications, Inc., a
Washington corporation (the Incorporation). See Note 12 for further discussion.
Unless otherwise indicated all information presented herein is presented for
periods prior to the Incorporation, and therefore relate to the time that the
Company was a limited liability company.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
    PRINCIPLES OF CONSOLIDATION
 
    The Company's consolidated financial statements include 100% of the assets,
liabilities and results of operations of subsidiaries in which the Company has a
controlling interest of greater than 50%. The ownership interests of the other
members or partners are reflected as minority interests. The Company's
investments in entities in which it has voting interests of at least 20% but not
more than 50% are accounted for using the equity method and investments in
entities in which it has voting interests of not more than 20% are accounted for
using the cost method. All significant intercompany accounts and transactions
have been eliminated.
 
    REVENUE RECOGNITION
 
    The Company recognizes revenue on telecommunications and enhanced
communications services in the period that service is provided.
 
    CASH AND CASH EQUIVALENTS
 
    Cash equivalents consist of highly liquid investments with original
maturities of three months or less at the time of purchase.
 
    MARKETABLE SECURITIES
 
    Marketable securities consist of U.S. government securities and commercial
paper with original maturities beyond three months, but less than 12 months.
Marketable securities are stated at cost, adjusted for discount accretion and
premium amortization. The securities in the Company's portfolio are classified
as "held to maturity," as management has the intent and ability to hold those
securities to maturity. The fair value of the Company's marketable securities
approximates the carrying value.
 
                                      F-16
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
    PLEDGED SECURITIES
 
    In connection with the sale of Senior Notes (see Note 6), a portion of the
net proceeds were utilized to purchase a portfolio consisting of U.S. government
securities, which mature at dates sufficient to provide for payment in full of
interest on the Senior Notes through April 15, 1999. The pledged securities are
stated at cost, adjusted for premium amortization and accrued interest. The fair
value of the pledged securities approximates the carrying value.
 
    PROPERTY AND EQUIPMENT
 
    Property and equipment are stated at cost. Direct costs of construction are
capitalized, including $853,000 of interest costs related to construction during
1996. There were no interest costs capitalized prior to 1996. Depreciation is
computed using the straight-line method over estimated useful lives beginning in
the month an asset is put into service.
 
    Estimated useful lives of property and equipment are as follows:
 
<TABLE>
<S>                                                  <C>
Telecommunications switching and other equipment...  5-10 years
Fiber optic network................................  15-20 years
Office equipment, furniture and other..............  3-5 years
Leasehold improvements.............................  the lesser of the
                                                     estimated useful lives
                                                     or
                                                     the terms of the
                                                     leases
</TABLE>
 
    INTANGIBLE ASSETS
 
    Intangible assets primarily represent costs allocated in acquisitions to
customer bases and contracts, software and related intellectual property and
goodwill. Intangible assets are amortized using the straight-line method over
the estimated useful lives of the assets as follows:
 
<TABLE>
<S>                                                     <C>
Customer contracts....................................  term of the
                                                        contracts
Customer bases........................................  5 years
Software and related intellectual property............  5 years
Goodwill..............................................  15-20 years
</TABLE>
 
    LONG-LIVED ASSETS
 
    The Company periodically reviews the carrying value of its long-lived
assets, including property, equipment and intangible assets, whenever events or
changes in circumstances indicate that the carrying value may not be
recoverable. To the extent the estimated future cash inflows attributable to the
asset, less estimated future cash outflows, is less than the carrying amount, an
impairment loss is recognized.
 
                                      F-17
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
    INCOME TAXES
 
    The Company has been organized and operated under a limited liability
company agreement structured in a manner that is intended to result in the
classification of the Company as a partnership for federal income tax purposes.
Accordingly, no provision for income taxes has been made. See Note 12 for
discussion regarding the effect of the Incorporation.
 
    CONCENTRATION OF CREDIT RISK
 
    The Company is exposed to concentration of credit risk principally from
accounts receivable. The Company had three customers whose revenue each
represented approximately 12-14% of the Company's 1995 revenue and one customer
whose revenue represented approximately 23% of the Company's 1996 revenue.
 
    ESTIMATES USED IN FINANCIAL STATEMENT PRESENTATION
 
    The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
the disclosure of contingent assets and liabilities at the date of the financial
statements. Actual results could differ from those estimates.
 
    RECLASSIFICATIONS
 
    Certain reclassifications have been made to prior period amounts in order to
conform to the current presentation.
 
    PRO FORMA NET LOSS PER SHARE
 
    Pro forma net loss per share has been computed using the number of shares of
Common Stock and Common Stock equivalents outstanding using the treasury stock
method. Pursuant to Securities and Exchange Commission Staff Accounting Bulletin
No. 83, shares issued and stock options granted at prices below the initial
public offering price of $    per share during the twelve-month period preceding
the date of the initial filing of the Registration Statement have been included
in the calculation of common stock equivalent shares, using the treasury stock
method, as if such shares and options were outstanding for the year ended
December 31, 1996.
 
3. ACQUISITIONS:
 
    In December 1996, the Company acquired ITC, a switched-based long-distance
reseller based in Salt Lake City, Utah. ITC has approximately 9,000
long-distance customers in Utah, Colorado, Arizona, New Mexico and Idaho.
Consideration for the acquisition of ITC consisted of a cash payment of $4.0
million, of which $2.6 million was placed into escrow to be paid during 1998,
plus the issuance of 900,000 Class A Units of the Company. The Company has
granted the seller an option requiring the Company to repurchase the units at
$11.50 per unit beginning three years from the date of the closing of the
acquisition in the event that the Company has not completed a public offering of
its equity securities prior to that time. The Company has valued the units,
including the put option, at $4,950,000, or $5.50 per unit.
 
                                      F-18
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
3. ACQUISITIONS: (CONTINUED)
    In January 1996, the Company acquired certain assets of FoneNet, Inc. and
U.S. Network, Inc. through NEXTLINK Ohio, L.L.C. NEXTLINK Ohio, L.L.C. is
currently constructing fiber optic telecommunications systems for the Ohio
region. Consideration for the purchase consisted of a cash payment of $9.6
million, the issuance of 651,933 Class A Units of the Company, valued at
$651,933, plus the assumption of capital lease obligations of $6.1 million.
 
    In September 1995, the Company acquired certain assets of Sound Response
Corporation and immediately contributed the assets to NEXTLINK Interactive,
L.L.C. NEXTLINK Interactive, L.L.C. provides interactive voice response and
debit card services. The total cost of the acquisition was approximately $12.2
million. Included in the cost of the acquisition are 4,411,941 Class A Units of
the Company valued at $4,411,941 and $3.0 million of deferred purchase
consideration payable to BWP, Inc. (formerly known as Sound Response
Corporation) of which $1.5 million was paid during 1996 and $1.5 is payable
during 1997.
 
    In May 1995, the Company acquired certain assets of City Signal, Inc. and
Teledial America, Inc. relating to the Magic Number service, through NEXTLINK
Solutions, L.L.C. These assets are used by NEXTLINK Solutions, L.L.C. to offer a
virtual communications center for mobile professionals and workgroups. The total
cost of the acquisition was approximately $617,000.
 
    In April 1995, the Company acquired the telecommunications business of
Tel-West Central Services, Inc., a local exchange service reseller in Spokane,
Washington, through acquisition of the ownership units of NEXTLINK Washington,
L.L.C. The total cost of the acquisition was approximately $1.2 million.
 
    In January 1995, the Company acquired certain assets of City Signal, Inc.
(which is also known as U.S. Signal) through NEXTLINK Tennessee, L.L.C,
primarily consisting of an existing fiber optic telecommunications network in
Memphis and another network then under development in Nashville. NEXTLINK
Tennessee, L.L.C. is expanding the networks and is currently providing switched
local and long-distance telecommunications services in these markets. The total
cost of the acquisition was approximately $17.5 million. Included in the cost of
the acquisition were 2,847,444 Class A Units and related options of NEXTLINK
Tennessee, L.L.C. valued at $2,847,444.
 
    In September 1994, the Company acquired certain assets of Penns Light
Communications, Inc. through NEXTLINK Pennsylvania, L.P. The total cost of the
acquisition was approximately $460,000.
 
    The above described acquisitions have been accounted for as purchases and,
accordingly, the acquired assets and liabilities have been recorded at their
estimated fair values at the date of the acquisition, and the results of
operations have been included in the accompanying consolidated financial
statements since the dates of acquisition. The total purchase price in excess of
the fair market value of the net assets acquired was recorded as goodwill. See
Note 10 for a discussion of valuation of Class A Units.
 
    The following unaudited pro forma information presents the results of the
Company as if the above described acquisitions plus the Linkatel acquisition
(see Note 12) had occurred as of the beginning of 1995. These results include
certain adjustments consistent with the Company's accounting policies.
 
                                      F-19
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
3. ACQUISITIONS: (CONTINUED)
These results are not necessarily indicative of the results that actually would
have been attained if the acquisitions had been in effect at the beginning of
1995 or which may be attained in the future.
<TABLE>
<CAPTION>
                                                                                                DECEMBER 31,
                                                                                           ----------------------
<S>                                                                                        <C>         <C>
                                                                                              1995        1996
                                                                                           ----------  ----------
 
<CAPTION>
                                                                                               (UNAUDITED, IN
                                                                                                 THOUSANDS)
<S>                                                                                        <C>         <C>
Revenue..................................................................................  $   25,620  $   36,105
Net loss.................................................................................  $  (15,992) $  (67,616)
</TABLE>
 
4. PROPERTY AND EQUIPMENT:
<TABLE>
<CAPTION>
                                                                                                 DECEMBER 31,
                                                                                             --------------------
<S>                                                                                          <C>        <C>
                                                                                               1995       1996
                                                                                             ---------  ---------
 
<CAPTION>
                                                                                                (IN THOUSANDS)
<S>                                                                                          <C>        <C>
Telecommunications networks................................................................  $  15,358  $  66,762
Office equipment, leasehold improvements, furniture and other..............................      3,710     18,097
                                                                                             ---------  ---------
                                                                                                19,068     84,859
Less accumulated depreciation..............................................................     (1,125)    (8,369)
                                                                                             ---------  ---------
                                                                                                17,943     76,490
Network construction in progress...........................................................     11,721     21,294
                                                                                             ---------  ---------
                                                                                             $  29,664  $  97,784
                                                                                             ---------  ---------
                                                                                             ---------  ---------
</TABLE>
 
5. OTHER LONG-TERM ASSETS:
<TABLE>
<CAPTION>
                                                                                                    DECEMBER 31,
                                                                                                --------------------
<S>                                                                                             <C>        <C>
                                                                                                  1995       1996
                                                                                                ---------  ---------
 
<CAPTION>
                                                                                                   (IN THOUSANDS)
<S>                                                                                             <C>        <C>
Financing costs...............................................................................  $  --      $   9,822
Cash held in escrow for acquisitions..........................................................     --          8,682
Equity investments............................................................................     --          3,853
Advances to business to be acquired...........................................................     --          1,490
Other noncurrent assets.......................................................................        250        854
                                                                                                ---------  ---------
                                                                                                      250     24,701
Less accumulated amortization.................................................................     --           (728)
                                                                                                ---------  ---------
                                                                                                $     250  $  23,973
                                                                                                ---------  ---------
                                                                                                ---------  ---------
</TABLE>
 
    The Company's equity investments include (i) a 40% investment in
Telecommunications of Nevada, L.L.C., which operates a fiber optic
telecommunications network serving the Las Vegas market and (ii) a $3.2 million
investment in convertible preferred stock of Intermind Corporation, representing
a 13.6% voting interest. Intermind markets an interactive communications tool
for the World Wide Web and intranet applications.
 
                                      F-20
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
6. LONG-TERM DEBT:
 
    On April 25, 1996, the Company completed the issuance and sale of $350.0
million in principal amount of 12.5% Senior Notes due April 15, 2006. The
Company used $117.7 million of the gross proceeds to purchase U.S. government
securities, representing funds sufficient to provide for payment in full of
interest on the Senior Notes through April 15, 1999 and used an additional $32.2
million to repay the advances and accrued interest from Eagle River. In
addition, the Company incurred costs of $9.8 million in connection with the
financing (including underwriter discounts and commissions). Interest payments
on the Senior Notes are due semi-annually. As of December 31, 1996, the fair
value of long-term debt approximated carrying value.
 
    The Senior Notes will be redeemable at the option of the Company, in whole
or in part, at any time on or after April 15, 2001 at the following prices
(expressed in percentages of the principal amount thereof at stated maturity) if
redeemed during the 12-month period beginning April 15 of the years indicated
below, in each case together with interest accrued to the redemption date:
 
<TABLE>
<CAPTION>
YEAR                                                                                   PERCENTAGE
- -------------------------------------------------------------------------------------  -----------
<S>                                                                                    <C>
2001.................................................................................     106.250%
2002.................................................................................     104.167%
2003.................................................................................     102.083%
2004 and thereafter..................................................................     100.000%
</TABLE>
 
    The indenture pursuant to which the Senior Notes are issued contains certain
covenants that, among other things, limits the ability of the Company and its
subsidiaries to incur additional indebtedness, issue stock in subsidiaries, pay
dividends or make other distributions, repurchase equity interests or
subordinated indebtedness, engage in sale and leaseback transactions, create
certain liens, enter into certain transactions with affiliates, sell assets of
the Company and its subsidiaries, and enter into certain mergers and
consolidations.
 
    In the event of a change in control of the Company as defined in the
indenture, holders of the Senior Notes will have the right to require the
Company to purchase their Senior Notes, in whole or in part, at a price equal to
101% of the stated principal amount thereof, plus accrued and unpaid interest,
if any, thereon to the date of purchase. The Senior Notes are senior unsecured
obligations of the Company, and are subordinated to all current and future
indebtedness of the Company's subsidiaries, including trade payables.
 
7. RELATED PARTY TRANSACTIONS:
 
    During 1995, Eagle River loaned the Company $7.3 million at an interest rate
of prime plus 2%. On December 1, 1995, the note payable and accrued interest
were converted to equity.
 
    Included in payable to affiliates is $1.5 million payable to a Company
member in conjunction with the Sound Response Corporation acquisition. The
amount is due September 1, 1997.
 
    The Company incurred expenses provided by an affiliate and minority member
for administrative services as a result of a temporary agreement related to
certain acquisitions. The Company recorded expenses in connection with fees to
this affiliate of approximately $1.5 million in 1995.
 
                                      F-21
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
8. COMMITMENTS AND CONTINGENCIES:
 
    Capitalized leases consist of leases of telecommunications equipment and
fiber optic networks. The Company is also leasing premises under various
operating leases which, in addition to rental payments, require payments for
insurance, maintenance, property taxes and other executory costs related to the
leases. The lease agreements have various expiration dates and renewal options
through 2015.
 
    Future minimum payments required under the capital leases and operating
leases and agreements that have an initial or remaining noncancelable lease term
in excess of one year at December 31, 1996 are summarized below:
 
<TABLE>
<CAPTION>
                                                                         CAPITAL    OPERATING
YEARS ENDING DECEMBER 31,                                                LEASES      LEASES
- ----------------------------------------------------------------------  ---------  -----------
<S>                                                                     <C>        <C>
                                                                            (IN THOUSANDS)
1997                                                                    $   2,322   $   2,562
1998                                                                        2,310       2,568
1999                                                                        2,213       2,537
2000                                                                        1,921       2,338
2001                                                                          285       1,971
Thereafter............................................................      1,376       8,051
                                                                        ---------
Total minimum lease payments..........................................     10,427
Amounts representing interest.........................................     (2,971)
                                                                        ---------
Present value of future minimum lease payments........................      7,456
Less amounts due in one year..........................................     (1,194)
                                                                        ---------
                                                                        $   6,262
                                                                        ---------
                                                                        ---------
</TABLE>
 
    Total rent expense amounted to $18,000, $579,000 and $2,248,000, in 1994,
1995 and 1996, respectively.
 
    The Company is obligated under a supply agreement with a telecommunications
equipment vendor to purchase a certain dollar volume of equipment over the next
four years in order to obtain special pricing. If the Company is unable to meet
the required purchase commitment, the Company will be obligated to pay
additional amounts for previous purchases.
 
9. EMPLOYEE BENEFIT PLAN:
 
    The Company offers a 401(k) Plan to eligible employees as part of a 401(k)
Plan administered by an affiliate and Company member. All employees who have
worked at least 1,000 hours and have attained the age of 21 are eligible to
participate in the plan. Company contributions to the plan totaled $50,000 and
$357,000 in 1995 and 1996, respectively.
 
10. MEMBERS' EQUITY:
 
    MEMBERSHIP UNITS
 
    The Company's limited liability company agreement provides for both Class A
and Class B membership interests in the Company. Class A Unit holders are
entitled to a preferred return on their investment in the Company plus a return
of their capital upon the dissolution of the Company. Class B
 
                                      F-22
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
10. MEMBERS' EQUITY: (CONTINUED)
Units are granted in connection with the Company's Amended and Restated Equity
Option Plan (EOP). Although Class B Units, when exercised, will constitute an
ownership interest in the Company, the interest is limited to the appreciation
in the value of the Company, that is the distributable profits interest, if any,
of the Company. On January 31, 1997, the Company merged with and into NEXTLINK
Communications, Inc. (see Note 12).
 
    The valuation of membership units is determined by the EOP Administrative
Committee. The value of Class A Units as of December 31, 1995 and 1996 was
determined to be approximately $1.45 and $4.36, respectively, and the
appreciation interest per unit for Class B Units was approximately $0.44 and
$3.50 as of the same dates.
 
    RECAPITALIZATION
 
    Effective January 1, 1996, the Company merged four of its five operating
subsidiaries with newly formed entities owned by the Company (the
Recapitalization). As a result of these mergers, the entities and individuals
holding minority interests in the subsidiaries exchanged these interests for
3,841,207 Class A Units of the Company (representing an approximate 5.9%
ownership interest in the Company) which were valued at approximately $5.6
million. NEXTLINK Washington, L.L.C. did not participate in the merger. The
transaction has been accounted for as a purchase of minority interests.
Accordingly, the $2.9 million excess of the purchase price over the book value
of the interests acquired was recorded as goodwill.
 
    In addition to the exchange of equity interests, the Company exchanged
options to acquire equity interests in the subsidiaries for options to acquire
Class B Units in the Company. In connection with this transaction, the Company
issued 1,953,656 options with exercise prices of $0.01 and four-year vesting
schedules. These options had substantially the same economic values and vesting
schedules as the subsidiary options which were exchanged. These options are
included in the summary of information regarding the EOP that follows.
 
    EQUITY OPTION PLANS
 
    The Company and certain of its subsidiaries provided for grants of equity
option interests (EO Interests) during 1994 and 1995. The various option grants,
including those granted pursuant to the Recapitalization, are considered
compensatory and are accounted for similar to stock appreciation rights. The
Company recognizes compensation expense over the vesting period based on the
excess of the fair value of the Class B Units, as determined by the
Administrative Committee, over the exercise price of the option and such expense
is periodically adjusted for changes in the fair value of the Class B units.
 
    Effective January 1, 1996, the various option plans mentioned above were
replaced by the EOP. The EOP provides for the grant of EO Interests in the
Company. Options generally expire 15 years from the date of grant and vest 25%
at the end of each of the next four years. Previously granted options continue
to vest under their previous schedule which, in most cases, vested 20% at
employment and 20% at the end of each subsequent year.
 
                                      F-23
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
10. MEMBERS' EQUITY: (CONTINUED)
    Information regarding the Company's EOP is summarized below:
 
<TABLE>
<CAPTION>
                                                                                  WEIGHTED
                                                                                  AVERAGE
                                                                    NUMBER        EXERCISE
                                                                   OF UNITS        PRICES
                                                                  -----------  --------------
<S>                                                               <C>          <C>
Balance, inception (September 16, 1994).........................
  Granted.......................................................      898,996  $         0.01
                                                                  -----------
Balance, December 31, 1994......................................      898,996  $         0.01
  Granted.......................................................    1,135,176  $         0.01
  Granted pursuant to the Recapitalization......................    1,953,656  $         0.01
  Canceled......................................................     (375,000) $         0.01
                                                                  -----------
Balance, December 31, 1995......................................    3,612,828  $         0.01
  Granted.......................................................    1,031,002  $         0.85
  Canceled......................................................     (101,608) $         0.01
                                                                  -----------
Balance, December 31, 1996......................................    4,542,222  $         0.20
                                                                  -----------
                                                                  -----------
</TABLE>
 
    Of the options outstanding at December 31, 1996, there were 4,383,722 with
exercise prices ranging from $0.01 to $0.44 and 158,500 with an exercise price
of $3.50.
 
    As of December 31, 1994, 1995 and 1996, there were 59,149, 805,864 and
1,551,782 options vested, respectively. For the same periods, the weighted
average exercise for these vested options were $0.01, $0.01 and $0.02,
respectively. The Company recorded $375,000 and $9,914,000 of deferred
compensation expense related to the EOP during 1995 and 1996, respectively. Such
deferred compensation is included in other long-term liabilities.
 
    On January 31, 1997, in conjunction with the Incorporation, the Company
established a new stock option plan. All options previously outstanding will be
regranted under the new plan with terms and conditions substantially the same as
under the previous plan except that option holders will no longer have the
option to require the Company to repurchase units for cash upon exercise of such
units, nor will the Company have the option to repurchase exercised units for
cash.
 
11. QUARTERLY SUMMARY OF OPERATIONS (UNAUDITED):
 
    The financial information presented below reflects all adjustments
(consisting of normal recurring adjustments) which are, in the opinion of
management, necessary to a fair presentation of the results for the interim
periods.
 
                                      F-24
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
11. QUARTERLY SUMMARY OF OPERATIONS (UNAUDITED): (CONTINUED)
    Summarized quarterly financial data for 1995 and 1996 is as follows
(unaudited, in thousands):
<TABLE>
<CAPTION>
                                                                   1995
                                               ---------------------------------------------
<S>                                            <C>        <C>         <C>         <C>
                                                  1ST        2ND         3RD         4TH
                                               ---------  ----------  ----------  ----------
Revenue......................................  $     399  $    1,000  $    2,825  $    3,328
Cost and expenses............................      2,003       3,289       5,271       9,451
                                               ---------  ----------  ----------  ----------
Loss from operations.........................     (1,604)     (2,289)     (2,446)     (6,123)
Other income, net............................         43          36         (95)       (253)
                                               ---------  ----------  ----------  ----------
Net loss.....................................  $  (1,561) $   (2,253) $   (2,541) $   (6,376)
                                               ---------  ----------  ----------  ----------
                                               ---------  ----------  ----------  ----------
 
<CAPTION>
                                                                   1996
                                               ---------------------------------------------
                                                  1ST        2ND         3RD         4TH
                                               ---------  ----------  ----------  ----------
<S>                                            <C>        <C>         <C>         <C>
Revenue......................................  $   5,370  $    6,671  $    6,919  $    6,726
Cost and expenses............................     12,041      15,415      23,050      26,195
                                               ---------  ----------  ----------  ----------
Loss from operations.........................     (6,671)     (8,744)    (16,131)    (19,469)
Other income (expense), net..................       (445)     (4,973)     (7,371)     (7,297)
                                               ---------  ----------  ----------  ----------
Net loss.....................................  $  (7,116) $  (13,717) $  (23,502) $  (26,766)
                                               ---------  ----------  ----------  ----------
                                               ---------  ----------  ----------  ----------
</TABLE>
 
12. SUBSEQUENT EVENTS:
 
    INCORPORATION
 
    On January 31, 1997, the Company was merged into NEXTLINK Communications,
Inc. (Communications), a Washington corporation in a tax-free transaction. In
the merger, the Company's Class A membership interests were converted into
shares of Class B common stock of Communications, and options to purchase Class
B membership interests were converted into options to purchase shares of Class A
common stock of Communications. Communications Class A common stock and Class B
common stock will be identical in dividend and liquidation rights, and will vote
together as a single class on all matters, except as otherwise required by
applicable law, with the Class A shareholders entitled to cast one vote per
share, and the Class B shareholders entitled to cast 10 votes per share. In
calculating the number of shares of Communications common stock that each of the
Company's Class A members received in the merger, the Company applied a formula
that reflected each members' revalued capital account balance as of January 31,
1997. Class B membership options were converted on a one to one basis. After the
incorporation, Communications had 100,000,000 and 83,123,084 shares of Class B
common stock authorized and outstanding, respectively and 250,000,000 and 0
shares of Class A common stock authorized and outstanding, respectively with
options to purchase 4,668,912 shares of Class A common stock outstanding.
Communications also has 25,000,000 shares of Preferred Shares authorized,
5,700,000 are outstanding. See below under "Financing." The amount of Class B
common stock outstanding excludes 3,571,364 shares of Class B common stock
issuable upon exercise of an option granted to Mr. James F. Voelker, the
Company's President.
 
                                      F-25
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
12. SUBSEQUENT EVENTS: (CONTINUED)
    The conversion of the Company to a taxable corporation will result in the
Company recording fully reserved net deferred tax assets. Major items giving
rise to deferred tax assets include deferred compensation and certain operating
expenses capitalized for tax purposes. Management believes that, based on a
number of factors, the available objective evidence creates sufficient
uncertainty regarding the realization of the net deferred tax assets.
Accordingly, a valuation allowance will be provided for the net deferred tax
assets of the Company.
 
    FINANCING
 
    On January 31, 1997, the Company completed the sale of 5.7 million units
consisting of (i) 14% senior exchangeable redeemable preferred shares (Preferred
Shares), liquidation preference $50 per share, and (ii) contingent warrants to
acquire in the aggregate 5% of each class of outstanding junior shares (as
defined) of the Company on a fully diluted basis as of February 1, 1998, which
resulted in gross proceeds to the Company of $285 million and proceeds net of
underwriting discounts, advisory fees and expenses of $274 million. Dividends on
the Preferred Shares will accrue from January 31, 1997 and will be payable
quarterly commencing on May 1, 1997 at an annual rate of 14% of the liquidation
preference thereof. Dividends may be paid, at the Company's option, on any
dividend payment date occurring on or prior to February 1, 2002 either in cash
or by issuing additional Preferred Shares with an aggregate liquidation
preference equal to the amount of such dividends. The Company is required to
redeem all of the Preferred Shares outstanding on February 1, 2009 at a
redemption price equal to 100% of the liquidation preference thereof, plus
accumulated and unpaid dividends to the date of redemption.
 
    Subject to certain conditions, the Preferred Shares are exchangeable in
whole, but not in part, at the option of the Company, on any dividend payment
date, for the 14% senior subordinated notes (Senior Subordinated Notes) due
February 1, 2009 of the Company. All terms and conditions of the Senior
Subordinated Notes would be substantially the same as those of the Preferred
Shares.
 
    The contingent warrants are only exercisable on any business day after
February 1, 1998 if a Qualifying Event has not occurred on or prior to February
1, 1998. A Qualifying Event means a public equity offering (as defined) or one
or more strategic equity investments (as defined) which in either case results
in aggregate net proceeds to the Company of not less than $75 million.
 
    In the event of a change in control of the Company, the Company will be
required to offer to purchase all of the then outstanding Preferred Shares at a
price equal to 101% of the liquidation preference thereof, plus accumulated and
unpaid dividends to the date of redemption.
 
    ACQUISITION
 
    On February 4, 1997, the Company completed the acquisition of substantially
all of the assets of Linkatel Pacific, L.P. (Linkatel), a Los Angeles-based
competitive access telecommunications provider. At the time of acquisition,
Linkatel operated an 80 mile fiber optic telecommunications network covering
several markets in the Orange and Los Angeles county areas. The acquired assets
consist primarily of fiber optic network equipment and rights-of-way. The
Company plans to expand the network and add switching facilities in order to
provide switched local services during 1997. The total purchase price of $42.5
million consisted of a cash payment of $36.1 million, the repayment of debt of
$5.6 million and the assumption of net liabilities of $0.8 million.
 
                                      F-26
<PAGE>
                NEXTLINK COMMUNICATIONS, L.L.C. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1996
 
12. SUBSEQUENT EVENTS: (CONTINUED)
    The assets acquired and consideration given were as follows (in thousands):
 
<TABLE>
<S>                                                                 <C>
Fair value of tangible assets and liabilities acquired............  $  12,003
Fair value of intangible assets acquired..........................     29,682
                                                                    ---------
                                                                    $  41,685
                                                                    ---------
                                                                    ---------
 
Cash paid for assets, including repayment of debt.................  $  41,685
                                                                    ---------
                                                                    ---------
</TABLE>
 
                                      F-27
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholders of
  Sound Response Corporation:
 
    We have audited the accompanying statements of operations of Sound Response
Corporation (an Oregon corporation) for the years ended December 31, 1993 and
1994, and for the eight months ended August 31, 1995. These financial statements
are the responsibility of the Company's management. Our responsibility is to
express an opinion on these financial statements based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the statements of operations referred to above present
fairly, in all material respects, the results of operations of Sound Response
Corporation for the years ended December 31, 1993 and 1994, and for the eight
months ended August 31, 1995, in conformity with generally accepted accounting
principles.
 
                                          ARTHUR ANDERSEN LLP
 
Seattle, Washington,
 
March 22, 1996
 
                                      F-28
<PAGE>
                           SOUND RESPONSE CORPORATION
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                        EIGHT
                                                                              YEARS ENDED              MONTHS
                                                                              DECEMBER 31,              ENDED
                                                                      ----------------------------   AUGUST 31,
                                                                          1993           1994           1995
                                                                      -------------  -------------  -------------
<S>                                                                   <C>            <C>            <C>
REVENUE.............................................................  $   1,888,805  $   3,232,907  $   8,285,795
                                                                      -------------  -------------  -------------
COST AND EXPENSES:
    Operating.......................................................        606,690        885,781      2,565,889
    Selling, general and administrative.............................      1,094,155      1,889,106      3,330,860
    Depreciation and amortization...................................         70,410        102,012        151,328
                                                                      -------------  -------------  -------------
                                                                          1,771,255      2,876,899      6,048,077
                                                                      -------------  -------------  -------------
INCOME FROM OPERATIONS..............................................        117,550        356,008      2,237,718
INTEREST EXPENSE....................................................         17,563         20,320         16,848
                                                                      -------------  -------------  -------------
NET INCOME..........................................................  $      99,987  $     335,688  $   2,220,870
                                                                      -------------  -------------  -------------
                                                                      -------------  -------------  -------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-29
<PAGE>
                           SOUND RESPONSE CORPORATION
 
                         NOTES TO FINANCIAL STATEMENTS
 
                                AUGUST 31, 1995
 
1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
  ORGANIZATION AND PRINCIPLES OF CONSOLIDATION
 
    The financial statements include the accounts of Sound Response Corporation,
an Oregon S corporation. The Company was formed August 12, 1991, and is
principally engaged in the ownership and operation of enhanced or intelligent
communications services.
 
  REVENUE RECOGNITION
 
    The Company recognizes revenue in the period that service is provided. Bad
debt expense of $2,952, $28,739 and $40,000, are included in selling, general
and administrative expenses for the periods ended December 31, 1993 and 1994,
and August 31, 1995, respectively.
 
  PROPERTY AND EQUIPMENT
 
    Property and equipment are stated at cost. Provisions for depreciation are
computed using the straight-line method over estimated useful lives, which range
from five to seven years, beginning in the month an asset is put into service.
Leasehold improvements are amortized using the straight-line method over the
term of the lease.
 
  INCOME TAXES
 
    The Company has been organized and operated under a subchapter S tax status
structured in a manner that is intended to result in the classification of the
Company as a partnership for federal income tax purposes. Accordingly, no
provision for income taxes has been made.
 
  CONCENTRATION OF CREDIT RISK
 
    Financial instruments which potentially subject the Company to concentration
of credit risk consist principally of accounts receivable. Concentrations of
credit risk with respect to accounts receivable are limited due to the
dispersion of the Company's customer base among different industries and
remedies provided by terms of contracts and statutes.
 
    Certain of the Company's customers provide a significant portion of the
Company's revenues. Customers providing more than 10% of the Company's revenues
during the periods ending December 31, 1993 and 1994 and August 31, 1995 are as
follows:
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,    EIGHT MONTHS
                                                                                         ENDED AUGUST
                                                              ------------------------           31,
                                                                 1993         1994           1995
                                                                 -----        -----     ---------------
<S>                                                           <C>          <C>          <C>
Number of customers.........................................           3            2              2
Percentage of revenues......................................          71%          42%            97%
</TABLE>
 
  USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets
 
                                      F-30
<PAGE>
                           SOUND RESPONSE CORPORATION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                                AUGUST 31, 1995
 
1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
and liabilities and the disclosure of contingent assets and liabilities at the
date of the financial statements and the reported amounts of revenues and
expenses during the reporting period. Actual results could differ from those
estimates.
 
2.  LONG TERM DEBT:
 
    During 1995, the Company entered into several operating line-of-credit
agreements with interest rates ranging from 9.5% to 10.5%. All agreements were
cancelled as of August 31, 1995.
 
3.  COMMITMENTS AND CONTINGENCIES:
 
    Total rent expense amounted to approximately $51,000 and $78,000 for the
years ended December 31, 1993 and 1994, respectively, and $115,000 for the eight
months ended August 31, 1995.
 
4. EMPLOYEE STOCK AWARD PLAN:
 
    During 1993, the Company established the Key Employee Stock Award Plan (the
Plan). During the years ended December 31, 1993 and 1994, and the eight months
ended August 31, 1995, 110,000, 75,000 and 2,500 shares were awarded,
respectively. Compensation expense was recorded upon award of the shares.
Compensation expense of $88,000, $142,500 and $0 was recognized in the years
ended December 31, 1993 and 1994, and the eight months ended August 31, 1995
respectively. The Plan was terminated as of August 31, 1995.
 
5. SUBSEQUENT EVENT:
 
    In September 1995, NEXTLINK Communications, L.L.C. (NEXTLINK) acquired
certain assets of the Company and immediately contributed the assets to NEXTLINK
Interactive, L.L.C. NEXTLINK Interactive, L.L.C. provides interactive nationwide
voice response and debit card services. The total cost of the acquisition was
approximately $12,193,000. Included in the cost of the acquisition are 4,411,941
units of NEXTLINK valued at $4,411,941 and $3,000,000 of deferred purchase
consideration payable to BWP, Inc. (formerly known as Sound Response
Corporation). In addition, NEXTLINK made a distribution of $905,000 to BWP,
Inc., in 1996 to satisfy certain liabilities in connection with the acquisition.
 
                                      F-31
<PAGE>
NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THE OFFER MADE BY THIS PROSPECTUS AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR BY ANY OF THE UNDERWRITERS. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,
CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE
COMPANY SINCE THE DATES AS OF WHICH INFORMATION IS GIVEN IN THIS PROSPECTUS.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH AN OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN
WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR
TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                       PAGE
                                                     ---------
<S>                                                  <C>
Prospectus Summary.................................          1
Risk Factors.......................................          9
The Company........................................         15
Use of Proceeds....................................         16
Dividend Policy....................................         16
Dilution...........................................         17
Capitalization.....................................         18
Selected Historical Consolidated Financial and
  Operating Data...................................         19
Management's Discussion and Analysis of Financial
  Condition and Results of Operations..............         22
Business...........................................         28
Management.........................................         50
Certain Relationships and Related Transactions.....         60
Security Ownership of Certain Beneficial Owners and
  Management.......................................         62
Description of Capital Stock.......................         64
Description of Certain Indebtedness................         68
Shares Eligible for Future Sale....................         71
Underwriting.......................................         72
Validity of Shares.................................         74
Experts............................................         75
Available Information..............................         75
Glossary...........................................        A-1
Index to Consolidated Financial Statements.........        F-1
</TABLE>
 
                                           SHARES
 
NEXTLINK
COMMUNICATIONS,
INC.
 
CLASS A COMMON STOCK
($.01 PAR VALUE)
 
                 [LOGO]
 
SALOMON BROTHERS INC
 
MERRILL LYNCH & CO.
 
BEAR, STEARNS & CO. INC.
 
LAZARD FRERES & CO. LLC
 
PROSPECTUS
 
DATED            , 1997
<PAGE>
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
<PAGE>
                                [ALTERNATE PAGE]
 
                             SUBJECT TO COMPLETION
                                 JULY 24, 1997
 
PROSPECTUS
                                                         [LOGO]
            SHARES
NEXTLINK COMMUNICATIONS, INC.
 
CLASS A COMMON STOCK
 
($.01 PAR VALUE)
 
All of the       shares of Class A Common Stock, par value $.01 per share (the
"Class A Common Stock"), offered hereby are being sold by NEXTLINK
Communications, Inc., a Washington corporation (the "Company" or "NEXTLINK"). Of
the       shares of Class A Common Stock offered,       shares are being offered
by the International Underwriters (as defined herein) outside the United States
and Canada (the "International Stock Offering") and       shares are being
offered by the U.S. Underwriters (as defined herein) in a concurrent offering in
the United States and Canada (the "U.S. Stock Offering" and together with the
International Stock Offering, the "Stock Offering"), subject to transfers
between the International Underwriters and the U.S. Underwriters (collectively,
the "Underwriters"). The initial public offering price and the aggregate
underwriting discount per share will be identical for the International Stock
Offering and the U.S. Stock Offering. See "Underwriting." The closing of the
International Stock Offering and the U.S. Stock Offering are conditioned upon
each other. Prior to the Stock Offering, there has been no public market for the
Class A Common Stock. It is currently estimated that the initial public offering
price will be between $          and $          per share of Class A Common
Stock. For factors to be considered in determining the initial public offering
price, see "Underwriting."
 
The Company has two classes of common stock, the Class A Common Stock and the
Class B Common Stock, $.01 par value per share (the "Class B Common Stock" and,
together with the Class A Common Stock, the "Common Stock"). The rights of the
Class A Common Stock and the Class B Common Stock are substantially identical,
except that holders of the Class A Common Stock are entitled to one vote per
share and holders of the Class B Common Stock are entitled to 10 votes per
share. The Class B Common Stock is fully convertible at any time into Class A
Common Stock, at the option of the holder, on a one-for-one basis. The Common
Stock votes as one class on all matters generally submitted to a vote of
stockholders, including the election of directors. See "Description of Capital
Stock."
 
Concurrently with the Stock Offering, the Company is offering $200 million
aggregate principal amount of    % Senior Notes due 2007 (the "New Notes")
pursuant to a registration statement filed under the Securities Act of 1933, as
amended (the "Debt Offering" and, together with the Stock Offering, the
"Offerings"). The consummation of the Stock Offering is not contingent upon the
consummation of the Debt Offering.
 
After the Stock Offering, Eagle River, L.L.C., a Washington limited liability
company that is controlled by Craig O. McCaw, will own approximately 87% of the
Class B Common Stock, representing    % of the total voting power of the
Company. See "Risk Factors--Control by Craig O. McCaw; Potential Conflicts of
Interest," "Security Ownership of Certain Beneficial Owners and Management" and
"Description of Capital Stock."
 
Application has been made to have the Class A Common Stock qualified for
inclusion in the Nasdaq National Market under the symbol "NXLK."
 
SEE "RISK FACTORS" BEGINNING ON PAGE 9 FOR A DISCUSSION OF CERTAIN FACTORS WHICH
SHOULD BE CONSIDERED BY POTENTIAL INVESTORS.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                  UNDERWRITING              PROCEEDS TO
                                        PRICE TO PUBLIC           DISCOUNT                  COMPANY (1)
<S>                                     <C>                       <C>                       <C>
Per Share.............................  $                         $                         $
Total (2).............................  $                         $                         $
</TABLE>
 
(1) Before deducting offering expenses payable by the Company, estimated to be
    $         .
 
(2) The Company has granted to the Underwriters a 30-day option to purchase up
    to an aggregate of additional shares of Class A Common Stock at the Price to
    the Public, less the Underwriting Discount, solely to cover over-allotments,
    if any. If the Underwriters exercise such option in full, the total Price to
    Public, Underwriting Discount and Proceeds to Company will be $         ,
    $         and $         , respectively. See "Underwriting."
 
The shares of Class A Common Stock are offered subject to receipt and acceptance
by the Underwriters, to prior sale and to the Underwriters' right to reject any
order in whole or in part and to withdraw, cancel or modify the offer without
notice. It is expected that delivery of the shares of Class A Common Stock
offered hereby will be made at the office of Salomon Brothers Inc, Seven World
Trade Center, New York, New York or through the facilities of The Depository
Trust Company, on or about           , 1997.
 
SALOMON BROTHERS INTERNATIONAL LIMITED
 
             MERRILL LYNCH INTERNATIONAL
 
                          BEAR, STEARNS INTERNATIONAL LIMITED

                                        LAZARD CAPITAL MARKETS
 
The date of this Prospectus is             , 1997.
<PAGE>
                                [ALTERNATE PAGE]
 
                       CERTAIN UNITED STATES FEDERAL TAX
                  CONSIDERATIONS FOR NON-UNITED STATES HOLDERS
 
    The following is a general discussion of certain United States federal
income and estate tax consequences of the ownership and disposition of Class A
Common Stock applicable to Non-U.S. Holders. In general, a "Non-U.S. Holder" is
any beneficial owner of Class A Common Stock other than (i) a citizen or
resident of the United States, (ii) a corporation or partnership created or
organized in the United States or under the laws of the United States or of any
state, (iii) an estate, the income of which is includable in gross income for
United States federal income tax purposes regardless of its source, or (iv) a
trust if (a) a court within the United States is able to exercise primary
supervision over the administration of the trust, and (b) one or more United
States fiduciaries have the authority to control all substantial decisions of
the trust. This discussion is based on current law and is for general
information only. This discussion does not address aspects of United States
federal taxation other than income and estate taxation and does not address all
aspects of income and estate taxation, nor does it consider any specific facts
or circumstances that may apply to a particular Non-U.S. Holder (including
certain U.S. expatriates). ACCORDINGLY, PROSPECTIVE INVESTORS ARE URGED TO
CONSULT THEIR TAX ADVISORS REGARDING THE UNITED STATES FEDERAL, STATE, LOCAL AND
NON-UNITED STATES INCOME AND OTHER TAX CONSEQUENCES OF HOLDING AND DISPOSING OF
SHARES OF CLASS A COMMON STOCK.
 
    An individual may, subject to certain exceptions, be deemed to be a resident
alien (as opposed to a non-resident alien) by virtue of being present in the
United States for at least 31 days in the calendar year and for an aggregate of
at least 183 days during a three year period ending in the current calendar year
(counting for such purposes all of the days present in the current year,
one-third of the days present in the immediately preceding year, and one-sixth
of the days present in the second preceding year). In addition to the
"substantial presence test" described in the immediately preceding sentence, an
alien may be treated as a resident alien if he (i) meets a lawful permanent
residence test (a so-called "green card" test) or (ii) elects to be treated as a
U.S. resident and meets the "substantial presence test" in the immediately
following year. Resident aliens are subject to U.S. federal tax as if they were
U.S. citizens.
 
DIVIDENDS
 
    In general, dividends paid to a Non-U.S. Holder will be subject to United
States withholding tax at a 30% rate (or a lower rate prescribed by an
applicable tax treaty) unless the dividends are either (i) effectively connected
with a trade or business carried on by the Non-U.S. Holder within the United
States, or (ii) if certain income tax treaties apply, attributable to a
permanent establishment in the United States maintained by the Non-U.S. Holder.
Dividends effectively connected with such a United States trade or business or
attributable to such a United States permanent establishment generally will not
be subject to United States withholding tax (if the Non-U.S. Holder files
certain forms, including Internal Revenue Service Form 4224, with the payor of
the dividend) and generally will be subject to United States federal income tax
on a net income basis, in the same manner as if the Non-U.S. Holder were a
resident of the United States. A Non-U.S. Holder that is a corporation may be
subject to an additional branch profits tax at a rate of 30% (or such lower rate
as may be specified by an applicable treaty) on the repatriation from the United
States of its "effectively connected earnings and profits," subject to certain
adjustments. To determine the applicability of a tax treaty providing for a
lower rate of withholding, dividends paid to an address in a foreign country are
presumed under current Treasury regulations to be paid to a resident of that
country absent knowledge to the contrary. Proposed Treasury regulations, which
are proposed to be effective for payments made after December 31, 1997 (the
"Proposed Regulations"), however, generally would require Non-U.S. Holders to
file an I.R.S. Form W-8 to obtain the benefit of any applicable tax treaty
providing for a lower rate of withholding tax on dividends. In addition,
 
                                       72
<PAGE>
                                [ALTERNATE PAGE]
 
under the Proposed Regulations, in the case of Class A Common Stock held by a
foreign partnership, (x) the certification requirement would generally be
applied to the partners of the partnership and (y) the partnership would be
required to provide certain information, including a United States taxpayer
identification number. The Proposed Regulations also provide look-through rules
for tiered partnerships. It is not certain whether, or in what form, the
Proposed Regulations will be adopted as final regulations. A Non-U.S. Holder
that is eligible for a reduced rate of U.S. withholding tax pursuant to a tax
treaty may obtain a refund of any excess amounts withheld by filing an
appropriate claim for refund with the Internal Revenue Service.
 
SALE OF CLASS A COMMON STOCK
 
    In general, a Non-U.S. Holder will not be subject to United States federal
income tax on any gain recognized upon the disposition of such holder's shares
of Class A Common Stock unless (i) the gain either is effectively connected with
a trade or business carried on by the Non-U.S. Holder within the United States
or, alternatively, if certain tax treaties apply, is attributable to a permanent
establishment in the United States maintained by the Non-U.S. Holder (and in
either case, the branch profits tax discussed above may also apply if the
Non-U.S. Holder is a corporation); (ii) the Non-U.S. Holder is an individual who
holds shares of Class A Common Stock as a capital asset and is present in the
United States for 183 or more days in the taxable year of disposition, and
either (a) such individual has a "tax home" (as defined for United States
federal income tax purposes) in the United States (unless the gain from the
disposition is attributable to an office or other fixed place of business
maintained by such Non-U.S. Holder in a foreign country and such gain has been
subject to a foreign income tax equal to at least 10% of the gain derived from
such disposition), or (b) the gain is attributable to an office or other fixed
place of business maintained by such individual in the United States; or (iii)
the Company is or has been a United States real property holding corporation (a
"USRPHC") for United States federal income tax purposes (which the Company does
not believe that it is or is likely to become) at any time within the shorter of
the five year period preceding such disposition or such Non-U.S. Holder's
holding period. If the Company were or were to become a USRPHC at any time
during this period, gains realized upon a disposition of Class A Common Stock by
a Non-U.S. Holder which did not directly or indirectly own more than 5% of the
Class A Common Stock during this period generally would not be subject to United
States federal income tax, provided that the Class A Common Stock is regularly
traded on an established securities market.
 
ESTATE TAX
 
    Class A Common Stock owned or treated as owned by an individual who is not a
citizen or resident (as defined for United States federal estate tax purposes)
of the United States at the time of death will be includable in the individual's
gross estate for United States federal estate tax purposes (unless an applicable
estate tax treaty provides otherwise), and therefore may be subject to United
States federal estate tax. Backup Withholding, Information Reporting and Other
Reporting Requirements The Company must report annually to the Internal Revenue
Service and to each Non-U.S. Holder the amount of dividends paid to, and the tax
withheld with respect to, each Non-U.S. Holder. These reporting requirements
apply regardless of whether withholding was reduced or eliminated by an
applicable tax treaty. Copies of this information also may be made available
under the provisions of a specific treaty or agreement with the tax authorities
in the country in which the Non-U.S. Holder resides or is established.
 
BACKUP WITHHOLDING, INFORMATION REPORTING AND OTHER REPORTING REQUIREMENTS
 
    United States backup withholding tax (which generally is imposed at the rate
of 31% on certain payments to persons that fail to furnish the information
required under the United States information reporting requirements) and
information reporting requirements (other than those discussed above
 
                                       73
<PAGE>
                                [ALTERNATE PAGE]
 
under "Dividends") generally will not apply to dividends paid on Class A Common
Stock to a Non-U.S. Holder at an address outside the United States. Backup
withholding and information reporting generally will apply, however, to
dividends paid on shares of Class A Common Stock to a Non-U.S. Holder at an
address in the United States, if such holder fails to establish an exemption or
to provide certain other information to the payor. See the discussion above with
respect to the rules applicable to foreign partnerships under the Proposed
Regulations.
 
    The payment of proceeds from the disposition of Class A Common Stock or
through a United States office of a broker will be subject to information
reporting and backup withholding unless the owner, under penalties of perjury,
certifies, among other things, its status as a Non-U.S. Holder or otherwise
establishes an exemption. The payment of proceeds from the disposition of Class
A Common Stock to or through a non-U.S. office of a non-U.S. broker generally
will not be subject to backup withholding and information reporting except as
noted below. In the case of proceeds from a disposition of Class A Common Stock
paid to or through a non-U.S. office of a broker that is (i) a United States
person, (ii) a "controlled foreign corporation" for United States federal income
tax purposes or (iii) a foreign person 50% or more of whose gross income from
certain periods is effectively connected with a United States trade or business,
information reporting (but not backup withholding) will apply unless the broker
has documentary evidence in its files that the holder or beneficial owner is a
Non-U.S. Holder (and the broker has not actual knowledge to the contrary).
Proposed regulations state that backup withholding will not apply to such
payments unless the broker has actual knowledge that the payee is a U.S. person.
 
    Backup withholding is not an additional tax. Any amounts withheld under the
backup withholding rules from a payment to a Non-U.S. Holder will be refunded or
credited against the Non-U.S. Holder's United States federal income tax
liability, if any, provided that the required information is furnished to the
Internal Revenue Service.
 
                                       74
<PAGE>
                                [Alternate Page]
 
                                  UNDERWRITING
 
    Subject to the terms and conditions set forth in an underwriting agreement
among the Company and the International Underwriters (the "International
Underwriting Agreement"), the Company has agreed to sell to each of the
International Underwriters named below (the "International Underwriters"), for
whom Salomon Brothers International Limited, Merrill Lynch International, Bear,
Stearns International Limited and Lazard Capital Markets are acting as the
international representatives (the "International Representatives"), and each of
the International Underwriters has severally agreed to purchase from the Company
the aggregate number of shares of Class A Common Stock set forth opposite its
name below:
 
<TABLE>
<CAPTION>
                                                                                    NUMBER OF
INTERNATIONAL UNDERWRITERS                                                           SHARES
- ---------------------------------------------------------------------------------  -----------
<S>                                                                                <C>
Salomon Brothers International Limited...........................................
Merrill Lynch International......................................................
Bear, Stearns International Limited..............................................
Lazard Capital Markets...........................................................
 
                                                                                   -----------
      Total......................................................................
                                                                                   -----------
                                                                                   -----------
</TABLE>
 
    The Company has been advised by the Representatives that the several
International Underwriters propose initially to offer the shares of Class A
Common Stock to the public at the public offering price set forth on the cover
page of this Prospectus, and to certain dealers at such price less a concession
not in excess of $         per share. The International Underwriters may allow,
and such dealers may reallow, a concession not in excess of $         per share
to certain other dealers. After the initial public offering, the public offering
price and such concessions may be changed.
 
    The Company has granted to the International Underwriters and the U.S.
Underwriters (the "U.S. Underwriters" and, collectively, with the International
Underwriters, the "Underwriters") an option, exercisable within 30 days of the
date of this Prospectus, to purchase up to additional shares of Class A Common
Stock to cover over-allotments, if any, at the price to the public set forth on
the cover page of this Prospectus less the Underwriting Discount. To the extent
that the Underwriters exercise such option, in whole or in part, each
Underwriter will have a firm commitment, subject to certain conditions, to
purchase a number of option shares proportionate to such Underwriter's initial
commitment.
 
    The Company has entered into a U.S. Underwriting Agreement with the U.S.
Underwriters named therein, for whom Salomon Brothers Inc, Merrill Lynch,
Pierce, Fenner & Smith Incorporated, Bear, Stearns & Co. Inc. and Lazard Freres
& Co. LLC are acting as the representatives (the "U.S. Representatives," and
together with the International Representatives, the "Representatives"),
providing for the concurrent offer and sale of       shares of Class A Common
Stock (in addition to the shares covered by the over-allotment option described
above) in the United States and Canada. Both the International Underwriting
Agreement and the U.S. Underwriting Agreement provide that the obligations of
the International Underwriters and the U.S. Underwriters are such that if any of
the shares of Class A Common Stock are purchased by the International
Underwriters pursuant to the International Underwriters Agreement, or by the
U.S. Underwriters pursuant to the U.S. Underwriting Agreement, all the shares of
Class A Common Stock agreed to be purchased by either the International
Underwriters or the U.S. Underwriters, as the case may be, pursuant to their
respective agreements must be so purchased. The price to public and underwriting
discount per share of Class A Common Stock for the International Stock Offering
and the U.S. Stock Offering will be identical. The closing of the U.S. Stock
Offering is a condition to the closing of the International Stock Offering and
the closing of the International Offering is a condition to the closing of the
U.S. Stock Offering.
 
                                       75
<PAGE>
                                [ALTERNATE PAGE]
 
    Each International Underwriter has severally agreed that, as part of the
distribution of the       shares of Class A Common Stock offered by the
International Underwriters, (i) it is not purchasing any shares of Class A
Common Stock for the account of any United States or Canadian Person and
 
(ii) it has not offered or sold, and will not offer or sell, directly or
indirectly, any shares of Class A Common Stock or distribute this Prospectus to
any person within the United States or Canada or to any United States or
Canadian Person. Each U.S. Underwriter has severally agreed that, as part of the
distribution of the       shares of Class A Common Stock by the U.S.
Underwriters, (i) it is not purchasing any shares of Class A Common Stock for
the account of anyone other than a United States or Canadian Person, and (ii) it
has not offered or sold, and will not offer or sell, directly or indirectly, any
shares of Class A Common Stock or distribute any Prospectus relating to the U.S.
Stock Offering to any person outside the United States or Canada or to anyone
other than a United States or Canadian Person.
 
    The foregoing limitations do not apply to stabilization transactions or to
certain other transactions specified in the Agreement Between U.S. Underwriters
and International Underwriters. "United States or Canadian Person" means any
person who is a national or resident of the United States or Canada, any
corporation, partnership or other entity created or organized in or under the
laws of the United States or Canada or of any political subdivision thereof, and
any estate or trust which is subject to United States or Canadian federal income
taxation, regardless of the source of its income (other than the foreign branch
of any United States or Canadian Person), and includes any United States or
Canadian branch of a person other than a United States or Canadian Person.
 
    Pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, sales may be made between the International Underwriters and the
U.S. Underwriters of such number of shares of Class A Common Stock as may be
mutually agreed. The price of any shares of Class A Common Stock so sold shall
be the public offering price, less an amount not greater than the concession to
securities dealers. To the extent that there are sales between the International
Underwriters and the U.S. Underwriters pursuant to the Agreement Between U.S.
Underwriters and International Underwriters, the number of shares of Class A
Common Stock initially available for sale by the International Underwriters or
by the U.S. Underwriters may be more or less than the amount specified on the
cover page of this Prospectus.
 
    Each International Underwriter has severally represented and agreed that:
(i) it is not offered or sold and, prior to the date six months after the
closing date of the Stock Offering, will not offer to sell any shares of Class A
Common Stock to persons in the United Kingdom except to persons whose ordinary
activities involve them in acquiring, holding, managing or disposing of
investments (as principal or agent) for the purposes of their businesses or
otherwise in circumstances which have not resulted and will not result in an
offer to the public in the United Kingdom within the meaning of the Public
Offers of Securities Regulations 1995 (the "Regulations"); (ii) it has complied
and will comply with all applicable provisions of the Financial Services Act
1986 and the Regulations with respect to anything done by it in relation to the
shares of Class A Common Stock in, from or otherwise involving the United
Kingdom; (iii) it has only issued or passed on or will only issue or pass on in
the United Kingdom any document received by it in connection with the issue of
the shares of Class A Common Stock, to a person who is of a kind described in
Article 11(3) of the Financial Services Act 1986 (Investment Advertisements)
(Exemptions) Order 1996, or is a person to whom the document may otherwise
lawfully be issued or passed on.
 
    Purchasers of the shares of Class A Common Stock offered hereby may be
required to pay stamp taxes and other charges in accordance with the laws and
practices of the country of purchase in addition to the offering price set forth
on the cover page thereof.
 
                                       76
<PAGE>
                                [ALTERNATE PAGE]
 
    The International Underwriting Agreement provides that the Company will
indemnify the several International Underwriters against certain liabilities,
including liabilities under the Securities Act, or contribute to payments the
International Underwriters may be required to make in respect thereof.
 
    The Company, its directors and executive officers and certain stockholders
have each agreed with the Underwriters that they will not offer, sell or
contract to sell, or otherwise dispose of, directly or indirectly, or announce
an offering of, any shares of Class A Common Stock or any securities convertible
into, or exchangeable for, shares of Class A Common Stock for a period of 180
days from the date of this Prospectus, without the prior written consent of
Salomon Brothers Inc, except (a) in the case of the Company, (i) grants of
options and issuances and sales of Class A Common Stock issued pursuant to any
employee or director stock option plan, stock ownership plan or stock purchase
plan in effect on the date of the Underwriting Agreement or (ii) issuances of
Class A Common Stock upon the conversion of securities or the exercise of
warrants outstanding on the date of Underwriting Agreement; and (b) in the case
of directors, executive officers and stockholders of the Company, shares of
Class A Common Stock disposed of as bona fide gifts or pledges where the
recipients of such gifts or the pledgees, as the case may be, agree in writing
with Salomon Brothers Inc to be bound by the terms of such agreement.
 
    The Representatives have informed the Company that they do not expect sales
to accounts over which they exercise discretionary authority to exceed five
percent of the total number of shares of Class A Common Stock sold in the Stock
Offering.
 
    Prior to the Stock Offering, there has been no public market for the Class A
Common Stock. The initial public offering price will be negotiated among the
Company and the Representatives. Among the factors considered in determining the
initial public offering price of the Class A Common Stock, in addition to
prevailing market conditions, was the Company's historical performance,
estimates of the business potential and earnings prospects of the Company, an
assessment of the Company's management and the consideration of the above
factors in relation to market valuation of companies in related businesses.
There can be no assurance that the price at which shares of Class A Common Stock
will sell in the public market after the Stock Offering will not be lower than
the price at which they are sold in the Stock Offering by the Underwriters.
 
    Application has been made to have the Class A Common Stock qualified for
inclusion in the Nasdaq National Market under the symbol "NXLK."
 
    In connection with the Stock Offering, the Underwriters may purchase and
sell the Class A Common Stock in the open market in accordance with Regulation M
under the Exchange Act. These transactions may include over-allotment and
stabilizing transactions and purchase to cover syndicate short positions created
in connection with the Stock Offering. Stabilizing transactions consist of
certain bids or purchases for the purpose of preventing or retarding a decline
in the market price of the Class A Common Stock; and syndicate short positions
involve the sale by the Underwriters of a greater number of shares of Class A
Common Stock than they are required to purchase from the Company in the Stock
Offering. The Underwriters also may impose a penalty bid, whereby selling
concessions allowed to syndicate members or other broker-dealers in respect of
the securities sold in the Stock Offering for their account may be reclaimed by
the syndicate if such securities are repurchased by the syndicate in stabilizing
or covering transactions. These activities may stabilize, maintain or otherwise
affect the market price of the Class A Common Stock, which may be higher than
the price that might otherwise prevail in the open market; and these activities,
if commenced, may be discontinued at any time. These transactions may be
effected on the Nasdaq National Market in the over-the-counter market or
otherwise.
 
                                       77
<PAGE>
                                [ALTERNATE PAGE]
 
                               VALIDITY OF SHARES
 
    The validity of the Class A Common Stock will be passed upon for the Company
by Willkie Farr & Gallagher, New York, New York and for the Underwriters by
Sullivan & Cromwell, New York, New York. As to matters of Washington law,
Willkie Farr & Gallagher and Sullivan & Cromwell will rely upon the opinion of
Davis Wright Tremaine LLP, Seattle, Washington.
 
                                    EXPERTS
 
    The audited financial statements included in this Prospectus have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.
 
                             AVAILABLE INFORMATION
 
    The Company has filed with the Commission, Washington, D.C. 20549, a
Registration Statement on Form S-1, Commission File No. 333-      , under the
Securities Act with respect to the shares of Class A Common Stock offered by the
Stock Offering. This Prospectus, which is part of the Registration Statement,
does not contain all of the information set forth in the Registration Statement
and the exhibits and schedules thereto. For further information with respect to
the Company and the Class A Common Stock, reference is made to the Registration
Statement and the exhibits and schedules filed therewith. Statements contained
in this Prospectus as to the contents of any contract or any other document to
which reference is made are necessarily summaries thereof, and in each instance
reference is made to the copy of such contract or other document filed as an
exhibit to the Registration Statement, each such statement being qualified in
all respects by such reference.
 
    NEXTLINK is subject to the informational requirements of the Securities
Exchange Act of 1934 (the "Exchange Act") and in accordance therewith files
reports and other information with the Commission. Copies of the Registration
Statement, periodic reports and other information filed by the Company with the
Commission may be inspected at prescribed rates at the public reference
facilities maintained by the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. 20549, or at its regional offices located at Northwestern
Atrium Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and
Seven World Trade Center, Suite 1300, New York, New York 10048. In addition, the
Commission maintains a website that contains periodic reports and other
information filed by the Company. This website can be accessed at www.sec.gov.
Copies of such material can be also be obtained from the Company upon request by
contacting the Company at its principal executive office.
 
    The Company intends to furnish its shareholders with annual reports
containing financial statements audited by an independent public accounting firm
and quarterly reports for the first three quarters of each fiscal year
containing unaudited interim financial information.
 
                                       78
<PAGE>
                                [ALTERNATE PAGE]
 
NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THE OFFER MADE BY THIS PROSPECTUS AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR BY ANY OF THE UNDERWRITERS. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,
CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE
COMPANY SINCE THE DATES AS OF WHICH INFORMATION IS GIVEN IN THIS PROSPECTUS.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH AN OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN
WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR
TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                       PAGE
                                                     ---------
<S>                                                  <C>
Prospectus Summary.................................          1
Risk Factors.......................................          9
The Company........................................         15
Use of Proceeds....................................         16
Dividend Policy....................................         16
Dilution...........................................         17
Capitalization.....................................         18
Selected Historical Consolidated Financial and
  Operating Data...................................         19
Management's Discussion and Analysis of Financial
  Condition and Results of Operations..............         22
Business...........................................         28
Management.........................................         50
Certain Relationships and Related Transactions.....         60
Security Ownership of Certain Beneficial Owners and
  Management.......................................         62
Description of Capital Stock.......................         64
Description of Certain Indebtedness................         68
Shares Eligible for Future Sale....................         71
Certain United States Federal Tax Considerations
  for Non-United States Holders....................         72
Underwriting.......................................         75
Validity of Shares.................................         78
Experts............................................         78
Available Information..............................         78
Glossary...........................................        A-1
Index to Consolidated Financial Statements.........        F-1
</TABLE>
 
                                           SHARES
 
NEXTLINK
COMMUNICATIONS,
INC.
 
CLASS A COMMON STOCK
 
($.01 PAR VALUE)
 
                 [LOGO]
 
SALOMON BROTHERS
INTERNATIONAL LIMITED
 
MERRILL LYNCH INTERNATIONAL
 
BEAR, STEARNS INTERNATIONAL
LIMITED
 
LAZARD CAPITAL MARKETS
 
PROSPECTUS
 
DATED            , 1997
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The following is a list of the estimated expenses to be incurred by the
Company in connection with the distribution of the Class A Common Stock being
registered hereby. Except for the Securities and Exchange Commission
Registration Fee, the NASD Filing Fee and the Nasdaq National Market Listing
Fee, all amounts are estimates.
 
<TABLE>
<S>                                                                <C>
Securities and Exchange Commission Registration Fee..............  $  55,758
NASD Filing Fee..................................................     18,900
Nasdaq National Market Listing Fee...............................      *
Printing and Engraving Costs.....................................      *
Accounting Fees and Expenses.....................................      *
Legal Fees and Expenses (excluding Blue Sky).....................      *
Blue Sky Fees and Expenses.......................................      *
Transfer Agent and Registrar Fees................................      *
Miscellaneous....................................................      *
                                                                   ---------
    Total........................................................  $  --
                                                                   ---------
                                                                   ---------
</TABLE>
 
- ------------------------
 
* To be provided by amendment
 
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Section 23B.08.510 of the Revised Code of Washington authorizes Washington
corporations to indemnify their officers and directors under certain
circumstances against expenses and liabilities incurred in legal proceedings
involving such persons because of their being or having been an officer or
director. The Company's Articles of Incorporation and By-laws require
indemnification of the Company's officers and directors to the fullest extent
permitted by Washington law. The Company also maintains directors' and officers'
liability insurance.
 
    The Company's By-laws and Articles of Incorporation provide that the Company
shall, to the full extent permitted by the Washington Business Corporation Act
(the "Washington Business Act") of the State of Washington, as amended from time
to time, indemnify all directors and officers of the Company. In addition, the
Company's Articles of Incorporation contains a provision eliminating the
personal liability of directors to the Company or its shareholders for monetary
damages arising out of a breach of fiduciary duty. Under Washington law, this
provision eliminates the liability of a director for breach of fiduciary duty
but does not eliminate the personal liability of any director for (i) acts of
omissions of a director that involve intentional misconduct or a knowing
violation of law, (ii) conduct in violation of Section 23B.08.310 of the Revised
Code of Washington (which section relates to unlawful distributions) or (iii)
any transaction from which a director personally received a benefit in money,
property or services to which the director was not legally entitled.
 
    The Company intends to enter into separate indemnification agreements with
each of its directors and executive officers.
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES.
 
    In the three years preceding the filing of this Registration Statement, the
Company has issued the following securities that were not registered under the
Securities Act:
 
                                      II-1
<PAGE>
    In June 1997, the Company issued 400,000 shares of Class A Common Stock to
Comdisco, Inc. ("Comdisco") in connection with the execution of a Master Service
Agreement dated as of June 6, 1997 between the Company whereby Comdisco agreed
to provide certain telecommunications services to the company in Chicago,
Illinois, New York, New York, Atlanta, Georgia, Dallas, Texas and Philadelphia,
Pennsylvania and any other areas the parties may agree upon in the future. Such
shares of Class A Common Stock were paid in consideration of the exclusivity
agreement by Comdisco to refrain from offering its services to any other carrier
or reseller in any of the geographical areas covered by the Master Services
Agreement. Such shares of Class A Common Stock were issued in reliance upon an
exemption from registration contained in Section 4(2) of the Securities Act.
 
    On January 31, 1997, the Company, issued and sold 5,700,000 Units consisting
of (i) 14% Senior Exchangeable Redeemable Preferred Shares, liquidation
preference $50 per share and (ii) Contingent Warrants to Merrill Lynch & Co. and
Toronto Dominion Securities (USA) Inc., as representatives of several
underwriters, pursuant to an exemption from registration contained in Section
4(2) of the Securities Act.
 
    On April 25, 1996, NEXTLINK Communications, L.L.C., the predecessor to the
Company, and NEXTLINK Capital, Inc., a Washington corporation and a wholly owned
subsidiary of the Company, issued and sold $350,000,000 aggregate principal
amount of their 12 1/2% Senior Notes due April 15, 2006 to Goldman, Sachs & Co.,
Bear, Stearns & Co. Inc., Salomon Brothers Inc and Toronto Dominion Securities
(USA) Inc., as representatives of several underwriters, pursuant to an exemption
from registration contained in Section 4(2) of the Securities Act.
 
    Effective January 1, 1996, the Company issued 651,933 Class A Units to U.S.
Network Corporation in connection with the Company's acquisition of an existing
fiber optic network and switching facilities in the downtown business centers of
Cleveland, Columbus and Akron, Ohio. Such Class A Units were issued in reliance
upon an exemption from registration contained in Section 4(2) of the Securities
Act.
 
    Effective March 28, 1996, the Company merged four of its five operating
subsidiaries with newly formed entities owned by the Company (the
"Recapitalization"). As a result of these mergers, the entities and individuals
holding minority interests in the subsidiaries exchanged these interests for
3,841,207 Class A Units of the Company (representing an approximate 5.9%
ownership interest in the Company) which were valued at approximately $5.6
million. NEXTLINK Washington, L.L.C. did not participate in the merger. The
transaction has been accounted for as a purchase of minority interests.
Accordingly, the $2.9 million excess of the purchase price over the book value
of the interests acquired was recorded as goodwill. In addition to the exchange
of equity interests, the Company exchanged options to acquire equity interests
in the subsidiaries for options to acquire Class B Units in the Company. In
connection with this transaction, the Company issued 1,953,656 options with
exercise prices of $0.01 and four-year vesting schedules. These options had
substantially the same economic values and vesting schedules as the subsidiary
options which were exchanged. Such securities were issued in reliance upon an
exemption from registration contained in Section 4(2) of the Securities Act.
 
    On December 13, 1996, the Company issued 900,000 Class A Units to the prior
owners of ITC in connection with the acquisition of ITC by the Company. ITC is a
switched-based long distance reseller based in Salt Lake City, Utah with
operations in Utah, Colorado, Arizona, New Mexico and Idaho. Such Class A Units
were issued in reliance upon an exemption from registration contained in Section
4(2) of the Securities Act.
 
    At various times during 1996 and January 1997, the Company issued options
under the Amended and Restated Equity Option Plan of NEXTLINK Communications,
L.L.C. (the "EOP") to its employees to purchase an aggregate of 1,256,502 Class
B Units. The exercise prices of these options range from $0.01 (with respect to
options to purchase 177,628 Class B Units) to $0.44 (with respect to options to
purchase 724,874 Class B Units) to $3.50 (with respect to options to purchase
354,000 Class B Units).
 
                                      II-2
<PAGE>
The options granted generally vest over four years. Such options were issued in
reliance upon an exemption from registration contained in Section 4(2) of the
Securities Act.
 
    From the inception of NEXTLINK through the end of 1995, NEXTLINK's capital
and operational funding was provided on an as needed basis, primarily by Eagle
River. During this period, under NEXTLINK's limited liability company agreement,
one equity unit was issued for each dollar in cash or assets contributed to
NEXTLINK. The equity ownership units issued from time to time during the course
of this period thus reflect this one dollar to one equity unit equivalency. As
of December 31, 1996, Eagle River had contributed approximately $53.9 million to
NEXTLINK and had received approximately 53.9 million Class A Units in NEXTLINK
Communications, L.L.C., which were converted to approximately 72.3 million
shares of Class B Common Stock of the Company on January 31, 1997, including
certain issuances described below.
 
    On September 1, 1995, NEXTLINK agreed to pay $3.0 million to BWP, Inc. in
connection with the acquisition of certain assets of Sound Response Corporation.
A payment of $1.5 million was made on September 1, 1996 and an additional
payment of $1.5 million is due September 1, 1997. In addition, NEXTLINK issued
approximately 4.4 million Class A Units in NEXTLINK Communications, L.L.C.,
which were converted to approximately 5.9 million shares of Class B Common Stock
of the Company on January 31, 1997, to BWP, Inc. in connection with this asset
acquisition.
 
    On January 31, 1995, Eagle River lent NEXTLINK $3.3 million in connection
with the acquisition of certain assets from City Signal, Inc. The note was
unsecured and bore interest at the prime rate plus 2%. The note plus accrued
interest was repaid with a portion of the net proceeds of NEXTLINK's offering of
12 1/2% Notes. NEXTLINK's principal equity owner, Mr. Craig O. McCaw, through
Eagle River made advances to NEXTLINK primarily to fund NEXTLINK's capital
expenditures (excluding acquisitions) and operating losses between January 1996
and April 1996. These advances of approximately $32.2 million, including accrued
interest, were repaid using a portion of the net proceeds of the offering of the
12 1/2% Notes.
 
    During 1995, Eagle River lent NEXTLINK $7.3 million in connection with asset
acquisitions and operating expenses. The note bore interest at the prime rate
plus 2% and, on December 1, 1995, was converted to equity and approximately 7.3
million Class A Units in NEXTLINK Communications, L.L.C., which, along with the
other Units owned by Eagle River, were converted to shares of Class B Common
Stock of the Company on January 31, 1997.
 
                                      II-3
<PAGE>
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
    (a) Exhibits:
 
<TABLE>
<C>        <S>
     *1.1  --Form of U.S. Underwriting Agreement.
 
     *1.2  --Form of International Underwriting Agreement
 
      3.1  --Articles of Incorporation of the Company (incorporated by reference to Exhibit 3.1
             to the Registration Statement on Form S-4 of the Company, file no. 333-23377).
 
      3.2  --By-laws of the Company (incorporated by reference to Exhibit 3.2 to the
             Registration Statement on Form S-4 of the Company, file no. 333-23377).
 
     *4.1  --Form of stock certificate of Class A Common Stock.
 
      4.2  --Indenture dated as of             , 1997 between the United States Trust Company
             of New York, as Trustee, and the Company, including form of Global Note.
 
      4.3  --Indenture dated as of April 25, 1996 between the United States Trust Company of
             New York, as Trustee, and the Company (incorporated by reference to Exhibit 4.1 to
             the Registration Statement on Form S-4 of NEXTLINK Communications, L.L.C. (the
             predecessor of the Company) file no. 333-4603).
 
      4.4  --Certificate of Designations of the Powers, Preferences and Relative Participating,
             Optional and Other Special Rights of the 14% Preferred Shares (incorporated by
             reference to Exhibit 4.3 to the Registration Statement on Form S-4 of the Company,
             file no. 333-23377).
 
     *5.1  --Opinion of Willkie Farr & Gallagher.
 
     *5.2  --Opinion of Davis Wright Tremaine, LLP.
 
     10.1  --Stock Option Plan of the Company (incorporated by reference to Exhibit 10.1 to the
             Registration Statement on Form S-4 of the Company, file no. 333-23377).
 
     10.2  --Management Agreement, dated as of April 30, 1996, by and between NEXTLINK
             Management Services, L.L.C. and Telecommunications of Nevada, L.L.C. (incorporated
             by reference to Exhibit 10.2 to the Registration Statement on Form S-4 of NEXTLINK
             Communications, L.L.C. (the predecessor of the Company) file no. 333-4603).
 
     10.3  --Collateral Pledge Agreement dated April 25, 1996 between the Company and the
             United States Trust Company of New York (incorporated by reference to Exhibit 4.2
             to the Registration Statement on Form S-4 of NEXTLINK Communications, L.L.C. (the
             predecessor of the Company) file no. 333-4603).
 
     *11   --Statement Regarding Computation of Net Loss Per Share.
 
     *21   --Subsidiaries of the Registrant.
 
     23.1  --Consent of Arthur Andersen LLP.
 
    *23.2  --Consent of Willkie Farr & Gallagher (included in their opinion filed as Exhibit
             5.1).
 
    *23.3  --Consent of Davis Wright Tremaine, LLP (included in their opinion filed as Exhibit
             5.2).
 
      24   --Powers of Attorney (included on signature pages).
</TABLE>
 
- ------------------------
 
* To be filed by amendment.
 
    (b) Financial Statement Schedules:
 
    All schedules have been omitted because they are not applicable or not
required or the required information is included in the financial statements or
notes thereto.
 
                                      II-4
<PAGE>
ITEM 22.  UNDERTAKINGS.
 
    The undersigned Registrant hereby undertakes that:
 
        (1) For the purpose of determining any liability under the Securities
    Act, the information omitted from the form of Prospectus filed as part of
    this Registration Statement in reliance upon Rule 430A and contained in a
    form of Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4)
    or 497(h) under the Securities Act shall be deemed to be part of this
    Registration Statement as of the time it was declared effective.
 
        (2) For the purpose of determining any liability under the Securities
    Act, each post-effective amendment that contains a form of Prospectus shall
    be deemed to be a new Registration Statement relating to the securities
    offered therein, and the offering of such securities at that item shall be
    deemed to be the initial bona fide public offering thereof.
 
    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions, described under Item 14 above, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission, such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Bellevue, State of
Washington, on July 24, 1997.
 
                                NEXTLINK COMMUNICATIONS, INC.
 
                                BY:  /S/ JAMES F. VOELKER
                                     -----------------------------------------
                                     James F. Voelker
                                     TITLE: PRESIDENT
 
                               POWER OF ATTORNEY
 
    KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned, being a
director or officer, or both of NEXTLINK Communications, Inc., a Washington
corporation, hereby constitutes and appoints James F. Voelker and R. Bruce
Easter, Jr., and each of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement or any
registration statement for this offering that is to be effective upon the filing
thereof pursuant to Rule 462(b) under the Securities Act, and to file the same,
with all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite, necessary or advisable to be done, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
or his substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.
 
    Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:
 
          SIGNATURE                        TITLE                    DATE
- ------------------------------  ---------------------------  -------------------
                                Chairman of the Board and          , 1997
- ------------------------------    Director
       Steven W. Hooper
 
      /s/ WAYNE M. PERRY        Vice Chairman of the Board      July 24, 1997
- ------------------------------    and Chief Executive
        Wayne M. Perry            Officer (Principal
                                  Executive Officer) and
                                  Director
 
     /s/ JAMES F. VOELKER       President and Director          July 24, 1997
- ------------------------------
       James F. Voelker
    /s/ KATHLEEN H. ISKRA       Vice President, Chief           July 24, 1997
- ------------------------------    Financial Officer
      Kathleen H. Iskra           (Principal Financial
                                  Officer and Principal
                                  Accounting Officer)
      /s/ GRAIG O. MCCAW        Director                        July 24, 1997
- ------------------------------
        Craig O. McCaw
     /s/ DENNIS WEIBLING        Director                        July 24, 1997
- ------------------------------
       Dennis Weibling
       /s/ SCOT JARVIS          Director                        July 24, 1997
- ------------------------------
         Scot Jarvis
    /s/ WILLIAM A. HOGLUND      Director                        July 24, 1997
- ------------------------------
      William A. Hoglund
 
                                      II-6

<PAGE>

                                                                    EXHIBIT 23.1



                 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the use of our 
reports (and to all references to our Firm) included in or made a part of 
this registration statement.


                                       /s/ ARTHUR ANDERSEN LLP
                                       -----------------------

Seatle, Washington,
July 22, 1997




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