UNITED STATIONERS INC
424B3, 1998-06-11
PAPER & PAPER PRODUCTS
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<PAGE>
                                             Filed Pursuant to Rule 424(b)(3)
                                                    File No. 333-52223
 
PROSPECTUS
                                2,005,507 SHARES
 
                                     [LOGO]
                                  COMMON STOCK
 
    Of the 2,005,507 shares of common stock, par value $0.10 per share (the
"Common Stock"), offered hereby, 1,500,000 shares are being offered by United
Stationers Inc. (the "Company" or "United Stationers") and 505,507 shares are
being offered by certain stockholders of the Company (the "Selling
Stockholders"). The Company will not receive any of the proceeds from the sale
of shares of Common Stock by the Selling Stockholders. See "Principal and
Selling Stockholders."
 
    The Common Stock is quoted on the Nasdaq National Market under the symbol
"USTR." On June 10, 1998, the last reported sale price of the Common Stock, as
reported on the Nasdaq National Market, was $54.3125 per share. See "Price Range
of Common Stock and Dividend Policy."
 
                             ---------------------
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 13 FOR A DISCUSSION OF CERTAIN FACTORS
THAT SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE COMMON STOCK.
                               -----------------
 
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           DISCOUNTS AND         PROCEEDS TO            SELLING
                                         PUBLIC           COMMISSIONS(1)         COMPANY(2)          STOCKHOLDERS
<S>                                <C>                  <C>                  <C>                  <C>
Per Share........................        $54.00               $2.295               $51.705              $51.705
Total(3).........................     $108,297,378          $4,602,639           $77,557,500          $26,137,239
</TABLE>
 
(1) The Company and the Selling Stockholders have agreed to indemnify the
    Underwriters (as defined) against certain liabilities, including liabilities
    arising under the Securities Act of 1933, as amended (the "Securities Act").
    See "Underwriting."
 
(2) Before deducting expenses payable by the Company (including certain expenses
    payable on behalf of the Selling Stockholders), estimated at $475,000. See
    "Underwriting."
 
(3) The Company has granted the Underwriters an option exercisable within 30
    days hereof to purchase up to an additional 300,826 shares of Common Stock
    on the same terms and conditions as set forth above solely to cover
    over-allotments, if any. If such option is exercised in full, the total
    Price to Public, Underwriting Discounts and Commissions, Proceeds to Company
    and Proceeds to Selling Stockholders will be $124,541,982, $5,293,034,
    $93,111,708 and $26,137,239, respectively. See "Underwriting."
 
                             ---------------------
 
    The shares of Common Stock are offered subject to prior sale, when, as and
if delivered to and accepted by the Underwriters and subject to certain other
conditions. The Underwriters reserve the right to withdraw, cancel or modify
said offer and to reject orders in whole or in part. It is expected that
delivery of the Common Stock will be made against payment therefor on or about
June 16, 1998 at the offices of Bear, Stearns & Co. Inc., 245 Park Avenue, New
York, New York 10167.
                             ---------------------
 
BEAR, STEARNS & CO. INC.
 
         DONALDSON, LUFKIN & JENRETTE
                        SECURITIES CORPORATION
 
                   MORGAN STANLEY DEAN WITTER
 
                            CLEARY GULL REILAND & MCDEVITT INC.
 
                  The date of this Prospectus is June 10, 1998
<PAGE>
                     [MAP ENTITLED "DISTRIBUTION NETWORK"]
 
                     [PHOTOGRAPHS OF PRODUCTS AND CATALOGS]
 
    [CHART ENTITLED "THE COMPANY'S ROLE IN THE BUSINESS PRODUCTS INDUSTRY"]
 
CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK,
INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS AND THE
IMPOSITION OF PENALTY BIDS. SEE "UNDERWRITING."
 
CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ALSO ENGAGE IN PASSIVE MARKET
MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET IN
ACCORDANCE WITH RULE 103 OF REGULATION M UNDER THE SECURITIES EXCHANGE ACT OF
1934, AS AMENDED. SEE "UNDERWRITING."
 
United Stationers-Registered Trademark- is a registered trademark and service
mark of the Company.
 
                                       2
<PAGE>
                             AVAILABLE INFORMATION
 
    The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-3 (as it may be amended, the
"Registration Statement") under the Securities Act with respect to the Common
Stock offered hereby. This Prospectus, which constitutes a part of the
Registration Statement, does not contain all of the information set forth in the
Registration Statement, certain items of which are contained in exhibits to the
Registration Statement as permitted by the rules and regulations of the
Commission. For further information with respect to the Company and the Common
Stock offered hereby, reference is made to the Registration Statement, including
the exhibits thereto, which may be inspected without charge at the public
reference facility maintained by the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549, and copies of which may be obtained from the Commission
at prescribed rates. Statements made in this Prospectus concerning the contents
of any document referred to herein are not necessarily complete. With respect to
each such document filed with the Commission as an exhibit to the Registration
Statement, reference is made to the exhibit for a more complete description of
the matter involved, and each such statement shall be deemed qualified in its
entirety by such reference.
 
    The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports, proxy statements and other information with the
Commission. Such reports, proxy statements and other information filed by the
Company with the Commission can be inspected without charge and copied, at
prescribed rates, at the Public Reference Section of the Commission at Room
1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 2549, and the
Regional Offices of the Commission at 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511, and 7 World Trade Center, New York, New York
10048. Such material may also be accessed electronically by means of the
Commission's web site on the Internet at http://www.sec.gov.
 
    The Common Stock is listed on the Nasdaq National Market, and such reports,
proxy statements and other information can also be inspected and copied at the
offices of the Nasdaq National Market, 1735 K Street, N.W., Washington, D.C.
20006.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    This Prospectus incorporates by reference documents that are not presented
herein or delivered herewith. The Company undertakes to provide without charge
to each person to whom a copy of this Prospectus has been delivered, upon the
written or oral request of any such person, a copy of any or all of the
documents incorporated by reference herein, other than the exhibits to such
documents, unless such exhibits are specifically incorporated by reference into
the information that this Prospectus incorporates. Written or oral requests for
such copies should be directed to: United Stationers Inc., 2200 East Golf Road,
Des Plaines, Illinois 60016-1267, Attention: Investor Relations, telephone
number (847) 699-5000.
 
    The following documents, which have been filed by the Company with the
Commission, are hereby incorporated by reference in this Prospectus:
 
    1.  The Company's Annual Report on Form 10-K for the fiscal year ended
       December 31, 1997;
 
    2.  The Company's Proxy Statement for the 1998 Annual Meeting of
       Stockholders filed on April 3, 1998;
 
    3.  The Company's Quarterly Report on Form 10-Q for the first quarter ended
       March 31, 1998;
 
    4.  The Company's Current Reports on Form 8-K filed on March 17, 1998, April
       20, 1998 and April 28, 1998;
 
    5.  The description of the Company's Common Stock in Item 1 of the Company's
       Registration Statement on Form 8-A filed on September 7, 1982; and
 
                                       3
<PAGE>
    6.  All documents filed by the Company pursuant to Section 13(a), 13(c), 14
       or 15(d) of the Exchange Act subsequent to the date hereof and prior to
       the termination of the Offering shall be deemed to be incorporated herein
       by reference and to be a part hereof from the date of filing of such
       documents.
 
    Any statement contained in this Prospectus or in a document incorporated or
deemed to be incorporated by reference in this Prospectus shall be deemed to be
modified or superseded for purposes of this Prospectus to the extent that a
statement contained in this Prospectus or in any other subsequently filed
document that also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
                                       4
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY, AND SHOULD BE READ IN
CONJUNCTION WITH, THE MORE DETAILED INFORMATION AND THE CONSOLIDATED FINANCIAL
STATEMENTS AND NOTES THERETO APPEARING ELSEWHERE HEREIN. EXCEPT AS OTHERWISE
NOTED, ALL INFORMATION IN THIS PROSPECTUS ASSUMES NO EXERCISE OF THE
UNDERWRITERS' OVER-ALLOTMENT OPTION. SEE "UNDERWRITING." AS USED IN THIS
PROSPECTUS, UNLESS OTHERWISE INDICATED OR THE CONTEXT OTHERWISE REQUIRES,
REFERENCES HEREIN TO THE "OFFERING" MEAN THE OFFERING OF COMMON STOCK PURSUANT
TO THIS PROSPECTUS, AND REFERENCES HEREIN TO THE "COMPANY" OR "UNITED
STATIONERS" INCLUDE (I) UNITED STATIONERS INC. ("UNITED"), AND ITS DIRECT AND
INDIRECT SUBSIDIARIES, INCLUDING UNITED STATIONERS SUPPLY CO. ("USSC"), THE
OPERATING SUBSIDIARY OF THE COMPANY, AND (II) THE BUSINESS CONDUCTED BY UNITED,
USSC, ASSOCIATED HOLDINGS, INC. ("ASSOCIATED") AND ASSOCIATED STATIONERS, INC.
("ASI"), THE OPERATING SUBSIDIARY OF ASSOCIATED, PRIOR TO THE MERGERS OF
ASSOCIATED WITH UNITED AND ASI WITH USSC ON MARCH 30, 1995 (COLLECTIVELY, THE
"MERGER"). EXCEPT AS OTHERWISE INDICATED, (I) THE PRO FORMA FINANCIAL
INFORMATION FOR THE YEAR ENDED DECEMBER 31, 1997 GIVES EFFECT TO THE OFFERING
(INCLUDING THE APPLICATION OF THE NET PROCEEDS TO THE COMPANY THEREFROM), THE
NOTES OFFERING (AS DEFINED) (INCLUDING THE APPLICATION OF THE NET PROCEEDS
THEREFROM), THE AZERTY ACQUISITION (AS DEFINED) AND THE SENIOR CREDIT FACILITIES
REFINANCING (AS DEFINED) AS IF EACH SUCH TRANSACTION HAD OCCURRED ON JANUARY 1,
1997 AND (II) THE SUPPLEMENTAL PRO FORMA FINANCIAL INFORMATION FOR THE YEAR
ENDED DECEMBER 31, 1997 GIVES EFFECT TO THE OCTOBER EQUITY OFFERING (AS DEFINED)
(INCLUDING THE APPLICATION OF THE NET PROCEEDS TO THE COMPANY THEREFROM), THE
PREFERRED STOCK REDEMPTION (AS DEFINED), THE OFFERING (INCLUDING THE APPLICATION
OF THE NET PROCEEDS TO THE COMPANY THEREFROM), THE NOTES OFFERING (INCLUDING THE
APPLICATION OF THE NET PROCEEDS THEREFROM), THE AZERTY ACQUISITION, THE SENIOR
CREDIT FACILITIES REFINANCING, THE MANAGEMENT AGREEMENTS TERMINATION (AS
DEFINED) AND THE COMPUTER SERVICES CONTRACT WRITE-OFF (AS DEFINED), AS IF EACH
SUCH TRANSACTION HAD OCCURRED ON JANUARY 1, 1997.
 
                                  THE COMPANY
 
    United Stationers is the largest broad line wholesale distributor of
business products in North America, with annual sales of more than twice its
next largest competitor. The Company offers more than 35,000 stockkeeping units
("SKUs"), including traditional office products, office furniture, information
technology products, facilities management supplies and janitorial and
sanitation supplies. The Company's customer base is comprised of more than
20,000 resellers, including office products dealers, office furniture dealers,
office products superstores, mass merchandisers, computer products resellers,
mail order companies and sanitary supply distributors. United Stationers serves
its customers through integrated nationwide networks of 41 business products
distribution centers, 18 janitorial and sanitation distribution centers and five
information technology products distribution centers. In addition to its broad
product offering, the Company provides value-added marketing and logistics
services to both manufacturers and resellers. For the year ended December 31,
1997, the Company's net sales and operating income were $2.6 billion and $70.2
million (after non-recurring charges of $64.7 million), respectively, and the
Company's supplemental pro forma net sales and operating income were $2.9
billion and $148.5 million, respectively.
 
    The Company estimates that the U.S. business products industry generated
sales of more than $120 billion in manufacturers' shipments in 1996 (based on
independent industry sources). In recent years, this industry has experienced
significant consolidation at all levels of the supply chain, including
manufacturers, wholesalers and resellers. During this period, the Company has
strengthened its competitive position by: (i) leveraging its significant scale;
(ii) emphasizing cost-effective operations and systems; (iii) stocking the
broadest range of business products in the industry; and (iv) providing a high
level of customer service, including quick and accurate order fulfillment and
consistent on-time order delivery. Throughout this consolidation, the Company
has successfully maintained relationships with a diverse customer base, with no
single reseller accounting for more than 6% of the Company's pro forma net sales
in 1997.
 
    As competition within the business products industry has increased,
resellers have focused on broadening their product offerings on a cost-effective
basis as well as providing high in-stock order fill rates with same day and
overnight delivery to end users. A primary goal of the Company is to be the
 
                                       5
<PAGE>
reseller's "partner of choice" by assisting resellers in achieving these
objectives and enabling them to increase their own profitability and return on
assets. United Stationers offers one-stop shopping to its customers by providing
a comprehensive inventory of products from more than 550 manufacturers. As the
Company's product line is much larger and broader than that which resellers can
economically stock themselves, resellers can rely on the Company to offer safety
stock (inventory back-up on high volume items) and to stock certain
slower-moving, generally higher margin products. As a result of volume
purchasing, the Company often qualifies for better pricing and terms than are
available to resellers. In addition, the Company can offer significantly lower
minimum order quantities than are available to resellers directly from
manufacturers.
 
    United Stationers also provides a broad range of value-added services to
resellers. The Company produces catalogs (available in paper form, on CD-ROM and
through the Company's web site) for its resellers to customize and use as
consumer marketing tools. For the 1998 catalog season, the Company circulated
more than 10 million broad line and specialized catalogs. The Company's order
entry systems allow resellers to place orders electronically with the Company,
thereby increasing a reseller's efficiency. Further, the Company is able to
deliver pre-sold products directly to the reseller's customers or to the
reseller for delivery to the end user without further packaging. Through its
state-of-the-art information systems and integrated nationwide networks of
distribution centers, the Company has been able to achieve a high order fill
rate, which is an important benefit to resellers in providing timely deliveries
to end users. All of these services are provided in such a manner that the end
user has no knowledge of the Company's role in the supply chain, as all catalogs
and packaging are customized with the name of the reseller, allowing the
reseller to maintain and foster end-user relationships. By utilizing the
Company's services and products, resellers have begun to realize the economic
value of reducing the number of SKUs they carry and are increasingly relying
upon the Company for direct order fulfillment. The Company believes that this
trend of "de-stocking" by resellers will continue.
 
    United Stationers is an integral part of the supply chain for resellers.
Additionally, manufacturers value the Company as both a cost-effective
distribution channel and as a sales outlet that provides broad geographic
exposure for their products. United Stationers also facilitates the introduction
of new products by manufacturers through the use of the Company's widely
distributed marketing materials. By serving as a distribution channel for
manufacturers, the Company assumes credit risk and cost-effectively breaks down
bulk shipments into individual orders for overnight delivery, allowing
manufacturers to realize efficiencies in order administration, warehousing and
freight costs. Manufacturers also rely on the Company to reach smaller resellers
who are not large enough to purchase directly due to their small order sizes and
the related high delivery costs.
 
                               BUSINESS STRATEGY
 
    United Stationers' strategy is to create value in the supply chain for both
resellers and manufacturers. By reducing the overall cost of distribution, the
Company believes its role as a wholesaler will continue to expand and that it
can achieve above industry-average growth rates by:
 
    CAPTURING A GREATER SHARE OF EXISTING CUSTOMERS' PURCHASES.  The Company
believes that it has the opportunity to capture a portion of the sales of
business products currently sold directly by manufacturers to resellers without
wholesaler involvement. Management estimates that approximately 20% of
manufacturers' shipments of business products move through wholesalers. The
Company believes that as resellers intensify their focus on asset management,
return on investment and inventory efficiency, they will continue de-stocking
and increasingly rely on United Stationers' products and services to meet
end-user requirements for a high order fill rate for a broad product assortment
available on an overnight basis.
 
    EXPANDING ITS CUSTOMER BASE.  The Company plans to continue to expand its
customer base by: (i) maintaining and building its business with commercial
dealers and contract stationers; (ii) developing additional programs for
marketing and buying groups; (iii) continuing to focus on complementary markets,
 
                                       6
<PAGE>
including specialty dealers; and (iv) expanding geographically, both within the
United States and, potentially, internationally.
 
    OFFERING A BROADER LINE OF PRODUCTS AND SERVICES.  The Company's product
line expansion plans include developing its newer product categories, such as
office furniture, information technology products, facilities management
supplies and janitorial and sanitation supplies as well as potentially offering
new products or services. The Company also plans to continue to expand its line
of private brand products.
 
    CAPITALIZING ON CROSS-SELLING OPPORTUNITIES.  The Company believes that its
various products and services are complementary and that there are significant
opportunities to cross-sell to existing customers. By implementing this
strategy, management believes the Company can enhance sales as resellers
purchase a broader selection of products offered by the Company, thereby
reducing end-user procurement costs and enhancing reseller profitability.
 
    INCREASING TECHNOLOGICAL CAPABILITIES AND UTILIZING ELECTRONIC
COMMERCE.  The Company intends to continue to invest in information systems
enhancements and customer interfaces that management believes will allow it to
capture a growing percentage of its customers' business. In addition, as the
Internet becomes increasingly important as a marketing channel, the Company is
positioned to participate in this trend with direct, on-line access by its
resellers to its 25,000 SKU general line catalog.
 
    MAKING STRATEGIC ACQUISITIONS.  The Company believes it can enhance its
growth by continuing to make strategic acquisitions. For example, the
acquisition of Lagasse Bros., Inc. ("Lagasse") in 1996 substantially increased
the Company's position in the janitorial and sanitation supplies product
category. The Company believes that the Azerty Acquisition also will expand its
product offerings and will make the Company one of the largest distributors of
computer consumable supplies in the United States. The Company intends to
continue, from time to time, to pursue acquisitions that expand its customer
base, increase its geographic reach and/or broaden its product offering.
 
                              RECENT TRANSACTIONS
 
AZERTY ACQUISITION
 
    On April 3, 1998, the Company completed the acquisition of all of the
capital stock of Azerty Incorporated, Azerty de Mexico, S.A. de C.V., Positive
ID Wholesale Inc. and AP Support Services Incorporated (collectively, the
"Azerty Acquisition"), which together comprised substantially all of the United
States and Mexican operations of the Office Products Division of
Abitibi-Consolidated Inc. (collectively, the "Azerty Business"). The aggregate
purchase price paid by the Company for the Azerty Business was approximately
$115.2 million (including fees and expenses), following an initial post-closing
adjustment and subject to final audit and review by the Company. The Azerty
Business is primarily a specialty wholesaler of computer consumables,
peripherals and accessories in the United States and Mexico. It is currently
anticipated that the Company's existing Micro United division will be integrated
with the Azerty Business. For the fiscal year ended December 31, 1997, the
Azerty Business had combined net sales and pro forma operating income of $355.4
million and $9.7 million, respectively. See "Recent Transactions--Azerty
Acquisition."
 
    The purchase price for the Azerty Business was funded from borrowings under
the Company's New Credit Facilities (as defined). See "--Senior Credit
Facilities Refinancing--The New Credit Facilities."
 
SENIOR CREDIT FACILITIES REFINANCING
 
    THE NEW CREDIT FACILITIES
 
    On April 3, 1998, in order to fund the purchase price of the Azerty
Business, refinance borrowings under the Company's then-existing senior secured
credit facilities (the "Existing Credit Facilities"), and pay related fees and
expenses in connection therewith, the Company amended and restated its existing
 
                                       7
<PAGE>
credit agreement (as amended and restated, the "New Credit Agreement") governing
its senior secured credit facilities (the "New Credit Facilities"). The New
Credit Facilities initially consisted of a $250.0 million six year revolving
credit facility (the "Revolving Credit Facility"), a $150.0 million six year
tranche A term loan facility (the "Tranche A Term Loan Facility") and a $100.0
million six and three-quarter year tranche B term loan facility (the "Tranche B
Term Loan Facility"). The net proceeds of the Notes Offering were used to
permanently repay a substantial portion of indebtedness outstanding under the
Tranche B Term Loan Facility and the remainder of such facility was permanently
repaid with proceeds from the sale of certain receivables, following which the
Tranche B Term Loan Facility was terminated. As a result of the early retirement
of the Existing Credit Facilities, approximately $9.5 million ($5.7 million net
of tax benefit of $3.8 million) of unamortized financing fees will be expensed
as a non-cash extraordinary charge during the second quarter of 1998. See
"Recent Transactions--New Credit Facilities" and "Description of Certain
Indebtedness--New Credit Facilities."
 
    RECEIVABLES SECURITIZATION PROGRAM
 
    On April 3, 1998, in connection with the refinancing of its Existing Credit
Facilities, the Company entered into a $163.0 million 364-day liquidity facility
(the "Receivables Securitization Program"), pursuant to which the Company sells
all of its U.S. dollar trade receivables (the "Eligible Receivables") (except
for certain excluded receivables) to a wholly-owned offshore, special purpose
limited liability company intended to be bankruptcy-remote (the "Receivables
Company"). The Receivables Company then transfers the Eligible Receivables to a
third-party, multi-seller (the "Third-Party Seller") asset-backed commercial
paper program. The Third-Party Seller's purchases of the Eligible Receivables
are supported by a facility between the Third-Party Seller and banks with
ratings of A-1/P-1 or higher. The Company received approximately $160.0 million
in proceeds from the initial sale of Eligible Receivables on April 3, 1998. The
proceeds to the Company from the Receivables Securitization Program were used to
reduce borrowings under the Revolving Credit Facility and repay a portion of the
Tranche B Term Loan Facility. See "Recent Transactions--Receivables
Securitization Program."
 
    The refinancing of the Company's Existing Credit Facility pursuant to the
New Credit Facilities and the Receivables Securitization Program is collectively
referred to in this Prospectus as the "Senior Credit Facilities Refinancing."
 
THE NOTES OFFERING
 
    On April 15, 1998, USSC consummated the sale (the "Notes Offering") of
$100.0 million of its 8 3/8% Senior Subordinated Notes due 2008 (the "8 3/8%
Notes") in a transaction not subject to the registration requirements of the
Securities Act. The 8 3/8% Notes were immediately resold by the initial
purchasers thereof in reliance on Rule 144A under the Securities Act. The
aggregate net proceeds to the Company (approximately $97.0 million) from the
sale of the 8 3/8% Notes were used to repay a substantial portion of the
indebtedness outstanding under the Tranche B Term Loan Facility. See "Recent
Transactions--The Notes Offering."
 
COMPUTER SERVICES CONTRACT WRITE-OFF
 
    In the second quarter of 1998, the Company will write off (the "Computer
Services Contract Write-Off") the remaining term of a contract for the provision
of computer services (as amended, the "Computer Services Contract"), which is
scheduled to expire in July 2002. Management has recently determined that the
Computer Services Contract has no future value to the Company. As a result of
the Computer Services Contract Write-Off, the Company will take a $13.9 million
non-recurring pre-tax charge ($8.3 million net of tax benefit of $5.6 million)
to write-off the remaining payments and related prepaid expense under the
Computer Services Contract. The Company anticipates that the savings from this
write-off will be approximately $3.2 million annually. See "Recent
Transactions--Computer Services Contract Write-Off" and "Unaudited Consolidated
Pro Forma Financial Statements."
 
                                       8
<PAGE>
OCTOBER EQUITY OFFERING
 
    On October 10, 1997, United completed an offering of 5,400,000 shares of
Common Stock (the "October Equity Offering"), consisting of 2,000,000 primary
shares sold by the Company and 3,400,000 secondary shares sold by certain
selling stockholders. The aggregate proceeds to United of $72.2 million were
contributed to USSC and used to (i) repurchase $50.0 million principal amount of
the Company's existing 12 3/4% Senior Subordinated Notes due 2005 (the "12 3/4%
Notes") and pay the redemption premium thereof of approximately $6.4 million,
(ii) reduce indebtedness under the Company's Existing Credit Facilities by $15.5
million and (iii) pay related fees and expenses. The repayment of indebtedness
from the proceeds of the October Equity Offering resulted in an extraordinary
loss on the early extinguishment of indebtedness of $9.8 million ($5.9 million
net of tax benefit of $3.9 million). In addition, in the fourth quarter of 1997,
the Company recognized a pre-tax non-recurring non-cash charge of $59.4 million
($35.5 million net of tax benefit of $23.9 million) related to the vesting of
Merger Incentive Options (as defined) and a non-recurring cash charge of $5.3
million ($3.2 million net of tax benefit of $2.1 million) related to the
Management Agreements Termination.
 
                            ------------------------
 
    The principal executive offices of the Company are located at 2200 East Golf
Road, Des Plaines, Illinois 60016-1267 and its telephone number at such location
is (847) 699-5000.
 
                                  THE OFFERING
 
<TABLE>
<S>                                                    <C>
Common Stock offered by the Company..................  1,500,000 shares
 
Common Stock offered by the Selling
  Stockholders(1)....................................  505,507 shares
 
Common Stock to be outstanding after the
  Offering(2)........................................  18,124,923 shares
 
Use of Proceeds......................................  To repay certain outstanding
                                                       indebtedness. See "Use of Proceeds."
 
Nasdaq National Market symbol........................  USTR
</TABLE>
 
- ------------------------
 
(1) Includes 404,485 shares of Common Stock to be issued and sold by the Selling
    Stockholders upon exercise of certain Employee Stock Options by the Selling
    Stockholders in connection with the Offering. See "Principal and Selling
    Stockholders."
 
(2) Based on the number of shares outstanding at June 10, 1998. Does not include
    (i) 1,283,489 shares of Common Stock issuable upon exercise of employee
    stock options ("Employee Stock Options") granted to certain employees and
    directors of the Company pursuant to the Company's 1992 Management Equity
    Plan, as amended (the "Management Equity Plan"), that the Company expects to
    be outstanding following the consummation of the Offering, (ii) 1,548 shares
    issuable upon exercise of certain warrants to purchase Common Stock (the
    "Warrants") or (iii) 50,000 shares issuable under the Non-Employee
    Directors' Deferred Compensation Plan. See "Description of Capital Stock."
 
                                  RISK FACTORS
 
    Prospective investors should carefully consider all of the information set
forth in this Prospectus and, in particular, should evaluate the specific
factors set forth under "Risk Factors" beginning on page 13 for risks involved
with an investment in the Common Stock offered hereby.
 
                                       9
<PAGE>
          SUMMARY CONSOLIDATED HISTORICAL AND PRO FORMA FINANCIAL DATA
 
    On March 30, 1995, Associated purchased 92.5% of the then-outstanding shares
of pre-Merger United common stock pursuant to a tender offer (the "Tender
Offer"). Immediately thereafter, Associated merged with and into United, and
ASI, a wholly owned subsidiary of Associated, merged with and into USSC, a
wholly owned subsidiary of United. Although United was the surviving corporation
in the Merger, the transaction was treated as a reverse acquisition for
accounting purposes, with Associated deemed the acquiring corporation.
Therefore, the historical income statement and other data for the year ended
December 31, 1995 reflect the financial information of Associated only for the
three months ended March 30, 1995, and the results of the post-Merger United for
the nine months ended December 31, 1995.
 
    Set forth below are (i) summary historical financial data, (ii) summary 1995
supplemental pro forma data, (iii) summary pro forma data reflecting the Senior
Credit Facilities Refinancing, the Azerty Acquisition, the Notes Offering (and
the application of the net proceeds to the Company therefrom), and the Offering
(and the application of the net proceeds to the Company therefrom), (iv) summary
1997 supplemental pro forma data reflecting the October Equity Offering (and the
application of the net proceeds to the Company therefrom), the termination of
certain management advisory service agreements effected in October 1997 (see
note 13 to the Consolidated Financial Statements of United included elsewhere
herein) (the "Management Agreements Termination"), the redemption of all of
United's outstanding shares of Series A Preferred Stock, $0.01 par value
("Series A Preferred Stock"), and Series C Preferred Stock, $0.01 par value
("Series C Preferred Stock" and, collectively with the Series A Preferred Stock,
the "Preferred Stock"), for approximately $21.3 million, which was effected in
September 1997 (the "Preferred Stock Redemption" and, collectively with the
October Equity Offering and the Management Agreements Termination, the "1997
Financing Transactions"), the cost savings associated with, the Computer
Services Contract Write-Off, the Senior Credit Facilities Refinancing, the
Azerty Acquisition, the Notes Offering (and the application of the net proceeds
to the Company therefrom) and the Offering (and the application of the net
proceeds to the Company therefrom) and (v) summary supplemental pro forma data
for the three months ended March 31, 1998 reflecting the cost savings associated
with the Computer Services Contract Write-Off, Senior Credit Facilities
Refinancing, the Azerty Acquisition, the Notes Offering (and the application of
the net proceeds to the Company therefrom) and the Offering (and the application
of the net proceeds to the Company therefrom). The summary 1995 supplemental pro
forma data, the pro forma data and the supplemental pro forma data are intended
for informational purposes only and are not necessarily indicative of either
financial position or results of operations in the future, or those that would
have occurred had the events described below occurred on the indicated dates as
described elsewhere herein. The following information should be read in
conjunction with, and is qualified in its entirety by, "Selected Consolidated
Financial Data," "Unaudited Consolidated Pro Forma Financial Statements," and
related notes thereto, "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the Consolidated Financial Statements
of the Company, together with the related notes thereto, included herein.
 
                                       10
<PAGE>
<TABLE>
<CAPTION>
                                                        YEAR ENDED                                             PRO FORMA
                                                    DECEMBER 31, 1995                  YEAR ENDED              YEAR ENDED
                                              ------------------------------          DECEMBER 31,            DECEMBER 31,
                                                  UNITED       SUPPLEMENTAL   -----------------------------  --------------
                                                HISTORICAL     PRO FORMA(1)       1996            1997          1997(2)
                                              --------------  --------------  -------------  --------------  --------------
                                                              (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>             <C>             <C>            <C>             <C>
INCOME STATEMENT DATA:
  Net sales.................................  $  1,751,462    $  2,201,860    $ 2,298,170    $  2,558,135    $  2,913,558
  Cost of goods sold........................     1,446,949       1,820,590      1,907,209       2,112,204       2,435,364
                                              --------------  --------------  -------------  --------------  --------------
  Gross profit..............................       304,513         381,270        390,961         445,931         478,194
  Operating expenses:
    Warehousing, marketing and
      administrative expenses...............       237,197         299,861(5)     277,957         311,002         333,601
    Restructuring charge(6).................         9,759              --             --              --              --
    Non-recurring charges(7)................            --              --             --          64,698          64,698
                                              --------------  --------------  -------------  --------------  --------------
  Total operating expenses..................       246,956         299,861        277,957         375,700         398,299
                                              --------------  --------------  -------------  --------------  --------------
  Income from operations....................        57,557    $     81,409        113,004          70,231          79,895
                                                              --------------
                                                              --------------
  Interest expense..........................        46,186                         57,456          53,511          41,656
  Other expense.............................            --                             --              --           9,251(8)
                                              --------------                  -------------  --------------  --------------
  Income before income taxes and
    extraordinary item......................        11,371                         55,548          16,720          28,988
  Income taxes..............................         5,128                         23,555           8,532          14,161
                                              --------------                  -------------  --------------  --------------
  Income before extraordinary item..........         6,243                         31,993           8,188          14,827
  Extraordinary item........................        (1,449)(9)                         --          (5,884)(10)       (5,884)(10)
                                              --------------                  -------------  --------------  --------------
  Net income................................         4,794                         31,993           2,304           8,943
  Preferred stock dividends issued and
    accrued.................................         1,998                          1,744           1,528           1,528
                                              --------------                  -------------  --------------  --------------
  Net income attributable to common
    stockholders............................  $      2,796                    $    30,249    $        776    $      7,415
                                              --------------                  -------------  --------------  --------------
                                              --------------                  -------------  --------------  --------------
  Net income per common
    share-- assuming dilution:
    Income before extraordinary item........  $       0.33                    $      2.03    $       0.43    $       0.79
    Extraordinary item......................         (0.11)                            --           (0.38)          (0.35)
                                              --------------                  -------------  --------------  --------------
    Net income..............................  $       0.22                    $      2.03    $       0.05    $       0.44
                                              --------------                  -------------  --------------  --------------
                                              --------------                  -------------  --------------  --------------
  Weighted average shares outstanding and
    assumed conversions (in thousands)......        12,809                         14,923          15,380          16,950
 
OTHER DATA:
  EBITDA(11)................................  $     81,241    $    111,880    $   139,046    $     96,272    $    108,903
  Adjusted EBITDA(12).......................        91,000         111,880        139,046         160,970         173,601
  EBITDA margin(13).........................           4.6%            5.1%           6.1%            3.8%            3.7%
  Adjusted EBITDA margin....................           5.2%            5.1%           6.1%            6.3%            6.0%
  Cash provided by operating activities.....  $     26,329                    $     1,609    $     41,768
  Cash used in investing activities.........      (266,291)                       (49,871)        (12,991)
  Cash (used in) provided by financing
    activities..............................      (249,773)                        47,221         (27,029)
 
OTHER DATA BEFORE CHARGES(14):
  Income from operations....................  $     67,316                    $   113,004    $    134,929    $    144,593
  Net income attributable to common
    stockholders............................        10,081                         30,249          45,364          51,988
  Net income per common share--
    assuming dilution.......................          0.79                           2.03            2.95            3.07
 
<CAPTION>
                                                                                                       SUPPLEMENTAL
                                               SUPPLEMENTAL                               PRO FORMA      PRO FORMA
                                                PRO FORMA                               THREE MONTHS   THREE MONTHS
                                                YEAR ENDED    THREE MONTHS ENDED MARCH   ENDED MARCH    ENDED MARCH
                                               DECEMBER 31,             31,                  31,            31,
                                              --------------  ------------------------  -------------  -------------
                                                 1997(3)         1997         1998        1998 (2)       1998 (4)
                                              --------------  -----------  -----------  -------------  -------------
 
<S>                                           <C>             <C>          <C>          <C>            <C>
INCOME STATEMENT DATA:
  Net sales.................................  $  2,913,558    $ 635,021    $ 712,517     $  812,240     $  812,240
  Cost of goods sold........................     2,435,364      526,279      589,455        680,505        680,505
                                              --------------  -----------  -----------  -------------  -------------
  Gross profit..............................       478,194      108,742      123,062        131,735        131,735
  Operating expenses:
    Warehousing, marketing and
      administrative expenses...............       329,653       76,704       85,037         91,312         90,510
    Restructuring charge(6).................            --           --           --             --             --
    Non-recurring charges(7)................            --           --           --             --             --
                                              --------------  -----------  -----------  -------------  -------------
  Total operating expenses..................       329,653       76,704       85,037         91,312         90,510
                                              --------------  -----------  -----------  -------------  -------------
  Income from operations....................       148,541       32,038       38,025         40,423         41,225
 
  Interest expense..........................        36,560       14,661       11,826          9,134          9,134
  Other expense.............................         9,251(8)        --           --          2,313(8)       2,313(8)
                                              --------------  -----------  -----------  -------------  -------------
  Income before income taxes and
    extraordinary item......................       102,730       17,377       26,199         28,976         29,778
  Income taxes..............................        43,805        7,368       11,108         12,403         12,725
                                              --------------  -----------  -----------  -------------  -------------
  Income before extraordinary item..........        58,925       10,009       15,091         16,573         17,053
  Extraordinary item........................            --           --           --             --             --
                                              --------------  -----------  -----------  -------------  -------------
  Net income................................        58,925       10,009       15,091         16,573         17,053
  Preferred stock dividends issued and
    accrued.................................            --          455           --             --             --
                                              --------------  -----------  -----------  -------------  -------------
  Net income attributable to common
    stockholders............................  $     58,925    $   9,554    $  15,091     $   16,573     $   17,053
                                              --------------  -----------  -----------  -------------  -------------
                                              --------------  -----------  -----------  -------------  -------------
  Net income per common
    share-- assuming dilution:
    Income before extraordinary item........  $       3.19    $    0.65    $    0.88     $     0.89     $     0.91
    Extraordinary item......................            --           --           --             --             --
                                              --------------  -----------  -----------  -------------  -------------
    Net income..............................  $       3.19    $    0.65    $    0.88     $     0.89     $     0.91
                                              --------------  -----------  -----------  -------------  -------------
                                              --------------  -----------  -----------  -------------  -------------
  Weighted average shares outstanding and
    assumed conversions (in thousands)......        18,500       14,608       17,098         18,646         18,646
OTHER DATA:
  EBITDA(11)................................  $    177,549    $  38,573    $  45,458     $   48,634     $   49,436
  Adjusted EBITDA(12).......................       177,549       38,573       45,458         48,634         49,436
  EBITDA margin(13).........................           6.1%         6.1%         6.4%           6.0%           6.1%
  Adjusted EBITDA margin....................           6.1%         6.1%         6.4%           6.0%           6.1%
  Cash provided by operating activities.....                  $  48,928    $  67,500
  Cash used in investing activities.........                     (1,612)      (3,975)
  Cash (used in) provided by financing
    activities..............................                    (40,351)     (64,388)
OTHER DATA BEFORE CHARGES(14):
  Income from operations....................  $    148,541    $  32,038    $  38,025     $   40,423     $   41,225
  Net income attributable to common
    stockholders............................        58,925        9,554       15,091         16,573         17,053
  Net income per common share--
    assuming dilution.......................          3.19         0.65         0.88           0.89           0.91
</TABLE>
 
                                       11
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                                             AS OF MARCH 31, 1998
                                                                                                          --------------------------
                                                                                                          HISTORICAL   PRO FORMA(2)
                                                                                                          -----------  -------------
                                                                                                            (DOLLARS IN THOUSANDS)
<S>                                                                                                       <C>          <C>
BALANCE SHEET DATA:
  Working capital.......................................................................................  $   431,324   $   327,374
  Total assets..........................................................................................    1,087,692     1,093,357
  Total debt(15)........................................................................................      475,201       362,669
  Total stockholders' equity............................................................................      236,629       309,834
</TABLE>
 
- --------------------------
 (1) Supplemental pro forma data for the year ended December 31, 1995 are based
     on the audited consolidated financial statements of United for the fiscal
     year ended December 31, 1995 (which includes the results of operations of
     Associated for twelve months but excludes pre-Merger United for the three
     months ended March 30, 1995) and the unaudited consolidated financial
     statements of pre-Merger United for the three-month period ended March 30,
     1995 giving effect to (i) increased depreciation expense of $1.3 million
     resulting from the write-up of certain fixed assets to fair value, (ii)
     additional incremental goodwill amortization, (iii) elimination of
     nonrecurring compensation expense of $1.5 million relating to certain
     employee stock options recognized as a result of the Merger and (iv) the
     elimination of $37.6 million in costs described in note 4 below. This
     information is presented to facilitate a better understanding of the
     combined operations prior to the Merger.
 
 (2) See "Unaudited Consolidated Pro Forma Financial Statements" for a
     discussion of the adjustments used in preparation of this data which
     reflects the Senior Credit Facilities Refinancing, the Azerty Acquisition,
     the Notes Offering and the Offering.
 
 (3) See the "Unaudited Consolidated Pro Forma Financial Statements" for a
     discussion of the adjustments used in preparation of this data which
     reflects the 1997 Financing Transactions, the Computer Services Contract
     Write-Off, Senior Credit Facilities Refinancing, the Azerty Acquisition,
     the Notes Offering and the Offering.
 
 (4) See "Unaudited Consolidated Pro Forma Financial Statements" for a
     discussion of the adjustments used in preparation of this data which
     reflects the Computer Services Contract Write-Off, the Senior Credit
     Facilities Refinancing, the Azerty Acquisition, the Notes Offering and the
     Offering.
 
 (5) Supplemental pro forma operating expenses for the year ended December 31,
     1995 exclude the following items: (i) a restructuring charge of $9.8
     million related to the Merger which was recorded by United during the year
     ended December 31, 1995, and (ii) Merger-related costs of $27.8 million
     recorded by pre-Merger United during the three months ended March 30, 1995.
 
 (6) Restructuring charge is related to United's consolidation plan in
     connection with the Merger.
 
 (7) United recognized a non-recurring non-cash charge of $59.4 million ($35.5
     million net of tax benefit of $23.9 million) and a non-recurring cash
     charge of $5.3 million ($3.2 million net of tax benefit of $2.1 million)
     related to the vesting of certain stock options (the "Merger Incentive
     Options") and the Management Agreements Termination, respectively.
 
 (8) Costs related to the sale of certain accounts receivable.
 
 (9) Loss on early retirement of debt of $2.4 million ($1.4 million net of tax
     benefit of $1.0 million).
 
 (10) Loss on early retirement of debt of $9.8 million ($5.9 million net of tax
      benefit of $3.9 million).
 
 (11) "EBITDA" refers to earnings before interest, income taxes, depreciation
      and amortization, costs associated with the sale of certain accounts
      receivable, and the extraordinary items discussed in notes 9 and 10 above.
      EBITDA is presented because it is a widely accepted financial indicator of
      a company's ability to incur and service debt and is also one of the
      financial measures by which certain covenants under the Company's New
      Credit Agreement are calculated. However, EBITDA should not be considered
      in isolation or as a substitute for net income or cash flow data prepared
      in accordance with generally accepted accounting principles or as a
      measure of a company's profitability or liquidity. Also, the EBITDA
      definition used herein may not be comparable to similarly titled measures
      reported by other companies.
 
 (12) "Adjusted EBITDA" is defined as in note 11 above except for the add back
      of restructuring and non-recurring charges discussed in notes 6 and 7
      above.
 
 (13) EBITDA margin represents EBITDA as a percentage of net sales.
 
 (14) Charges refer to the restructuring and non-recurring charges discussed in
      notes 6 and 7 above and the extraordinary items discussed in notes 9 and
      10 above.
 
 (15) Includes current maturities and capital lease obligation.
 
                                       12
<PAGE>
                                  RISK FACTORS
 
    INVESTORS SHOULD CAREFULLY CONSIDER THE FOLLOWING MATTERS IN CONNECTION WITH
AN INVESTMENT IN THE COMMON STOCK IN ADDITION TO THE OTHER INFORMATION CONTAINED
OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS. INFORMATION CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS MAY CONTAIN "FORWARD-LOOKING
STATEMENTS" WITHIN THE MEANING OF SECTION 27A OF THE SECURITIES ACT AND SECTION
21E OF THE EXCHANGE ACT, WHICH CAN BE IDENTIFIED BY THE USE OF FORWARD-LOOKING
TERMINOLOGY SUCH AS "MAY," "WILL," "EXPECT," "INTEND," "ANTICIPATE," "BELIEVE,"
"ESTIMATE" OR "CONTINUE" OR THE NEGATIVE THEREOF OR OTHER VARIATIONS THEREON OR
COMPARABLE TERMINOLOGY. ALL STATEMENTS OTHER THAN STATEMENTS OF HISTORICAL FACTS
INCLUDED IN THIS PROSPECTUS, INCLUDING THOSE REGARDING THE COMPANY'S FINANCIAL
POSITION, BUSINESS STRATEGY, PROJECTED COSTS AND PLANS AND OBJECTIVES OF
MANAGEMENT FOR FUTURE OPERATIONS ARE FORWARD-LOOKING STATEMENTS. THE FOLLOWING
MATTERS AND CERTAIN OTHER FACTORS NOTED THROUGHOUT THIS PROSPECTUS CONSTITUTE
CAUTIONARY STATEMENTS IDENTIFYING IMPORTANT FACTORS WITH RESPECT TO ANY SUCH
FORWARD-LOOKING STATEMENTS, INCLUDING CERTAIN RISKS AND UNCERTAINTIES, THAT
COULD CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY FROM THOSE IN SUCH
FORWARD-LOOKING STATEMENTS. ALL FORWARD-LOOKING STATEMENTS CONTAINED IN THIS
PROSPECTUS AND/OR ANY SUBSEQUENT WRITTEN OR ORAL FORWARD-LOOKING STATEMENTS
ATTRIBUTABLE TO THE COMPANY OR PERSONS ACTING ON BEHALF OF THE COMPANY ARE
EXPRESSLY QUALIFIED IN THEIR ENTIRETY BY SUCH CAUTIONARY STATEMENTS. THE COMPANY
UNDERTAKES NO OBLIGATION TO RELEASE THE RESULTS OF ANY REVISIONS TO THESE
FORWARD-LOOKING STATEMENTS THAT MAY BE MADE TO REFLECT ANY FUTURE EVENTS OR
CIRCUMSTANCES.
 
COMPETITION
 
    The Company operates in a highly competitive environment. The Company
competes with business products manufacturers and other national, regional and
specialty wholesalers of business products, office furniture, information
technology products, janitorial and sanitation supplies and related items. Some
of these competitors are larger than the Company and have greater financial and
other resources available to them than does the Company, and there can be no
assurance that the Company can continue to compete successfully with such
competitors. Increased competition in the business products industry, together
with increased advertising, has heightened price awareness among end users. Such
heightened price awareness has led to margin pressure on business products. In
the event that such a trend continues, the Company's profit margins could be
adversely affected. Further, the Company could be adversely affected by the loss
of a major customer. See "Business--Competition."
 
CONSOLIDATION
 
    Consolidation continues throughout all levels of the business products
industry. Consolidation of commercial dealers and contract stationers has
resulted in (i) an increased ability of those resellers to buy goods directly
from manufacturers on their own or through their participation in buying groups,
(ii) the ability of larger resellers who grow primarily through acquisitions to
qualify for larger volume rebates than the acquired companies would have
qualified for on a stand-alone basis and (iii) fewer independent resellers to
purchase from wholesalers. In addition, over the last decade, office products
superstores (which largely buy directly from manufacturers) have entered
virtually every major metropolitan market. Continuing consolidation could
adversely affect the Company's financial results. See "Business--The Business
Products Industry."
 
LEVERAGE AND DEBT SERVICE OBLIGATIONS
 
    The Company has significant debt and debt service obligations. As of March
31, 1998, after giving effect to the Senior Credit Facilities Refinancing, the
Azerty Acquisition, the Notes Offering (including the application of the net
proceeds therefrom) and the Offering (including application of the net proceeds
therefrom), the Company would have had on that date (i) outstanding long-term
indebtedness (including current maturities) of approximately $362.7 million
(excluding unused commitments) and total stockholders' equity of $309.8 million
and (ii) long-term indebtedness to total stockholders' equity ratio of 1.2 to
1.0. See "Capitalization."
 
                                       13
<PAGE>
    The degree to which the Company is leveraged could have important
consequences, including the following: (i) the Company's ability to obtain
additional financing in the future for working capital, capital expenditures,
potential acquisition opportunities, general corporate purposes or other
purposes may be impaired; (ii) a substantial portion of the Company's cash flow
from operations must be dedicated to the payment of principal and interest on
its indebtedness; (iii) the Company may be more vulnerable to economic
downturns, may be limited in its ability to withstand competitive pressures and
may have reduced flexibility in responding to changing business and economic
conditions; and (iv) fluctuations in market interest rates will affect the cost
of the Company's borrowings to the extent not covered by interest rate hedge
agreements because interest under the New Credit Facilities is payable at
variable rates. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations--Liquidity and Capital Resources" and "Description of
Certain Indebtedness."
 
    The Company's ability to service its indebtedness will be dependent on its
future performance, which will be affected by prevailing economic conditions and
financial, business and other factors, certain of which are beyond the Company's
control. The Company believes that, based upon current levels of operations, it
should be able to meet its debt service obligations when due. If, however, the
Company were unable to service its indebtedness, it would be forced to pursue
one or more alternative strategies such as selling assets, restructuring or
refinancing its indebtedness or seeking additional equity capital. There can be
no assurance that any of these strategies could be effected on satisfactory
terms, if at all, or that asset sales, restructuring or refinancing would be
permitted under the indenture governing USSC's 8 3/8% Notes (as it may be
amended and supplemented from time to time, the "8 3/8% Notes Indenture"), the
New Credit Agreement or the indenture governing the 12 3/4% Notes (as amended
and supplemented from time to time, the "12 3/4% Notes Indenture"). See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources" and "Description of Certain
Indebtedness."
 
RESTRICTIONS IMPOSED BY TERMS OF INDEBTEDNESS
 
    The 8 3/8% Notes Indenture, the New Credit Agreement and the 12 3/4% Notes
Indenture contain numerous restrictive covenants that limit the discretion of
management with respect to certain business matters. These covenants place
significant restrictions on, among other things, the ability of the Company to
incur additional indebtedness, to create liens or other encumbrances, to pay
dividends or make other payments in respect of its capital stock, to engage in
transactions with affiliates, to make certain payments, investments, loans and
guarantees and to sell or otherwise dispose of assets and merge or consolidate
with another entity. The New Credit Agreement also contains a number of
financial covenants that require the Company to meet certain financial ratios
and tests. A failure to comply with the obligations in the 8 3/8% Notes
Indenture, the New Credit Agreement or the 12 3/4% Notes Indenture could result
in an event of default under the 8 3/8% Notes Indenture, the New Credit
Agreement or the 12 3/4% Notes Indenture, which, if not cured or waived, could
permit acceleration of the indebtedness thereunder and acceleration of
indebtedness under other instruments that may contain cross-acceleration or
cross-default provisions, any of which could have a material adverse effect on
the financial condition of the Company. The New Credit Agreement restricts the
prepayment, purchase, redemption, defeasance or other payment of any of the
principal of the 8 3/8% Notes or the 12 3/4% Notes so long as any loans remain
outstanding under the New Credit Agreement. See "Description of Certain
Indebtedness."
 
INTEGRATION OF ACQUISITIONS
 
    As a result of the Azerty Acquisition and the Company's strategy of pursuing
strategic acquisitions, the Company's management will be required to manage
substantially larger operations than has historically been the case. With the
Azerty Acquisition, the Company's future operations in the information
technology products area and earnings from such operations will be largely
dependent upon the Company's ability to integrate the operations of the
Company's existing Micro United division with the Azerty Business. The Company
must, among other things, integrate management and employee personnel and
combine certain administrative, sales and information technology procedures. The
integration of the Micro
 
                                       14
<PAGE>
United business and the Azerty Business involves numerous risks, including the
potential loss of key employees and customers. There can be no assurance that
the Company will successfully integrate the Micro United business and the Azerty
Business, and a failure to do so could have a material adverse effect on the
Company's results of operations and financial condition. Additionally, the need
to focus management's attention on the integration of the Azerty Business may
limit the ability of the Company to successfully pursue acquisitions or other
opportunities related to its business for a substantial period of time.
 
CHANGING END-USER DEMANDS AND SEASONALITY
 
    The Company's sales and profitability are largely dependent on its ability
to continually enhance its product offerings in order to meet changing end-user
demands. End-users' traditional demands for business products have changed over
the last several years as a result of, among other things, the widespread use of
computers and other technological advances (resulting in the reduction in use of
traditional office supplies), efforts by various businesses to establish
"paperless" work environments, increased recycling efforts and a trend toward
non-traditional offices (such as home offices). The Company's ability to
continually monitor and react to such trends and changes in end-user demands
will be necessary to avoid adverse effects on its sales and profitability. In
addition, the Company's financial results could be adversely affected if and to
the extent that end-user demand for a broad product selection or the need for
overnight delivery were to diminish substantially or end-user demand for a
higher proportion of low margin products were to increase substantially.
 
    Although the Company's sales are relatively level throughout the year, the
Company's sales vary to the extent of seasonal differences in the buying
patterns of end users who purchase office products. In particular, the Company's
sales are generally higher than average during the month of January when many
businesses begin operating under new annual budgets. Any impact upon sales
during this peak season could have a disproportionate effect on the Company's
results of operations for the full year. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Seasonality."
 
DEPENDENCE ON KEY SUPPLIERS
 
    Although the Company regularly carries products and accessories supplied by
more than 550 business products manufacturers, approximately 27.6% of the
Company's total purchases (on a pro forma basis) during the year ended December
31, 1997 were derived from products purchased from the Company's three largest
suppliers. The Company's purchasing agreements with such suppliers are generally
terminable at any time or on short notice, with or without cause, and, while the
Company considers its relationships with its suppliers to be good, there can be
no assurance that any or all of such relationships will not be terminated or
that such relationship will continue as presently in effect. Termination of such
relationships or changes by its suppliers in their policies regarding wholesale
distributors or volume discount schedules or other marketing programs applicable
to the Company may have a material adverse effect on the Company's business.
 
IMPACT OF CHANGING MANUFACTURERS' PRICES
 
    The Company maintains substantial inventories to accommodate the prompt
service and delivery requirements of its customers. Accordingly, the Company
purchases its products on a regular basis in an effort to maintain its inventory
at levels that it believes to be sufficient to satisfy the anticipated needs of
its customers based upon historic buying practices and market conditions.
Although the Company has historically been able to pass through manufacturers'
price increases to its customers on a timely basis, competitive conditions will
influence how much of future price increases can be passed on to the Company's
customers. Conversely, when manufacturers' prices decline, lower sales prices
could result in lower margins as the Company sells existing inventory. Changes
in the prices paid by the Company for its products therefore could have a
material adverse effect on the Company's net sales, gross margins and net
income, and the timing of such changes throughout the year could adversely
impact quarterly results.
 
                                       15
<PAGE>
EFFECT OF CHANGES IN THE ECONOMY
 
    Demand for business products is affected by, among other things, white
collar employment levels. Changes in the economy resulting in decreased white
collar employment levels may therefore adversely affect the Company's operations
and profitability. In addition, pricing and, to an extent, profitability of the
Company's product offerings generally decrease under deflationary economic
conditions. Deflationary swings in the economy may therefore adversely affect
the Company's profitability.
 
POTENTIAL SERVICE INTERRUPTIONS
 
    Substantially all of the Company's shipping, warehouse and maintenance
employees at certain of the Company's facilities in Chicago, Detroit,
Philadelphia, Baltimore, Los Angeles, Minneapolis and New York City are covered
by various collective bargaining agreements that expire at various times during
the next three years. Although the Company considers its relations with
employees to be good, a prolonged labor dispute could have a material adverse
effect on the Company's business (including its ability to deliver its products
in a timely manner) as well as the Company's results of operations and financial
condition. The Company has not experienced any work stoppages during the past
five years.
 
    The Company's ability to receive and deliver products is largely dependent
on the availability of trucking and package delivery services utilized by
manufacturers and the Company. Therefore, the occurrence of a strike or other
work stoppage by any such service provider could materially affect the Company's
sales and profitability.
 
DEPENDENCE ON TECHNOLOGY; YEAR 2000 MODIFICATIONS
 
    The Company believes that the successful operation of its business depends
to a large extent on its computerized inventory management, order processing and
distribution systems. The Company may, from time to time, experience delays,
complications or expenses in integrating and operating these systems, any of
which could have a material adverse effect upon the Company's results of
operations and financial condition. While the Company believes that its computer
systems will be adequate for its future needs, such systems may require
modification, improvement or replacement as the Company grows or as technologies
make these systems obsolete. For example, the Company is currently taking steps
to make all necessary modifications to its systems for the year 2000. In 1997,
the Company incurred approximately $1.4 million of expenses related to this
issue, and expects to incur an additional $2.6 to $3.3 million of such expenses
during the next two years. For the three months ended March 31, 1998, the
Company incurred $0.3 million of such expenses. Any such modifications,
improvements or replacements may require substantial additional expenditures to
design and implement and may require interruptions in operations during periods
of implementation, any of which could have a material adverse effect on the
Company's results of operations and financial condition. Further, since
approximately 80% of the Company's orders are received electronically, any
disruption of a significant reseller's computer systems could have an adverse
impact on the Company's sales. The Company's service levels also would be
affected in the event of an interruption in operation of its telecommunications
network on a company-wide scale for an extended period of time, although the
Company has developed contingency plans to limit its exposure to such risks. See
"Business--Technology."
 
DEPENDENCE ON KEY PERSONNEL
 
    The Company's success relies on the efforts and abilities of its executive
officers and certain other key employees, particularly Mr. Frederick B. Hegi,
Jr., the Company's non-executive Chairman of the Board, Mr. Randall W.
Larrimore, President and Chief Executive Officer, Mr. Daniel H. Bushell, an
Executive Vice President and the Chief Financial Officer of the Company, and Mr.
Michael D. Rowsey and Mr. Steven R. Schwarz, each an Executive Vice President of
the Company. The loss of any of these individuals could have a material adverse
effect on the Company. The Company has entered into
 
                                       16
<PAGE>
employment agreements with the executive officers listed above. The Company
currently does not have any "key man" life insurance for its key personnel. See
"Management."
 
INFLUENCE OF CERTAIN STOCKHOLDERS
 
    As of the date of this Prospectus and after giving effect to the Offering,
Wingate Partners, L.P. ("Wingate Partners") and Wingate Partners II, L.P.
("Wingate II" and, collectively with Wingate Partners "Wingate"), Cumberland
Capital Corporation ("Cumberland") and its affiliates, and Mr. Daniel J. Good
and his affiliates will beneficially own approximately 17.7%, 1.9% and 2.4%,
respectively, of the outstanding shares of Common Stock (17.4%, 1.8% and 2.4%,
respectively, if the Underwriters' over-allotment option is exercised in full).
Two of the current nine directors of United are affiliates of Wingate Partners
or Wingate II. In addition, Mr. Gary G. Miller, who is the President and a
stockholder of Cumberland, and Mr. Good each serve as directors of United.
Consequently, such persons and their affiliates will continue to have
significant influence over the policies of the Company and any matters submitted
to a stockholder vote. See "Management--Directors and Executive Officers" and
"Principal and Selling Stockholders."
 
IMPACT OF SHARES ELIGIBLE FOR FUTURE SALE
 
    Future sales by existing stockholders could adversely affect the prevailing
market price of the Common Stock. Upon completion of this Offering, the Company
will have 18,124,923 shares of Common Stock outstanding. In addition, 1,548
shares will be issuable upon exercise of outstanding Warrants and 1,283,489
shares will be issuable upon exercise of outstanding Employee Stock Options. Of
the shares of Common Stock that will be outstanding after this Offering,
approximately 14,010,877 shares will be freely tradable without restriction or
further registration under the Securities Act. Subject to Rule 144 under the
Securities Act (as currently in effect), after expiration of certain lock-up
agreements between the Underwriters and the Company and certain of its officers
and directors and stockholders (or earlier with the consent of the
representative of the Underwriters), approximately 4,114,046 of the remaining
shares are eligible for sale in the public marketplace. In addition, certain
stockholders have previously been granted registration rights entitling them to
demand, in certain circumstances, that the Company register the shares of Common
Stock held by them for sale under the Securities Act. Following the consummation
of this Offering and expiration of the 60-day lock-up described in
"Underwriting," sales of substantial amounts of Common Stock in the public
market, pursuant to Rule 144 or otherwise, or the availability of such shares
for sale, could adversely affect the prevailing market price of the Common Stock
and impair the Company's ability to raise additional capital through the sale of
equity securities. See "Shares Eligible for Future Sale."
 
POSSIBLE ANTI-TAKEOVER EFFECTS
 
    The Company has available for issuance 1,500,000 shares of preferred stock,
which the Board of Directors is authorized to issue, in one or more series,
without any further action on the part of the Company's stockholders. At the
discretion of the Board of Directors, and subject to its fiduciary duties, the
preferred stock could be used to deter any takeover attempt, by tender offer or
otherwise. In addition, preferred stock could be issued with voting and
conversion rights which could adversely affect the voting power and/or economic
value to holders of Common Stock. The issuance of preferred stock could also
result in a series of securities outstanding that would have preferences over
the Common Stock with respect to dividends and in liquidation. No shares of
preferred stock are currently outstanding. See "Description of Capital
Stock--Preferred Stock."
 
    The Company's Restated Certificate of Incorporation (as amended from time to
time, the "Charter") and Restated Bylaws (as amended from time to time, the
"Bylaws") contain certain other provisions that may be deemed to have
anti-takeover effects and may delay, deter or prevent a takeover attempt that a
stockholder of the Company might consider to be in the best interests of the
Company or its stockholders. See "Description of Capital Stock--Special
Provisions of the Charter and Bylaws." In addition, the New Credit Agreement
provides that the occurrence of a change of control of USSC shall constitute an
event of
 
                                       17
<PAGE>
default thereunder, and the lenders thereunder may declare all borrowings
outstanding under the New Credit Agreement to become due and payable
immediately, which could have a material adverse effect on the Company and could
have the effect of deterring or delaying a takeover attempt. See "Description of
Certain Indebtedness--New Credit Facilities." Finally, the 8 3/8% Notes
Indenture and the 12 3/4% Notes Indenture each provide that, upon the occurrence
of a change of control (which term includes the acquisition by any person or
group of more than 50% of the voting power of the outstanding common stock of
either the Company or USSC or certain significant changes in the composition of
the Board of Directors of either the Company or USSC), USSC shall be obligated
to offer to repurchase all outstanding 8 3/8% Notes and 12 3/4% Notes at a
purchase price of 101% of the principal amount thereof, plus accrued and unpaid
interest, if any, to the date of redemption. Such obligation, if it arose, could
have a material adverse effect on the Company and could have the effect of
deterring or delaying a takeover attempt. See "Description of Certain
Indebtedness--12 3/4% Notes" and "--8 3/8% Notes."
 
                                       18
<PAGE>
                              RECENT TRANSACTIONS
 
AZERTY ACQUISITION
 
    On April 3, 1998, the Company completed the acquisition of all of the
capital stock of Azerty Incorporated ("Azerty"), Azerty de Mexico, S.A. de C.V.
("Azerty Mexico"), Positive ID Wholesale Inc. ("Positive ID") and AP Support
Services Incorporated ("AP Support Services"), which comprised substantially all
of the United States and Mexican operations of the Office Products Division of
Abitibi-Consolidated Inc. The aggregate purchase price paid by the Company for
the Azerty Business was approximately $115.2 million (including fees and
expenses) following an initial post-closing adjustment and subject to final
audit and review by the Company. For the fiscal year ended December 31, 1997,
the Azerty Business had combined net sales and pro forma operating income of
$355.4 million and $9.7 million, respectively.
 
    AZERTY
 
    Azerty was founded in 1983 and is a leading wholesale distributor of
computer consumables, peripherals and accessories in the United States. Azerty
serves over 12,000 major customers in the United States which consist primarily
of information product dealers and value-added resellers. Azerty distributes a
broad range of products consisting of printers, printer supplies, magnetic and
optical data storage media, workstation accessories, fax machines and basic
office products essentials. Azerty provides a high level of customer service,
including high order fill rates, late order cut-off times and guaranteed
next-day delivery for orders weighing under 100 pounds.
 
    Azerty sells through marketing employees who utilize advanced data
management and telesales capabilities that enable highly customized and
segmented marketing, whereby customers' calls are automatically routed to sales
representatives familiar with their accounts. In addition, Azerty runs catalog
marketing programs, collecting co-op allowances from vendors to produce product
catalogs for their customers. Azerty also has established a new world wide web
site on the Internet that allows on-line inventory availability, pricing and UPS
order tracking, as well as vendor and product information, applications for new
accounts and general company information.
 
    Azerty currently operates through four distribution facilities that stock
approximately 7,200 SKUs. Azerty's primary competitors are Daisytek
International, Ingram Micro, Tech Data and Merisel. For the fiscal year ended
December 31, 1997, Azerty accounted for approximately 88% of the net sales of
the combined Azerty Business.
 
    AZERTY MEXICO
 
    Azerty Mexico was founded in 1995 to distribute computer consumables,
peripherals and accessories under the Azerty name in Mexico. Azerty Mexico
operates through a single distribution facility located in Mexico City, Mexico.
 
    POSITIVE ID
 
    Positive ID is a wholesale distributor of bar code scanning products.
Founded in 1996, Positive ID has attempted to capitalize on an emerging
opportunity for wholesale distribution of products using the bar code scanning
technology that has been created by the increasing use of such technology by
small and medium-sized companies, as well as new applications in the medical and
insurance industries. Positive ID offers approximately 2,000 SKUs primarily to
information products dealers and value-added resellers and distributes products
consisting of scanners, printers, consumables, data collection terminals and
software through its distribution facility located in Tonawanda, New York.
 
                                       19
<PAGE>
    AP SUPPORT SERVICES
 
    Formed in 1996, AP Support Services is a third-party service provider that
offers telemarketing, direct response marketing, logistics and data management
services to companies that are outsourcing such non-core activities. AP Support
Services offers a unique combination of sophisticated telemarketing support and
the ability to physically handle product. The strategy of AP Support Services is
to differentiate itself as a third-party service provider by offering vendors a
broad range of services from marketing through product delivery and invoicing.
 
NEW CREDIT FACILITIES
 
    On April 3, 1998, the Company entered into the New Credit Facilities
concurrently with the closing of the Azerty Acquisition in order to fund the
purchase price of the Azerty Acquisition, refinance borrowings under the
Existing Credit Facilities and pay related fees and expenses in connection
therewith. The New Credit Facilities initially consisted of a $250.0 million
Revolving Credit Facility, a $150.0 million Tranche A Term Loan Facility and a
$100.0 million Tranche B Term Loan Facility. The net proceeds of the Notes
Offering were used to repay permanently a substantial portion of indebtedness
then outstanding under the Tranche B Term Loan Facility and the remainder of the
Tranche B Term Loan Facility was permanently repaid with proceeds from the sale
of certain receivables, following which the Tranche B Term Loan Facility was
terminated.
 
    For a description of the terms of the New Credit Facilities, see
"Description of Certain Indebtedness--New Credit Facilities."
 
RECEIVABLES SECURITIZATION PROGRAM
 
    On April 3, 1998, in connection with the refinancing of its Existing Credit
Facilities, the Company entered into the $163.0 million 364-day Receivables
Securitization Program pursuant to which the Company sells its Eligible
Receivables (except for certain excluded receivables) to the Receivables
Company, a wholly-owned offshore, special purpose limited liability company
intended to be bankruptcy-remote. The Receivables Company then transfers the
Eligible Receivables to a third-party, multi-seller asset-backed commercial
paper program. The Third-Party Seller's purchases of the Eligible Receivables
are supported by a facility between the Third-Party Seller and banks with
ratings of A-1/P-1 or higher. The sale of trade receivables includes not only
those Eligible Receivables that were existing on the closing date of the
Receivables Securitization Program, but also Eligible Receivables created
thereafter. The Company received approximately $160.0 million in proceeds from
the initial sale of Eligible Receivables on April 3, 1998. The Unaudited
Consolidated Pro Forma Financial Statements included in this Prospectus reflect
$150.0 million in proceeds from the sale of Eligible Receivables under the
Receivables Securitization Program, as this amount was deemed to more fairly
represent the average amount of receivables that would have been sold in 1997.
Management of the Company believes that the Unaudited Consolidated Pro Forma
Financial Statements included herein represent a fair presentation of how the
historical financial statements of the Company might have been affected if the
transactions described therein had been consummated at the beginning of the
periods presented. See "Unaudited Consolidated Pro Forma Financial Statements."
 
    The Chase Manhattan Bank acts as funding agent and, together with other
commercial banks rated at least A-1/P-1, provides standby liquidity funding to
support the purchase of the receivables by the Receivables Company. The proceeds
from the Receivables Securitization Program were used to reduce borrowings under
the Company's Revolving Credit Facility and repay a portion of the Tranche B
Term Loan Facility. The Receivables Company retains an interest in the Eligible
Receivables transferred to the third party. The Receivables Securitization
Program carries an effective interest rate of LIBOR plus 0.37%. As a result of
the Receivables Securitization Program, actual balance sheet assets of the
Company as of March 31, 1998 of approximately $160.0 million, consisting of
accounts receivable, have been sold to the Receivables Company and do not secure
the Company's obligations under the New Credit Facilities.
 
                                       20
<PAGE>
THE NOTES OFFERING
 
    On April 15, 1998, USSC consummated the private sale of $100.0 million of
its 8 3/8% Notes in the Notes Offering. The 8 3/8% Notes were immediately resold
by the initial purchasers thereof in reliance on Rule 144A under the Securities
Act. The 8 3/8% Notes are unsecured and are subordinated in right of payment to
all existing and future Senior Indebtedness (as defined in the 8 3/8% Notes
Indenture) of USSC, which includes indebtedness under the New Credit Facilities.
The 8 3/8% Notes rank PARI PASSU in right of payment with USSC's 12 3/4% Notes
and all other existing and future senior subordinated Indebtedness (as defined
in the 8 3/8% Notes Indenture) of USSC, and rank senior in right of payment to
all Subordinated Indebtedness (as defined in the 8 3/8% Notes Indenture) of
USSC.
 
    The 8 3/8% Notes bear interest at the rate of 8 3/8% per annum and mature on
April 15, 2008. The 8 3/8% Notes are generally not callable by USSC prior to
five years following the issue date, subject to certain exceptions. The 8 3/8%
Notes are fully and unconditionally guaranteed on a senior subordinated basis by
the Company and all of USSC's existing and future domestic Restricted
Subsidiaries (as defined in the 8 3/8% Note Indenture) that incur Indebtedness
(the "Guarantors"). In connection with the Notes Offering, the Company, USSC and
the other Guarantors entered into an exchange and registration rights agreement
with the initial purchasers thereof, providing for certain rights with respect
to exchange or registration of the 8 3/8% Notes under the Securities Act.
 
    The proceeds from the sale of the 8 3/8% Notes were used to (i) repay a
substantial portion of indebtedness outstanding under the Tranche B Term Loan
Facility and (ii) pay fees and expenses related to the Notes Offering.
 
    For a more detailed description of the terms of the 8 3/8% Notes, see
"Description of Certain Indebtedness--8 3/8% Notes."
 
COMPUTER SERVICES CONTRACT WRITE-OFF
 
    As a condition to the spinoff of ASI from the Wholesale Division of Boise
Cascade Office Products Corporation in January 1992, ASI entered into the
Computer Services Contract with a third-party service provider to perform
certain computer services.
 
    Upon completion of the systems integration between USSC and ASI, increasing
differences in the operating processes and technical environment between the
Company and the third-party service provider became evident. The Computer
Services Contract was modified to allow the Company, at its discretion, not to
perform any processing at the third-party service provider's facilities.
Accordingly, related fees were reduced. Payments made to the third-party service
provider subsequent to this latest renegotiation were effectively for disaster
recovery purposes only. The Company has recently consolidated its disaster
recovery services under an agreement with another third-party service provider.
In May 1998, the Company completed an assessment of the future utility of the
Computer Services Contract. Based upon such assessment, the Company has
determined that it is no longer feasible to use the prior third-party service
provider for disaster recovery purposes.
 
    In the second quarter of 1998, the Company will write-off the remaining term
of the Computer Services Contract. Accordingly, $2.6 million of prepaid expense
related to the Computer Services Contract has been eliminated and $2.6 million
and $8.7 million of current and long-term payments, respectively, have been
added to the supplemental pro forma March 31, 1998 balance sheet to reflect a
non-recurring $13.9 million pre-tax charge to write off the remainder of the
Computer Services Contract. A related deferred tax asset of $5.6 million will
also be recorded. This $8.3 million charge, net of tax benefit of $5.6 million,
shown as a reduction to supplemental pro forma retained earnings at March 31,
1998, has been excluded from supplemental pro forma income statement purposes as
it is non-recurring in nature.
 
    For supplemental pro forma income statement purposes, the three months ended
March 31, 1998 and the twelve months ended December 31, 1997 reflect $0.8
million and $3.2 million in cost savings, respectively, related to the Computer
Services Contract had such agreement been written off prior to each period
presented.
 
                                       21
<PAGE>
                                USE OF PROCEEDS
 
    The net proceeds to the Company from this Offering (after deducting
applicable underwriting discounts and commissions and estimated offering
expenses payable by the Company) are estimated to be approximately $77.1 million
(approximately $92.6 million if the Underwriters' over-allotment option is
exercised in full). Such net proceeds will be contributed or advanced by the
Company to USSC and used to repay a portion of the indebtedness outstanding
under the Tranche A Term Loan Facility. The repayment of indebtedness under the
Tranche A Term Loan Facility will cause a permanent reduction of the amount
borrowable thereunder.
 
    The Tranche A Term Loan Facility bears interest at a base rate (i.e., the
higher of the prime rate or federal funds rate plus 0.50%) plus 0% to 0.75% or,
at the Company's option, LIBOR plus 1.00% to 2.00%. The Tranche A Term Loan
Facility is payable in 24 quarterly installments, and matures on or about March
31, 2004.
 
    The Company will not receive any of the proceeds from the sale of the
505,507 shares of Common Stock offered by the Selling Stockholders, other than
an aggregate of approximately $6.4 million payable by the Selling Stockholders
upon exercise of Employee Stock Options in connection with the Offering, which
will be applied to the repayment of indebtedness under the New Credit
Facilities.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
    The Common Stock is quoted on the Nasdaq National Market under the symbol
"USTR." The following table sets forth on a per share basis, for the periods
indicated, the high and low closing sale prices per share for the Common Stock,
as reported by the Nasdaq National Market:
 
<TABLE>
<CAPTION>
                                                                       HIGH        LOW
                                                                     --------    -------
<S>   <C>                                                            <C>         <C>
1996
      First Quarter...............................................   $30 1/4     $21 1/2
      Second Quarter..............................................    24 1/2      19 1/2
      Third Quarter...............................................    24 1/2      17 1/2
      Fourth Quarter..............................................    23          19 1/2
1997
      First Quarter...............................................   $21 3/4     $18 3/4
      Second Quarter..............................................    27 1/4      19
      Third Quarter...............................................    38 1/4      23 7/8
      Fourth Quarter..............................................    48 5/8      37 1/4
1998
      First Quarter...............................................   $65 5/16    $43 7/8
      Second Quarter (through June 10, 1998)......................    64 1/2      54 5/16
</TABLE>
 
    On June 10, 1998, the last reported sale price of the Common Stock as quoted
on the Nasdaq National Market was $54.3125 per share, and there were
approximately 1,000 holders of record of Common Stock.
 
    The Company does not currently intend to pay any cash dividends on the
Common Stock. Furthermore, as a holding company, the ability of United to pay
dividends in the future is dependent upon the receipt of dividends or other
payments from its operating subsidiary, USSC. The payment of dividends by USSC
to the Company for purposes of paying dividends to holders of Common Stock is
restricted by the New Credit Agreement, the 8 3/8% Notes Indenture and the
12 3/4% Notes Indenture and is subject to statutory restrictions. See "Risk
Factors--Restrictions Imposed by Terms of Indebtedness" and "Description of
Certain Indebtedness."
 
                                       22
<PAGE>
                                 CAPITALIZATION
 
    The following table sets forth the unaudited capitalization of the Company
as of March 31, 1998 on a historical basis and on an as adjusted basis giving
effect to (i) the Senior Credit Facilities Refinancing, (ii) the Azerty
Acquisition, (iii) the Notes Offering (including the application of the net
proceeds therefrom) and (iv) the Offering (including the application of the net
proceeds therefrom), as described in "Use of Proceeds." The table set forth
below should be read in conjunction with the Unaudited Consolidated Pro Forma
Financial Statements and the Consolidated Financial Statements of the Company,
together with the related notes thereto, included elsewhere herein.
 
<TABLE>
<CAPTION>
                                                                                            AS OF MARCH 31, 1998
                                                                                           -----------------------
                                                                                           HISTORICAL  AS ADJUSTED
                                                                                           ----------  -----------
                                                                                           (DOLLARS IN THOUSANDS)
<S>                                                                                        <C>         <C>
Current portion of long-term debt........................................................  $   19,551   $  10,649
 
Long-term debt:
  Revolving credit facility..............................................................     224,000      57,225(1)
  Term loan facilities...................................................................     100,020      62,917
  12 3/4% Notes..........................................................................     100,000     100,000
  8 3/8% Notes...........................................................................          --     100,000
  Other long-term debt...................................................................      31,630      31,878
                                                                                           ----------  -----------
    Total long-term debt.................................................................     455,650     352,020
 
Stockholders' equity:
  Common Stock, $0.10 par value; 40,000,000 shares authorized;
    16,024,019 shares issued and outstanding (historical)................................       1,602
    17,928,504 shares issued and outstanding (as adjusted)(2)............................                   1,793
  Capital in excess of par value.........................................................     211,261     290,427
  Retained earnings......................................................................      23,766      17,614
                                                                                           ----------  -----------
 
    Total stockholders' equity...........................................................     236,629     309,834
                                                                                           ----------  -----------
    Total capitalization (including current portion of long-term debt)...................  $  711,830   $ 672,503
                                                                                           ----------  -----------
                                                                                           ----------  -----------
</TABLE>
 
- ------------------------
 
(1) The Revolving Credit Facility under the New Credit Agreement provides for
    borrowings of up to $250.0 million. See "Description of Certain
    Indebtedness--New Credit Facilities."
 
(2) Assuming Employee Stock Options exercisable for an aggregate of 540,949
    shares of Common Stock will be exercised in connection with the Offering.
    See "Principal and Selling Stockholders." Does not include (i) 1,547,039
    shares of Common Stock issuable upon exercise of Employee Stock Options
    outstanding as of March 31, 1998, as adjusted, and (ii) 1,547 shares of
    Common Stock issuable upon exercise of outstanding Warrants.
 
                                       23
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
THE COMPANY
 
    Set forth below and on the following pages are selected historical
consolidated financial data for the Company. Although United was the surviving
corporation in the Merger, the transaction was treated as a reverse acquisition
for accounting purposes, with Associated as the acquiring corporation.
Therefore, the income statement and operating and other data for the year ended
December 31, 1995 reflect the financial information of Associated only for the
three months ended March 30, 1995 and the results of post-Merger United for the
nine months ended December 31, 1995. The balance sheet data at December 31, 1995
reflects the consolidated balances of post-Merger United, including various
Merger-related adjustments.
 
    The selected consolidated financial data set forth below for the fiscal
years ended December 31, 1993 and 1994 have been derived from the audited
consolidated financial statements of Associated. The selected consolidated
financial data of the Company for the fiscal years ended December 31, 1995
(which for income statement and operating and other data includes Associated
only for the three months ended March 30, 1995 and the results of post-Merger
United for the nine months ended December 31, 1995), 1996 and 1997 have been
derived from the consolidated financial statements of the Company, which have
been audited by Ernst & Young LLP, independent auditors. The data for the three
months ended March 31, 1997 and 1998 are derived from unaudited condensed
consolidated financial statements and in the opinion of management reflect all
adjustments considered necessary for the fair presentation of such data. Results
for the three months ended March 31, 1998 are not necessarily indicative of
results that may be achieved for a full twelve-month period. All selected
consolidated financial data set forth below should be read in conjunction with,
and are qualified in their entirety by, "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Historical Results of Operations"
and "--Liquidity and Capital Resources" and the Consolidated Financial
Statements of the Company, together with the related notes thereto, included
elsewhere herein.
 
<TABLE>
<CAPTION>
                                                                                               THREE MONTHS ENDED
                                                      YEAR ENDED DECEMBER 31,                      MARCH 31,
                                       -----------------------------------------------------  --------------------
                                         1993       1994       1995       1996       1997       1997       1998
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                      (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                    <C>        <C>        <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
  Net sales..........................  $ 455,731  $ 470,185  $1,751,462 $2,298,170 $2,558,135 $ 635,021  $ 712,517
  Cost of goods sold.................    375,226    382,299  1,446,949  1,907,209  2,112,204    526,279    589,455
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Gross profit.......................     80,505     87,886    304,513    390,961    445,931    108,742    123,062
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Operating expenses:
    Warehousing, marketing and
      administrative expenses........     69,527     69,765    246,956(1)   277,957   311,002    76,704     85,037
    Non-recurring charges(2).........         --         --         --         --     64,698         --         --
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total operating expenses...........     69,527     69,765    246,956    277,957    375,700     76,704     85,037
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income from operations.............     10,978     18,121     57,557    113,004     70,231     32,038     38,025
  Interest expense...................      7,235      7,725     46,186     57,456     53,511     14,661     11,826
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income before income taxes and
    extraordinary item...............      3,743     10,396     11,371     55,548     16,720     17,377     26,199
  Income taxes.......................        781      3,993      5,128     23,555      8,532      7,368     11,108
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income before extraordinary item...      2,962      6,403      6,243     31,993      8,188     10,009     15,091
  Extraordinary item(3)..............         --         --     (1,449)        --     (5,884)        --         --
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income.........................      2,962      6,403      4,794     31,993      2,304     10,009     15,091
  Preferred stock dividends..........      2,047      2,193      1,998      1,744      1,528        455         --
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income attributable to common
    stockholders.....................  $     915  $   4,210  $   2,796  $  30,249  $     776  $   9,554  $  15,091
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income per common share--
    assuming dilution:
    Income before extraordinary
      item...........................  $    0.11  $    0.51  $    0.33  $    2.03  $    0.43  $    0.65  $    0.88
    Extraordinary item...............         --         --      (0.11)        --      (0.38)        --         --
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Net income.......................  $    0.11  $    0.51  $    0.22  $    2.03  $    0.05  $    0.65  $    0.88
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Weighted average shares outstanding
    and assumed conversions (in
    thousands).......................      8,071      8,309     12,809     14,923     15,380     14,608     17,098
  Cash dividends, declared per
    share............................  $      --  $      --  $      --  $      --  $      --  $      --  $      --
</TABLE>
 
                                       24
<PAGE>
<TABLE>
<CAPTION>
                                                                                               THREE MONTHS ENDED
                                                      YEAR ENDED DECEMBER 31,                      MARCH 31,
                                       -----------------------------------------------------  --------------------
                                         1993       1994       1995       1996       1997       1997       1998
                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                      (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                    <C>        <C>        <C>        <C>        <C>        <C>        <C>
OTHER DATA:
  EBITDA(4)..........................  $  16,481  $  23,505  $  81,241  $ 139,046  $  96,272  $  38,573  $  45,458
  Adjusted EBITDA(5).................     16,481     23,505     91,000    139,046    160,970     38,573     45,458
  EBITDA margin(6)...................        3.6%       5.0%       4.6%       6.1%       3.8%       6.1%       6.4%
  Adjusted EBITDA margin.............        3.6%       5.0%       5.2%       6.1%       6.3%       6.1%       6.4%
  Cash provided by (used in)
    operating activities.............  $ (12,084) $  14,088  $  26,329  $   1,609  $  41,768  $  48,928  $  67,500
  Cash (used in) provided by
    investing activities.............     (3,276)      (554)  (266,291)   (49,871)   (12,991)    (1,612)    (3,975)
  Cash provided by (used in)
    financing activities.............      8,095    (12,676)   249,773     47,221    (27,029)   (40,351)   (64,388)
 
OTHER DATA BEFORE CHARGES(7)(8):
  Income from operations.............  $  10,978  $  18,121  $  67,316  $ 113,004  $ 134,929  $  32,038  $  38,025
  Net income attributable to common
    stockholders.....................        915      4,210     10,081     30,249     45,364      9,544     15,091
  Net income per common share--
    assuming dilution................       0.11       0.51       0.79       2.03       2.95       0.65       0.88
</TABLE>
 
<TABLE>
<CAPTION>
                                                      AS OF DECEMBER 31,                      AS OF MARCH 31,
                                     -----------------------------------------------------  --------------------
                                       1993       1994       1995       1996       1997       1997       1998
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                               (DOLLARS IN THOUSANDS)
<S>                                  <C>        <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Working capital..................  $  57,302  $  56,454  $ 355,465  $ 404,973  $ 451,449  $ 403,269  $ 431,324
  Total assets.....................    190,979    192,479  1,001,383  1,109,867  1,148,021  1,065,172  1,087,692
  Total debt(9)....................     86,350     64,623    551,990    600,002    537,135    559,119    475,201
  Redeemable preferred stock.......     20,996     23,189     18,041     19,785         --     20,240         --
  Redeemable warrants..............      1,435      1,650     39,692     23,812         --     24,807         --
  Total stockholders' equity.......     11,422     24,775     30,024     75,820    223,308     84,369    236,629
</TABLE>
 
- ------------------------------
 
 (1) For the year ended December 31, 1995, includes restructuring charge of $9.8
     million related to United's consolidation plan in conjunction with the
     Merger.
 
 (2) In the fourth quarter of 1997, United recognized a non-recurring non-cash
     charge of $59.4 million ($35.5 million net of tax benefit of $23.9 million)
     and a non-recurring cash charge of $5.3 million ($3.2 million net of tax
     benefit of $2.1 million) related to the vesting of the Merger Incentive
     Options and Management Agreements Termination, respectively.
 
 (3) Loss on early retirement of debt of $2.4 million ($1.4 million net of tax
     benefit of $1.0 million) in 1995 and $9.8 million ($5.9 million net of tax
     benefit of $3.9 million) in 1997.
 
 (4) "EBITDA" refers to earnings before interest, income taxes, depreciation and
     amortization, costs associated with the sale of certain accounts receivable
     and the extraordinary items discussed in note 3 above. EBITDA is presented
     because it is a widely accepted financial indicator of a company's ability
     to incur and service debt and is also one of the financial measures by
     which certain covenants under the Company's New Credit Agreement are
     calculated. However, EBITDA should not be considered in isolation or as a
     substitute for net income or cash flow data prepared in accordance with
     generally accepted accounting principles or as a measure of a company's
     profitability or liquidity. Also, the EBITDA definition used herein may not
     be comparable to similarly titled measures reported by other companies.
 
 (5) "Adjusted EBITDA" is defined as in note 4 above except for the add back of
     restructuring and non-recurring charges discussed in notes 1 and 2 above.
 
 (6) EBITDA margin represents EBITDA as a percentage of net sales.
 
 (7) In the fourth quarter of 1997, United recognized a non-recurring non-cash
     charge of $59.4 million ($35.5 million net of tax benefit of $23.9 million)
     and a non-recurring cash charge of $5.3 million ($3.2 million net of tax
     benefit of $2.1 million) related to the vesting of the Merger Incentive
     Options and the Management Agreements Termination, respectively. In
     addition, during the fourth quarter of 1997, United recorded an
     extraordinary loss of $9.8 million ($5.9 million net of tax benefit of $3.9
     million) related to the early retirement of debt.
 
 (8) During 1995, United recorded a restructuring charge of $9.8 million ($5.9
     million net of tax benefit of $3.9 million) and an extraordinary loss of
     $2.4 million ($1.4 million net of tax benefit of $1.0 million) related to
     early retirement of debt.
 
 (9) Includes current maturities and capital lease obligation.
 
                                       25
<PAGE>
PRE-MERGER UNITED
 
    The selected consolidated financial data of pre-Merger United (a predecessor
of post-Merger United) set forth below for the seven months ended March 30, 1995
(at which time pre-Merger United and Associated merged to create United) have
been derived from the Consolidated Financial Statements of pre-Merger United
which have been audited by Ernst & Young LLP, independent auditors. The selected
financial data at and for the seven-month period ended March 31, 1994 are
unaudited and in the opinion of management reflect all adjustments considered
necessary for a fair presentation of such data. The selected consolidated
financial data of pre-Merger United for each of the two fiscal years ended
August 31, 1993 and 1994 have been derived from the audited consolidated
financial statements of pre-Merger United.
 
<TABLE>
<CAPTION>
                                                                                  PRE-MERGER UNITED
                                                                  --------------------------------------------------
                                                                                               SEVEN MONTHS ENDED
                                                                   YEARS ENDED AUGUST 31,   ------------------------
                                                                  ------------------------   MARCH 31,    MARCH 30,
                                                                     1993         1994         1994         1995
                                                                  -----------  -----------  -----------  -----------
                                                                    (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                               <C>          <C>          <C>          <C>
INCOME STATEMENT DATA:
Net sales.......................................................  $ 1,470,115  $ 1,473,024   $ 871,585    $ 980,575
Cost of sales...................................................    1,197,664    1,220,245     717,546      814,780
                                                                  -----------  -----------  -----------  -----------
Gross profit on sales...........................................      272,451      252,779     154,039      165,795
Operating expenses..............................................      226,337      216,485     128,594      133,098
Merger-related costs(1).........................................           --           --          --       27,780
                                                                  -----------  -----------  -----------  -----------
Income from operations..........................................       46,114       36,294      25,445        4,917
Interest expense, net...........................................        9,550       10,461       5,837        7,500
Other income, net...............................................          355          225         117           41
                                                                  -----------  -----------  -----------  -----------
Income (loss) before income taxes...............................       36,919       26,058      19,725       (2,542)
Income taxes....................................................       15,559       10,309       8,185        4,692
                                                                  -----------  -----------  -----------  -----------
Net income (loss)...............................................  $    21,360  $    15,749   $  11,540    $  (7,234)
                                                                  -----------  -----------  -----------  -----------
                                                                  -----------  -----------  -----------  -----------
Net income (loss) per common share--assuming dilution...........  $      1.15  $      0.85   $    0.62    $   (0.39)
Cash dividends declared per share...............................         0.40         0.40        0.30         0.30
 
OTHER DATA:
EBITDA(2).......................................................  $    67,712  $    57,755   $  37,665    $  17,553
EBITDA margin(3)................................................          4.6%         3.9%        4.3%         1.8%
 
BALANCE SHEET DATA (AT PERIOD END):
Working capital.................................................  $   216,074  $   239,827   $ 297,099    $ 257,600
Total assets....................................................      634,786      618,550     608,728      711,839
Total debt(4)...................................................      150,251      155,803     227,626      233,406
Total stockholders' equity......................................      237,697      246,010     243,636      233,125
</TABLE>
 
- --------------------------
(1) In connection with the Merger, pre-Merger United incurred approximately
    $27.8 million of Merger-related costs, consisting of severance payments
    under employment contracts ($9.6 million); insurance benefits under
    employment contracts ($7.4 million); legal, accounting and other
    professional services fees ($5.2 million); retirement of stock options ($3.0
    million); and fees for letters of credit related to employment contracts and
    other costs ($2.6 million).
 
(2) For purposes of this table only, EBITDA is defined as earnings before
    interest, taxes, depreciation and amortization and is presented because it
    is commonly used by certain investors and analysts to analyze and compare
    companies on the basis of operating performance and to determine a company's
    ability to service and incur debt. EBITDA should not be considered in
    isolation from, or as a substitute for, net income, cash flows from
    operating activities or other consolidated income or cash flow statement
    data prepared in accordance with generally accepted accounting principles or
    as a measure of profitability or liquidity.
 
(3) EBITDA margin represents EBITDA as a percentage of net sales.
 
(4) Includes current maturities and capital lease obligation.
 
                                       26
<PAGE>
             UNAUDITED CONSOLIDATED PRO FORMA FINANCIAL STATEMENTS
 
    The following Unaudited Consolidated Pro Forma Financial Statements are
based on the historical financial statements of the Company. The pro forma
balance sheet is presented giving effect to (i) the Senior Credit Facilities
Refinancing, (ii) the Azerty Acquisition, (iii) the Notes Offering (including
the application of net proceeds to the Company therefrom), and (iv) the Offering
(including the application of net proceeds to the Company therefrom), all as
more fully described in the notes to Unaudited Consolidated Pro Forma Financial
Statements below, as if all such transactions were effected on March 31, 1998.
The pro forma income statement gives effect to (i) the Senior Credit Facilities
Refinancing, (ii) the Azerty Acquisition, (iii) the Notes Offering (including
the application of net proceeds to the Company therefrom) and (iv) the Offering
(including the application of net proceeds to the Company therefrom), all as
more fully described in the notes to Unaudited Consolidated Pro Forma Financial
Statements below, as if all such transactions were effected as of January 1,
1997. The supplemental pro forma balance sheet is presented giving effect to (i)
the Senior Credit Facilities Refinancing, (ii) the Azerty Acquisition, (iii) the
Notes Offering (including the application of net proceeds to the Company
therefrom), (iv) the Offering (including the application of net proceeds to the
Company therefrom) and (v) the Computer Services Contract Write-off, as if all
such transactions occurred on March 31, 1998. The 1997 supplemental pro forma
income statement is presented giving effect to (i) the October Equity Offering
(including the application of net proceeds to the Company therefrom), (ii) the
Preferred Stock Redemption, (iii) the Management Agreements Termination,
(collectively the "Financing Transactions") (iv) the Computer Services Contract
Write-Off, (v) the Senior Credit Facilities Refinancing, (vi) the Azerty
Acquisition, (vii) the Notes Offering (including the application of net proceeds
to the Company therefrom) and (viii) the Offering (including the application of
net proceeds to the Company therefrom), as if all such transactions occurred on
January 1, 1997. The supplemental pro forma income statement for the three
months ended March 31, 1998 is presented giving effect to (i) the Computer
Services Contract Write-Off, (ii) the Senior Credit Facilities Refinancing,
(iii) the Azerty Acquisition, (iv) the Notes Offering (including the application
of net proceeds to the Company therefrom) and (v) the Offering (including the
application of net proceeds to the Company therefrom), as if all such
transactions occurred on January 1, 1997.
 
    The pro forma income statements exclude the extraordinary non-recurring
charge of approximately $9.3 million ($5.5 million net of tax benefit of $3.8
million) related to the write-off of unamortized financing fees in conjunction
with the Senior Credit Facilities Refinancing. For pro forma balance sheet
purposes, this extraordinary non-recurring charge has been reflected as a
reduction of retained earnings.
 
    In addition to the above described extraordinary non-recurring charge of
$9.3 million, the 1997 Unaudited Consolidated Supplemental Pro Forma Income
Statement also excludes the following: (i) an extraordinary non-recurring charge
of $9.8 million ($5.9 million net of tax benefit of $3.9 million) on early
retirement of debt, (ii) a non-recurring non-cash charge of $59.4 million ($35.5
million net of tax benefit of $23.9 million) related to the vesting of the
Merger Incentive Options, and (iii) a non-recurring cash charge of $5.3 million
($3.2 million net of tax benefit of $2.1 million) related to the Management
Agreements Termination, all of which are related to the 1997 Financing
Transactions. These additional non-recurring charges are reflected in the
historical balance sheet as of March 31, 1998.
 
    The supplemental pro forma income statements also exclude the non-recurring
charge of approximately $13.9 million ($8.3 million net of tax benefit of $5.6
million) related to the Computer Servcies Contract Write-Off. For supplemental
pro forma balance sheet purposes, this non-recurring charge has been reflected
as a reduction of retained earnings.
 
    The Unaudited Consolidated Pro Forma Financial Statements are intended for
informational purposes only and are not necessarily indicative of the future
financial position or future results of operations of the Company after the
Senior Credit Facilities Refinancing, the Azerty Acquisition, the Notes Offering
and the Offering, or of the financial position or results of operations of the
Company that would have actually occurred had the Computer Services Contract
Write-Off, the 1997 Financing Transactions, the Senior Credit Facilities
Refinancing, the Azerty Acquisition, the Notes Offering or the Offering occurred
January 1, 1997. The Unaudited Consolidated Pro Forma Financial Statements and
the accompanying notes should be read in conjunction with, and are qualified in
their entirety by, the Consolidated Financial Statements of the Company,
together with the related notes thereto, included elsewhere herein.
 
                                       27
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        UNAUDITED CONSOLIDATED PRO FORMA
                   AND SUPPLEMENTAL PRO FORMA BALANCE SHEETS
                              AS OF MARCH 31, 1998
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                          COMPUTER
                                   SENIOR CREDIT                                                          SERVICES
                                    FACILITIES       AZERTY         NOTES                                 CONTRACT
                                    REFINANCING    ACQUISITION    OFFERING      OFFERING                  WRITE-OFF    SUPPLEMENTAL
                       HISTORICAL   ADJUSTMENTS    ADJUSTMENTS   ADJUSTMENTS   ADJUSTMENTS   PRO FORMA   ADJUSTMENTS    PRO FORMA
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
<S>                    <C>         <C>             <C>           <C>           <C>           <C>         <C>           <C>
ASSETS
Current assets:
  Cash and cash
    equivalents......  $   11,504    $      --      $     --      $      --     $      --    $  11,504   $       --     $   11,504
  Accounts
    receivable.......     282,237     (150,435)(a)    48,610(e)          --            --      180,412           --        180,412
  Inventories........     484,911           --        33,477(e)          --            --      518,388           --        518,388
  Other..............      15,754           --           488(e)          --            --       16,242       (2,639)(h)      13,603
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total current
      assets.........     794,406     (150,435)       82,575             --            --      726,546       (2,639)       723,907
Net property, plant
  and equipment......     161,894           --         5,847(e)          --            --      167,741           --        167,741
Goodwill.............     111,110           --        72,129(e)          --            --      183,239           --        183,239
Other................      20,282       (6,944)(b)        --          2,800(f)       (307)(g)    15,831          --         15,831
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total assets.....  $1,087,692    $(157,379)     $160,551      $   2,800     $    (307)   $1,093,357  $   (2,639)    $1,090,718
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
LIABILITIES AND
  STOCKHOLDERS'
  EQUITY
Current liabilities:
  Current portion of
    long-term debt...  $   19,551    $  (9,004)(c)  $    102(e)   $      --     $      --    $  10,649   $       --     $   10,649
  Accounts payable...     235,915           --        40,288(e)          --            --      276,203           --        276,203
  Accrued expenses...     107,616       (3,931)(d)     4,704(e)         (80)(f)      4,011(g)   112,320       2,599(h)     114,919
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total current
      liabilities....     363,082      (12,935)       45,094            (80)        4,011      399,172        2,599        401,771
Deferred income
  taxes..............      19,208           --            --             --            --       19,208       (5,589)(h)      13,619
Long-term
  obligations:
  Long-term debt.....     455,650     (138,596)(c)   115,457(e)       3,000(f)    (83,491)(g)   352,020          --        352,020
  Other long-term
    liabilities......      13,123           --            --             --            --       13,123        8,665(h)      21,788
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total long term
      obligations....     468,773     (138,596)      115,457          3,000       (83,491)     365,143        8,665        373,808
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
Stockholders' equity:
  Common stock
    (voting).........       1,602           --            --             --           191(g)     1,793           --          1,793
  Capital in excess
    of par value.....     211,261           --            --             --        79,166(g)   290,427           --        290,427
  Retained
    earnings.........      23,766       (5,848)(d)        --           (120)(f)       (184)(g)    17,614     (8,314)(h)       9,300
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total
      stockholders'
      equity.........     236,629       (5,848)           --           (120)       79,173      309,834       (8,314)       301,520
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
    Total liabilities
      and
      stockholders'
      equity.........  $1,087,692    $(157,379)     $160,551      $   2,800     $    (307)   $1,093,357  $   (2,639)    $1,090,718
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
                       ----------  -------------   -----------   -----------   -----------   ----------  -----------   ------------
</TABLE>
 
See accompanying Notes to Unaudited Consolidated Pro Forma Financial Statements.
 
                                       28
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        UNAUDITED CONSOLIDATED PRO FORMA
                  AND SUPPLEMENTAL PRO FORMA INCOME STATEMENTS
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                                                  SENIOR CREDIT
                                                   FACILITIES       AZERTY          NOTES
                                                   REFINANCING    ACQUISITION     OFFERING       OFFERING
                                       HISTORICAL  ADJUSTMENTS    ADJUSTMENTS    ADJUSTMENTS    ADJUSTMENTS    PRO FORMA
                                       ---------  -------------  -------------  -------------  -------------  -----------
<S>                                    <C>        <C>            <C>            <C>            <C>            <C>
INCOME STATEMENT DATA:
  Net sales..........................  $2,558,135  $      --      $ 355,423(l)   $      --       $      --     $2,913,558
  Cost of goods sold.................  2,112,204          --        323,160             --              --     2,435,364
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Gross profit.......................    445,931          --         32,263(l)          --              --       478,194
  Operating expense:
  Warehousing, marketing and
    administrative expenses..........    311,002          --         22,599(m)          --              --       333,601
  Non-recurring charges..............     64,698          --             --             --              --        64,698
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Total operating expenses...........    375,700          --         22,599             --              --       398,299
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Income from operations.............     70,231          --          9,664             --              --        79,895
  Interest expenses..................     53,511     (15,872)(i)      8,775(n)       1,230(o)       (5,988)(p)     41,656
  Other expense......................         --       9,251(j)          --             --              --         9,251
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Income before income taxes and
    extraordinary item...............     16,720       6,621            889         (1,230)          5,988        28,988
  Income taxes.......................      8,532       2,661(k)       1,055(k)        (494)(k)       2,407(k)     14,161
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Income before extraordinary item...      8,188       3,960           (166)          (736)          3,581        14,827
  Extraordinary item--loss on early
    retirement of debt, net of tax
    benefit of $3,956................     (5,884)         --             --             --              --        (5,884)
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Net income.........................      2,304       3,960           (166)          (736)          3,581         8,943
  Preferred stock dividends issued
    and accrued......................      1,528          --             --             --              --         1,528
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Net income attributable to common
    stockholders.....................  $     776   $   3,960      $    (166)     $    (736)      $   3,581     $   7,415
                                       ---------  -------------  -------------  -------------  -------------  -----------
                                       ---------  -------------  -------------  -------------  -------------  -----------
  Net income per common share--basic:
    Income before extraordinary
      item...........................  $    0.51                                                               $    0.89
    Extraordinary item...............      (0.45)                                                                  (0.39)
                                       ---------                                                              -----------
    Net income.......................  $    0.06                                                               $    0.50
                                       ---------                                                              -----------
                                       ---------                                                              -----------
    Weighted average shares (in
      thousands).....................     13,064                                                                  14,969
  Net income per common share--
    assuming dilution:
    Income before extraordinary
      item...........................  $    0.43                                                                    0.79
    Extraordinary item...............      (0.38)                                                                  (0.35)
                                       ---------                                                              -----------
    Net income.......................  $    0.05                                                               $    0.44
                                       ---------                                                              -----------
                                       ---------                                                              -----------
    Weighted average shares and
      assumed conversions (in
      thousands).....................     15,380                                                                  16,950
OTHER DATA:
  EBITDA.............................  $  96,272                                                               $ 108,903
  EBITDA margin......................        3.8%                                                                    3.7%
 
OTHER DATA BEFORE CHARGES:
  Income from operations.............  $ 134,929                                                               $ 144,593
  Net income attributable to common
    stockholders.....................     45,364                                                                  51,988
  Net income per common share
    assuming dilution................       2.95                                                                    3.07
  EBITDA.............................    160,970                                                                 173,601
  EBITDA margin......................        6.3%                                                                    6.0%
 
<CAPTION>
                                          COMPUTER
                                          SERVICES          1997
                                          CONTRACT        FINANCING
                                          WRITE-OFF     TRANSACTIONS   SUPPLEMENTAL
                                         ADJUSTMENTS     ADJUSTMENTS    PRO FORMA
                                       ---------------  -------------  ------------
<S>                                    <C>              <C>            <C>
INCOME STATEMENT DATA:
  Net sales..........................     $      --      $      --      $2,913,558
  Cost of goods sold.................            --             --       2,435,364
                                            -------     -------------  ------------
  Gross profit.......................            --             --         478,194
  Operating expense:
  Warehousing, marketing and
    administrative expenses..........        (3,240)(q)       (708)(r)     329,653
  Non-recurring charges..............            --        (64,698)(r)          --
                                            -------     -------------  ------------
  Total operating expenses...........        (3,240)       (65,406)        329,653
                                            -------     -------------  ------------
  Income from operations.............         3,240         65,406         148,541
  Interest expenses..................            --         (5,096)(s)      36,560
  Other expense......................            --             --           9,251
                                            -------     -------------  ------------
  Income before income taxes and
    extraordinary item...............         3,240         70,502         102,730
  Income taxes.......................         1,302(k)      28,342(k)       43,805
                                            -------     -------------  ------------
  Income before extraordinary item...         1,938         42,160          58,925
  Extraordinary item--loss on early
    retirement of debt, net of tax
    benefit of $3,956................            --          5,884(t)           --
                                            -------     -------------  ------------
  Net income.........................         1,938         48,044          58,925
  Preferred stock dividends issued
    and accrued......................            --         (1,528)(u)          --
                                            -------     -------------  ------------
  Net income attributable to common
    stockholders.....................     $   1,938      $  49,572      $   58,925
                                            -------     -------------  ------------
                                            -------     -------------  ------------
  Net income per common share--basic:
    Income before extraordinary
      item...........................                                   $     3.57
    Extraordinary item...............                                       --
                                                                       ------------
    Net income.......................                                   $     3.57
                                                                       ------------
                                                                       ------------
    Weighted average shares (in
      thousands).....................                                       16,519
  Net income per common share--
    assuming dilution:
    Income before extraordinary
      item...........................                                   $     3.19
    Extraordinary item...............                                       --
                                                                       ------------
    Net income.......................                                   $     3.19
                                                                       ------------
                                                                       ------------
    Weighted average shares and
      assumed conversions (in
      thousands).....................                                       18,500
OTHER DATA:
  EBITDA.............................                                   $  177,549
  EBITDA margin......................                                          6.1%
OTHER DATA BEFORE CHARGES:
  Income from operations.............                                   $  148,541
  Net income attributable to common
    stockholders.....................                                       58,925
  Net income per common share
    assuming dilution................                                         3.19
  EBITDA.............................                                      177,549
  EBITDA margin......................                                          6.1%
</TABLE>
 
See accompanying Notes to Unaudited Consolidated Pro Forma Financial Statements.
 
                                       29
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        UNAUDITED CONSOLIDATED PRO FORMA
                  AND SUPPLEMENTAL PRO FORMA INCOME STATEMENTS
                   FOR THE THREE MONTHS ENDED MARCH 31, 1998
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                                                           SENIOR CREDIT
                                                            FACILITIES       AZERTY         NOTES
                                                            REFINANCING    ACQUISITION    OFFERING      OFFERING
                                               HISTORICAL   ADJUSTMENTS    ADJUSTMENTS   ADJUSTMENTS   ADJUSTMENTS   PRO FORMA
                                               ----------  -------------   -----------   -----------   -----------   ----------
<S>                                            <C>         <C>             <C>           <C>           <C>           <C>
INCOME STATEMENT DATA:
  Net sales..................................  $  712,517    $     --       $ 99,723(l)    $   --        $    --     $  812,240
  Cost of goods sold.........................     589,455          --         91,050           --             --        680,505
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Gross profit...............................     123,062          --          8,673(l)        --             --        131,735
  Operating expense:
  Warehousing, marketing and administrative        85,037
    expenses.................................                      --          6,275(m)        --             --         91,312
  Non-recurring charges......................          --          --             --           --             --             --
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Total operating expenses...................      85,037          --          6,275           --             --         91,312
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Income from operations.....................      38,025          --          2,398           --             --         40,423
  Interest expense...........................      11,826      (3,700)(i)      2,218(n)       287(o)      (1,497)(p)      9,134
  Other expense..............................          --       2,313             --           --             --          2,313
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Income before income taxes and                   26,199
    extraordinary item.......................                   1,387            180         (287)         1,497         28,976
  Income taxes...............................      11,108         558(k)         250(k)      (115)(k)        602(k)      12,403
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Income before extra item...................      15,091         829            (70)        (172)           895         16,573
  Extraordinary item.........................          --          --             --           --             --             --
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Net income.................................      15,091         829            (70)        (172)           895         16,573
  Preferred dividends........................          --          --             --           --             --             --
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Net income attributable to common            $   15,091
    stockholders.............................                $    829       $    (70)      $ (172)       $   895     $   16,573
                                               ----------  -------------   -----------   -----------   -----------   ----------
                                               ----------  -------------   -----------   -----------   -----------   ----------
  Net income per common share-- basic........  $     0.94                                                            $     0.93
                                               ----------                                                            ----------
                                               ----------                                                            ----------
  Weighted average shares (in thousands).....      15,995                                                                17,900
 
  Net income per common share-- assuming       $     0.88
    dilution.................................                                                                        $     0.89
                                               ----------                                                            ----------
                                               ----------                                                            ----------
  Weighted average shares and assumed              17,098
    conversions (in thousands)...............                                                                            18,646
 
<CAPTION>
                                                 COMPUTER
                                                 SERVICES
                                                 CONTRACT
                                                WRITE-OFF     SUPPLEMENTAL
                                               ADJUSTMENTS     PRO FORMA
                                               ------------   ------------
<S>                                            <C>            <C>
INCOME STATEMENT DATA:
  Net sales..................................    $    --       $  812,240
  Cost of goods sold.........................         --          680,505
                                               ------------   ------------
  Gross profit...............................         --          131,735
  Operating expense:
  Warehousing, marketing and administrative
    expenses.................................       (802)(q)       90,510
  Non-recurring charges......................         --               --
                                               ------------   ------------
  Total operating expenses...................       (802)          90,510
                                               ------------   ------------
  Income from operations.....................        802           41,225
  Interest expense...........................         --            9,134
  Other expense..............................         --            2,313
                                               ------------   ------------
  Income before income taxes and
    extraordinary item.......................        802           29,778
  Income taxes...............................        322(k)        12,725
                                               ------------   ------------
  Income before extra item...................        480           17,053
  Extraordinary item.........................         --               --
                                               ------------   ------------
  Net income.................................        480           17,053
  Preferred dividends........................         --               --
                                               ------------   ------------
  Net income attributable to common
    stockholders.............................    $   480       $   17,053
                                               ------------   ------------
                                               ------------   ------------
  Net income per common share-- basic........                  $     0.95
                                                              ------------
                                                              ------------
  Weighted average shares (in thousands).....                      17,900
  Net income per common share-- assuming
    dilution.................................                  $     0.91
                                                              ------------
                                                              ------------
  Weighted average shares and assumed
    conversions (in thousands)...............                      18,646
</TABLE>
 
See accompanying Notes to Unaudited Consolidated Pro Forma Financial Statements.
 
                                       30
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                         PRO FORMA FINANCIAL STATEMENTS
                             (DOLLARS IN THOUSANDS)
 
The pro forma financial statements have been prepared giving effect to the
following:
 
(1) The offering price for the shares of Common Stock is assumed to be $54.00
    per share.
 
(2) The New Credit Facilities and Receivables Securitization Program replaced
    all preexisting debt under the Existing Credit Agreement (which, as of
    December 31, 1997 and March 31, 1998, consisted of $148.8 million and $119.0
    million of term loan facilities and $256.0 million and $224.0 million in a
    revolving credit facility, respectively). Accordingly, $9.3 million of
    unamortized financing fees as of March 31, 1998 related to the credit
    agreement governing the Existing Credit Facilities ($5.6 million net of tax
    benefit of $3.7 million) were expensed as an extraordinary charge due to the
    early retirement of such debt. As this extraordinary charge will be
    non-recurring it is not considered for pro forma income statement purposes.
    Proceeds from the receivables sold under the Receivables Securitization
    Program will be used to reduce borrowings under the New Credit Facilities.
    The Company received approximately $160.0 million in proceeds from the sale
    of certain Eligible Receivables on April 3, 1998. These Unaudited
    Consolidated Pro Forma Financial Statements reflect $150.0 million in
    proceeds from the sale of certain Eligible Receivables under the Receivables
    Securitization Program as this amount was deemed to more fairly represent
    the average amount of receivables that would have been sold in 1997. The
    anticipated annual costs related to the sale of certain accounts receivable
    is estimated to be $9.3 million and is shown in other expense.
 
(3) The Tranche B Term Loan Facility ($100.0 million) and a portion of the
    Revolving Credit Facility under the New Credit Facilities ($15.2 million)
    were used to purchase the Azerty Business and pay approximately $1.0 million
    in acquisition fees and expenses.
 
(4) The total purchase price for the Azerty Business (including fees and
    expenses) was approximately $115.2 million and has been preliminarily
    allocated as follows:
 
<TABLE>
<S>                                                                 <C>
Current assets....................................................  $  82,575
Property, plant and equipment.....................................      5,847
Goodwill..........................................................     72,129
Liabilities assumed...............................................    (45,342)
                                                                    ---------
  Total purchase price............................................  $ 115,209
                                                                    ---------
                                                                    ---------
</TABLE>
 
                                       31
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
(5) The operating results for the year ended December 31, 1997 and for the three
    months ended March 31, 1998 for the Azerty Business have been included as
    follows:
 
<TABLE>
<CAPTION>
                                                                                    THREE
                                                                   YEAR ENDED   MONTHS ENDED
                                                                  DECEMBER 31,    MARCH 31,
                                                                      1997          1998
                                                                  ------------  -------------
<S>                                                               <C>           <C>
Net sales.......................................................   $  355,423     $  99,723
Cost of goods sold..............................................      323,160        91,050
                                                                  ------------  -------------
  Gross Profit..................................................       32,263         8,673
Warehousing, marketing and administrative expenses(a)(b)........       22,599         6,275
                                                                  ------------  -------------
Earnings before interest and taxes..............................   $    9,664     $   2,398
                                                                  ------------  -------------
                                                                  ------------  -------------
- ------------------------
</TABLE>
 
           (a) Includes $1.8 million of annual goodwill amortization based on
               $72.1 million of goodwill as computed above amortized over 40
               years.
 
           (b) Excludes special bonuses paid by Abitibi-Consolidated Inc.,
               amounting to approximately $3.5 million, to senior Azerty
               Business executives related to the Azerty Acquisition; such
               bonuses do not represent continuing obligations of the Azerty
               Business. Also excludes approximately $1.5 million of annual
               goodwill amortization related to the purchase cost paid by
               Abitibi-Consolidated, Inc. for the Azerty Business; such goodwill
               is eliminated under purchase accounting as applied to the Azerty
               Acquisition.
 
(6) Pro forma interest expense has been calculated based upon pro forma debt
    levels and the applicable interest rates. The Existing Credit Facilities'
    term loan facilities and revolving credit facility were assumed to bear
    interest at their respective current rates of 7.71% and 7.67%, respectively,
    for the year ended December 31, 1997 and 7.71% and 7.67%, respectively, for
    the three months ended March 31, 1998. The Revolving Credit Facility, the
    Tranche A Term Loan Facility and the Tranche B Term Loan Facility under the
    New Credit Facilities were assumed to bear interest at rates of 7.45%, 7.15%
    and 7.65%, respectively, for the year ended December 31, 1997 and 7.45%,
    7.15% and 7.65%, respectively, for the three months ended March 31, 1998,
    based on current LIBOR/prime rates and spread terms. A variation of 0.125%
    in effective interest rates used for pro forma purposes has a $0.5 million
    impact for the year ended December 31, 1997 and a $0.1 million impact for
    the three months ended March 31, 1998 on pro forma interest expense.
 
(7) Income taxes have been provided for all adjustments at an assumed rate of
    40.2%. Goodwill resulting from the Azerty Acquisition will not be tax
    deductible and as such is not tax affected.
 
                                       32
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
    The December 31, 1997 supplemental pro forma income statement reflecting the
1997 Financing Transactions and the Computer Services Contract Write-Off has
been prepared giving effect to all the assumptions made in the pro forma income
statement and the following:
 
(1) The Computer Services Contract Write-Off results in a $13.9 million
    non-recurring charge ($8.3 million net of tax benefit of $5.6 million) and
    $3.2 million in annual cost savings.
 
(2) The October Equity Offering and the resulting proceeds thereof were
    contributed to the Company and used to redeem $50.0 million of the Company's
    12 3/4% Notes, pay the redemption premium of $6.4 million thereon, and pay
    down $15.5 million of indebtedness under the Existing Credit Facilities. The
    resulting extraordinary loss of $9.8 million ($5.9 million net of tax
    benefit of $3.9 million) on early retirement of debt was eliminated for pro
    forma purposes.
 
(3) The October Equity Offering also resulted in the recognition of a pre-tax
    non-recurring non-cash charge of $59.4 million ($35.5 million net of tax
    benefit of $23.9 million) and a non-recurring cash charge of $5.3 million
    ($3.2 million net of tax benefit of $2.1 million) related to the vesting of
    the Merger Incentive Options and the Management Agreements Termination,
    respectively. These non-recurring charges have been eliminated for pro forma
    purposes. Approximately $0.7 million in management advisory service
    agreement fees were paid prior to the Management Agreements Termination.
    Accordingly, these fees which were charged to 1997 operating expenses have
    been eliminated for pro forma purposes.
 
(4) On September 2, 1997, United completed the redemption of all outstanding
    shares of its Series A and Series C Preferred Stock for an aggregate
    redemption price of approximately $21.3 million. Accordingly, the $1.5
    million of Preferred Stock dividends issued and accrued for the year ended
    December 31, 1997 has been eliminated for pro forma purposes.
 
    The supplemental pro forma income statement for the three months ended March
31, 1998 has been prepared giving effect to all assumptions made in the pro
forma income statement and the adjustment for the Computer Services Contract
Write-Off described above. Approximately $2.6 million in prepaid expense related
to the Computer Services Contract has been eliminated for supplemental pro forma
balance sheet purposes and $2.6 million and $8.7 million of current and
long-term payments have been added to current and long-term liabilities,
respectively, as a result of the Computer Services Contract Write-Off.
 
    Pro forma adjustments have been made to the pro forma and supplemental pro
forma balance sheets to reflect the following effects of the Senior Credit
Facilities Refinancing, the Azerty Acquisition, the Notes Offering, the
Offering, and the Computer Services Contract Write-off:
 
<TABLE>
<C>        <S>                                                                   <C>
      (a)  Reflects the sale of accounts receivable related to the Receivables
           Securitization Program.
 
      (b)  Write-off of capitalized financing costs associated with the          $  (9,344)
           retirement of the Existing Credit Facilities' revolving credit
           facility, tranche A and tranche B term loans........................
           Capitalize financing costs related to the New Credit Facilities.....      2,400
                                                                                 ---------
                                                                                 $  (6,944)
                                                                                 ---------
                                                                                 ---------
</TABLE>
 
                                       33
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
    (c) Reflects retirement of debt under the Existing Credit Facilities and the
       issuance of new debt under the New Credit Facilities:
 
<TABLE>
<S>                                                                <C>
Retirement of existing tranche A term loan.......................  $ (18,337)
Retirement of existing tranche B term loan.......................       (667)
Tranche A Term Loan Facility.....................................     10,000
                                                                   ---------
  Adjustment to current maturities of long-term debt(1)..........  $  (9,004)
                                                                   ---------
                                                                   ---------
Retirement of existing tranche A term loan.......................  $ (58,345)
Retirement of existing tranche B term loan.......................    (41,675)
Retirement of existing revolving credit facility.................   (224,000)
Tranche A Term Loan Facility.....................................    140,000
Revolving Credit Facility........................................     45,424
                                                                   ---------
  Adjustment to long-term debt(1)................................  $(138,596)
                                                                   ---------
                                                                   ---------
- ------------------------
</TABLE>
 
       (1) Totals $147.6 million and combined with the $2.4 million of financing
           costs related to the New Credit Facilities (see Note b) reflects the
           use of proceeds from the Receivables Securitization Program.
 
    (d) Adjustment to current income tax liability for the tax effect and to
       retained earnings for the net effect of the write-off of the capitalized
       financing costs and the initial costs related to the sale of certain
       accounts receivable.
 
    (e) Reflects the use of $100.0 million of the Tranche B Term Loan Facility
       and $15.2 million of the Revolving Credit Facility under the New Credit
       Facilities to purchase the Azerty Business. The Company has also assumed
       $0.3 million of debt from the Azerty Business. The assets and liabilities
       of the Azerty Business (including fees and expenses) are preliminarily
       allocated as follows:
 
<TABLE>
<S>                                                                 <C>
Current assets....................................................  $  82,575
Property, plant and equipment.....................................      5,847
Goodwill..........................................................     72,129
Liabilities assumed...............................................    (45,342)
                                                                    ---------
  Purchase price..................................................  $ 115,209
                                                                    ---------
                                                                    ---------
</TABLE>
 
    (f) Reflects net proceeds of $97.0 million from the Notes Offering ($100.0
       million net of approximately $3.0 million in financing costs) plus an
       additional $3.0 million in borrowings under the Revolving Credit Facility
       used to pay down the indebtedness outstanding under the Tranche B Term
       Loan Facility, and as a result $0.2 million ($0.12 million net of tax
       benefit of $0.08 million) in financing fees associated with the Tranche B
       Term Loan Facility was expensed as an extraordinary loss due to the early
       retirement of debt (which loss is excluded for pro forma income statement
       purposes as it is non-recurring).
 
                                       34
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
    (g) The pro forma adjustments related to the Offering consist of the
       following:
 
<TABLE>
<S>                                                                <C>
Adjustment to other assets:
  Write-off of capitalized financing costs associated with the
    reduction of the Tranche A Term Loan Facility................  $    (307)
                                                                   ---------
                                                                   ---------
Adjustments to accrued expenses:
  Tax benefit related to options exercised.......................  $  (3,235)
  Tax benefit related to write-off of capitalized financing costs
    associated with the reduction of the Tranche A Term Loan
    Facility.....................................................       (123)
  Employee withholding tax liability associated with options
    exercised....................................................      7,369
                                                                   ---------
Increase in accrued expenses.....................................  $   4,011
                                                                   ---------
                                                                   ---------
Adjustments to long-term obligations:
  Proceeds from the exercise of stock options....................  $  (6,408)
  Proceeds from the issuance of Common Stock by the Company in
    conjunction with the Offering (net of underwriting discounts
    and commissions and expenses)................................    (77,083)
                                                                   ---------
Decrease in long-term obligations................................  $ (83,491)
                                                                   ---------
                                                                   ---------
Adjustments to stockholders' equity:
  Common Stock:
    Issuance of shares of Common Stock by the Company in
      conjunction with the Offering..............................  $     150
    Issuance of shares of Common Stock by the Company in
      conjunction with the exercise of stock options.............         41
                                                                   ---------
    Increase in Common Stock.....................................  $     191
                                                                   ---------
                                                                   ---------
  Capital in excess of par value:
    Issuance of shares of Common Stock by the Company in
      conjunction with the Offering (net of underwriting
      discounts and commissions and expenses)....................  $  76,933
    Issuance of shares of Common Stock by the Company in
      conjunction with the exercise of stock options.............      2,233
                                                                   ---------
    Increase in capital in excess of par value...................  $  79,166
                                                                   ---------
                                                                   ---------
  Retained earnings:
    Write-off of capitalized financing costs associated with the
      reduction of the Tranche A Term Loan Facility, net of tax
      benefit....................................................       (184)
                                                                   ---------
                                                                   ---------
Increase in stockholders' equity.................................  $  79,173
                                                                   ---------
                                                                   ---------
</TABLE>
 
    (h) The supplemental pro forma adjustments for the Computer Services
       Contract Write-Off consist of the following:
 
       (1) Reduction in other current assets of $2,639 reflecting the write-off
           of the prepaid expense related to the Computer Services Contract
           Write-Off.
 
                                       35
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
       (2) Increase in accrued expenses of $2,599 reflecting the current portion
           of the remaining payments on the Computer Services Contract.
 
       (3) Reduction in deferred income taxes of $5,589 reflecting the future
           tax benefit of the Computer Services Contract Write-Off.
 
       (4) Increase in long-term liabilities of $8,665 reflecting the long-term
           portion of the remaining payments on the Computer Services Contract.
 
       (5) Reduction in retained earnings of $8,314 reflecting the after tax
           impact of the Computer Services Contract Write-Off.
 
    Pro forma adjustments have been made to the pro forma and supplemental pro
forma income statements to reflect the following effects of the Senior Credit
Facilities Refinancing, the Azerty Acquisition, the Notes Offering, the
Offering, the Computer Services Contract Write-Off and the 1997 Financing
Transactions:
 
    (i) The pro forma adjustments to interest expense related to the Senior
       Credit Facilities Refinancing consist of the following:
 
<TABLE>
<CAPTION>
                                                                                         THREE
                                                                        YEAR ENDED   MONTHS ENDED
                                                                       DECEMBER 31,    MARCH 31,
                                                                           1997          1998
                                                                       ------------  -------------
<S>                                                                    <C>           <C>
Elimination of interest related to Existing Credit Facilities:
  Revolving credit facility..........................................   $  (12,540)    $  (3,896)
  Tranche A term loan................................................       (9,412)       (1,812)
  Tranche B term loan................................................       (4,794)       (1,048)
  Elimination of amortization of deferred financing costs on retired
    debt.............................................................       (3,027)         (717)
                                                                       ------------  -------------
Decrease in interest expense.........................................      (29,773)       (7,473)
                                                                       ------------  -------------
Interest on new indebtedness (New Credit Facilities):
  Revolving Credit Facility..........................................        3,133           954
  Tranche A Term Loan Facility.......................................       10,368         2,719
  Amortization of deferred financing costs on the New Credit
    Facilities(1)....................................................          400           100
                                                                       ------------  -------------
  Increase in interest expense.......................................       13,901         3,773
                                                                       ------------  -------------
Net decrease in interest expense.....................................   $  (15,872)    $  (3,700)
                                                                       ------------  -------------
                                                                       ------------  -------------
- ------------------------
</TABLE>
 
           (1) Debt issuance costs are amortized over the life of the related
              new debt, 6 years.
 
    (j) Reflects the costs related to the sale of certain accounts receivable
       under the Receivables Securitization Program.
 
    (k) Income taxes have been provided for all adjustments at an assumed rate
       of 40.2%. Goodwill resulting from the Azerty Acquisition will not be tax
       deductible and as such is not tax affected.
 
    (l) Reflects the historical Azerty Business net sales and gross profit.
 
                                       36
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
    (m) Reflects the Azerty Business historical operating expenses for the year
       ended December 31, 1997, as adjusted (see page 32 note (5)), and the
       three months ended March 31, 1998 for the Azerty Business plus $1.8
       million and $0.4 million, respectively, of goodwill amortization related
       to the Azerty Acquisition.
 
    (n) The pro forma adjustments to interest expense related to the Azerty
       Acquisition consist of the following:
 
<TABLE>
<CAPTION>
                                                                                           THREE
                                                                        YEAR ENDED     MONTHS ENDED
                                                                       DECEMBER 31,      MARCH 31,
                                                                           1997            1998
                                                                       -------------  ---------------
<S>                                                                    <C>            <C>
Interest on new indebtedness (New Credit Facilities):
  Tranche B Term Loan Facility.......................................    $   7,650       $   1,938
  Revolving Credit Facility..........................................        1,125             280
                                                                            ------          ------
    Increase in interest expense.....................................    $   8,775       $   2,218
                                                                            ------          ------
                                                                            ------          ------
</TABLE>
 
    (o) The pro forma adjustments to interest expense related to the Notes
       Offering consist of the following:
 
<TABLE>
<CAPTION>
                                                                                         THREE
                                                                        YEAR ENDED   MONTHS ENDED
                                                                       DECEMBER 31,    MARCH 31,
                                                                           1997          1998
                                                                       ------------  -------------
<S>                                                                    <C>           <C>
Elimination of interest related to New Credit Facilities:
  Tranche B Term Loan Facility.......................................   $   (7,650)    $  (1,938)
                                                                       ------------  -------------
Interest on new indebtedness (New Credit Facilities and the 8 3/8%
  Notes):
  Revolving Credit Facility..........................................          205            56
  Notes Offering.....................................................        8,375         2,094
  Amortization of deferred financing costs on 8 3/8% Notes(1)........          300            75
                                                                       ------------  -------------
  Increase in interest expense.......................................        8,880         2,225
                                                                       ------------  -------------
    Net increase in interest expense.................................   $    1,230     $     287
                                                                       ------------  -------------
                                                                       ------------  -------------
- ------------------------
</TABLE>
 
           (1) Debt issuance costs are amortized over the life of the related
              new debt, 10 years.
 
                                       37
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                        NOTES TO UNAUDITED CONSOLIDATED
                 PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
                             (DOLLARS IN THOUSANDS)
 
    (p) The pro forma adjustments to interest expense related to the Offering
       consist of the following:
 
<TABLE>
<CAPTION>
                                                                                         THREE
                                                                        YEAR ENDED   MONTHS ENDED
                                                                       DECEMBER 31,    MARCH 31,
                                                                           1997          1998
                                                                       ------------  -------------
<S>                                                                    <C>           <C>
Elimination of interest expense related to the reduction of Tranche A
  Term Loan Facility with the proceeds from the Offering.............   $   (5,511)    $  (1,378)
Elimination of interest expense related to the reduction of the
  Revolving Credit Facility with the proceeds realized from the
  exercise of stock options..........................................         (477)         (119)
                                                                       ------------  -------------
Net decrease in interest expense.....................................   $   (5,988)    $  (1,497)
                                                                       ------------  -------------
                                                                       ------------  -------------
</TABLE>
 
    Additional pro forma adjustments have been made in the supplemental pro
forma income statement to give effect to the following:
 
    (q) Reflects the cost savings associated with the Computer Services Contract
       Write-Off.
 
    (r) In the fourth quarter of 1997, United recognized a non-recurring
       non-cash charge of $59.4 million ($35.5 million net of tax benefit of
       $23.9 million) and a non-recurring cash charge of $5.3 million ($3.2
       million net of tax benefit of $2.1 million) related to the vesting of the
       Merger Incentive Options and the Management Agreements Termination,
       respectively. In addition, approximately $0.7 million in management
       advisory service fees were paid in 1997 prior to the Management
       Agreements Termination. These charges and expenses are excluded for pro
       forma income statement purposes as they are non-recurring.
 
    (s) The pro forma adjustments to interest expense related to the 1997
       Financing Transactions consist of the following:
 
<TABLE>
<CAPTION>
                                                                                   YEAR ENDED
                                                                                  DECEMBER 31,
                                                                                      1997
                                                                                  ------------
<S>                                                                               <C>
Addition (Elimination) of interest related to:
  Existing Credit Facilities....................................................   $      701
  12 3/4% Notes.................................................................       (5,467)
  Elimination of amortization of deferred financing costs on retired debt.......         (330)
                                                                                  ------------
Decrease in interest expense....................................................   $   (5,096)
                                                                                  ------------
                                                                                  ------------
</TABLE>
 
    (t) In the fourth quarter of 1997, United recorded an extraordinary loss of
       $9.8 million ($5.9 million net of tax benefit of $3.9 million) related to
       early retirement of debt. This non-recurring charge is excluded for pro
       forma purposes.
 
    (u) On September 2, 1997, United completed the redemption of all outstanding
       shares of its Series A and Series C Preferred Stock for an aggregate
       redemption price of approximately $21.3 million. Accordingly, no
       Preferred Stock dividends would be paid or accrued on a pro forma basis.
 
                                       38
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    The following discussion should be read in conjunction with the Consolidated
Financial Statements of the Company and related notes appearing elsewhere in
this Prospectus.
 
    Certain information set forth in this discussion includes forward-looking
statements regarding the Company's future results of operations. The Company is
confident that its expectations are based on reasonable assumptions given its
knowledge of its operations and business. However, there can be no assurance
that the Company's actual results will not differ materially from its
expectations. The matters referred to in forward-looking statements may be
affected by the risks and uncertainties involved in the Company's business
including, among others, competition with business products manufacturers and
other wholesalers, consolidation of the business products industry, the ability
to maintain gross profit margins, the ability to reduce operating expenses as a
percent of net sales, changing end-user demands, changes in manufacturers'
pricing, service interruptions and availability of liquidity and capital
resources.
 
OVERVIEW
 
    On October 10, 1997, the Company completed the October Equity Offering. The
shares of Common Stock sold by the Company in the October Equity Offering were
priced at $38.00 per share, before underwriting discounts and a commission of
$1.90 per share. The aggregate net proceeds from this October Equity Offering of
$72.2 million (before deducting expenses) and proceeds of $0.1 million resulting
from the conversion of 1,119,038 warrants into Common Stock were contributed to
USSC and used to (i) redeem $50.0 million of 12 3/4% Notes and pay the
redemption premium thereon of $6.4 million, (ii) pay fees related to the October
Equity Offering, and (iii) reduce the indebtedness under the Existing Credit
Facilities' term loan facilities by $15.5 million. The repayment of indebtedness
resulted in an extraordinary loss of $9.8 million ($5.9 million net of tax
benefit of $3.9 million) and caused a permanent reduction of the amount
borrowable under the Existing Credit Facilities.
 
    On March 30, 1995, Associated merged with and into United. Although United
was the surviving corporation in the Merger, the transaction was treated as a
reverse acquisition for accounting purposes, with Associated as the acquiring
corporation. Therefore, the results of operations for the year ended December
31, 1995 reflect the financial information of Associated only for the three
months ended March 30, 1995 and the results of the Company for the nine months
ended December 31, 1995. As a result of the Merger, the results of operations of
the Company for the year ended December 31, 1995 are not comparable to those of
previous and subsequent periods.
 
    To facilitate a meaningful comparison of the years ended December 31, 1996
and 1995, a supplemental discussion and analysis is included and based on the
supplemental pro forma results of operations for the Company for the year ended
December 31, 1995. The supplemental pro forma results of operations do not
purport to be indicative of the results that would have been obtained had such
transactions been completed for the periods presented or that may be obtained in
the future.
 
GENERAL INFORMATION
 
    EMPLOYEE STOCK OPTIONS.  The Company's Management Equity Plan allows the
Board of Directors of the Company to designate, and the directors have
designated the Performance Incentive Compensation Committee as the option
committee to administer the Management Equity Plan. The Management Equity Plan
provides for the issuance of options to purchase shares of Common Stock to key
officers and management employees of the Company, either as incentive stock
options or as non-qualified stock options.
 
    Effective November 1997, the Company's stockholders approved an amendment to
the Management Equity Plan which provided for the issuance of approximately 1.5
million additional options to key
 
                                       39
<PAGE>
management employees and directors of the Company. During 1997, approximately
0.3 million options were granted to management employees and directors at fair
market value. In 1998 to date, the Company has granted 464,575 options to
management employees and directors at fair market value.
 
    In September 1995, the Company's Board of Directors approved an amendment to
the Management Equity Plan which provided for the issuance of Merger Incentive
Options to key management employees of the Company exercisable for up to 2.2
million additional shares of its Common Stock. Subsequently, approximately 2.2
million options were granted during 1995 and 1996 to management employees. Some
of the options were granted at an option price below market value and the option
price of certain options increased by $0.625 on a quarterly basis from April 1,
1996 through October 1, 1997.
 
    These Merger Incentive Options were granted in order to provide incentives
to management with respect to the successful development of ASI and the
integration of ASI with the Company. All Merger Incentive Options were vested
and became exercisable with the completion of the October Equity Offering in
October 1997. All Common Stock issued upon the exercise of Merger Incentive
Options is subject to a six month holding period which expired on April 10,
1998. In the fourth quarter of 1997, the Company was required to recognize
compensation expense based upon the difference between the fair market value of
the Common Stock and the exercise prices of Merger Incentive Options. Based on
the closing stock price on October 10, 1997 of $39.125 and options outstanding
as of October 10, 1997, the Company recognized a non-recurring non-cash charge
of $59.4 million ($35.5 million net of tax benefit of $23.9 million).
 
    RESTRUCTURING CHARGE.  The historical results for the twelve months ended
December 31, 1995 include a restructuring charge of $9.8 million ($5.9 million
net of tax benefit of $3.9 million). The restructuring charge included severance
costs totaling $1.8 million. The Company's Merger consolidation plan specified
that 330 distribution, sales and corporate positions, 180 of which related to
pre-Merger Associated, were to be eliminated substantially within one year
following the Merger. The Company achieved its target, with the related
termination costs of approximately $1.8 million charged against the reserve. The
restructuring charge also included distribution center closing costs totaling
$6.7 million and stockkeeping unit reduction costs totaling $1.3 million. The
consolidation plan called for the closing of eight redundant distribution
centers, six of which related to pre-Merger Associated, and the elimination of
overlapping inventory items from the Company's catalogs substantially within the
one-year period following the Merger. Estimated distribution center closing
costs included (i) the net occupancy costs of leased facilities after they are
vacated until expiration of leases and (ii) the losses on the sale of owned
facilities and the facilities' furniture, fixtures and equipment. Estimated
stockkeeping unit reduction costs included losses on the sale of inventory items
which have been discontinued solely as a result of the Merger. As of December
31, 1997, five of the six redundant pre-Merger Associated distribution centers
had been closed with $5.5 million charged against the reserve and $2.0 million
related to stockkeeping unit reduction costs had also been charged against the
reserve. As of December 31, 1997, the Company's consolidation plan had been
substantially completed. Seven of the eight redundant distribution centers had
been closed. Management believes the restructuring reserve balance at December
31, 1997 of $0.3 million is adequate to cover the remaining estimated
expenditures related to Merger integration and transition costs. See Note 5 to
the Consolidated Financial Statements of the Company included elsewhere herein.
 
ACTUAL AND SUPPLEMENTAL PRO FORMA RESULTS OF OPERATIONS
 
    The following table of summary actual and supplemental pro forma results of
operations (see Note 5 to the Consolidated Financial Statements of the Company
included elsewhere herein) is intended for informational purposes only and is
not necessarily indicative of either financial position or results of operations
in the future, or that would have occurred had the events described in the
second paragraph
 
                                       40
<PAGE>
under "--Overview" occurred on January 1, 1995. The following information should
be read in conjunction with, and is qualified in its entirety by, the historical
Consolidated Financial Statements of the Company, including the related notes
thereto, included elsewhere herein.
<TABLE>
<CAPTION>
                                                 YEARS ENDED DECEMBER 31,                       THREE MONTHS ENDED MARCH 31,
                             ----------------------------------------------------------------  -------------------------------
                                 SUPPLEMENTAL
                                  PRO FORMA
                                     1995                  1996                  1997                  1997            1998
                             --------------------  --------------------  --------------------  --------------------  ---------
                                                                  (DOLLARS IN THOUSANDS)
<S>                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Net sales..................  $2,201,860     100.0% $2,298,170     100.0% $2,558,135     100.0% $ 635,021      100.0% $ 712,517
Gross profit...............    381,270       17.3    390,961       17.0    445,931       17.4    108,742       17.1    123,062
Operating expenses.........    299,861       13.6    277,957       12.1    311,002       12.2     76,704       12.1     85,037
Non-recurring charges......         --         --         --         --     64,698        2.5     --         --         --
                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income from operations.....  $  81,409        3.7% $ 113,004        4.9% $  70,231        2.7% $  32,038        5.0% $  38,025
                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
<S>                          <C>
Net sales..................      100.0%
Gross profit...............       17.2
Operating expenses.........       11.9
Non-recurring charges......     --
                             ---------
Income from operations.....        5.3%
                             ---------
                             ---------
</TABLE>
 
COMPARISON OF ACTUAL RESULTS FOR THE THREE MONTHS ENDED MARCH 31, 1998 AND 1997
 
    NET SALES.  Net sales were $712.5 million in the first quarter of 1998, a
12.2% increase over net sales of $635.0 million in the first quarter of 1997.
However, the first quarter of 1998 benefited from the timing of the Easter
holiday that occurred in the first quarter of 1997. Excluding this effect, sales
would have increased approximately 11%. The Company experienced sales strength
in all geographic regions and across all product categories.
 
    GROSS PROFIT.  Gross profit as a percent of net sales of 17.2% in the first
quarter of 1998 was up from 17.1% in the comparable period of 1997.
 
    OPERATING EXPENSES.  Operating expenses as a percent of net sales decreased
to 11.9% in the first quarter of 1998 from 12.1% in the first quarter of 1997.
The reduction in operating expenses as a percent of net sales is primarily due
to the leveraging of fixed expenses on a higher sales base.
 
    INCOME FROM OPERATIONS.  Income from operations as a percent of net sales
increased to 5.3% in the first quarter of 1998 from 5.0% in the first quarter of
1997.
 
    INTEREST EXPENSE.  Interest expense as a percent of net sales was 1.7% in
the first quarter of 1998, compared with 2.3% in the comparable period in 1997.
In addition to the impact of leveraging such expense against a higher sales
base, this reduction also reflects the prepayment of $50.0 million of the
12 3/4% Notes and $15.5 million of term loans during the fourth quarter of 1997
with a portion of the proceeds from the October Equity Offering.
 
    INCOME BEFORE INCOME TAXES AND EXTRAORDINARY ITEM.  Income before income
taxes as a percent of net sales was 3.6% in the first quarter of 1998, compared
with 2.7% in the first quarter of 1997.
 
    NET INCOME.  Net income before preferred stock dividends was $15.1 million
in the first quarter of 1998, compared with $10.0 million in the first quarter
of 1997.
 
COMPARISON OF ACTUAL RESULTS FOR THE YEARS ENDED DECEMBER 31, 1997 AND 1996
 
    NET SALES.  Net sales increased 11.8%, on equivalent workdays, to $2.6
billion for 1997 compared with $2.3 billion for 1996. This increase represents
strength in all geographic regions. Also, the Company's janitorial and
sanitation products, office furniture and traditional office supplies
experienced strong growth throughout the year.
 
    Net sales for 1997 include ten months of incremental sales related to the
October 1996 acquisition of Lagasse. Excluding the Lagasse acquisition, sales
growth for 1997 was 8.8%.
 
                                       41
<PAGE>
    GROSS PROFIT.  Gross profit as a percent of net sales increased to 17.4% in
1997 from 17.0% in 1996. This increase reflects higher vendor rebates obtained
by meeting higher purchase volume hurdles. In addition, the Company continued to
see a shift in product mix toward higher margin items. Lower margin computer
hardware declined as a percent of total sales.
 
    OPERATING EXPENSES.  Operating expenses as a percent of net sales, before
non-recurring charges, remained nearly flat at 12.2% in 1997 compared with 12.1%
in 1996. Non-recurring charges recorded in the fourth quarter of 1997 were $59.4
million (non-cash) and $5.3 million (cash) related to the vesting of the Merger
Incentive Options and the Management Agreements Termination, respectively.
During 1997, the Company accelerated certain discretionary expenditures that
represent investments in the future, specifically, preparation for the Year 2000
computer system issues and investments related to strategic planning. In
addition, the Company continues to improve warehouse and systems efficiencies to
produce high levels of customer and consumer satisfaction. Operating expenses as
a percent of net sales, including the aforementioned non-recurring charges, was
14.7% in 1997.
 
    INCOME FROM OPERATIONS.  Income from operations as a percent of net sales,
before non-recurring charges, increased to 5.2% from 4.9% in 1996. Including
non-recurring charges, income from operations as a percent of net sales was 2.7%
in 1997.
 
    INTEREST EXPENSE.  Interest expense as a percent of net sales was 2.1%
compared with 2.5% in 1996. This reduction reflects the continued leveraging of
fixed interest costs against higher sales.
 
    INCOME BEFORE INCOME TAXES AND EXTRAORDINARY ITEM.  Income before income
taxes and extraordinary item as a percent of net sales, excluding the impact of
non-recurring charges, increased to 3.1% from 2.4% in 1996. Including
non-recurring charges, income before income taxes and extraordinary item as a
percent of net sales was 0.6% in 1997.
 
    NET INCOME.  Net income in 1997 includes an extraordinary item, loss on the
early retirement of debt of $9.8 million ($5.9 million net of tax benefit of
$3.9 million) or 0.2% of net sales. Net income as a percent of net sales,
excluding the impact of non-recurring charges and early retirement of debt,
increased to 1.8% in 1997 from 1.4% in 1996. Including non-recurring charges and
extraordinary item, net income as a percent of net sales was 0.1% in 1997.
 
    FOURTH QUARTER RESULTS.  Certain expense and cost of sale estimates are
recorded throughout the year including inventory shrinkage, required LIFO
reserve, manufacturers' allowances, advertising costs and various expense items.
During the fourth quarter of 1997, the Company recorded a favorable net income
adjustment of approximately $2.9 million relating to the refinement of estimates
recorded in the prior three quarters.
 
    In the fourth quarter of 1997, United recognized the following charges (i)
pre-tax non-recurring charges of $59.4 million (non-cash) and $5.3 million
(cash) related to the vesting of the Merger Incentive Options and the Management
Agreements Termination (see Notes 10 and 13 to the Consolidated Financial
Statements of the Company included elsewhere herein), respectively, and (ii) an
extraordinary loss of $9.8 million ($5.9 million net of tax benefit of $3.9
million) related to the early retirement of debt (see Note 6 to the Consolidated
Financial Statements of the Company included elsewhere herein).
 
COMPARISON OF ACTUAL RESULTS FOR THE YEARS ENDED DECEMBER 31, 1996 AND 1995
 
    NET SALES.  Net sales increased 31.2% to $2.3 billion for 1996 from $1.8
billion for 1995. This increase was primarily the result of the Merger for a
full twelve months in 1996. Sales in 1995 include only nine months of the
Company's sales.
 
                                       42
<PAGE>
    GROSS PROFIT.  Gross profit as a percent of net sales declined to 17.0% in
1996 from 17.4% in 1995. This decrease reflected a shift in product mix, the
continuing consolidation of the Company's dealer base and deflation across the
Company's product mix.
 
    OPERATING EXPENSES.  Operating expenses decreased as a percent of net sales
to 12.1% in 1996, compared with 14.1% in 1995. The results for 1995 include the
impact of a restructuring charge of $9.8 million ($5.9 million net of tax
benefit of $3.9 million). The decline in the operating expense ratio before the
restructuring charge (12.1% in 1996 versus 13.5% in 1995) was primarily due to
the realization of merger synergies, cost containment, productivity improvements
and leveraging of fixed expenses.
 
    INCOME FROM OPERATIONS.  Income from operations as a percent of net sales
increased to 4.9% in 1996 from 3.3% in 1995.
 
    INTEREST EXPENSE.  Interest expense as a percent of net sales was 2.5% in
1996, compared with 2.6% in 1995. This reduction reflects the leveraging of
fixed interest costs against higher sales, partially offset by funding required
to acquire Lagasse (see Note 1 to the Consolidated Financial Statements of the
Company, included elsewhere herein).
 
    INCOME BEFORE INCOME TAXES AND EXTRAORDINARY ITEM.  Income before income
taxes and extraordinary item as a percent of net sales increased to 2.4% in 1996
from 0.7% in 1995.
 
    NET INCOME.  Net income as a percent of net sales increased to 1.4% in 1996
from 0.3% in 1995 resulting from the aforementioned reasons. Net income in 1995
includes an extraordinary item, loss on the early retirement of debt related to
the Merger of $2.4 million ($1.4 million net of tax benefit of $1.0 million) or
0.1% of net sales.
 
    FOURTH QUARTER RESULTS.  Certain expense and cost of sale estimates are
recorded throughout the year including inventory shrinkage, required LIFO
reserve, manufacturers' allowances, advertising costs and various expense items.
During the fourth quarter of 1996, the Company recorded approximately $3.0
million of additional net income relating to the refinement of estimates
recorded in the prior three quarters.
 
COMPARISON OF ACTUAL RESULTS FOR THE YEAR ENDED DECEMBER 31, 1996 AND
  SUPPLEMENTAL PRO FORMA RESULTS FOR THE YEAR ENDED DECEMBER 31, 1995
 
    NET SALES.  Net sales increased 4.4% to $2.3 billion for 1996 from $2.2
billion for 1995. This increase is primarily the result of higher unit sales in
all product categories. In addition, the Micro United division continued to
report strong growth resulting from the underlying strength in the marketplace.
The Company's year-long focus on improving the consistency and reliability of
its service led to increased sales and higher customer and consumer
satisfaction.
 
    GROSS PROFIT.  Gross profit as a percent of net sales declined to 17.0% in
1996 from 17.3% in 1995. This decrease reflected a shift in product mix, the
continuing consolidation of the Company's dealer base and deflation across the
Company's product mix.
 
    OPERATING EXPENSES.  Operating expenses decreased as a percent of net sales
to 12.1% in 1996, compared with 13.6% in 1995. This decrease is primarily due to
the realization of merger synergies, cost containment, productivity improvements
and leveraging of fixed expenses.
 
    INCOME FROM OPERATIONS.  Income from operations as a percent of net sales
increased to 4.9% in 1996 from 3.7% in 1995.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    As of March 31, 1998, the credit facilities under the Amended and Restated
Credit Agreement (the "Credit Agreement") consisted of $119.0 million of term
loan borrowings (the "Term Loan Facilities"),
 
                                       43
<PAGE>
and $224.0 million of borrowings under a $325.0 revolving loan facility under
the Existing Credit Facilities. In addition, the Company has $100.0 million of
12 3/4% Notes due 2005, $29.8 million of industrial revenue bonds and a $2.0
million mortgage.
 
    The term loan facilities under the Existing Credit Facilities consisted of a
$76.7 million tranche A term loan facility and a $42.3 million tranche B term
loan facility. On March 31, 1998, principal payments of $15.8 million and $8.7
million were paid from Excess Cash Flow (as defined in the Credit Agreement) for
the tranche A and tranche B facilities, respectively.
 
    The Credit Agreement contained representations and warranties, affirmative
and negative covenants and events of default customary for financings of this
type. As of March 31, 1998, the Company was in compliance with all covenants
contained in the Credit Agreement.
 
    Management believes that the Company's cash on hand, anticipated funds
generated from operations and available borrowings under the New Credit
Facilities, will be sufficient to meet the short-term (less than twelve months)
and long-term operating and capital needs of the Company as well as to service
its debt in accordance with its terms. There is, however, no assurance that this
will be accomplished.
 
    United is a holding company and, as a result, its primary source of funds is
cash generated from operating activities of its operating subsidiary, USSC, and
bank borrowings by USSC. The New Credit Agreement, the 8 3/8% Notes Indenture
and the 12 3/4% Notes Indenture contain restrictions on the ability of USSC to
transfer cash to United.
 
    The statements of cash flows for the Company for the periods indicated is
summarized below:
 
<TABLE>
<CAPTION>
                                                                      THREE MONTHS ENDED
                                       YEARS ENDED DECEMBER 31,           MARCH 31,
                                    -------------------------------  --------------------
                                      1995       1996       1997       1997       1998
                                    ---------  ---------  ---------  ---------  ---------
                                                   (DOLLARS IN THOUSANDS)
<S>                                 <C>        <C>        <C>        <C>        <C>
Net cash provided by operating
  activities......................  $  26,329  $   1,609  $  41,768  $  48,928  $  67,500
Net cash used in investing
  activities......................   (266,291)   (49,871)   (12,991)    (1,612)    (3,975)
Net cash provided by (used in)
  financing activities............    249,773     47,221    (27,029)   (40,351)   (64,388)
</TABLE>
 
COMPARISON OF ACTUAL CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 1998 AND
  1997
 
    Net cash provided by operating activities during the first three months of
1998 increased to $67.5 million from $48.9 million in the comparable prior-year
period. This increase was due to higher net income, a decrease in accounts
receivable and a decrease in inventory, partially offset by a decrease in
accrued liabilities.
 
    Net cash used in investing activities during the first three months of 1998
was $4.0 million compared with $1.6 million used in the first three months of
1997. The increase in cash used was due solely to an increase in capital
investments during 1998.
 
    Net cash used in financing activities during the first three months of 1998
was $64.4 million compared with $40.4 million for the first three months of
1997. This increase was due primarily to the reduction of debt due to lower
working capital requirements.
 
COMPARISON OF ACTUAL CASH FLOWS FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997 AND
  1996
 
    Net cash provided by operating activities for 1997 increased to $41.8
million from $1.6 million in 1996. This change was due to slower inventory
growth of $23.0 million, higher net income (before non-recurring charge) and an
increase in accrued liabilities of $35.2 million partially offset by a $21.4
million decline in deferred tax expense and a $38.0 million decline in accounts
payable. Net cash provided by operating activities for 1996 declined to $1.6
million from $26.3 million in 1995. This reduction was due to an
 
                                       44
<PAGE>
increased investment in inventory and a decrease in accrued liabilities offset
by higher net income and an increase in accounts payable.
 
    Net cash used in investing activities during 1997 was $13.0 million compared
with $49.9 million in 1996. The decrease was due to the acquisition of Lagasse
on October 31, 1996 offset by the collection of $11.1 million in 1996 from the
successful sale of closed facilities and related equipment. The decrease in net
cash used in investing activities of $49.9 million in 1996 from $266.3 million
in 1995 was primarily the result of the Merger.
 
    Net cash used in financing activities in 1997 was $27.0 million compared
with net cash provided of $47.2 million in 1996. The decrease was due to a $50.0
million partial redemption of the 12 3/4% Notes, a reduction of indebtedness
under the term loan facilities related to the Existing Credit Facilities of
$15.5 million, redemption of the Preferred Stock of $21.2 million and a $8.5
million payment related to employee income tax withholding for stock option
exercises offset by proceeds of $72.2 million (before deducting expenses)
related to the issuance of 2.0 million shares of Common Stock in the October
Equity Offering and additional borrowings under the revolver of $49.0 million
during 1997 compared with additional borrowings of $22.0 million in 1996. Net
cash provided by financing activities in 1996 was $47.2 million compared with
$249.8 million in 1995. The decrease was due to the financing of the Merger in
1995 offset by additional borrowings to finance the purchase of Lagasse.
 
NEW CREDIT FACILITIES
 
    On April 3, 1998, USSC entered into the New Credit Agreement with United as
guarantor, The Chase Manhattan Bank, as agent, and a group of banks and
financial institutions (including Chase, the "Senior Lenders"). The following is
a summary of the principal terms of the New Credit Agreement which summary does
not purport to be complete and is subject, and is qualified in its entirety by
reference, to all the provisions of the New Credit Agreement, as it may be
further amended from time to time, a copy of which is available upon request to
the Company.
 
    The New Credit Agreement provides for the funding of the Azerty Acquisition,
the refinancing of certain existing indebtedness and for other general corporate
purposes of the Company and its subsidiaries. The New Credit Facilities under
the New Credit Agreement consist of $150.0 million of borrowings pursuant to the
Tranche A Term Loan Facility and commitments of up to $250.0 million of
revolving loan borrowings pursuant to the Revolving Credit Facility (including a
sublimit of $90.0 million under the Revolving Credit Facility for letters of
credit). A portion of the Revolving Credit Facility is allocated for swingline
loans. The New Credit Facilities also included borrowings of $100.0 million
under the Tranche B Term Loan Facility. A substantial portion of the Tranche B
Term Loan Facility was repaid with the net proceeds from the Notes Offering. The
remainder of the Tranche B Term Loan Facility was permanently repaid with
proceeds from the sale of certain receivables under the Receivables
Securitization Program.
 
    The loans under the Tranche A Term Loan Facility and the Revolving Credit
Facility generally bear interest as determined within a set range with the rate
based on the ratio of total debt (which excludes the face amount of any undrawn
letters of credit) of USSC and its subsidiaries to EBITDA (as defined in the New
Credit Agreement). The Tranche A Term Loan Facility and the Revolving Credit
Facility bear interest, at the option of USSC and based upon financial
performance, at the base rate (i.e., the higher of the prime rate or federal
funds plus 0.50%) plus 0% to 0.75% or London Interbank Offered Rate ("LIBOR")
plus 1.00% to 2.00%.
 
    As of the date of this filing, the outstanding principal balance of the
Tranche A Term Loan Facility consists of $150.0 million and matures on or about
March 31, 2004, and no amount of the Tranche B Term Loan Facility remained
outstanding, which had been scheduled to mature on or about December 31, 2004.
The term loans under the Tranche A Term Loan Facility are repayable in
consecutive quarterly installments commencing on or about June 30, 1998, the
first four of which are each in the amount of $2.5 million, the next four of
which are each in the amount of $3.75 million, the next four of which are each
 
                                       45
<PAGE>
in the amount of $6.25 million, the next four of which are each in the amount of
$7.5 million and the last eight of which are each in the amount of $8.75
million.
 
    Loans under the Tranche A Term Loan Facility and the Revolving Credit
Facility may be prepaid at any time, and are subject to certain mandatory
prepayments out of (i) net proceeds received from the issuance of equity by
United or any of its subsidiaries subject to certain exceptions provided in the
New Credit Agreement, (ii) net proceeds from certain asset sales in excess of
$15.0 million, (iii) 50% of the Company's Excess Cash Flow (as defined in the
New Credit Agreement) minus any optional prepayments made on the Term Loans for
any fiscal year (commencing with the fiscal year ending December 31, 1998), but
only if the Debt to Cash Flow Ratio (as defined in the New Credit Agreement) as
of the last day of the fiscal year is greater than 3.75 to 1, (iv) net proceeds
received from casualty events subject to certain exceptions provided within the
New Credit Agreement and (v) net proceeds received from certain debt issuances.
Prepayments under the Tranche A Term Loan Facility will be applied pro rata to
the remaining installments due under the Tranche A Term Loan Facility and, next,
to the permanent reduction of commitments (and the payment of loans outstanding)
under the Revolving Credit Facility. Net proceeds of this Offering will be used
to repay a portion of the indebtedness under the Tranche A Term Loan Facility.
See "Use of Proceeds."
 
    The Tranche A Term Loan Facility and the Revolving Credit Facility are
guaranteed, on a joint and several basis, by the Company and certain of the
direct and indirect domestic subsidiaries of USSC.
 
    The Tranche A Term Loan Facility and the Revolving Credit Facility are
secured by perfected first priority pledges of the stock of the USSC, all of the
stock of the domestic direct and indirect subsidiaries of USSC and certain of
the stock of all of the foreign direct and indirect subsidiaries (other than the
Receivables Company) of USSC and security interests in, and liens upon, certain
accounts receivable, inventory, contract rights and other personal and certain
real property of the USSC and its domestic subsidiaries. The New Credit
Agreement provides for the complete release, upon request by USSC, of the liens
upon achievement of an investment grade rating for the unsecured long-term debt
of United or USSC for any quarter and a complete release in the event the
Leverage Ratio (as defined in the New Credit Agreement) is less than or equal to
3 to 1. The Majority Lenders (as defined in the New Credit Agreement) may
request that the security interests be regranted if the Leverage Ratio for any
subsequent quarter exceeds 3 to 1. In addition, the New Credit Agreement does
not permit the Senior Lenders to secure a lien in connection with the sale of
specified receivables under the Receivables Securitization Program.
 
    The New Credit Agreement contains certain restrictive covenants that, among
other things, limit the ability of USSC and its subsidiaries to dispose of
assets, incur indebtedness or liens, pay dividends or make other payments in
respect of capital stock or subordinated indebtedness, make investments or other
acquisitions, engage in mergers or consolidations, engage in transactions with
affiliates and engage in any business other than specified businesses. In
addition, the New Credit Agreement requires USSC to comply with certain
financial ratios and tests, including ratios of total debt to EBITDA, cash flow
to fixed charges, and EBITDA to interest expense and a minimum net worth test.
 
12 3/4% NOTES
 
    The 12 3/4% Notes were originally issued on May 3, 1995 pursuant to the
12 3/4% Notes Indenture. As of the date hereof, the aggregate outstanding
principal amount of the 12 3/4% Notes was $100.0 million. The 12 3/4% Notes are
unsecured senior subordinated obligations of USSC, and payment of the 12 3/4%
Notes is fully and unconditionally guaranteed by the Company and USSC's domestic
"restricted" subsidiaries on a senior subordinated basis. The 12 3/4% Notes
mature on May 1, 2005, and bear interest at the rate of 12 3/4% per annum,
payable semi-annually on May 1 and November 1 of each year.
 
    The 12 3/4% Notes Indenture governing the 12 3/4% Notes contains certain
covenants, including limitations on the incurrence of indebtedness, the making
of restricted payments, transactions with affiliates, the existence of liens,
disposition of proceeds of asset sales, the making of guarantees by restricted
subsidiaries,
 
                                       46
<PAGE>
transfer and issuances of stock of subsidiaries, the imposition of certain
payment restrictions on restricted subsidiaries and certain mergers and sales of
assets. See "Description of Certain Indebtedness--12 3/4% Notes."
 
8 3/8% NOTES
 
    The 8 3/8% Notes were issued on April 15, 1998 pursuant to the 8 3/8% Notes
Indenture. As of the date hereof, the aggregate outstanding principal amount of
8 3/8% Notes was $100.0 million. The 8 3/8% Notes are unsecured senior
subordinated obligations of USSC, and payment of the 8 3/8% Notes is fully and
unconditionally guaranteed by the Company and USSC's domestic subsidiaries that
incur Indebtedness (as defined in the 8 3/8% Notes Indenture) on a senior
subordinated basis. The 8 3/8% Notes mature on April 15, 2008, and bear interest
at the rate of 8 3/8% per annum, payable semi-annually on April 15 and October
15 of each year.
 
    The 8 3/8% Notes Indenture governing the 8 3/8% Notes contains certain
covenants, including limitations on the incurrence of indebtedness, the making
of restricted payments, transactions with affiliates, the existence of liens,
disposition of proceeds of asset sales, the making of guarantees by restricted
subsidiaries, transfer and issuances of stock of subsidiaries, the imposition of
certain payment restrictions on restricted subsidiaries and certain mergers and
sales of assets. In addition, the 8 3/8% Notes Indenture provides for the
issuance thereunder of up to $100.0 million aggregate principal amount of
additional 8 3/8% Notes having substantially identical terms and conditions to
the 8 3/8% Notes, subject to compliance with the covenants contained in the
8 3/8% Notes Indenture, including compliance with the restrictions contained in
the 8 3/8% Notes Indenture relating to incurrence of indebtedness. See
"Description of Certain Indebtedness--8 3/8% Notes."
 
RECEIVABLES SECURITIZATION PROGRAM
 
    On April 3, 1998, in connection with the refinancing of its Existing Credit
Facilities, the Company entered into the $163.0 million 364-day Receivables
Securitization Program pursuant to which the Company sells its Eligible
Receivables (except for certain excluded receivables) to the Receivables
Company, a wholly-owned offshore, special purpose limited liability company
intended to be bankruptcy-remote. The Receivables Company then transfers the
Eligible Receivables to a third-party, multi-seller asset-backed commercial
paper program. The Third-Party Seller's purchases of the Eligible Receivables
are supported by a facility between the Third-Party Seller and banks with
ratings of A-1/P-1 or higher. The sale of trade receivables includes not only
those Eligible Receivables that were existing on the closing date of the
Receivables Securitization Program, but also Eligible Receivables created
thereafter. The Company received approximately $160.0 million in proceeds from
the initial sale of Eligible Receivables on April 3, 1998.
 
    The Chase Manhattan Bank acts as funding agent and, together with other
commercial banks rated at least A-1/P-1, provides standby liquidity funding to
support the purchase of the receivables by the Receivables Company. The proceeds
from the Receivables Securitization Program were used to reduce borrowings under
the Company's Revolving Credit Facility. The Receivables Company retains an
interest in the Eligible Receivables transferred to the third party. The
Receivables Securitization Program carries an effective interest rate of LIBOR
plus 0.37%. As a result of the Receivables Securitization Program, actual
balance sheet assets of the Company as of March 31, 1998 of approximately $160.0
million, consisting of accounts receivable, have been sold to the Receivables
Company and do not secure the Company's obligations under the New Credit
Facilities.
 
INFLATION/DEFLATION AND CHANGING PRICES
 
    Inflation can have an impact on the Company's earnings. During inflationary
times, the Company generally seeks to increase prices to its customers creating
incremental gross profit resulting from the sale of inventory purchased at lower
prices. Alternatively, significant deflation may adversely affect the Company's
profitability.
 
                                       47
<PAGE>
YEAR 2000 MODIFICATIONS
 
    The Company recognizes the potential business impacts related to the Year
2000 computer system issue. The issue is one where computer systems may
recognize the designation "00" as 1900 when it means 2000, resulting in system
failure or miscalculations. The Company began to address the Year 2000 issue in
1996, and continues to implement measures to ensure its business operations are
not disrupted. The Company's plan requires that all modifications necessary to
make its computer systems Year 2000 compliant must be completed during 1999. In
1997, the Company incurred approximately $1.4 million of expenses related to
this issue and expects to incur an additional $2.6 million to $3.3 million of
such expenses over the next two years. For the three months ended March 31,
1998, the Company incurred $0.3 million of such expenses.
 
SEASONALITY
 
    Although the Company's sales are generally level throughout the year, the
Company's sales vary to the extent of seasonal differences in the buying
patterns of end-users who purchase office products. In particular, the Company's
sales are generally higher than average during January when many businesses
begin operating under new annual budgets.
 
    The Company experiences seasonality in terms of its working capital needs,
with highest requirements in December through February reflecting a build up in
inventory prior to and during the peak sales period. The Company believes that
its current availability under the Revolving Credit Facility is sufficient to
satisfy such seasonal capital needs for the foreseeable future. See "--Liquidity
and Capital Resources."
 
                                       48
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    United Stationers is the largest broad line wholesale distributor of
business products in North America, with annual sales of more than twice its
next largest competitor. The Company offers more than 35,000 SKUs, including
traditional office products, office furniture, information technology products,
facilities management supplies and janitorial and sanitation supplies. The
Company's customer base is comprised of more than 20,000 reseller customers,
including office products dealers, office furniture dealers, office products
superstores, mass merchandisers, computer products resellers, mail order
companies, and sanitary supply distributors. United Stationers serves its
customers through integrated nationwide networks of 41 business products
distribution centers, 18 janitorial and sanitation distribution centers and five
information technology products distribution centers. In addition to its broad
product offering, the Company provides value-added marketing and logistics
services to both manufacturers and resellers. For the year ended December 31,
1997, the Company's net sales and operating income were $2.6 billion and $70.2
million (after non-recurring charges of $64.7 million), respectively, and the
Company's supplemental pro forma net sales and operating income were $2.9
billion and $148.5 million, respectively.
 
THE BUSINESS PRODUCTS INDUSTRY
 
    The Company operates in a large and fragmented industry (with sales of more
than $120 billion in manufacturers' shipments in 1996 based on independent
industry sources) that has been experiencing consolidation. The business
products industry consists of several different channels by which business
products are distributed from the manufacturer to the end user, including
resellers buying through wholesalers and resellers purchasing directly from
manufacturers. Consolidation has occurred in recent years throughout all levels
of the business products industry. As a result of this consolidation, the
distinct boundaries that once clearly defined distribution channels have become
blurred. Over the last decade, office products superstores (which largely buy
directly from manufacturers) have entered virtually every major metropolitan
market. Despite the industry consolidation, no single reseller accounted for
more than 6% of the Company's pro forma net sales in 1997. The business products
industry consists principally of wholesalers, business products dealers
(including commercial, contract and retail), office products superstores,
computer products resellers, office furniture dealers, sanitary supply
distributors, mail order companies and mass merchandisers, each as described in
greater detail below:
 
    BUSINESS PRODUCTS WHOLESALERS.  The wholesale segment of the business
products industry consists of national, specialty and regional wholesalers. The
Company competes with one other national business products wholesaler on the
basis of breadth and depth of product offering, price and the provision of
extensive marketing and distribution services for their reseller customers.
Specialty office products wholesalers focus on limited product lines such as
computer supplies, legal supplies, writing instruments, office furniture and
facilities management supplies. Regional office products wholesalers generally
offer a broad range of office products and marketing services on a smaller and
more limited scale and within a much more limited geographic area than national
office products wholesalers.
 
    BUSINESS PRODUCTS DEALERS.  Business products dealers include commercial
dealers, contract stationers (e.g., Boise Cascade Office Products, BT Office
Products International, Corporate Express, U.S. Office Products) and the
contract stationer divisions of national office product superstores (e.g.,
Staples and Office Depot) and retail dealers. The most significant reseller
channel for office products distribution continues to be commercial dealers and
contract stationers that serve medium and large-sized business customers through
the use of catalogs and sales forces. These resellers typically stock products
in distribution centers and deliver them to customers on a next-day basis
against orders received electronically, by telephone or fax, or taken by a
salesperson while calling on a customer. Major commercial dealers and contract
stationers purchase in large quantities directly from manufacturers and rely
upon wholesalers
 
                                       49
<PAGE>
for safety stock and certain slower-moving generally higher margin SKUs in order
to provide product breadth and offer significant volume-related discounts and a
high level of service to their customers.
 
    Retail office products dealers typically serve small and medium-sized
businesses, home offices and individuals. For many years, retail dealers
consisted principally of a large number of independent dealers, operating one or
a few relatively small stores in a single local area. During the last decade,
however, the office products retail market has undergone significant change,
including the elimination or consolidation of many retail dealers (including
most traditional stationery stores), as a result of the emergence and rapid
growth of discount office supply retailers, which are known as superstores. To
compete with the lower prices generally offered on commodity products by
superstores, many independent retail dealers have joined marketing or buying
groups to negotiate on a collective basis directly with manufacturers and
wholesalers, or have altered their business strategies to adapt to lower gross
margins and reduce their operating expenses.
 
    OFFICE PRODUCTS SUPERSTORES.  Office products superstores (e.g., Office
Depot, OfficeMax, Staples) employ a warehouse format, are typically open for
business seven days a week, stock a select number of items in inventory
(typically in the range of 5,000 to 7,000 products), purchase in volume,
typically take delivery at their stores directly from manufacturers and offer
many of their products at discounts from manufacturers' suggested list prices.
Virtually every major metropolitan area in the United States is now served by at
least one, and most by more than one, office products superstore. Office
products superstores may also purchase from wholesalers for "fill-in" needs and
to fill customer orders from special wholesaler catalogs made available to end
users in certain superstores when the superstore does not carry an item. This
allows the office products superstores to expand the range of products offered
without increasing their inventory levels.
 
    COMPUTER PRODUCTS RESELLERS.  Because computers are now widely used in
offices, more business products are computer related and, therefore, are sold
through computer products resellers (e.g., Computer Discount Warehouse,
CompUSA). In addition, most computer products resellers now offer a limited
selection of more traditional office products.
 
    OFFICE FURNITURE DEALERS.  Office furniture is a major product category
within the business products industry. Although nearly all broad line office
products dealers sell office furniture, approximately 75% of all new office
furniture is sold through office furniture dealers.
 
    SANITARY SUPPLY DISTRIBUTORS.  This customer class is now included in the
business products industry as wholesalers have expanded their product offerings
to include janitorial and sanitation supplies.
 
    MAIL ORDER COMPANIES.  Mail order marketers of office products (e.g., Quill,
Reliable Office Products, Viking Office Products) typically serve small and
medium-sized business customers and home offices. While their procurement and
order fulfillment functions are similar to contract stationers, they rely
exclusively on catalogs and other database marketing programs, rather than
direct sales forces, to sell their product offerings. Their operations are based
upon large, proprietary customer data bases and sophisticated circulation
strategies drawn from end-user marketing programs. Mail order companies purchase
from both wholesalers and manufacturers.
 
    MASS MERCHANDISERS.  The mass market retailers (e.g., Kmart, Price/Costco,
Sears, Target, Wal-Mart Stores/Sam's Club) have recently taken a growing
interest in business products. Office supplies is one of many categories of
products typically available in these stores. Certain of these retailers rely on
wholesalers to fulfill a portion of their customers' orders.
 
COMPETITIVE STRENGTHS
 
    During the last several years, the Company has strengthened its competitive
position in the business products industry through the following:
 
                                       50
<PAGE>
    SIGNIFICANT SCALE.  As the largest broad line business products wholesaler
in North America, the Company qualifies for substantial volume allowances and
can realize significant economies of scale. In addition, the Company's size and
nationwide service and distribution capabilities enable it to: (i) service the
demands of large national, regional, local and individual reseller accounts by
offering products from over 550 manufacturers; (ii) seek cost-effective sourcing
of products both in North America and internationally; and (iii) mitigate the
effect of local or regional economic downturns.
 
    COST EFFECTIVE OPERATIONS.  The Company seeks cost reductions at both the
corporate and operating levels in order to improve its efficiency. Examples of
such cost reduction efforts include: (i) reduced merchandise procurement and
handling costs through higher manufacturers' incentives and better terms; (ii)
continued efforts to increase inventory efficiency without lowering order fill
rates; (iii) reduced payroll and benefits costs through improved labor
allocation and higher productivity; (iv) reduced freight costs through ongoing
refinements to delivery systems; (v) increased sourcing of certain products from
lower cost sources; (vi) streamlined work practices and procedures; and (vii)
increased leveraging of fixed costs over an increasing sales base.
 
    BROAD PRODUCT SELECTION.  Stocking over 35,000 SKUs, the Company offers the
broadest selection of business products in the industry, providing resellers
with one-stop shopping for their business products needs. The Company's size
allows it to maintain a broad product selection, thereby enabling its customers
to hold less inventory while still providing end users with a high level of
service.
 
    HIGH LEVEL OF CUSTOMER SERVICE.  The Company believes that a key component
of its success has been its focus on customer service and support. Customer
service includes: ease of ordering, rapid access to information, high order fill
rates, on-time accurate shipments and value-added management and marketing
assistance. The Company's integrated computer information systems serve an
important role in providing a high level of customer service, as it allows the
Company to provide resellers with the ability to manage electronically critical
business functions, including order entry, purchasing, pricing, accounts
receivable, accounts payable and inventory control. These integrated computer
systems also are designed, in part, to enable the Company to monitor five key
measures of customer satisfaction: order fill rate, order accuracy, inventory
accuracy, on-time delivery and accessibility of the Company's personnel to
customers. The Company also supports resellers' marketing efforts by designing
informative, user-friendly catalogs and other marketing materials.
 
    The Company continues to introduce additional services, such as its "wrap
and label" program that offers resellers the option to receive prepackaged
orders customized (and labeled with the reseller's name) to meet the
specifications of particular end users. The Company can also drop ship orders
directly to end users on behalf of resellers. These services allow resellers to
lower their inventory investment and minimize handling costs.
 
BUSINESS STRATEGY
 
    United Stationers' strategy is to create value in the supply chain for both
resellers and manufacturers. By reducing the overall cost of distribution, the
Company believes its role as a wholesaler will continue to grow and that it can
achieve above industry average growth rates by:
 
    CAPTURING A GREATER SHARE OF EXISTING CUSTOMERS' PURCHASES.  The Company
believes that it has the opportunity to capture a portion of the sales of
business products currently sold directly by manufacturers to resellers and end
users without wholesaler involvement. The Company estimates that only
approximately 20% of business products sales are made through wholesale
distributors and that approximately 80% are made directly from manufacturers to
resellers. As resellers intensify their focus on asset management and return on
investment, the Company believes that they will increasingly rely on the
Company's value-added marketing and logistics services to meet end-user
requirements for a high and accurate order fill rate on an overnight basis. The
Company also believes that the focus by resellers on
 
                                       51
<PAGE>
inventory efficiency leading to de-stocking will continue in the foreseeable
future, creating an opportunity to capture a greater percentage of the
resellers' purchases. Further, the Company believes that manufacturers support
this shift to wholesaler involvement for products that are ordered in
less-than-case quantities because of the relatively high handling costs of such
orders.
 
    EXPANDING ITS CUSTOMER BASE.  The Company plans to continue to expand its
customer base by: (i) maintaining and building its business with commercial
dealers and contract stationers (including the contract stationer divisions of
national office products superstores) who, through consolidation, have continued
to increase in size; (ii) developing additional programs for marketing and
buying groups that represent groups of dealers; (iii) continuing to focus on
complementary markets, including specialty dealers (e.g., furniture, computer
and janitorial and sanitation supply distributors); and (iv) expanding
geographically and potentially into international markets.
 
    OFFERING A BROADER LINE OF PRODUCTS AND SERVICES.  While United Stationers
carries the broadest product line in the industry, it continues to enhance its
product and service offerings to meet changing end-user demands. The Company's
product line expansion plans include developing its newer product categories,
such as office furniture, information technology products, facilities management
supplies and janitorial and sanitation supplies as well as potentially offering
new products and services. The Company believes that these product categories
will allow it to make additional sales to existing reseller customers and
thereby strengthen its position with such resellers as a one-stop shopping
experience. Such products also allow the Company to enter into new distribution
channels and add new types of resellers beyond broad line office products
dealers, thereby expanding its customer base.
 
    The Company also continues to expand its line of private brand products,
including approximately 1,200 products under the Universal brand name. Private
brand products represented approximately 9% of the Company's pro forma net sales
in 1997. The Company believes its private brand products offer significant
benefits both to resellers, by providing an alternative to brand name products
that offers similar quality at a moderate price, and to manufacturers, by
enabling the manufacturer to increase sales without diluting its brand name
pricing structure. To further develop the Universal brand, the Company operates
a trading office in Hong Kong to facilitate the global purchasing of products.
 
    CAPITALIZING ON CROSS-SELLING OPPORTUNITIES.  Historically, the Company has
marketed its business products and services primarily to office products
resellers, including commercial dealers, contract stationers, retail dealers and
office products superstores. As the Company has expanded into new product lines
(e.g., janitorial and sanitation supplies), its sales efforts have been focused
primarily on traditional distributors of these specialty products. Although the
Company will continue to utilize these marketing channels as its primary method
of product distribution, the Company believes that its various products and
services are complementary and that significant opportunities exist to
cross-sell to its existing customer base. It is the Company's goal to become
known among its customers not just as an office products distributor, but as a
distributor of a broad range of products and services for the office. Management
believes that by implementing this strategy, the Company can enhance sales to
its existing customer base as resellers purchase a broader selection of products
offered by the Company, thereby reducing procurement costs and enhancing
reseller profitability.
 
    INCREASING TECHNOLOGICAL CAPABILITIES AND UTILIZING ELECTRONIC
COMMERCE.  The Company intends to continue to invest in systems enhancements as
well as customer interfaces to make its systems more user friendly. Increased
electronic linkages for transactions with customers and suppliers enable both
the Company and its business partners to reduce their costs and execute
transactions faster and more accurately. In 1997, approximately 80% of the
Company's orders (on a pro forma basis) were received electronically. As the
Company increases the functionality of its proprietary systems, the Company
believes it will be able to garner a growing percentage of its customers'
business.
 
                                       52
<PAGE>
    As the Internet becomes increasingly important as a marketing channel, the
Company is positioned to participate in this trend. The Company currently
provides resellers with access to its general line catalog online through
seamless links to its web site. This service allows resellers to place orders
electronically with the Company for overnight delivery as well as to provide a
hot link on their own web site to the Company's general line catalog for use by
end users.
 
    MAKING STRATEGIC ACQUISITIONS.  The Company believes it can enhance its
growth by continuing to make strategic acquisitions. For example, the
acquisition of Lagasse in 1996 substantially increased the Company's position in
the janitorial and sanitation supplies product category. The Azerty Acquisition
also will expand its product offerings and will make the Company one of the
largest distributors of computer consumable supplies in the United States. The
Company intends to continue, from time to time, to pursue acquisitions that
expand its customer base, increase its geographic reach and/or broaden its
product offering.
 
PRODUCTS
 
    The Company's current product offerings, comprised of more than 35,000 SKUs,
may be divided into five primary categories:
 
    TRADITIONAL OFFICE PRODUCTS.  The Company's core business continues to be
traditional office products, which includes both brand-name products and the
Company's private brand products. Traditional office products include writing
instruments, paper products, organizers and calendars and various office
accessories. This product category represents approximately half of the
Company's 1997 pro forma net sales.
 
    INFORMATION TECHNOLOGY PRODUCTS.  The Company offers computer supplies,
peripherals and hardware with major brand names to computer products resellers
and office products dealers. These products represented approximately 32% of the
Company's 1997 pro forma net sales.
 
    OFFICE FURNITURE.  The Company's sale of office furniture such as leather
chairs, wooden and steel desks and computer furniture has enabled it to become
the nation's largest office furniture wholesaler, with the Company currently
offering nearly 4,000 furniture items from 50 different manufacturers. Office
furniture represented approximately 13% of the Company's 1997 pro forma net
sales. The Company's "Pro-Image" consulting program enables resellers with no
previous expertise to provide high-end furniture and office design services to
end users. The Company offers national delivery and product "set-up"
capabilities to support office products dealers as well as to attract new
furniture dealers.
 
    JANITORIAL AND SANITATION SUPPLIES.  The Company's dedicated marketing
effort for janitorial and sanitation supplies was created in 1993 with the
development of United Facility Supply. In October 1996, the Company acquired
Lagasse, the largest pure wholesaler of janitorial and sanitation supplies in
North America. The Company currently distributes these products through 18
Lagasse distribution centers. Janitorial and sanitation supplies represented
approximately 4% of the Company's 1997 pro forma net sales.
 
    OTHER PRODUCTS.  The Company's newest product categories encompass
facilities management supplies, specialty mailroom and warehouse items, kitchen
and cafeteria items, first aid products and ergonomic products designed to
enhance worker productivity, comfort and safety. Another one of the Company's
niche markets is business presentation products, including audio visual
equipment, flip charts and dry erase boards. Additionally, the Company offers
its "Signature Image" program, which provides resellers with access into the
advertising specialties market (such as imprinted and logo items).
 
PURCHASING AND MERCHANDISING
 
    As the largest business products wholesaler in North America, the Company
qualifies for substantial volume allowances and can realize significant
economies of scale. The Company obtains products from
 
                                       53
<PAGE>
over 550 manufacturers, for many of whom the Company believes it is a
significant customer. In 1997 (on a pro forma basis), no supplier accounted for
more than 17% of the Company's aggregate purchases. As a centralized corporate
function, the Company's merchandising department interviews and selects
suppliers and products for inclusion in the catalogs. Selection is based upon
end-user acceptance and demand for the product and the manufacturer's total
service, price and product quality offering.
 
CUSTOMERS
 
    The Company sells principally to resellers of office products, consisting
primarily of commercial dealers and contract stationers, retail dealers,
superstores, mail order companies and mass merchandisers. In addition, the
Company sells to office furniture dealers, computer products resellers and
janitorial and sanitary supply distributors. No single reseller accounted for
more than 6% of the Company's pro forma net sales in 1997.
 
    Commercial dealers and contract stationers are the most significant reseller
channel for office products distribution and typically serve large businesses,
institutions and government agencies. Through industry consolidation, the number
of such dealers has decreased, with the remaining dealers growing larger. As a
result, net sales to these commercial dealers and contract stationers as a group
have grown rapidly.
 
    The number of retail dealers has been declining for some time as the result
of individual retail dealers' inability to compete successfully with the growing
number of superstores and, more recently, as a result of dealerships being
acquired and brought under an umbrella of common ownership. To adapt to this
highly competitive environment, many retail dealers, commercial dealers and
contract stationers have joined marketing or buying groups in order to increase
purchasing leverage. The Company believes it is the leading wholesale source for
many of these groups, providing not only merchandise but also special programs
that enable these dealers to take advantage of their combined purchasing power.
 
    While the Company maintains and builds its business with commercial dealers,
contract stationers (including the contract stationer divisions of national
office product superstores) and retail dealers, it also has relationships with
most major office products superstore chains. In addition, the Company supplies
inventory and other fulfillment services to the retail operations of certain
superstores, including their direct-to-business delivery programs and to
non-stocking resellers.
 
MARKETING AND CUSTOMER SUPPORT
 
    The Company concentrates its marketing efforts on providing value-added
services to resellers. The Company distributes products that are generally
available at similar prices from multiple sources, and most of its customers
purchase their products from more than one source. As a result, the Company
seeks to differentiate itself from its competitors through a broader product
offering, a higher degree of product availability, a variety of high quality
customer services and prompt distribution capabilities. In addition to
emphasizing its broad product line, extensive inventory, computer integration
and national distribution capabilities, the Company's marketing programs have
relied upon two additional major components. First, the Company produces an
extensive array of catalogs for commercial dealers, contract stationers and
retail dealers that are usually custom imprinted with each reseller's name and
sold to these resellers who, in turn, distribute the catalogs to their
customers. Second, the Company provides its resellers with a variety of dealer
support and marketing services, including business management systems,
promotional programs and pricing services. These services are designed to aid
the reseller in differentiating itself from its competitors by addressing the
steps in the end-user's procurement process.
 
    Substantially all of the Company's 35,000 SKUs are sold through its
comprehensive general line catalogs, promotional pieces and specialty catalogs
for the office products, office furniture, facilities management supplies and
other specialty markets. The Company produces the following annual catalogs:
General Line Catalog; Office Furniture Catalog featuring furniture and
accessories; Universal Catalog
 
                                       54
<PAGE>
promoting the Company's private-brand merchandise; Computer Products Catalog
offering hardware, supplies, accessories and furniture; Facilities and
Maintenance Supplies Catalog featuring janitorial, maintenance, food service,
warehouse, mailroom supplies and products and supplies used for meetings and
presentations; and the Lagasse Catalog offering janitorial and sanitation
supplies. In addition, the Company produces the following quarterly promotional
catalogs: Action 2000, featuring over 1,000 high-volume commodity items, and
Computer Concepts, featuring computer supplies, peripherals, accessories and
furniture. The Company also produces separate quarterly flyers covering general
office supplies, office furniture and Universal products. The majority of the
expenses related to the production of such catalogs is borne by the Company's
suppliers. Because commercial dealers, contract stationers and retail dealers
typically distribute only one wholesaler's catalogs in order to streamline and
concentrate order entry, the Company attempts to maximize the distribution of
its catalogs by offering advertising credits to resellers, which can be used to
offset the cost of catalogs. Also, the Company offers an electronic catalog
available on CD-ROM and through the Company's web site.
 
    The Company also offers to its resellers a variety of electronic order entry
systems and business management and marketing programs that enhance the
resellers' ability to manage their businesses profitably. For instance, the
Company maintains electronic data interchange systems that link the Company to
selected resellers and interactive order systems that link the Company to
selected resellers and such resellers to the ultimate end user. In addition, the
Company's electronic order entry systems allow the reseller to forward its
customers' orders directly to the Company, resulting in the delivery of pre-sold
products to the reseller or directly to its customers. The Company estimates
that in 1997 (on a pro forma basis), it received approximately 80% of its orders
electronically.
 
    In addition to marketing its products and services through the use of its
catalogs, the Company employs a sales force of approximately 150 salespersons.
The sales force is responsible for sales and service to resellers with which the
Company has an existing relationship, as well as for establishing new
relationships with additional resellers. The Company supplements the efforts of
its sales force through telemarketing.
 
PRODUCT DISTRIBUTION AND DELIVERY SYSTEMS
 
    The Company has a network of 41 business products regional distribution
centers located in 25 states in the United States, most of which carry the
Company's full line of inventory. The Company also maintains 18 Lagasse
distribution centers that carry a full line of janitorial and sanitation
supplies and five information technology distribution centers serving the United
States and Mexico. The Company supplements its regional distribution centers
with 24 local distribution points throughout the United States that serve as
reshipment points for orders filled at the regional distribution centers. The
Company utilizes more than 400 trucks, substantially all of which are contracted
for by the Company, to enable direct delivery from the regional distribution
centers and local distribution points to resellers.
 
    The Company's distribution capabilities are aided by its proprietary,
computer-driven inventory locator system. If a reseller places an order for an
item that is out of stock at the Company location which usually serves the
particular reseller, the Company's system will automatically search for the item
at alternative distribution centers. If the item is available at an alternative
location, the system will automatically forward the order to that alternate
location, which will then coordinate shipping with the primary facility and, for
the majority of resellers, provide a single on-time delivery. The system
effectively provides the Company with added inventory support that enables it to
provide higher service levels to the reseller, to reduce back orders and to
minimize time spent searching for merchandise substitutes, all of which
contribute to the Company's high order fill rate and efficient levels of
inventory balances. See "Risk Factors--Potential Service Interruptions."
 
    Another service offered by the Company to resellers is its "wrap and label"
program, that offers resellers the option to receive prepackaged orders
customized to meet the specifications of particular end
 
                                       55
<PAGE>
users. For example, when a reseller receives orders from a number of separate
end users, the Company can group and wrap the items separately by end user so
that the reseller need only deliver the package. The "wrap and label" program is
attractive to resellers because it eliminates the need to break down case
shipments and to repackage the orders before delivering them to the end user.
The Company also can ship orders directly to end users on behalf of resellers.
 
TECHNOLOGY
 
    The Company believes its management information systems, telecommunications
networks and warehouse automation systems, along with its participation in
electronic commerce are integral to the Company's success and have enabled the
Company to achieve one of the lowest cost structures and highest levels of
service in the industry.
 
    The Company operates integrated management information systems. Order entry,
fulfillment and billing, along with inventory replenishment and accounts payable
disbursement, are all automated. The Company's management information systems
are designed to process over 600,000 customer orders per day, supporting
relatively short order-to-delivery time windows. Management believes speed and
accuracy are important in the highly competitive business products industry.
Over 80% of the orders received from the Company's customers are electronic
orders and over 85% of the Company's purchase orders to its 550 suppliers are
transmitted electronically.
 
    The Company also employs a sophisticated warehouse automation system. In
certain locations, computerized conveyor systems, carousels and bar-code
scanning are utilized to increase efficiency and quality. The Company
continuously enhances its warehousing operations through the use of technology
to meet the changing business environment and customer and consumer
requirements.
 
    The Company believes electronic commerce conducted over the Internet will
grow in importance in the future and has invested in developing its own
interactive web site (www.unitedstationers.com), an Intranet and software
products available to its reseller customers. Electronic product catalogs are
available both over the Internet and in CD-ROM versions.
 
    Management plans to continue to invest in technology to improve quality,
reliability and cost-effective operations. The Company believes its systems are
sufficient to meet its current needs and management estimates the Company will
spend approximately $8 million in computer-related capital improvements in 1998.
 
COMPETITION
 
    The Company competes with office products manufacturers and with other
national, regional and specialty wholesalers of office products, office
furniture, computers and related items. Competition between the Company and
manufacturers is based primarily upon net pricing, minimum order quantity and
product availability. Although manufacturers may provide lower prices to
resellers than the Company does, the Company's marketing and catalog programs,
combined with speed of delivery and its ability to offer resellers a broad line
of business products from multiple manufacturers on a "one-stop shop" basis and
with lower minimum order quantities, are important factors in enabling the
Company to compete effectively. Manufacturers typically sell their products
through a variety of distribution channels, including wholesalers and resellers.
See "--Marketing and Customer Support" and "--Product Distribution and Delivery
Systems."
 
    Competition between the Company and other wholesalers is based primarily on
breadth of product lines, availability of products, speed of delivery to
resellers, order fill rates, net pricing to resellers and the quality of its
marketing and other services. The Company believes it is competitive in each of
these areas. Most wholesale distributors of office products conduct operations
regionally and locally, sometimes with
 
                                       56
<PAGE>
limited product lines such as writing instruments or computer products. Only one
other national wholesaler carries a general line of office products.
 
    Increased competition in the office products industry, together with
increased advertising, has heightened price awareness among end users. As a
result, purchasers of commodity type office products have become extremely price
sensitive, and therefore, the Company has increased its efforts to market to
resellers the continuing advantages of its competitive strengths (as compared to
those of manufacturers and other wholesalers).
 
EMPLOYEES
 
    As of June 10, 1998, the Company employed approximately 5,900 persons.
 
    The Company considers its relations with employees to be good. Approximately
1,000 of the shipping, warehouse and maintenance employees at certain of the
Chicago, Detroit, Philadelphia, Baltimore, Los Angeles, Minneapolis and New York
City facilities are covered by collective bargaining agreements. The agreements
expire at various times during the next three years. The Company has not
experienced any work stoppages during the past five years. See "Risk
Factors--Potential Service Interruptions."
 
LEGAL PROCEEDINGS
 
    In May 1998, Azerty Mexico received an official notice and request for
documents from the Director General of Investigations of the Federal Competition
Commission of Mexico with respect to an investigation of the distribution
practices of one of Azerty Mexico's suppliers. At this time, the Company does
not believe that Azerty Mexico is a target of this investigation or that this
investigation will result in a material adverse effect upon the Company's
financial condition or results of operations taken as a whole.
 
    Although the Company is also involved in legal proceedings arising in the
ordinary course of its business, the Company is not involved in any legal
proceeding that it believes will result, individually or in the aggregate, in a
material adverse effect upon the financial condition or results of operations of
the Company.
 
TRADEMARKS
 
    The trade names United Stationers, Micro United, Universal, United Facility
Supply, Azerty and others, are actively used and are significant to the
Company's business. Certain of the Company's trademarks have been federally
registered with the U.S. Patent and Trademark Office.
 
PROPERTIES
 
    The Company considers its properties to be suitable and adequate for their
intended uses. These properties consist of the following:
 
    EXECUTIVE OFFICES.  The Company owns its office facility in Des Plaines,
Illinois which has approximately 135,800 square feet of office and storage
space. In addition, the Company leases approximately 47,000 square feet of
office space located in Mount Prospect, Illinois. This lease expires in 1999,
with an option to renew for two consecutive three-year terms. Azerty owns its
corporate headquarters office facility in Orchard Park, New York, which has
approximately 28,000 square feet (19,000 square feet of which consists of
unutilized warehouse space).
 
                                       57
<PAGE>
    DISTRIBUTION CENTERS.  The Company presently has more than 8.0 million
square feet of warehouse space in 41 business products distribution centers, 18
Lagasse distribution centers and five information technology distribution
centers. The Company also operates 24 local distribution points. The following
tables set forth information regarding the Company's principal leased and owned
distribution centers:
 
USSC AND LAGASSE FACILITIES:
 
<TABLE>
<CAPTION>
                                                                                            APPROX. SQUARE FEET
                                                                      METROPOLITAN         ----------------------
STATE                                            CITY                  AREA SERVED           OWNED      LEASED
- ---------------------------------------  ---------------------  -------------------------  ---------  -----------
<S>                                      <C>                    <C>                        <C>        <C>
Arizona................................  Tempe                  Phoenix                           --     110,000
California.............................  Bell                   Los Angeles                       --      24,960
                                         City of Industry(1)..  Los Angeles                  344,487     125,000
                                         Sacramento(1)          Sacramento                        --     119,260
                                         Sacramento             Sacramento                        --     267,284
                                         Union City             San Francisco                     --      25,986
Colorado...............................  Denver                 Denver                       104,244          --
                                         Denver                 Denver                            --     134,893
Florida................................  Dania                  Miami                             --      22,564
                                         Jacksonville           Jacksonville                  95,500          --
                                         Tampa                  Tampa                        128,000          --
                                         Tampa                  Tampa                             --      30,000
                                         Ft. Lauderdale         Miami                             --     151,500
Georgia................................  Atlanta                Atlanta                           --      54,400
                                         Norcross               Atlanta                      372,000          --
Illinois...............................  Carol Stream           Chicago                           --     139,444
                                         Forest Park            Chicago                      222,280      81,000
                                         Forest Park            Chicago                           --      34,600
                                         Glendale Heights       Chicago                           --      50,533
                                         Greenville             St. Louis                    210,000          --
Indiana................................  Indianapolis           Indianapolis                 128,000          --
                                         Indianapolis           Indianapolis                      --      34,039
Louisiana..............................  Harahan                New Orleans                       --     104,885
                                         Harahan(1)             New Orleans                       --      82,650
Maryland...............................  Harmans                Baltimore/Wash., D.C.        323,980      45,000
                                         Harmans                Baltimore/Wash., D.C.             --      37,597
Massachusetts..........................  Sharon                 Boston                            --      40,000
                                         Woburn                 Boston                       309,000          --
Michigan...............................  Livonia                Detroit                      229,700      33,500
                                         Van Buren              Detroit                           --      52,924
Minnesota..............................  Brooklyn Park          Minneapolis/St. Paul         127,480          --
                                         Eagan                  Minneapolis/St. Paul         210,468          --
Missouri...............................  Kansas City            Kansas City                       --      95,205
New Jersey.............................  Edison                 New York                     257,579     133,177
                                         Edison                 New York                          --      44,855
                                         Pennsauken             Philadelphia                 231,000      25,316
New York...............................  Coxsackie              Albany                       256,000          --
</TABLE>
 
                                       58
<PAGE>
<TABLE>
<CAPTION>
                                                                                            APPROX. SQUARE FEET
                                                                      METROPOLITAN         ----------------------
STATE                                            CITY                  AREA SERVED           OWNED      LEASED
- ---------------------------------------  ---------------------  -------------------------  ---------  -----------
<S>                                      <C>                    <C>                        <C>        <C>
North Carolina.........................  Charlotte              Charlotte                         --      24,800
                                         Charlotte              Charlotte                    104,000      67,183
Ohio...................................  Cincinnati             Cincinnati                   108,778          --
                                         Columbus               Columbus                          --     171,665
                                         Twinsburg              Cleveland                    206,136     136,966
                                         Valley View            Cleveland                         --      28,000
Oklahoma...............................  Tulsa                  Tulsa                         52,600      22,500
Oregon.................................  Portland               Portland                          --      91,603
Pennsylvania...........................  Pittsburgh             Pittsburgh                        --      84,176
Tennessee..............................  Memphis                Memphis                           --      78,286
                                         Nashville              Nashville                         --      66,000
                                         Nashville              Nashville                         --      59,250
                                         Nashville(2)           Nashville                         --     191,250
Texas..................................  Dallas(1)              Dallas/Fort Worth            223,230     159,864
                                         Dallas                 Dallas                            --      72,000
                                         Houston                Houston                           --     143,859
                                         Houston                Houston                           --      24,600
                                         Houston                Houston                           --      69,500
                                         Lubbock                Lubbock                           --      58,725
                                         San Antonio            San Antonio                       --      63,098
                                         San Antonio            San Antonio                       --      31,750
Utah...................................  Salt Lake City         Salt Lake City                    --     101,324
Washington.............................  Kent                   Seattle                           --      24,000
                                         Tukwila                Seattle                           --     144,031
Wisconsin..............................  Milwaukee              Milwaukee                     67,300          --
</TABLE>
 
- ------------------------
 
(1) A portion of such property is subleased to a third party.
 
(2) This new facility is expected to replace the other two existing Nashville
    facilities before the end of 1998.
 
AZERTY BUSINESS LEASED FACILITIES:
 
<TABLE>
<CAPTION>
                                                                                                      APPROXIMATE
STATE/COUNTRY                                                      CITY                USE            SQUARE FEET
- -----------------------------------------------------------  ----------------  --------------------  -------------
<S>                                                          <C>               <C>                   <C>
California.................................................  Visalia           Warehouse                  30,000
Florida....................................................  Miami             Warehouse                  25,000
                                                                               Call Center                 3,200
Indiana....................................................  Fort Wayne        Warehouse                  75,000
Mexico.....................................................  Mexico City       Office/Warehouse           12,800
Pennsylvania...............................................  Chambersburg      Warehouse                  65,000
</TABLE>
 
    Substantially all property rights of the Company are pledged to secure its
obligations under the New Credit Agreement. See "Description of Certain
Indebtedness--New Credit Facilities."
 
                                       59
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
    Set forth below is certain information, as of June 10, 1998, with respect to
those individuals who are serving as members of the Board of Directors of the
Company or as executive officers of the Company.
 
<TABLE>
<CAPTION>
NAME                                                       AGE                           POSITION
- ------------------------------------------------------     ---     ----------------------------------------------------
<S>                                                     <C>        <C>
Frederick B. Hegi, Jr.................................     54      Chairman of the Board
Randall W. Larrimore..................................     51      Director; President and Chief Executive Officer
Daniel H. Bushell.....................................     46      Executive Vice President, Chief Financial Officer
                                                                   and Assistant Secretary
Michael D. Rowsey.....................................     45      Director; Executive Vice President
Steven R. Schwarz.....................................     44      Executive Vice President
Kathleen S. Dvorak....................................     41      Vice President, Investor Relations
Mark J. Hampton.......................................     44      Vice President, Marketing
R. Thomas Helton......................................     50      Vice President, Human Resources
James A. Pribel.......................................     44      Treasurer and Secretary
Albert H. Shaw........................................     48      Vice President, Operations
Ergin Uskup...........................................     60      Vice President, Management Information Systems and
                                                                   Chief Information Officer
Gary G. Miller........................................     48      Director
Daniel J. Good........................................     58      Director
James A. Johnson......................................     44      Director
Joel D. Spungin.......................................     60      Director
Benson P. Shapiro.....................................     56      Director
Roy W. Haley..........................................     51      Director
</TABLE>
 
    Set forth below is a description of the backgrounds of the directors and
executive officers of the Company. There is no family relationship between any
director or executive officer of the Company. Officers of the Company are
elected by the Board of Directors and hold office until their respective
successors are duly elected and qualified.
 
    FREDERICK B. HEGI, JR. was elected to the Board of Directors upon
consummation of the Merger and served as Chairman, interim President and Chief
Executive Officer upon the resignation of Thomas W. Sturgess in November 1996
and until Randall Larrimore became President and Chief Executive Officer in May
1997. Prior to the Merger, he had been a director of Associated since 1992. Mr.
Hegi is a general partner of various Wingate entities, including the indirect
general partner of each of Wingate Partners and Wingate II. Since May 1982, Mr.
Hegi has served as President of Valley View Capital Corporation, a private
investment firm. Mr. Hegi also currently serves as Chairman of the Executive
Committee of the Board of Loomis, Fargo & Co., an armored car service company;
Chairman of Tahoka First Bancorp, Inc., a bank holding company; and Chairman of
Cedar Creek Bancshares, Inc., a bank holding company. Additionally, he is a
director of Lone Star Technologies, Inc., a diversified company engaged in the
manufacture of tubular products; and Cattle Resources, Inc., a manufacturer of
animal feeds and operator of commercial cattle feedlots.
 
    RANDALL W. LARRIMORE was elected to the Board of Directors and became
President and Chief Executive Officer of the Company on May 23, 1997. From
February 1988 to May 1997, Mr. Larrimore had been President and Chief Executive
Officer of MasterBrand Industries, Inc., a manufacturer of leading brands
including Master Lock-Registered Trademark- padlocks and
Moen-Registered Trademark- faucets, and a subsidiary of Fortune Brands (formerly
American Brands). Prior to that time, Mr. Larrimore was President and Chief
Executive Officer of
 
                                       60
<PAGE>
Twentieth Century Companies, a manufacturer of plumbing repair parts and a
division of Beatrice Foods. Prior thereto he was Vice President of Marketing for
Beatrice Home Specialties, the operating parent of Twentieth Century. Fortune
Brands acquired Twentieth Century Companies and other Beatrice divisions and
subsidiaries in 1988. Before joining Beatrice in 1983, Mr. Larrimore was with
Richardson-Vicks, McKinsey & Company and then with PepsiCo International. Mr.
Larrimore serves as a director of Olin Corporation, a diversified manufacturer
of chemicals, metals, micro-electronic materials and sporting ammunition.
 
    DANIEL H. BUSHELL became Executive Vice President and Chief Financial
Officer of the Company upon consummation of the Merger. Mr. Bushell has served
as Assistant Secretary of the Company since January 1996, and served as
Secretary of the Company from June 1995 through such date. Mr. Bushell also
served as Assistant Secretary of the Company from the consummation of the Merger
until June 1995. Prior thereto, Mr. Bushell had been Chief Administrative and
Chief Financial Officer of Associated and ASI since January 1992. From 1978 to
January 1992, Mr. Bushell served in various capacities with ACE Hardware
Corporation, most recently as Vice President of Finance.
 
    MICHAEL D. ROWSEY was elected to the Board of Directors upon consummation of
the Merger and became Executive Vice President of the Company upon consummation
of the Merger with primary responsibility for field operations. Prior to the
Merger, Mr. Rowsey had been a director of Associated since 1992 and President
and Chief Operating Officer of Associated since January 1992. From 1979 to
January 1992, Mr. Rowsey served in various capacities with Boise Cascade Office
Products, most recently as the North Regional Manager.
 
    STEVEN R. SCHWARZ became Executive Vice President of the Company upon
consummation of the Merger with primary responsibility for marketing and
merchandising. Prior thereto, he was Senior Vice President, Marketing of the
Company since June 1992 and had previously been Senior Vice President, General
Manager, Micro United since 1990 and Vice President, General Manager, Micro
United since September 1989. He had held a staff position in the same capacity
since February 1987.
 
    KATHLEEN S. DVORAK became Vice President, Investor Relations of the Company
in July 1997. Ms. Dvorak began her career at the Company in 1982 and has held
various positions with increasing responsibility within the investor relations
function. Most recently, she was Director of Investor Relations of the Company.
 
    MARK J. HAMPTON has served as Vice President of Marketing of the Company
since September 1994. Mr. Hampton began his career at the Company in 1980 and
held various positions in the sales and marketing area. In 1991, Mr. Hampton
left the Company to pursue an opportunity to work in the dealer community and
was the primary architect in developing a successful national buying and
marketing group. After rejoining the Company in September 1992, he was made a
Regional Vice President in charge of the Midwest Region and then Vice President
and General Manager of Micro United.
 
    R. THOMAS HELTON became Vice President of Human Resources of the Company in
February 1998. Prior to joining the Company, Mr. Helton spent 11 years, from
1986 to 1997, at Whirlpool Corporation where he held a variety of management and
executive positions within the human resources function. Most recently, he was
Vice President of Human Resources for Whirlpool Asia. From 1980 to 1986, Mr.
Helton was with Kaiser Aluminum and Chemical working in personnel and labor
relations.
 
    JAMES A. PRIBEL became Treasurer of the Company in 1992 and Secretary in
1998. Mr. Pribel previously had been Assistant Treasurer of the Company since
1984 and had served in various positions since joining the Company in 1978.
 
    ALBERT H. SHAW became Vice President, Operations of the Company shortly
after consummation of the Merger. Prior thereto, he was Vice President, Midwest
Region of the Company since March 1994. He had
 
                                       61
<PAGE>
been a Vice President of the Company since 1992 and prior to that had served in
various management positions since joining the Company in 1974.
 
    ERGIN USKUP became Vice President, Management Information Systems and Chief
Information Officer of the Company in February 1994. Prior thereto, since 1987,
Mr. Uskup had been Vice President, Corporate Information Services for Baxter
International Inc., a global manufacturer and distributor of health care
products.
 
    GARY G. MILLER was elected to the Board of Directors upon consummation of
the Merger. Mr. Miller served as Vice President and Secretary of the Company
from consummation of the Merger until June 27, 1995, and Assistant Secretary of
the Company from June 27, 1995 to May 8, 1996. Prior thereto, Mr. Miller had
been a director of Associated since 1992 and Vice President and Secretary of
Associated since January 1992. Mr. Miller also currently serves as President of
Cumberland, a private investment firm which is located in Fort Worth, Texas. In
addition, from 1977 to December 1993, Mr. Miller served as Executive Vice
President, Chief Financial Officer and a director of AFG Industries, Inc., and
its parent company, Clarity Holdings Corp. He is Chairman of the Board of both
CFData Corp., a nationwide provider of check collection and check verification
services, and Fore Star Golf, Inc., which was formed in 1993 to own and operate
golf course facilities.
 
    DANIEL J. GOOD was elected to the Board of Directors upon consummation of
the Merger. Prior to the Merger, he had been a director of Associated since
1992. Mr. Good is Chairman of Good Capital Co., Inc. ("Good Capital"), an
investment firm in Lake Forest, Illinois. Until June 1995, Mr. Good was Vice
Chairman of Golden Cat Corp., the largest producer of cat litter in the United
States, and prior thereto he was Managing Director of Merchant Banking for
Shearson Lehman Bros. and President of A.G. Becker Paribas, Inc. Mr. Good serves
as a director of Supercuts, Inc.
 
    JAMES A. JOHNSON was elected to the Board of Directors upon consummation of
the Merger. Prior to the Merger, he had been a director of Associated since
1992. Mr. Johnson is a general partner of various Wingate entities, including
the indirect general partner of Wingate II. From 1980 until he joined Wingate
Partners in 1990, Mr. Johnson served as a Principal of Booz-Allen & Hamilton, an
international management consulting firm. Mr. Johnson currently serves as a
director of Century Products Company, a manufacturer and distributor of baby
seats and other juvenile products.
 
    JOEL D. SPUNGIN has served as a member of the Board of Directors since 1972
and prior to the consummation of the Merger was Chairman of the Board of
Directors and Chief Executive Officer of the Company since August 1988. From
October 1989 until April 1991, he was also President of the Company. Prior to
that, since March 1987, Mr. Spungin was Vice Chairman of the Board and Chief
Executive Officer of the Company. Previously, since August 1981, Mr. Spungin was
President and Chief Operating Officer of the Company. He also serves as a
general partner of DMS Enterprises, L.P., a management advisory and investment
partnership, and as a director of AAR Corp., an aviation and aerospace company,
and Home Products International, Inc., a manufacturer of home improvement
products.
 
    BENSON P. SHAPIRO was elected to the Board of Directors in November 1997.
Professor Shapiro has served on the faculty of Harvard University for 27 years
and until July 1997 was THE MALCOLM P. MCNAIR PROFESSOR OF MARKETING at the
Harvard Business School. He continues to teach a variety of Harvard's executive
programs and spends much of his time on research, writing and consulting.
 
    ROY W. HALEY was elected to the Board of Directors in March 1998. Mr. Haley
currently serves as President and Chief Executive Officer of WESCO Distribution,
Inc. ("WESCO"). Prior to joining WESCO in 1994, he served as President and Chief
Operating Officer of American General Corporation, one of the nation's largest
consumer financial services organizations. Mr. Haley also serves as a director
for the National Association of Wholesalers and The National Association of
Electrical Distribution Education Foundation.
 
                                       62
<PAGE>
COMPOSITION OF THE BOARD OF DIRECTORS
 
    The Company's Restated Certificate of Incorporation (as amended from time to
time, the "Charter") provides that the Board of Directors shall be divided into
three classes, each class as nearly equal in number as possible, and each term
consisting of three years. The directors currently in each class are as follows:
Class I (having terms expiring in 1999)--Messrs. Good, Johnson and Spungin;
Class II (having terms expiring in 2000)--Messrs. Hegi, Miller and Rowsey; and
Class III (having terms expiring in 2001)-- Messrs. Larrimore, Shapiro and
Haley.
 
                                       63
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
    The following table sets forth information as of June 10, 1998 with respect
to the beneficial ownership of Common Stock by (i) each person who is known by
the Company to own beneficially more than five percent of the Company's Common
Stock, (ii) the Company's directors and named executive officers, (iii) all
directors and executive officers as a group and (iv) the other Selling
Stockholders.
 
<TABLE>
<CAPTION>
                                             SHARES BENEFICIALLY
                                                 OWNED BEFORE                             SHARES BENEFICIALLY OWNED
                                                 OFFERING(1)                                  AFTER OFFERING(1)         SHARES AND
                                          --------------------------                      --------------------------   OPTIONS HELD
                                            NUMBER OF     PERCENT OF     SHARES TO BE       NUMBER OF     PERCENT OF      AFTER
                                             SHARES         CLASS      SOLD IN OFFERING      SHARES         CLASS      OFFERING(2)
                                          -------------   ----------   ----------------   -------------   ----------   ------------
<S>                                       <C>             <C>          <C>                <C>             <C>          <C>
5% STOCKHOLDERS:
Wingate Partners, L.P. .................  3,210,380(3)      19.8%         --              3,210,380         17.7%       3,210,380
  750 N. St. Paul St.
  Suite 1200
  Dallas, Texas 75201
 
DIRECTORS AND NAMED EXECUTIVE OFFICERS:
Good, Daniel J. ........................     76,180(4)      *             --                 76,180         *              91,180
Haley, Roy W. ..........................     --             --            --                 --             --             15,000
Hegi, Frederick B., Jr. ................     91,906(5)      *             --                 91,906         *             106,906
Johnson, James A. ......................     24,279(6)      *             --                 24,279         *              39,279
Larrimore, Randall W. ..................     50,000(7)      *             --                 50,000         *             285,000
Miller, Gary G..........................     --    (8)      --            --                 --             --             15,000
Rowsey, Michael D. .....................    150,032(9)      *             34,210(10)        100,032(11)     *             115,032
Shapiro, Benson P. .....................     --             --            --                 --             --             15,000
Spungin, Joel D. .......................     18,520         *             --                 18,520         *              33,520
Bushell, Daniel H. .....................    224,148(12)      1.4%        102,112(10)         85,000(11)     *             100,000
Schwarz, Steven R. .....................    120,628(13)     *             80,515(10)         15,628(11)     *              30,628
Uskup, Ergin............................     60,126(14)     *             40,787(10)          7,626(11)     *              13,626
All Directors and Executive Officers as
  a group (17 persons)..................    861,411(15)      5.1%        288,790(10)        483,597(11)      2.6%         925,097
 
OTHER SELLING STOCKHOLDERS:
Ashley, Oran............................      6,311         *              2,300              4,011         *               6,511
Berg, Ronald C..........................     10,287         *              4,000              6,287         *               8,787
Eberspacher, Robert W. .................     96,000         *              5,297(10)         88,500(11)     *              94,500
Feldman, Stanley W. ....................     60,000         *             44,154(10)         --    (11)     --              6,000
Hampton, Mark J. .......................     15,166         *             14,166              1,000         *               7,000
Howard, Jeffrey G. .....................     37,500         *              2,330(10)         34,500(11)     *              37,000
Kennedy, John D. .......................     24,965         *             20,000              4,965         *              10,965
Kravitz, Randy C. ......................      6,856         *              1,750              5,106         *               7,606
Micallef, Linda C. .....................     30,052         *             10,417(10)         16,302(11)     *              18,802
Miller, Lawrence E. ....................     51,857         *             21,857(10)         30,000(11)     --             32,500
Shaw, Albert H. ........................     20,429         *             17,000              3,429         *               9,429
Sturgess, Thomas W. ....................    176,933(16)      1.1%         99,612(10)         51,933(11)     *              51,933
Templet, Joseph R. .....................     19,500         *              5,000             14,500         *              20,500
</TABLE>
 
- --------------------------
 
   * Represents less than 1.0%.
 
 (1) For purposes of calculating the beneficial ownership of each stockholder,
     it was assumed (in accordance with the Commission's definition of
     "beneficial ownership") that such stockholder had exercised all options,
     conversion rights or warrants by which such stockholder had the right
     within 60 days following June 10, 1998, to acquire shares of such class of
     stock.
 
 (2) Includes all shares beneficially owned by the named individual and all
     options not exercisable within 60 days of June 10, 1998.
 
                                       64
<PAGE>
 (3) Includes (i) 2,422,620 shares owned by Wingate Partners, (ii) 782,780
     shares owned by Wingate II, (iii) 4,340 shares owned by Wingate Management
     Corporation, and (iv) 640 shares owned by Wingate Management Limited,
     L.L.C.
 
 (4) Does not include 363,899 shares owned by Good Capital. Mr. Good is Chairman
     and a controlling stockholder of Good Capital and, accordingly, may be
     deemed to beneficially own the shares owned of record by Good Capital.
 
 (5) Includes (i) 46,328 shares owned by Mr. Hegi, (ii) 134 shares held of
     record by a family company of which he is managing partner, (iii) 23,853
     shares held in trust for his benefit and for which he serves as trustee,
     and (iv) 21,591 shares held in trusts for unrelated third parties of which
     he is trustee. Does not include (i) 2,422,620 shares held by Wingate
     Partners, (ii) 782,780 shares held by Wingate II, (iii) 4,340 shares held
     by Wingate Management Corporation and (iv) 640 shares held by Wingate
     Management Limited, L.L.C. Mr. Hegi is an indirect general partner of each
     of Wingate Partners and Wingate II, President of Wingate Management
     Corporation, and a manager of Wingate Management Limited, L.L.C. and
     accordingly, may be deemed to beneficially own the shares owned of record
     by these entities. See Note (1) above and "Management."
 
 (6) Includes 18,477 shares owned by Mr. Johnson and 5,802 shares held in a
     self-directed individual retirement account for the benefit of Mr. Johnson.
     Does not include (i) 782,780 shares held by Wingate II and (ii) 640 shares
     held by Wingate Management Limited, L.L.C. Mr. Johnson is an indirect
     general partner of Wingate II and a manager of Wingate Management Limited,
     L.L.C. and, accordingly, may be deemed to beneficially own the shares owned
     of record by these entities. See Note (1) above and "Management."
 
 (7) Includes 50,000 shares issuable upon exercise of employee stock options.
 
 (8) Does not include (i) 338,084 shares owned by Cumberland and (ii) Warrants
     exercisable for 1,547 shares held by ASI Partners III, L.P. (of which
     Cumberland serves as general partner). Mr. Miller is President and
     stockholder of Cumberland and, accordingly, may be deemed to beneficially
     own the shares and Warrants owned of record by Cumberland and ASI Partners
     III, L.P.
 
 (9) Includes (i) 9,318 shares owned by Mr. Rowsey and (ii) 140,714 shares
     issuable upon exercise of employee stock options.
 
 (10) Includes shares of Common Stock to be sold hereunder to satisfy the
      exercise price of certain Employee Stock Options exercised by certain
      Selling Stockholders, but excludes shares of Common Stock to be withheld
      by the Company in partial satisfaction of the potential tax liability
      related to the exercise of Employee Stock Options in connection with this
      Offering.
 
 (11) Gives effect to the sale of all shares of Common Stock to be sold by
      certain Selling Stockholders and the withholding of shares of Common Stock
      by the Company in partial satisfaction of the potential tax liability
      related to the exercise of Employee Stock Options in connection with this
      Offering.
 
 (12) Includes (i) 14,949 shares owned by Mr. Bushell and (ii) 209,199 shares
      issuable upon exercise of employee stock options.
 
 (13) Includes (i) 628 shares owned by Mr. Schwarz and (ii) 120,000 shares
      issuable upon exercise of employee stock options.
 
 (14) Includes (i) 126 shares owned by Mr. Uskup and (ii) 60,000 shares issuable
      upon exercise of employee stock options.
 
 (15) Includes all securities beneficially owned by the current directors and
      executive officers of United and USSC, including an aggregate of (i)
      281,498 shares of Common Stock and (ii) 579,913 shares issuable upon
      exercise of employee stock options.
 
 (16) Includes 16,933 shares held in an individual retirement trust account and
      Employee Stock Options to purchase 160,000 shares of Common Stock. Does
      not include (i) 2,422,620 Shares of Common Stock owned by Wingate
      Partners, and (ii) 4,340 shares of Common Stock owned by Wingate
      Management Corporation. Mr. Sturgess is a general partner of Wingate
      Management Company, L.P., the managing general partner of Wingate Partners
      and an officer of Wingate Management Corporation and, accordingly, may be
      deemed to beneficially own shares of Common Stock owned by such entities.
 
                                       65
<PAGE>
CERTAIN RELATIONSHIPS BETWEEN THE COMPANY AND SELLING STOCKHOLDERS
 
    In connection with the employment of certain persons by the Company (the
"Optionees"), the Company granted the Optionees certain Employee Stock Options
(the "Selling Stockholder Options"). The Selling Stockholder Options are
currently exercisable in whole or in part and the Optionees presently have the
right to sell all or part of the Common Stock received upon exercise of the
Selling Stockholder Options and all other shares of Common Stock owned by them.
To facilitate the orderly distribution of the Common Stock held or to be held by
the Optionees, the Optionees and the Company have entered into an Agreement to
Sell (the "Agreement to Sell"), by which the Optionees have agreed to sell their
Common Stock exclusively by means of this Offering, refrain from disposing of
their Common Stock until the closing of the Offering and enter into a lock-up
agreement with the Underwriters pursuant to which the Optionees will agree not
to dispose of any Common Stock for 60 days after the closing of the Offering. In
consideration of this Agreement to Sell, the Company will reimburse the Optionee
an amount equal to (i) the underwriting discount and commission paid by the
Optionee in respect of the sale of Common Stock, less (ii) the product of (A)
the number of shares of Common Stock sold by the Optionee and (B) an amount per
share representing the standard commission that would otherwise have been
charged to the Optionee in connection with the sale of Optionee's shares of
Common Stock. The aggregate amount expected to be reimbursed by the Company to
the Optionee pursuant to the terms of this Agreement to Sell as a result of this
Offering is $1.1 million. All Selling Stockholders are parties to the Agreement
to Sell.
 
    As a result of United's redemption of all of its outstanding Series A
Preferred Stock effected on September 2, 1997, Messrs. Rowsey, L. Miller and
Eberspacher each received $92,166 in aggregate proceeds from such redemption.
 
    United has granted to Messrs. Rowsey, Eberspacher, Bushell, Kennedy and L.
Miller Employee Stock Options exercisable for an aggregate of (i) 94,506,
70,390, 89,199, 6,937 and 59,740 shares, respectively, at an exercise price of
$1.45 per share (which were granted in 1992 and 1996 in connection with the
Associated transaction, with the exception of Mr. Kennedy whose Employee Stock
Options were granted in 1996); (ii) 15,000, 7,500, 15,000, 7,500 and 3,750
shares, respectively, at an exercise price of $5.12 per share; and (iii)
105,000, 52,500, 105,000, 52,500 and 26,250 shares, respectively, at an exercise
price of $16.875 per share. United has also granted Employee Stock Options to
Messrs. Schwarz, Uskup, Feldman, Howard, Ashley, Berg, Hampton, Kravitz, Shaw
and Templet and Ms. Micallef exercisable for an aggregate of (i) 15,000, 7,500,
7,500, 3,750, 2,500, 3,750, 3,750, 2,500, 7,500, 7,500 and 3,750 shares,
respectively, at an exercise price of $5.12 per share and (ii) 105,000, 52,500,
52,500, 33,750, 17,500, 26,250, 33,750, 17,500, 52,500, 52,500 and 26,250
shares, respectively, at an exercise price of $16.875 per share.
 
    Additionally, on January 28, 1998, Messrs. Rowsey, Bushell, Schwarz, Uskup,
Ashley, Berg, Eberspacher, Feldman, Hampton, Howard, Kennedy, Kravitz, L.
Miller, Shaw and Templet and Ms. Micallef were granted options for 15,000,
15,000, 15,000, 6,000, 2,500, 2,500, 6,000, 6,000, 6,000, 2,500, 6,000, 2,500,
2,500, 6,000, 6,000, and 2,500 respectively, at an exercise price of $46.75,
under the Management Equity Plan. All such options vest in 20% increments on
each anniversary of the grant, except that vesting may be accelerated on the
third or fourth anniversary of the grant if the stock price has increased by at
least a 15% compounded annual growth rate.
 
    Effective January 1, 1996, United granted to Mr. Sturgess, the Company's
former Chairman, President and Chief Executive Officer, in consideration of
services rendered in such capacity (i) options exercisable for an aggregate of
240,000 shares of Common Stock at an exercise price of $16.875 per share and
(ii) options exercisable for an aggregate of 120,000 shares of Common Stock at
an exercise price of $5.12 per share. In November 1996, in connection with the
resignation of Mr. Sturgess as Chairman, President and Chief Executive Officer
of the Company, United and Mr. Sturgess entered into a termination agreement
whereby Mr. Sturgess retained options currently exercisable for an aggregate of
160,000 shares of Common Stock at an exercise price of $16.875 per share.
 
                                       66
<PAGE>
    In July 1997, in connection with the negotiation of the executive vice
president employment agreements discussed below, United and each of Messrs.
Rowsey, Bushell and Schwarz entered into amendments to their respective stock
option agreements under United's Management Equity Plan. The amendments revised
the terms of exercisability of such options following a termination of such
employee without Cause or such employee's termination for Good Reason (each as
defined in such employee's respective employment agreement).
 
    Effective as of June 1, 1997, the Company entered into new employment
agreements with Messrs. Bushell, Rowsey and Schwarz. Pursuant to such
agreements, the term of employment began on June 1, 1997 and continues until the
executive or the Company notifies the other party. If the executive notifies the
Company, the term of employment ends 90 days after such notification, and if the
Company notifies the executive, the term of employment ends at the later of (i)
June 1, 2000 or (ii) two years after such notification. The term of employment
may also be terminated earlier by either the executive or the Company. The
agreements provide for an annual base salary of at least $265,000, plus
participation in all bonus, stock option and other benefit plans generally
available to executive officers of the Company.
 
    If the executive's employment is terminated due to death or disability, he
generally is entitled to an amount equal to the sum of his annual base salary
and his previous year's annual incentive compensation award payable over a
12-month period. If the executive's employment is terminated by the Company
without Cause or by him for Good Reason, he generally is entitled to a severance
amount (subject to mitigation) equal to the sum of his base salary and bonuses
for the months remaining in the term of employment (or which would have been
remaining in the term of employment if the Company had given notice on the
termination date) payable over the severance period, and continued welfare
benefit coverage over such severance period. If the executive's employment is
terminated for any reason other than for Cause, the Company will allow the
executive, his spouse, and his eligible dependents to participate in the
Company's health plan for a specified period, subject to certain limitations on
nonemployee participation and subject to the executive (or his spouse or
dependents) paying for such coverage.
 
                                       67
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
    Upon completion of this Offering, the Company will have outstanding
18,124,923 shares of Common Stock. In addition, 1,548 shares of Common Stock
will be issuable upon exercise of outstanding Warrants and 1,283,489 shares will
be issuable upon exercise of Employee Stock Options, subject to the mandatory
redemption and cancellation of shares issuable upon exercise of certain Employee
Stock Options to satisfy tax withholding obligations. Of the shares of Common
Stock that will be outstanding after this Offering, 14,010,877 shares will be
freely tradable without restriction or further registration under the Securities
Act. All of the remaining 4,114,046 shares of Common Stock held by existing
stockholders and 1,548 shares issuable upon the exercise of Warrants will be
"restricted" securities within the meaning of the Securities Act as a result of
the issuance thereof in private transactions not involving a public offering.
The "restricted" securities may not be resold unless they are registered under
the Securities Act or are sold pursuant to an available exemption from
registration, including 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 shares for at least one
year (including the holding period of any prior owner except an "affiliate" (as
that term is defined in Rule 144)) is entitled to sell, within any three-month
period, a number of those shares that does not exceed the greater of (i) 1% of
the then outstanding shares of the Common Stock (181,249 shares immediately
after this Offering) or (ii) the average weekly trading volume in the Common
Stock during the four calendar weeks preceding the date on which notice of the
sale is filed with the Securities and Exchange Commission (the "Commission").
Sales under Rule 144 are also subject to certain manner of sale provisions,
notice requirements and requirements as to the availability of current public
information concerning the Company. Rule 144 provides that a person (or persons
whose shares are aggregated) who is not deemed to have been an affiliate of the
Company at any time during the 90 days preceding a sale, and who has
beneficially owned shares for at least two years (including, in certain
circumstances, the holding period of any prior owner) is entitled to sell those
shares under Rule 144(k) without regard to the limitations described above.
 
    After completion of the Offering and expiration of the 60-day lockup
agreement described below, all shares of Common Stock that are "restricted"
securities will be eligible for sale on the open market under Rule 144 (as
currently in effect), subject to the volume and manner of sales limitations
referred to above. Certain stockholders have been granted certain rights with
respect to registration under the Securities Act of shares of Common Stock held
by them.
 
    The Company's directors and certain executive officers, the Selling
Stockholders and certain other significant stockholders of the Company have
agreed that, for the period of up to 60 days following the date of this
Prospectus, each will not (i) directly or indirectly, offer to sell, contract to
sell or otherwise sell, dispose of, loan, pledge or grant any rights with
respect to (collectively, a "Disposition"), any shares of Common Stock, any
options or warrants to purchase any shares of Common Stock or any securities
convertible into or exchangeable for shares of Common Stock (collectively, the
"Securities"), now owned or hereafter acquired by such person or with respect to
which such person has or hereafter acquires the power of disposition, otherwise
than (a) the shares offered hereby by such persons, (b) as a bona fide gift or
gifts, provided the donee or donees thereof agree to be bound in writing by the
terms of the "lock-up" agreement, (c) as a distribution to limited partners or
stockholders of such person, provided that the distributees thereof agree in
writing to be bound by the terms of the "lock-up" agreement, or (d) with prior
written consent of the Representatives or (ii) make any demand for or exercise
any right with respect to the registration of any Securities. In addition, the
Company has agreed that, during the period of up to 60 days from the date of
this Prospectus, it will not, without the prior written consent of the
Representatives, either directly or indirectly, effect a Disposition with
respect to any Securities, other than the shares offered hereby and the
Company's issuance of Common Stock upon exercise of Employee Stock Options.
 
    The Company can make no prediction as to the effect, if any, that sales of
shares or the availability of shares for sale will have on the market price for
the Common Stock prevailing from time to time. Nevertheless, sales of
substantial amounts of Common Stock in the public market could adversely affect
prevailing market prices. See "Risk Factors--Impact of Shares Eligible for
Future Sale."
 
                                       68
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The authorized capital stock of the Company consists of 46,500,000 shares,
consisting of (i) 1,500,000 shares of a class designated as preferred stock,
$0.01 par value ("preferred stock"), (ii) 40,000,000 shares of Common Stock, and
(iii) 5,000,000 shares of Nonvoting Common Stock. Of the authorized shares of
capital stock, 16,220,438 shares of Common Stock, no shares of Nonvoting Common
Stock and no shares of preferred stock were outstanding as of June 10, 1998. In
addition, Employee Stock Options exercisable for an aggregate of 1,824,438
shares of Common Stock and Warrants exercisable for an aggregate of 1,548 shares
of Common Stock were outstanding as of such date.
 
COMMON STOCK AND NONVOTING COMMON STOCK
 
    Holders of shares of Common Stock and Nonvoting Common Stock are entitled to
share ratably in such dividends as may be declared by the Board of Directors and
paid by the Company out of funds legally available therefor, subject to prior
rights of outstanding shares of any preferred stock and certain restrictions
under agreements governing the Company's indebtedness. See "Common Stock Price
Range and Dividend Policy" and "Description of Indebtedness." In the event of
any dissolution, liquidation or winding up of the Company, holders of shares of
Common Stock and Nonvoting Common Stock are entitled to share ratably in assets
remaining after payment of all liabilities and liquidation preferences, if any.
 
    Except as otherwise required by law, the holders of Common Stock are
entitled to one vote per share on all matters voted on by stockholders,
including the election of directors. The holders of a majority of shares of
Common Stock represented at a meeting of stockholders can elect all of the
directors to be elected at such a meeting.
 
    Holders of shares of Common Stock have no preemptive, cumulative voting,
subscription, redemption or conversion rights. The currently outstanding shares
of Common Stock are fully paid and nonassessable, and the shares of Common Stock
to be outstanding upon completion of the Offering will be fully paid and
nonassessable. The rights, preferences and privileges of holders of Common Stock
are subject to the rights of any series of preferred stock which the Company may
issue in the future. Shares of Nonvoting Common Stock are entitled to all rights
granted to, and subject to all restrictions imposed on, shares of Common Stock,
other than the right to vote, except in certain limited circumstances. Subject
to certain restrictions, shares of Nonvoting Common Stock are convertible at any
time at the option of the holder thereof into shares of Common Stock for no
additional consideration.
 
PREFERRED STOCK
 
    The Company is authorized to issue 1,500,000 shares of preferred stock. The
Board of Directors of the Company, in its sole discretion, may designate and
issue one or more series of preferred stock from the authorized and unissued
shares of preferred stock. Subject to limitations imposed by law or the
Company's Charter, the Board of Directors is empowered to determine the
designation of and the number of shares constituting a series of preferred
stock, the dividend rate thereon, the terms and conditions of any voting and
conversion rights for the series, the amounts payable on the series upon
redemption or upon the liquidation, dissolution or winding-up of the Company,
the provisions of any sinking fund for the redemption or purchase of shares of
any series, and the preferences and relative rights among the series of
preferred stock. Such rights, preferences, privileges and limitations could
adversely affect the rights of holders of Common Stock. In addition, the Board
of Directors of the Company, subject to its fiduciary duties, may issue shares
of preferred stock in order to deter a takeover attempt. See "Risk Factors--
Possible Anti-Takeover Effects."
 
                                       69
<PAGE>
WARRANTS
 
    As of June 10, 1998, Warrants exercisable for an aggregate of 1,548 shares
of Common Stock were outstanding. The Warrants contain customary antidilution
provisions and are exercisable through January 31, 2002. The Warrants provide
the holders thereof with certain "tag along rights" which entitle such holders
to participate, on a pro rata basis, in certain sales of shares of Common Stock
by Wingate Partners, Cumberland, Good Capital or certain of their affiliates.
Pursuant to the Warrants, Wingate Partners has been granted certain "go along
rights" which are triggered (subject to certain exceptions) in the event (i)
Wingate Partners sells 100% of its equity interest in the Company in a private
offering, (ii) all or substantially all of the assets of the Company are sold
and the proceeds of such sale are distributed to the stockholders of the Company
or (iii) the Company participates in a merger or consolidation. In the event
Wingate Partners exercises its "go along rights" in connection with the
occurrence of one of the events described above, each holder of Warrants would
become obligated to sell all Warrants and shares of Common Stock held by such
holders in the applicable transaction and to vote all shares of Common Stock in
favor of such transaction.
 
    Pursuant to the terms of the Warrants, if at any time the Company does not
have securities registered under Section 12(b) or 12(g) of the Exchange Act and
is not required to file reports under Section 15(d) of the Exchange Act, the
holders of the Warrants will be entitled to preemptive rights with respect to
certain issuances of shares of Common Stock by the Company and to board
observation rights for meetings of the Boards of Directors of the Company and
its subsidiaries. The Warrants also contain certain covenants and agreements
with respect to, among other things, (i) transactions with affiliates (other
than certain specified transactions with Wingate Partners, Cumberland and Good
Capital), (ii) certain mergers, reorganizations, recapitalizations and other
events with respect to the shares of Common Stock, (iii) the repurchase or
redemption of shares of Common Stock, (iv) changes of the fiscal year of the
Company, (v) the taking of actions that would cause the Company or any
subsidiary of the Company to own less than 80% of any subsidiary of the Company,
except that the Company and each subsidiary of the Company may own a percentage
of the stock of any such subsidiary not lower than the percentage owned at the
effective time of the Merger, (vi) delivery of financial statements of the
Company, and (vii) indemnification.
 
SPECIAL PROVISIONS OF THE CHARTER AND BYLAWS
 
    The Charter and Bylaws provide include certain provisions that could have
anti-takeover effects. The provisions are intended to enhance the likelihood of
continuity and stability in the composition of, and in the policies formulated
by, the Board of Directors. These provisions are also intended to help ensure
that the Board of Directors, if confronted by an unsolicited proposal from a
third party that has acquired a block of stock of the Company, will have
sufficient time to review the proposal, to develop appropriate alternatives to
the proposal, and to act in what the Board of Directors believes to be the best
interests of the Company and its stockholders. The provisions of the Charter
described under "Classified Board of Directors" and "Vote Required for Certain
Business Combinations" below may not be amended or repealed unless approved by
holders of at least 80% of the voting power of the then outstanding Common
Stock. The following is a summary of the provisions of the Charter and Bylaws
and is qualified in its entirety by reference to such documents in their
respective forms filed as exhibits to the Registration Statement of which this
Prospectus forms a part.
 
    CLASSIFIED BOARD OF DIRECTORS.  The Charter provides for three classes of
directors, which serve staggered three-year terms and which shall be elected by
the holders of the Common Stock. Under certain circumstances, the classification
of directors has the effect of making it more difficult for stockholders to
change the composition of the Board of Directors in a relatively short period of
time. Given the current structure of the Company's Board of Directors, at least
two annual meetings of stockholders, instead of one, will generally be required
to effect a change in a majority of the Board of Directors at any time when the
Company has seven or more directors.
 
                                       70
<PAGE>
    VOTE REQUIRED FOR CERTAIN BUSINESS COMBINATIONS.  The Company is subject to
Section 203 of the Delaware General Corporation Law, as amended (the "DGCL"),
which prohibits a publicly held Delaware corporation from engaging in a
"business combination" with an "interested stockholder" for a period of three
years after the date of the transaction in which the person became an interested
stockholder, unless one of the following events occurs: (i) prior to the date of
the business combination, the transaction is approved by the board of directors
of the corporation; (ii) upon consummation of the transaction which resulted in
the stockholder becoming an interested stockholder, the interested stockholder
owns at least 85% of the outstanding voting stock; or (iii) on or after such
date the business combination is approved by the board and by the affirmative
vote of at least 66 2/3% of the outstanding voting stock which is not owned by
the interested stockholder. A "business combination" includes mergers, asset
sales and other transactions resulting in a financial benefit to the
stockholder. An "interested stockholder" for purposes of the DGCL is a person
who, together with affiliates and associates, owns (or within three years, did
own) 15% or more of the corporation's voting stock.
 
    In addition, the Charter provides that certain transactions involving an
"interested stockholder" require the affirmative vote of the holders of at least
80% of the voting power of the then outstanding Common Stock. Such transactions
include certain (i) mergers or consolidations of the Company, (ii) sales,
leases, pledges and similar transactions involving the Company's assets, (iii)
issuances or transfers of the Company's securities, (iv) adoptions of a plan of
liquidation or dissolution of the Company and (v) reclassifications and
recapitalizations of the Company. Such vote requirement is in addition to that
required by the DGCL as described in the preceding paragraph. An "interested
stockholder" for purposes of the Charter is a person who beneficially owns 20%
or more of the Company's voting stock or an affiliate of the Company who at any
time within the previous two years beneficially owned 20% or more of the
Company's voting stock. Wingate constitutes an "interested stockholder" for
purposes of both the DGCL and the Charter.
 
    LIMITATIONS ON DIRECTORS' LIABILITY.  The Charter provides that, to the
fullest extent permitted by Delaware law, no director shall be liable to the
Company or its stockholders for monetary damages for breach of fiduciary duty as
a director. By virtue of these provisions, a director of the Company is not
personally liable for monetary damages for a breach of such director's fiduciary
duty except for liability for (i) breach of the duty of loyalty to the Company
or to its stockholder, (ii) acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (iii) dividends or stock
repurchases or redemptions that are unlawful under the DGCL, and (iv) any
transaction from which such director receives an improper personal benefit. In
addition, the Charter provides that if the DGCL is amended to authorize the
further elimination or limitation of the liability of a director, then the
liability of the directors will be eliminated or limited to the fullest extent
permitted by the DGCL.
 
                                       71
<PAGE>
                      DESCRIPTION OF CERTAIN INDEBTEDNESS
 
NEW CREDIT FACILITIES
 
    On April 3, 1998, USSC entered into the New Credit Agreement with United as
guarantor, The Chase Manhattan Bank, as agent, and a group of banks and
financial institutions (including Chase, the "Senior Lenders"). The following is
a summary of the principal terms of the New Credit Agreement which summary does
not purport to be complete and is subject, and is qualified in its entirety by
reference to, all the provisions of the New Credit Agreement, as it may be
further amended from time to time, a copy of which is available upon request to
the Company. See "Available Information."
 
    The New Credit Agreement provided for the funding of the Azerty Acquisition,
the refinancing of certain existing indebtedness and for other general corporate
purposes of the Company and its subsidiaries. The New Credit Facilities under
the New Credit Agreement consist of $150.0 million of borrowings pursuant to the
Tranche A Term Loan Facility and commitments of up to $250.0 million of
revolving loan borrowings pursuant to the Revolving Credit Facility (including a
sublimit of $90.0 million under the Revolving Credit Facility for letters of
credit) of which approximately $20.0 million (excluding approximately $36.3
million of outstanding letters of credit under the Revolving Credit Facility) is
expected to be outstanding as of the date of the consummation of the Offering. A
portion of the Revolving Credit Facility is allocated for swingline loans. The
New Credit Facilities also included borrowings of $100.0 million under the
Tranche B Term Loan Facility. A substantial portion of the Tranche B Term Loan
Facility was repaid with the net proceeds from the Notes Offering. The remainder
of the Tranche B Term Loan Facility was permanently repaid with proceeds from
the sale of certain receivables. The net proceeds to the Company from the
Offering will be used to repay a portion of the indebtedness outstanding under
the Tranche A Term Loan Facility. See "Use of Proceeds." The repayment of
indebtedness under the Tranche A Term Loan Facility will result in a permanent
reduction in the amount borrowable thereunder.
 
    The loans under the Tranche A Term Loan Facility and the Revolving Credit
Facility generally bear interest as determined within a set range with the rate
based on the ratio of total debt (which excludes the face amount of any undrawn
letters of credit) of United and its subsidiaries to EBITDA (as defined in the
New Credit Agreement). The Tranche A Term Loan Facility and the Revolving Credit
Facility bear interest, at the option of the Company and based upon financial
performance, at the base rate (i.e., the higher of the prime rate or federal
funds plus 0.50%) plus 0% to 0.75% or LIBOR plus 1.00% to 2.00%.
 
    As of the date of this Prospectus, the outstanding principal balance of the
Tranche A Term Loan Facility consists of $150.0 million and matures on or about
March 31, 2004, and no amount of the Tranche B Term Loan Facility remained
outstanding, which had been scheduled to mature on or about December 31, 2004.
The term loans under the Tranche A Term Loan Facility are repayable in
consecutive quarterly installments commencing on or about June 30, 1998, the
first four of which are each in the amount of $2.5 million, the next four of
which are each in the amount of $3.75 million, the next four of which are each
in the amount of $6.25 million, the next four of which are each in the amount of
$7.5 million and the last eight of which are each in the amount of $8.75
million.
 
    Loans under the Tranche A Term Loan Facility and the Revolving Credit
Facility may be prepaid at any time, and are subject to certain mandatory
prepayments out of (i) net proceeds received from the issuance of equity by
United or any of its subsidiaries subject to certain exceptions provided in the
New Credit Agreement, (ii) net proceeds from certain asset sales in excess of
$15.0 million, (iii) 50% of USSC's Excess Cash Flow (as defined in the New
Credit Agreement) for any fiscal year (commencing with the fiscal year ending
December 31, 1998), but only if the Debt to Cash Flow Ratio (as defined in the
New Credit Agreement) as of the last day of the fiscal year is greater than 3.75
to 1, (iv) net proceeds received from casualty events subject to certain
exceptions provided within the New Credit Agreement and (v) net proceeds
received from certain debt issuances. Prepayments under the Tranche A Term Loan
Facility will be applied PRO RATA to the remaining installments due under the
Tranche A Term Loan Facility and, next, to
 
                                       72
<PAGE>
the permanent reduction of commitments (and the payment of loans outstanding)
under the Revolving Credit Facility.
 
    The Tranche A Term Loan Facility and the Revolving Credit Facility are
guaranteed, on a joint and several basis, by the Company and all of the direct
and indirect domestic subsidiaries of USSC.
 
    The Tranche A Term Loan Facility and the Revolving Credit Facility are
secured by perfected first priority pledges of the stock of USSC, all of the
stock of the domestic direct and indirect subsidiaries of USSC and certain of
the stock of all of the foreign direct and indirect subsidiaries (other than the
Receivables Company) of USSC and security interests in, and liens upon, certain
accounts receivable, inventory, contract rights and other personal and certain
real property of USSC and its domestic subsidiaries. The New Credit Agreement
provides for the complete release, upon request by USSC, of the liens upon
achievement of an investment grade rating from S&P or Moody's for the unsecured
long-term debt of United or USSC for any quarter, and a partial release in the
event the Leverage Ratio (as defined in the New Credit Agreement) is less than
or equal to 3 to 1. The Majority Lenders (as defined in the New Credit
Agreement) may request that the security interests be regranted if the Leverage
Ratio for any subsequent quarter exceeds 3 to 1. In addition, the New Credit
Agreement permits the release of the Senior Lenders' lien in connection with the
sale of specified receivables under the Receivables Securitization Program. See
"Recent Transactions--Receivables Securitization Program."
 
    The New Credit Agreement contains certain restrictive covenants that, among
other things, limit the ability of USSC and its subsidiaries to dispose of
assets, incur indebtedness or liens, pay dividends or make other payments in
respect of capital stock or subordinated indebtedness, make investments or other
acquisitions, engage in mergers or consolidations, engage in transactions with
affiliates, and engage in any business other than specified businesses. In
addition, the New Credit Agreement requires USSC to comply with certain
financial ratios and tests, including ratios of total debt to EBITDA, cash flow
to fixed charges, and EBITDA to interest expense, and a minimum net worth test.
 
    Defaults under the New Credit Agreement include, among other things, (i)
failure to pay principal when due; (ii) failure to pay interest within three
business days after the due date; (iii) default in the performance of certain
covenants and other obligations which, in some cases, continues for ten days;
(iv) default by the Company, USSC or any of its subsidiaries in respect of any
of its indebtedness above specified levels; (v) certain bankruptcy events; (vi)
certain judgments against USSC or any of its subsidiaries; (vii) the occurrence
of a change of control (as defined in the New Credit Agreement); and (viii) the
existence of certain environmental claims or liabilities.
 
12 3/4% NOTES
 
    The 12 3/4% Notes were originally issued on May 3, 1995 pursuant to the
12 3/4% Notes Indenture. As of the date hereof, the aggregate outstanding
principal amount of 12 3/4% Notes was $100.0 million. The 12 3/4% Notes are
unsecured senior subordinated obligations of USSC, and payment of the 12 3/4%
Notes is fully and unconditionally guaranteed by the Company and USSC's domestic
"restricted" subsidiaries on a senior subordinated basis. The 12 3/4% Notes
mature on May 1, 2005, and bear interest at the rate of 12 3/4% per annum,
payable semiannually on May 1 and November 1 of each year.
 
                                       73
<PAGE>
    In addition, the 12 3/4% Notes are redeemable at the option of USSC at any
time on or after May 1, 2000, in whole or in part, at the following redemption
prices (expressed as percentages of principal amount):
 
<TABLE>
<CAPTION>
                                                                                   REDEMPTION
YEAR BEGINNING MAY 1                                                                  PRICE
- ---------------------------------------------------------------------------------  -----------
<S>                                                                                <C>
2000.............................................................................     106.375%
2001.............................................................................     104.781%
2002.............................................................................     103.188%
2003.............................................................................     101.594%
</TABLE>
 
and thereafter at 100.0% of the principal amount, in each case together with
accrued and unpaid interest, if any, to the redemption date.
 
    Upon the occurrence of a change of control (which term includes the
acquisition by any person or group of more than 50% of the voting power of the
outstanding common stock of either the Company or USSC or certain significant
changes in the composition of the Board of Directors of either the Company or
USSC), USSC shall be obligated to offer to redeem all or a portion of each
holder's 12 3/4% Notes at 101% of the principal amount thereof, together with
accrued and unpaid interest, if any, to the date of such redemption. Such
obligation, if it arose, could have a material adverse effect on the Company.
 
    The 12 3/4% Notes Indenture governing the 12 3/4% Notes contains certain
covenants, including limitations on the incurrence of indebtedness, the making
of restricted payments, transactions with affiliates, the existence of liens,
disposition of proceeds of asset sales, the making of guarantees by restricted
subsidiaries, transfer and issuances of stock of subsidiaries, the imposition of
certain payment restrictions on restricted subsidiaries and certain mergers and
sales of assets.
 
8 3/8% NOTES
 
    The 8 3/8% Notes were issued on April 15, 1998 pursuant to the 8 3/8% Notes
Indenture. As of the date hereof, the aggregate outstanding principal amount of
8 3/8% Notes was $100.0 million. The 8 3/8% Notes are unsecured senior
subordinated obligations of USSC, and payment of the 8 3/8% Notes is fully and
unconditionally guaranteed by the Company and USSC's domestic subsidiaries that
incur Indebtedness (as defined in the 8 3/8% Notes Indenture) on a senior
subordinated basis. The 8 3/8% Notes mature on April 15, 2008, and bear interest
at the rate of 8 3/8% per annum, payable semiannually on April 15 and October 15
of each year.
 
    The 8 3/8% Notes Indenture provides that, prior to April 15, 2001, USSC may
redeem, at its option, up to 35% of the aggregate principal amount of the 8 3/8%
Notes within 180 days following one or more Public Equity Offerings (as defined
in the 8 3/8% Notes Indenture) with the net proceeds of such offerings at a
redemption price equal to 108.375% of the principal amount thereof, together
with accrued and unpaid interest and Additional Amounts (as defined in the
8 3/8% Notes Indenture), if any, to the date of redemption; provided that
immediately after giving effect to each such redemption, at least 65% of the
aggregate principal amount of the 8 3/8% Notes remain outstanding after giving
effect to such redemption.
 
    In addition, the 8 3/8% Notes are redeemable at the option of USSC at any
time on or after April 15, 2003, in whole or in part, at the following
redemption prices (expressed as percentages of principal amount):
 
<TABLE>
<CAPTION>
                                                                                   REDEMPTION
YEAR BEGINNING APRIL 15                                                               PRICE
- ---------------------------------------------------------------------------------  -----------
<S>                                                                                <C>
2003.............................................................................     104.188%
2004.............................................................................     102.792%
2005.............................................................................     101.396%
</TABLE>
 
                                       74
<PAGE>
and thereafter at 100.000% of the principal amount, in each case together with
accrued and unpaid interest, if any, to the redemption date.
 
    Upon the occurrence of a change of control (which term includes the
acquisition by any person or group of more than 50% of the voting power of the
outstanding common stock of either the Company or USSC or certain significant
changes in the composition of the Board of Directors of either the Company or
USSC), USSC shall be obligated to offer to redeem all or a portion of each
holder's 8 3/8% Notes at 101% of the principal amount thereof, together with
accrued and unpaid interest, if any, to the date of such redemption. Such
obligation, if it arose, could have a material adverse effect on the Company.
 
    The 8 3/8% Notes Indenture governing the 8 3/8% Notes contains certain
covenants, including limitations on the incurrence of indebtedness, the making
of restricted payments, transactions with affiliates, the existence of liens,
disposition of proceeds of asset sales, the making of guarantees by restricted
subsidiaries, transfer and issuances of stock of subsidiaries, the imposition of
certain payment restrictions on restricted subsidiaries and certain mergers and
sales of assets. In addition, the 8 3/8% Notes Indenture provides for the
issuance thereunder of up to $100.0 million aggregate principal amount of
additional 8 3/8% Notes having substantially identical terms and conditions to
the 8 3/8% Notes, subject to compliance with the covenants contained in the
8 3/8% Notes Indenture, including compliance with the restrictions contained in
the 8 3/8% Notes Indenture relating to incurrence of indebtedness.
 
                                       75
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions of the Underwriting Agreement, the
underwriters named below (the "Underwriters"), through their representatives,
Bear, Stearns & Co. Inc., Donaldson, Lufkin & Jenrette Securities Corporation,
Morgan Stanley & Co. Incorporated and Cleary Gull Reiland & McDevitt Inc. (the
"Representatives"), have severally agreed to purchase from the Company and the
Selling Stockholders the number of shares of Common Stock set forth opposite
their respective names below:
 
<TABLE>
<CAPTION>
UNDERWRITER                                                                            NUMBER OF SHARES
- -------------------------------------------------------------------------------------  -----------------
<S>                                                                                    <C>
Bear, Stearns & Co. Inc. ............................................................         537,507
Donaldson, Lufkin & Jenrette Securities Corporation..................................         537,000
Morgan Stanley & Co. Incorporated....................................................         537,000
Cleary Gull Reiland & McDevitt Inc. .................................................         179,000
Robert W. Baird & Co. Incorporated...................................................          43,000
Blackford Securities Corp............................................................          43,000
Credit Lyonnais Securities (USA) Inc.................................................          43,000
Friedman, Billings, Ramsey & Co., Inc................................................          43,000
Jefferies & Company..................................................................          43,000
                                                                                       -----------------
          Total......................................................................       2,005,507
                                                                                       -----------------
                                                                                       -----------------
</TABLE>
 
    The Underwriting Agreement provides that the obligations of the Underwriters
are subject to certain conditions precedent and that, if any of the foregoing
shares of Common Stock are purchased by the Underwriters pursuant to the
Underwriting Agreement, all such shares must be so purchased. The Company and,
to a limited extent, the Selling Stockholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act, or to contribute to payments that the Underwriters may be
required to make in respect thereof. The Underwriters have agreed to reimburse
the Company for certain expenses incurred by the Company in connection with the
Offering.
 
    The Company and the Selling Stockholders have been advised that the
Underwriters propose initially to offer the shares of Common Stock to the public
at the public offering price set forth on the cover page of this Prospectus and
to certain selected dealers (who may include the Underwriters) at such public
offering price less a concession not to exceed $1.37 per share. The selected
dealers may reallow a concession to certain other dealers not to exceed $0.10
per share. After the Offering to the public, the public offering price, the
concession to selected dealers and the reallowance to other dealers may be
changed by the Underwriters.
 
    In order to facilitate this Offering, certain persons participating in this
Offering may engage in transactions that stabilize, maintain or otherwise affect
the price of the Common Stock during and after this Offering. Specifically, the
Underwriters may over-allot or otherwise create a short position in the Common
Stock for their own account by selling more shares of Common Stock than have
been sold to them by the Company and the Selling Stockholders. The Underwriters
may elect to cover any such short position by purchasing shares of Common Stock
in the open market or by exercising the over-allotment option granted to the
Underwriters. In addition, such persons may stabilize or maintain the price of
the Common Stock by bidding for or purchasing shares of Common Stock in the open
market and may impose penalty bids, under which selling concessions allowed to
syndicate members or other broker-dealers participating in this Offering are
reclaimed if shares of Common Stock previously distributed in this Offering are
repurchased in connection with stabilization transactions or otherwise. The
effect of these transactions may be to stabilize or maintain the market price of
the Common Stock at a level above that which might otherwise prevail in the open
market. The imposition of a penalty bid may also affect the price of the Common
Stock to the extent that it discourages resales thereof. No representation is
made as to the
 
                                       76
<PAGE>
magnitude or effect of any such stabilization or other transactions. Such
transactions may be effected on the Nasdaq National Market or otherwise and, if
commenced, may be discontinued at any time.
 
    Certain persons participating in this Offering may also engage in passive
market making transactions in the Common Stock on the Nasdaq National Market in
accordance with Rule 103 of Regulation M under the Exchange Act. Rule 103
permits, upon the satisfaction of certain conditions, underwriting and selling
group members participating in a distribution that are also registered Nasdaq
market makers in the security being distributed (or a related security) to
engage in limited passive market making transactions during the period when
Regulation M would otherwise prohibit such activity. In general, a passive
market maker may not bid for or purchase a security at a price that exceeds the
highest independent bid for those securities by a person that is not
participating in the distribution and must identify its passive market making
bids on Nasdaq electronic inter-dealer reporting system. In addition, the net
daily purchases made by a passive market maker generally may not exceed 30% of
such market maker's average daily trading volume in the security for the two
full consecutive calendar months (or any 60 consecutive days ending within 10
days) immediately preceding the date of filing of the Registration Statement of
which this Prospectus forms a part.
 
    The Company has granted the Underwriters an option to purchase up to 300,826
additional shares of Common Stock at the public offering price less the
underwriting discounts and commissions set forth on the cover page of this
Prospectus, solely to cover over-allotments, if any. Such option may be
exercised at any time until 30 days after the date of this Prospectus. If the
Underwriters exercise such option, each of the Underwriters will be committed,
subject to certain conditions, to purchase a number of additional shares
proportionate to such Underwriter's initial commitment as indicated in the
preceding table.
 
    No action has been taken in any jurisdiction by the Company or the
Underwriters that would permit a public offering of the Common Stock offered
pursuant to the Offering in any jurisdiction where action for that purpose is
required, other than the United States. The distribution of this Prospectus and
the offering or sale of the shares of Common Stock offered hereby in certain
jurisdictions may be restricted by law. Accordingly, the shares of Common Stock
offered hereby may not be offered or sold, directly or indirectly, and neither
this Prospectus nor any other offering material or advertisements in connection
with the Common Stock may be distributed or published, in or from any
jurisdiction, except under circumstances that will result in compliance with
applicable rules and regulations of any such jurisdiction. Such restrictions may
be set out in applicable Prospectus supplements. Persons into whose possession
this Prospectus comes are required by the Company and the Underwriters to inform
themselves about and to observe any applicable restrictions. This Prospectus
does not constitute an offer of, or an invitation to subscribe for purchase of,
any shares of Common Stock and may not be used for the purpose of an offer to,
or solicitation by, anyone in any jurisdiction or in any circumstances in which
such offer or solicitation is not authorized or is unlawful.
 
    Each of the Company, its directors, certain executive officers, the Selling
Stockholders and certain other significant stockholders of the Company has
agreed that for a period of 60 days from the date of this Prospectus, it will
not, without prior written consent of the Representatives, issue, sell, offer or
agree to sell, grant any option for the sale, or otherwise dispose of, directly
or indirectly, any Common Stock or any securities substantially similar to the
Common Stock or any securities convertible into, exercisable for or exchangeable
for Common Stock or securities substantially similar to the Common Stock,
otherwise than in this Offering or upon the exercise of presently outstanding
stock options. See "Shares Eligible for Future Sale."
 
    Certain of the Underwriters have in the past provided, and may in the future
provide, investment banking services for the Company. In particular, Bear,
Stearns & Co. Inc., Morgan Stanley & Co. Incorporated and Cleary Gull Reiland &
McDevitt Inc. served as underwriters for the October Equity Offering. In
addition, Bear, Stearns & Co. Inc. acted as one of the initial purchasers in the
Notes Offering.
 
                                       77
<PAGE>
                                 LEGAL MATTERS
 
    Certain legal matters with respect to the Common Stock offered hereby will
be passed upon for the Company and certain Selling Stockholders by Weil, Gotshal
& Manges LLP, Dallas, Texas and New York, New York, and for the Underwriters by
Haynes and Boone, LLP, Dallas, Texas.
 
                                    EXPERTS
 
    The consolidated financial statements of the Company at December 31, 1996
and 1997, and for each of the three years in the period ended December 31, 1997,
appearing herein and incorporated by reference herein, have been audited by
Ernst & Young LLP, independent auditors, as set forth in their report thereon
appearing herein and incorporated by reference herein. Such consolidated
financial statements are included herein and are incorporated herein by
reference in reliance upon such report given upon the authority of such firm as
experts in accounting and auditing.
 
    With respect to the unaudited condensed consolidated interim financial
information for the three months ended March 31, 1997 and 1998, Ernst & Young
LLP have reported that they have applied limited procedures in accordance with
professional standards for a review of such information. However, their separate
report, included in the Company's Quarterly Report on Form 10-Q for the quarter
ended March 31, 1998 and incorporated herein by reference, states that they did
not audit and they do not express an opinion on that interim financial
information. Accordingly, the degree of reliance on their report on such
information should be restricted considering the limited nature of the review
procedures applied. The independent auditors are not subject to the liability
provisions of Section 11 of the Securities Act for their report on the unaudited
interim financial information because that report is not a "report" or a "part"
of the Registration Statement prepared or certified by the auditors within the
meaning of Sections 7 and 11 of the Securities Act.
 
                                       78
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                                                      <C>
UNITED STATIONERS INC. AND SUBSIDIARIES
  Report of Independent Auditors.......................................................        F-2
  Consolidated Balance Sheets as of December 31, 1996 and 1997.........................        F-3
  Consolidated Statements of Income for the Years Ended December 31, 1995, 1996 and
    1997...............................................................................        F-5
  Consolidated Statements of Changes in Stockholders' Equity for the Years Ended
    December 31, 1995, 1996 and 1997...................................................        F-6
  Consolidated Statements of Cash Flows for the Years Ended December 31, 1995, 1996 and
    1997...............................................................................        F-7
  Notes to Consolidated Financial Statements...........................................        F-8
 
  Condensed Consolidated Balance Sheets as of December 31, 1997 (audited) and March 31,
    1998 (unaudited)...................................................................       F-29
  Condensed Consolidated Statements of Income for the Three Months Ended March 31, 1997
    and 1998 (unaudited)...............................................................       F-30
  Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31,
    1997 and 1998 (unaudited)..........................................................       F-31
  Notes to Condensed Consolidated Financial Statements.................................       F-32
</TABLE>
 
                                      F-1
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Stockholders and Board of
 
Directors of United Stationers Inc.
 
    We have audited the accompanying consolidated balance sheets of United
Stationers Inc. and Subsidiaries as of December 31, 1997 and 1996 and the
related consolidated statements of income, changes in stockholders' equity and
cash flows for each of the three years in the period ended December 31, 1997.
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 consolidated financial position of United
Stationers Inc. and Subsidiaries at December 31, 1997 and 1996, and the
consolidated results of their operations and their cash flows for each of the
three years in the period ended December 31, 1997 in conformity with generally
accepted accounting principles.
 
                                          /s/ERNST & YOUNG LLP
 
Chicago, Illinois
January 27, 1998
 
                                      F-2
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                        AS OF DECEMBER 31,
                                                                       --------------------
                                                                         1996       1997
                                                                       ---------  ---------
<S>                                                                    <C>        <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents..........................................  $  10,619  $  12,367
  Accounts receivable, less allowance for doubtful accounts of $6,318
    in 1996 and $7,071 in 1997.......................................    291,401    311,920
  Inventories........................................................    463,239    511,555
  Other..............................................................     25,221     14,845
                                                                       ---------  ---------
TOTAL CURRENT ASSETS.................................................    790,480    850,687
PROPERTY, PLANT AND EQUIPMENT, AT COST
  Land...............................................................     21,878     21,857
  Buildings..........................................................    100,031    101,322
  Fixtures and equipment.............................................    102,092    113,037
  Leasehold improvements.............................................      1,040      1,026
                                                                       ---------  ---------
  Total property, plant and equipment................................    225,041    237,242
  Less--accumulated depreciation and amortization....................     51,266     72,699
                                                                       ---------  ---------
NET PROPERTY, PLANT AND EQUIPMENT....................................    173,775    164,543
GOODWILL.............................................................    115,449    111,852
OTHER................................................................     30,163     20,939
                                                                       ---------  ---------
TOTAL ASSETS.........................................................  $1,109,867 $1,148,021
                                                                       ---------  ---------
                                                                       ---------  ---------
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-3
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
                   (DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                        AS OF DECEMBER 31,
                                                                       --------------------
                                                                         1996       1997
                                                                       ---------  ---------
<S>                                                                    <C>        <C>
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES
  Current maturities of long-term debt...............................  $  46,923  $  44,267
  Accounts payable...................................................    238,124    236,475
  Accrued expenses...................................................     93,789    107,935
  Accrued income taxes...............................................      6,671     10,561
                                                                       ---------  ---------
TOTAL CURRENT LIABILITIES............................................    385,507    399,238
DEFERRED INCOME TAXES................................................     36,828     19,383
LONG-TERM DEBT.......................................................    552,613    492,868
OTHER LONG-TERM LIABILITIES..........................................     15,502     13,224
REDEEMABLE PREFERRED STOCK
  Preferred Stock Series A, $0.01 par value, 15,000 and 0,
    respectively, authorized; 5,000 and 0, respectively, issued and
    outstanding, 3,086 and 0, respectively, accrued..................      8,086         --
  Preferred Stock Series C, $0.01 par value; 15,000 and 0,
    respectively, authorized; 11,699 and 0, respectively, issued and
    outstanding......................................................     11,699         --
                                                                       ---------  ---------
TOTAL REDEEMABLE PREFERRED STOCK.....................................     19,785         --
REDEEMABLE WARRANTS..................................................     23,812         --
STOCKHOLDERS' EQUITY
  Common Stock (voting), $0.10 par value; 40,000,000 authorized
    11,446,306 and 15,905,273, respectively, issued and
    outstanding......................................................      1,145      1,591
  Common Stock (nonvoting), $0.01 par value, 5,000,000 authorized;
    758,994 and 0, respectively, issued and outstanding..............          8         --
  Capital in excess of par value.....................................     44,418    213,042
  Retained earnings..................................................     30,249      8,675
                                                                       ---------  ---------
TOTAL STOCKHOLDERS' EQUITY...........................................     75,820    223,308
                                                                       ---------  ---------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY...........................  $1,109,867 $1,148,021
                                                                       ---------  ---------
                                                                       ---------  ---------
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
                       CONSOLIDATED STATEMENTS OF INCOME
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      YEARS ENDED DECEMBER 31,
                                                 ----------------------------------
                                                    1995        1996        1997
                                                 ----------  ----------  ----------
<S>                                              <C>         <C>         <C>
NET SALES......................................  $1,751,462  $2,298,170  $2,558,135
COST OF GOODS SOLD.............................   1,446,949   1,907,209   2,112,204
                                                 ----------  ----------  ----------
GROSS PROFIT...................................     304,513     390,961     445,931
OPERATING EXPENSES:
  Warehousing, marketing and administrative
    expenses...................................     237,197     277,957     311,002
  Non-recurring charges........................          --          --      64,698
  Restructuring charge.........................       9,759          --          --
                                                 ----------  ----------  ----------
  Total operating expenses.....................     246,956     277,957     375,700
                                                 ----------  ----------  ----------
Income from operations.........................      57,557     113,004      70,231
INTEREST EXPENSE...............................      46,186      57,456      53,511
                                                 ----------  ----------  ----------
  Income before income taxes and extraordinary
    item.......................................      11,371      55,548      16,720
INCOME TAXES...................................       5,128      23,555       8,532
                                                 ----------  ----------  ----------
  Income before extraordinary item.............       6,243      31,993       8,188
EXTRAORDINARY ITEM--loss on early retirement of
  debt, net of tax benefit of $967 in 1995 and
  $3,956 in 1997...............................      (1,449)         --      (5,884)
                                                 ----------  ----------  ----------
NET INCOME.....................................       4,794      31,993       2,304
PREFERRED STOCK DIVIDENDS ISSUED AND ACCRUED...       1,998       1,744       1,528
                                                 ----------  ----------  ----------
NET INCOME ATTRIBUTABLE TO COMMON
  STOCKHOLDERS.................................  $    2,796  $   30,249  $      776
                                                 ----------  ----------  ----------
                                                 ----------  ----------  ----------
NET INCOME PER COMMON SHARE:
  Income before extraordinary item.............  $     0.39  $     2.48  $     0.51
  Extraordinary item...........................       (0.13)         --       (0.45)
                                                 ----------  ----------  ----------
  Net income per common share..................  $     0.26  $     2.48  $     0.06
                                                 ----------  ----------  ----------
                                                 ----------  ----------  ----------
Average number of common shares (in
  thousands)...................................      10,747      12,205      13,064
                                                 ----------  ----------  ----------
                                                 ----------  ----------  ----------
NET INCOME PER COMMON SHARE--ASSUMING DILUTION:
  Income before extraordinary item.............  $     0.33  $     2.03  $     0.43
  Extraordinary item...........................       (0.11)         --       (0.38)
                                                 ----------  ----------  ----------
  Net income per common share..................  $     0.22  $     2.03  $     0.05
                                                 ----------  ----------  ----------
                                                 ----------  ----------  ----------
Average number of common shares (in
  thousands)...................................      12,809      14,923      15,380
                                                 ----------  ----------  ----------
                                                 ----------  ----------  ----------
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
           CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
                   (DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)
<TABLE>
<CAPTION>
                                                                                              NUMBER OF
                                               REDEEMABLE PREFERRED STOCK                       COMMON
                                          ------------------------------------  REDEEMABLE      SHARES
                                             A        B        C       TOTAL     WARRANTS      (VOTING)
                                          -------  -------  --------  --------  ----------   ------------
<S>                                       <C>      <C>      <C>       <C>       <C>          <C>
DECEMBER 31, 1994.......................  $ 6,788  $ 6,560  $  9,841  $ 23,189   $  1,650        960,346
  Net income............................       --       --        --        --         --             --
  Preferred stock dividends.............      649      332       763     1,744         --             --
  Repurchase of Series B preferred
    stock...............................       --   (6,892)       --    (6,892)        --             --
  Cash dividends........................       --       --        --        --         --             --
  Accretion of warrants to fair market
    value...............................       --       --        --        --     37,275             --
  Issuance of warrants from option
    grant...............................       --       --        --        --      2,900             --
  Nonvoting common stock issued for
    services related to financing the
    Acquisition issued in exchange for
    common stock, warrants and
    options.............................       --       --        --        --       (460)      (109,159)
  Increase in value of stock option
    grants..............................       --       --        --        --         --             --
  Common stock issued:
    Acquisition.........................       --       --        --        --         --      4,831,873
    Exercise of warrants................       --       --        --        --     (1,673)        58,977
    100% stock dividend                        --       --        --        --         --      5,683,463
    Stock option exercises..............       --       --        --        --         --         20,806
  Other.................................       --       --        --        --         --             --
                                          -------  -------  --------  --------  ----------   ------------
DECEMBER 31, 1995.......................    7,437       --    10,604    18,041     39,692     11,446,306
  Net income............................       --       --        --        --         --             --
  Preferred stock dividends.............      649       --     1,095     1,744         --             --
  Reduction of warrants to fair market
    value...............................       --       --        --        --    (15,880)            --
  Decrease in value of stock option
    grants..............................       --       --        --        --         --             --
  Other.................................       --       --        --        --         --             --
                                          -------  -------  --------  --------  ----------   ------------
DECEMBER 31, 1996.......................    8,086       --    11,699    19,785     23,812     11,446,306
  Net income............................       --       --        --        --         --             --
  Stock dividends issued................      489       --       898     1,387         --             --
  Redemption of Series A and Series C
    preferred stock.....................   (8,575)      --   (12,597)  (21,172)        --             --
  Accretion of lender warrants to fair
    market value........................       --       --        --        --     23,254             --
  Increase in value of stock option
    grants..............................       --       --        --        --         --             --
  Compensation associated with stock
    options.............................       --       --        --        --         --             --
  Conversions of redeemable warrants
    into common stock...................       --       --        --        --    (47,066)     1,408,398
  Issuance of common stock, net of
    offering expenses...................       --       --        --        --         --      2,000,000
  Stock options exercised...............       --       --        --        --         --        299,889
  Conversion of nonvoting common stock
    into common stock...................       --       --        --        --         --        758,994
  Cancellation of common stock..........       --       --        --        --         --         (8,314)
  Other.................................       --       --        --        --         --             --
                                          -------  -------  --------  --------  ----------   ------------
DECEMBER 31, 1997.......................  $    --  $    --  $     --  $     --   $     --     15,905,273
                                          -------  -------  --------  --------  ----------   ------------
                                          -------  -------  --------  --------  ----------   ------------
 
<CAPTION>
                                                     NUMBER OF                  CAPITAL                 TOTAL
                                          COMMON      COMMON        COMMON         IN                  STOCK-
                                           STOCK      SHARES         STOCK       EXCESS   RETAINED    HOLDERS'
                                          (VOTING)  (NONVOTING)   (NONVOTING)    OF PAR   EARNINGS     EQUITY
                                          -------   -----------   -----------   --------  ---------   ---------
<S>                                       <C>       <C>           <C>           <C>       <C>         <C>
DECEMBER 31, 1994.......................  $   10           --         $--       $ 18,139  $  6,626    $  24,775
  Net income............................      --           --          --             --     4,794        4,794
  Preferred stock dividends.............      --           --          --             --    (1,744)      (1,744)
  Repurchase of Series B preferred
    stock...............................      --           --          --             --        --           --
  Cash dividends........................      --           --          --             --      (254)        (254)
  Accretion of warrants to fair market
    value...............................      --           --          --        (28,538)   (8,737)     (37,275)
  Issuance of warrants from option
    grant...............................      --           --          --         (2,900)       --       (2,900)
  Nonvoting common stock issued for
    services related to financing the
    Acquisition issued in exchange for
    common stock, warrants and
    options.............................     (11)     139,474           1          2,749        --        2,739
  Increase in value of stock option
    grants..............................      --           --          --          2,407        --        2,407
  Common stock issued:
    Acquisition.........................     563      215,614           3         35,223        --       35,789
    Exercise of warrants................       6           --          --          1,673        --        1,679
    100% stock dividend                      575      403,906           4             --      (579)          --
    Stock option exercises..............       2           --          --             28        --           30
  Other.................................      --           --          --             90      (106)         (16)
                                          -------   -----------       ---       --------  ---------   ---------
DECEMBER 31, 1995.......................   1,145      758,994           8         28,871        --       30,024
  Net income............................      --           --          --             --    31,993       31,993
  Preferred stock dividends.............      --           --          --             --    (1,744)      (1,744)
  Reduction of warrants to fair market
    value...............................      --           --          --         15,880        --       15,880
  Decrease in value of stock option
    grants..............................      --           --          --           (339)       --         (339)
  Other.................................      --           --          --              6        --            6
                                          -------   -----------       ---       --------  ---------   ---------
DECEMBER 31, 1996.......................   1,145      758,994           8         44,418    30,249       75,820
  Net income............................      --           --          --             --     2,304        2,304
  Stock dividends issued................      --           --          --             --    (1,528)      (1,528)
  Redemption of Series A and Series C
    preferred stock.....................      --           --          --             --        --           --
  Accretion of lender warrants to fair
    market value........................      --           --          --           (915)  (22,339)     (23,254)
  Increase in value of stock option
    grants..............................      --           --          --            380        --          380
  Compensation associated with stock
    options.............................      --           --          --         59,398        --       59,398
  Conversions of redeemable warrants
    into common stock...................     141           --          --         47,074        --       47,215
  Issuance of common stock, net of
    offering expenses...................     200           --          --         71,254        --       71,454
  Stock options exercised...............      30           --          --         (8,270)       --       (8,240)
  Conversion of nonvoting common stock
    into common stock...................      76     (758,994)         (8)           (68)       --           --
  Cancellation of common stock..........      (1)          --          --              1        --           --
  Other.................................      --           --          --           (230)      (11)        (241)
                                          -------   -----------       ---       --------  ---------   ---------
DECEMBER 31, 1997.......................  $1,591           --         $--       $213,042  $  8,675    $ 223,308
                                          -------   -----------       ---       --------  ---------   ---------
                                          -------   -----------       ---       --------  ---------   ---------
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-6
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                    YEARS ENDED DECEMBER 31,
                                                                 -------------------------------
                                                                   1995       1996       1997
                                                                 ---------  ---------  ---------
<S>                                                              <C>        <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income.....................................................  $   4,794  $  31,993  $   2,304
Adjustments to reconcile net income to net cash provided by
  (used in) operating activities:
  Depreciation.................................................     19,708     22,766     21,963
  Amortization.................................................      3,976      3,276      4,078
  Amortization of capitalized financing costs..................      4,172      5,333      4,323
  Extraordinary item--early retirement of debt.................      2,416         --      9,840
  Deferred income taxes........................................       (163)     5,299    (16,091)
  Compensation expense on stock option grants..................      2,407       (339)    60,041
  Other........................................................        301      1,584         51
Changes in operating assets and liabilities, net of acquisition
  in 1995 and 1996:
  Increase in accounts receivable..............................    (32,330)   (15,379)   (20,519)
  Decrease (increase) in inventory.............................     31,656    (71,282)   (48,316)
  Decrease in other assets.....................................      2,765      1,814      9,985
  (Decrease) increase in accounts payable......................     (5,104)    36,352     (1,649)
  Decrease (increase) in accrued liabilities...................     (3,474)   (17,185)    18,036
  Decrease in other liabilities................................     (4,795)    (2,623)    (2,278)
                                                                 ---------  ---------  ---------
      Net cash provided by operating activities................     26,329      1,609     41,768
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions:
  United Stationers Inc., net of cash acquired of $14,500......   (258,438)        --         --
  Lagasse Bros., Inc...........................................         --    (51,896)        --
Capital expenditures...........................................     (8,086)    (8,190)   (13,036)
Proceeds from disposition of property, plant & equipment.......         69     11,076         45
Other..........................................................        164       (861)        --
                                                                 ---------  ---------  ---------
      Net cash used in investing activities....................   (266,291)   (49,871)   (12,991)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings (repayments) under revolver.....................     (3,608)    22,000     49,000
Retirements and principal payments of debt.....................   (412,342)   (30,861)  (117,776)
Borrowings under financing agreements..........................    686,854     57,933         --
Financing costs................................................    (25,290)    (1,851)        --
Issuance of common stock.......................................     12,006         --     71,606
Payment of employee withholding tax related to stock option
  exercises....................................................         --         --     (8,546)
Redemption of Series A and Series C Preferred Stock............         --         --    (21,172)
Redemption of Series B Preferred Stock.........................     (6,892)        --         --
Cash dividend..................................................       (254)        --       (141)
Other..........................................................       (701)        --         --
                                                                 ---------  ---------  ---------
Net cash provided (used in) financing activities...............    249,773     47,221    (27,029)
                                                                 ---------  ---------  ---------
NET CHANGE IN CASH AND CASH EQUIVALENTS........................      9,811     (1,041)     1,748
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR...................      1,849     11,660     10,619
                                                                 ---------  ---------  ---------
CASH AND CASH EQUIVALENTS, END OF YEAR.........................  $  11,660  $  10,619  $  12,367
                                                                 ---------  ---------  ---------
                                                                 ---------  ---------  ---------
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-7
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. BASIS OF PRESENTATION AND PURCHASE ACCOUNTING
 
    On March 30, 1995, Associated Holdings, Inc. ("Associated") purchased 92.5%
of the then outstanding shares of the common stock, $0.10 par value ("Common
Stock") of United Stationers Inc. ("United") for approximately $266.6 million in
the aggregate pursuant to a tender offer (the "Offer"). Immediately thereafter,
Associated merged with and into United (the "Merger" and, collectively with the
Offer, the "Acquisition"), and Associated Stationers, Inc. ("ASI"), a wholly
owned subsidiary of Associated merged with and into United Stationers Supply Co.
("USSC"), a wholly owned subsidiary of United, with United and USSC continuing
as the respective surviving corporations. United, as the surviving corporation
following the Merger, is referred to herein as the "Company." As a result of
share conversions in the Merger, immediately after the Merger, (i) the former
holders of common stock and common stock equivalents of Associated owned shares
of Common Stock and warrants or options to purchase shares of Common Stock
constituting in the aggregate approximately 80% of the shares of Common Stock on
a fully diluted basis, and (ii) holders of pre-Merger United common stock owned
in the aggregate approximately 20% of the shares of Common Stock on a fully
diluted basis. Although United was the surviving corporation in the Merger, the
transaction was treated as a reverse acquisition for accounting purposes with
Associated as the acquiring corporation.
 
    The financial information for the year ended December 31, 1995 includes
Associated only for the three months ended March 30, 1995 and the results of the
Company for the nine months ended December 31, 1995. All common and common
equivalent shares have been adjusted to reflect the 100% stock dividend
effective November 9, 1995.
 
    The Acquisition was accounted for using the purchase method of accounting
and, accordingly, the purchase price was allocated to the assets purchased and
the liabilities assumed based upon the estimated fair values at the date of
acquisition with the excess of cost over fair value allocated to goodwill. The
purchase price allocation to property, plant and equipment is amortized over the
estimated useful lives ranging from 3 to 40 years. Goodwill is amortized over 40
years.
 
    The total purchase price of United by Associated and its allocation to
assets and liabilities acquired was as follows (dollars in thousands):
 
<TABLE>
<S>                                                                 <C>
Purchase price:
  Price of United shares purchased by Associated..................  $ 266,629
  Fair value of United shares not acquired in the Offer...........     21,618
  Transaction costs...............................................      6,309
                                                                    ---------
      Total purchase price........................................  $ 294,556
                                                                    ---------
                                                                    ---------
Allocation of purchase price:
  Current assets..................................................  $ 542,993
  Property, plant and equipment...................................    151,012
  Goodwill........................................................     74,503
  Other assets....................................................      7,699
  Liabilities assumed.............................................   (481,651)
                                                                    ---------
      Total purchase price........................................  $ 294,556
                                                                    ---------
                                                                    ---------
</TABLE>
 
    Immediately following the Merger, the number of outstanding shares of Common
Stock was 11,996,154 (or 13,947,440 on a diluted basis), of which (i) the former
holders of Class A Common Stock,
 
                                      F-8
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
1. BASIS OF PRESENTATION AND PURCHASE ACCOUNTING (CONTINUED)
$0.01 par value, and Class B Common Stock, $0.01 par value, of Associated
(collectively "Associated Common Stock") and warrants or options to purchase
Associated Common Stock in the aggregate owned 9,206,666 shares constituting
approximately 76.7% of the outstanding shares of Common Stock and outstanding
warrants or options for 1,951,286 shares (collectively 80.0% on a diluted basis)
and (ii) pre-Merger holders of shares of Common Stock (other than
Associated-owned and treasury shares) in the aggregate owned 2,789,488 shares of
Common Stock constituting approximately 23.3% of the outstanding shares (or
20.0% on a diluted basis). As used in this paragraph, the term "Common Stock"
includes shares of nonvoting common stock, $0.01 par value, of the Company, all
of which were converted into voting Common Stock in the fourth quarter of 1997.
 
    On October 31, 1996, the Company acquired all of the capital stock of
Lagasse Bros., Inc. ("Lagasse") for approximately $51.9 million. The acquisition
was financed primarily through senior debt. The Lagasse acquisition has been
accounted for using the purchase method of accounting and, accordingly, the
purchase price has been allocated to the assets purchased and the liabilities
assumed based upon the estimated fair values at the date of acquisition with the
excess of cost over fair value of approximately $39.0 million allocated to
goodwill. The financial information for the year ended December 31, 1996
includes the results of Lagasse for two months ended December 31, 1996. The
actual and pro forma effects of this acquisition are not material.
 
    On October 9, 1997, the Company completed a 2.0 million share primary
offering of Common Stock and a 3.4 million share secondary offering of Common
Stock ("October Equity Offering"). The shares were priced at $38.00 per share,
before underwriting discounts and a commission of $1.90 per share. The aggregate
net proceeds to the Company from this October Equity Offering of $72.2 million
(before deducting expenses) and proceeds of $0.1 million resulting from the
conversion of 1,119,038 warrants into Common Stock were used to (i) redeem $50.0
million of the Company's 12 3/4% Senior Subordinated Notes and pay the
redemption premium thereon of $6.4 million, (ii) pay fees related to the October
Equity Offering, and (iii) reduce by $15.5 million the indebtedness under the
Term Loan Facilities. The repayment of indebtedness resulted in an extraordinary
loss of $9.8 million ($5.9 million net of tax benefit of $3.9 million) and
caused a permanent reduction of the amount borrowable under the Term Loan
Facilities.
 
    As a result of the October Equity Offering, the Company recognized the
following charges in the fourth quarter of 1997 (i) pre-tax non-recurring
non-cash charge of $59.4 million ($35.5 million net of tax benefit of $23.9
million) and a non-recurring cash charge of $5.3 million ($3.2 million net of
tax benefit of $2.1 million) related to the vesting of stock options (see Note
10) and the termination of certain management advisory service agreements (see
Note 13), respectively, and (ii) an extraordinary loss of $9.8 million ($5.9
million net of tax benefit of $3.9 million) related to the early retirement of
debt (see Note 6), (collectively "Charges").
 
    Net income attributable to common stockholders for the year ended December
31, 1997, before Charges, was $45.4 million, up 50.3%, compared with $30.2
million in 1996. Diluted earnings per share, before Charges, for 1997 was $2.95
on 15.4 million weighted average shares outstanding, up 45.3%, compared with
$2.03 on 14.9 million weighted average shares outstanding for the prior year.
 
2. OPERATIONS
 
    The Company operates in a single segment as a national wholesale distributor
of business products. The Company offers approximately 30,000 items from more
than 500 manufacturers. This includes a broad
 
                                      F-9
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
2. OPERATIONS (CONTINUED)
spectrum of office products, computer supplies, office furniture and facilities
management supplies. The Company primarily serves commercial and contract office
products dealers. Its customers include more than 15,000 resellers--such as
office products dealers, buying groups, office furniture dealers, super stores
and mass merchandisers, mail order houses, computer products resellers, sanitary
supply distributors and warehouse clubs. The Company has a distribution network
of 41 Regional Distribution Centers. Through its integrated computer system, the
Company provides a high level of customer service and overnight delivery. In
addition, the Company has 16 Lagasse Distribution Centers, specifically serving
janitorial and sanitary supply distributors.
 
3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
    The consolidated financial statements include the accounts of the Company
and its subsidiaries. All significant intercompany accounts and transactions
have been eliminated in consolidation.
 
REVENUE RECOGNITION
 
    Revenue is recognized when a product is shipped and title is transferred to
the customer in the period the sale is reported.
 
CASH AND CASH EQUIVALENTS
 
    Investments in low-risk instruments that have original maturities of three
months or less are considered to be cash equivalents. Cash equivalents are
stated at cost which approximates market value.
 
INVENTORIES
 
    Inventories constituting approximately 92% and 91% of total inventories at
December 31, 1996 and 1997, respectively, have been valued under the last-in,
first-out ("LIFO") method. Prior to 1995, all inventories were valued under the
first-in, first-out ("FIFO") method. Effective January 1, 1995, Associated
changed its method of accounting for the cost of inventory from the FIFO method
to the LIFO method. Associated made this change in contemplation of its
acquisition of United (accounted for as a reverse acquisition) so that its
method would conform to that of United. Associated believed that the LIFO method
provided a better matching of current costs and current revenues and that
earnings reported under the LIFO method were more easily compared to that of
other companies in the wholesale industry where the LIFO method is common. This
change resulted in a charge to pre-tax income of the Company of approximately
$8.8 million ($5.3 million net of tax benefit of $3.5 million or $0.41 per
common and common equivalent share) for the year ended December 31, 1995.
Inventory valued under the FIFO and LIFO accounting methods are recorded at the
lower of cost or market. If the lower of FIFO cost or market method of inventory
accounting had been used by the Company for all inventories, merchandise
inventories would have been approximately $4.8 million and $4.3 million higher
than reported at December 31, 1996 and 1997, respectively.
 
PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment is recorded at cost. Depreciation and
amortization are determined by using the straight-line method over the estimated
useful lives of the assets.
 
                                      F-10
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    The estimated useful life assigned to fixtures and equipment is from two to
ten years; the estimated useful life assigned to buildings does not exceed 40
years; leasehold improvements are amortized over the lesser of their useful
lives or the term of the applicable lease.
 
GOODWILL
 
    Goodwill represents the excess cost over the value of net assets of
businesses acquired and is amortized on a straight-line basis over 40 years. The
Company continually evaluates whether events or circumstances have occurred
indicating that the remaining estimated useful life of goodwill may not be
appropriate. When factors indicate that goodwill should be evaluated for
possible impairment, the Company will use an estimate of undiscounted future
operating income compared to the carrying value of goodwill to determine if a
write-off is necessary. The cumulative amount of goodwill amortized at December
31, 1996 and 1997 is $4.0 million and $7.6 million, respectively.
 
SOFTWARE CAPITALIZATION
 
    The Company capitalizes major internal and external systems development
costs determined to have benefits for future periods. Amortization is recognized
over the periods in which the benefits are realized, generally not to exceed
three years.
 
INCOME TAXES
 
    Income taxes are accounted for using the liability method under which
deferred income taxes are recognized for the estimated tax consequences for
temporary differences between the financial statement carrying amounts and the
tax basis of assets and liabilities. Provision has not been made for deferred
U.S. income taxes on the undistributed earnings of the Company's foreign
subsidiaries because these earnings are intended to be permanently invested.
 
FOREIGN CURRENCY TRANSLATION
 
    The functional currency for the Company's foreign operations is the local
currency.
 
                                      F-11
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
RECLASSIFICATION
 
    Certain amounts from prior periods have been reclassified to conform to the
1997 basis of presentation.
 
    During the fourth quarter of 1996, the Company reclassified certain delivery
and occupancy costs from operating expenses to cost of goods sold to conform the
Company's presentation to the presentation used by others in the business
products industry. The following table sets forth the impact of the
reclassification for the years presented in the Consolidated Statements of
Income:
 
<TABLE>
<CAPTION>
                                                             FOR THE YEARS ENDED
                                                                 DECEMBER 31,
                                                            ----------------------
                                                              1995(1)      1996
                                                            -----------  ---------
<S>                                                         <C>          <C>
Gross Margin as a Percent of Net Sales:
Gross margin prior to reclassification....................        21.8%       21.0%
Gross margin as reported..................................        17.4%       17.0%
Operating Expenses as a Percent of Net Sales:
Operating expense ratio prior to reclassification.........        17.9%(2)      16.1%
Operating expense ratio as reported.......................        13.5  (2)      12.1%
</TABLE>
 
- ------------------------
 
(1) Includes Associated only for the three months ended March 30, 1995 and the
    results of the Company for the nine months ended December 31, 1995.
 
(2) Excludes a restructuring charge of $9.8 million.
 
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 amounts reported in the Consolidated Financial
Statements and accompanying notes. Actual results could differ from these
estimates.
 
NEW ACCOUNTING PRONOUNCEMENTS
 
    At December 31, 1997, the Company adopted Statement of Financial Accounting
Standards No. 128 ("SFAS No. 128"), "Earnings Per Share." SFAS No. 128
establishes standards for computing and presenting earnings per share ("EPS").
These new standards simplify the calculation of EPS presently contained in
Accounting Principles Board Opinion No. 15, "Earnings Per Share," and various
other pronouncements, and makes them comparable to international standards. SFAS
No. 128 replaces the presentation of primary and fully diluted EPS with basic
and diluted EPS. The Company currently has a complex capital structure; as a
result, the Company is required to present (i) both basic and diluted EPS on the
face of the consolidated statement of income and (ii) a reconciliation of the
numerator and denominator of the basic EPS computation to the numerator and
denominator of the diluted EPS calculation. The earnings per share amounts prior
to 1997 have been restated as required to comply with SFAS No. 128.
 
    During 1996, the Company adopted the supplemental disclosure requirement of
Statement of Financial Accounting Standards No. 123 ("SFAS No. 123"),
"Accounting for Stock-Based Compensation." SFAS No. 123 encourages but does not
require adoption of a fair value method of accounting for stock
 
                                      F-12
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
options. For those entities which do not elect to adopt the fair value method,
the new standard requires supplemental disclosure regarding the pro forma
effects of that method. The Company has chosen to continue to account for
stock-based compensation using the intrinsic value based method of accounting
prescribed by the Accounting Principles Board Opinion No. 25 ("APB No. 25"),
"Accounting for Stocks Issued to Employees," and related Interpretations.
Adoption of SFAS No. 123 will have no impact on the financial position or
results of operations of the Company.
 
    During 1996, the Company adopted Statement of Financial Accounting Standards
No. 121 ("SFAS No. 121"), "Accounting for the Impairment of Long-Lived Assets
and Long-Lived Assets to be Disposed Of." SFAS No. 121 requires that an
impairment loss be recorded on long-lived assets used in operations when
indicators of impairment are present and the undiscounted cash flows estimated
to be generated by those assets are less than the assets' carrying amount. SFAS
No. 121 also addresses the accounting for long-lived assets that are expected to
be disposed. The effect of adoption was not material.
 
4. EARNINGS PER SHARE
 
    Net income per common share is based on net income after preferred stock
dividend requirements. Basic earnings per share is calculated on the weighted
average number of common shares outstanding. Diluted earnings per share is
calculated on the weighted average number of common and common equivalent shares
outstanding during the period. Stock options and warrants are considered to be
common equivalent shares.
 
                                      F-13
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
4. EARNINGS PER SHARE (CONTINUED)
    The following table sets forth the computation of basic and diluted earnings
per share (in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                                   YEARS ENDED DECEMBER 31,
                                                         --------------------------------------------
                                                                                             1997
                                                                                            BEFORE
                                                           1995       1996       1997     CHARGES(1)
                                                         ---------  ---------  ---------  -----------
<S>                                                      <C>        <C>        <C>        <C>
Numerator:
  Income before extraordinary item.....................  $   6,243  $  31,993  $   8,188   $  46,892
  Preferred stock dividends............................      1,998      1,744      1,528       1,528
                                                         ---------  ---------  ---------  -----------
  Numerator for basic and diluted earnings per share--
    income available to common stockholders before
    extraordinary item.................................  $   4,245  $  30,249  $   6,660   $  45,364
                                                         ---------  ---------  ---------  -----------
                                                         ---------  ---------  ---------  -----------
Denominator:
  Denominator for basic earnings per share--weighted
    average shares.....................................     10,747     12,205     13,064      13,064
  Effect of dilutive securities:
    Employee stock options.............................        601      1,315      1,258       1,258
    Warrants...........................................      1,461      1,403      1,058       1,058
                                                         ---------  ---------  ---------  -----------
  Dilutive potential common shares.....................      2,062      2,718      2,316       2,316
  Denominator for diluted earnings per share--adjusted
    weighted average shares and assumed conversions....     12,809     14,923     15,380      15,380
                                                         ---------  ---------  ---------  -----------
                                                         ---------  ---------  ---------  -----------
Basic earnings per share...............................  $    0.39  $    2.48  $    0.51   $    3.47
                                                         ---------  ---------  ---------  -----------
                                                         ---------  ---------  ---------  -----------
Diluted earnings per share.............................  $    0.33  $    2.03  $    0.43   $    2.95
                                                         ---------  ---------  ---------  -----------
                                                         ---------  ---------  ---------  -----------
</TABLE>
 
- ------------------------
 
(1) In the fourth quarter of 1997, the Company recognized the following charges
    (i) pre-tax non-recurring charges of $59.4 million (non-cash) and $5.3
    million (cash) related to the vesting of stock options (see Note 10) and the
    termination of certain management advisory service agreements (see Note 13),
    respectively, and (ii) an extraordinary loss of $9.8 million ($5.9 million
    net of tax benefit of $3.9 million) related to the early retirement of debt
    (see Note 6).
 
5. BUSINESS COMBINATION AND RESTRUCTURING CHARGE
 
    The following summarized unaudited pro forma operating data for the year
ended December 31, 1995 is presented giving effect to the Acquisition as if it
had been consummated at the beginning of the respective period and, therefore,
reflects the results of United and Associated on a consolidated basis. These pro
forma results have been prepared for comparative purposes only and do not
purport to be indicative of the results of operations that actually would have
resulted had the combination been in effect on the date indicated, or which may
result in the future. The pro forma results exclude one-time non-
 
                                      F-14
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
5. BUSINESS COMBINATION AND RESTRUCTURING CHARGE (CONTINUED)
recurring charges or credits directly attributable to the transaction (dollars
in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                                       PRO FORMA TWELVE MONTHS
                                                                       ENDED DECEMBER 31, 1995
                                                                       -----------------------
<S>                                                                    <C>
Net sales............................................................       $   2,201,860
Income before income taxes...........................................              22,737
Net income...........................................................              13,063
Net income per diluted common and common equivalent share............       $        0.80
</TABLE>
 
    The pro forma income statement adjustments consist of (i) increased
depreciation expense resulting from the write-up of certain fixed assets to fair
value, (ii) additional incremental goodwill amortization, (iii) additional
incremental interest expense due to debt issued, net of debt retired, and (iv)
reduction in preferred stock dividends due to the repurchase of the Series B
preferred stock.
 
    The historical results for the twelve months ended December 31, 1995 include
a restructuring charge of $9.8 million ($5.9 million net of tax benefit of $3.9
million). The restructuring charge included severance costs totaling $1.8
million. The Company's consolidation plan specified that 330 distribution, sales
and corporate positions, 180 of which related to pre-Merger Associated, were to
be eliminated substantially within one year following the Merger. The Company
had achieved its target, with the related termination costs of approximately
$1.8 million charged against the reserve. The restructuring charge also included
distribution center closing costs totaling $6.7 million and stockkeeping unit
reduction costs totaling $1.3 million. The consolidation plan called for the
closing of eight redundant distribution centers, six of which related to
pre-Merger Associated, and the elimination of overlapping inventory items from
the Company's catalogs substantially within the one-year period following the
Merger. Estimated distribution center closing costs included (i) the net
occupancy costs of leased facilities after they are vacated until expiration of
leases and (ii) the losses on the sale of owned facilities and the facilities'
furniture, fixtures, and equipment. Estimated stockkeeping unit reduction costs
included losses on the sale of inventory items which have been discontinued
solely as a result of the Acquisition. As of December 31, 1997, five of the six
redundant pre-Merger Associated distribution centers had been closed with $5.5
million charged against the reserve and $2.0 million related to stockkeeping
unit reduction costs had also been charged against the reserve. As of December
31, 1997, the Company's consolidation plan had been completed. Seven of the
eight redundant distribution centers had been closed.
 
    The historical results for 1995 also included an extraordinary charge of
approximately $2.4 million ($1.4 million net of tax benefit of $1.0 million) of
financing costs and original issue discount relating to the debt retired. In
addition, the historical results for 1995 included compensation expense relating
to an increase in the value of employee stock options of approximately $1.5
million ($0.9 million net of tax benefit of $0.6 million) as a result of the
Acquisition and Merger. The pro forma twelve months ended December 31, 1995 do
not include the extraordinary write-off.
 
                                      F-15
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6. LONG-TERM DEBT
 
    Long-term debt consists of the following amounts (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                           1996        1997
                                                                        ----------  ----------
<S>                                                                     <C>         <C>
Revolver..............................................................  $  207,000  $  256,000
Term Loans
  Tranche A, due in installments until September 30, 2001.............     144,374      97,524
  Tranche B, due in installments until September 30, 2003.............      64,750      51,275
Senior Subordinated Notes.............................................     150,000     100,000
Mortgage at 9.4%, due in installments until 1999......................       2,071       1,957
Industrial development bonds, at market interest rates, maturing at
  various dates through 2011..........................................      14,300      14,300
Industrial development bonds, at 66% to 78% of prime, maturing at
  various dates through 2004..........................................      15,500      15,500
Other long-term debt..................................................       1,541         579
                                                                        ----------  ----------
                                                                           599,536     537,135
  Less--current maturities............................................     (46,923)    (44,267)
                                                                        ----------  ----------
Total.................................................................  $  552,613  $  492,868
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
    The prevailing prime interest rate at the end of 1996 and 1997 was 8.25% and
8.50%, respectively.
 
    As of December 31, 1997, the credit facilities under the Amended and
Restated Credit Agreement (the "Credit Agreement") consisted of $148.8 million
of term loan borrowings (the "Term Loan Facilities"), and up to $325.0 million
of revolving loan borrowings (the "Revolving Credit Facility"). In the fourth
quarter of 1997, the Company redeemed $50.0 million of Notes (as defined) with
net proceeds from the October Equity Offering and as a result the Company
recognized an extraordinary loss on the early retirement of debt of $9.8 million
($5.9 million net of tax benefit of $3.9 million). Therefore, the Company has
$100.0 million of borrowings remaining under the 12 3/4% Senior Subordinated
Notes due 2005 (the "Notes").
 
    The Term Loan Facilities consist of a $97.5 million Tranche A term loan
facility (the "Tranche A Facility") and a $51.3 million Tranche B term loan
facility (the "Tranche B Facility"). Quarterly payments under the Tranche A
facility range from $5.03 million at December 31, 1997 to $6.25 million at
September 30, 2001. Quarterly payments under the Tranche B Facility range from
$0.20 million at December 31, 1997 to $5.00 million at September 30, 2003. On
March 31, 1998, principal payments of $15.8 million and $8.7 million are
required to be paid from Excess Cash Flow (as defined in the Credit Agreement)
at December 31, 1997 for the Tranche A and Tranche B Facilities, respectively.
During October 1997, Tranche A and Tranche B Facilities were paid down by $10.3
million and $5.2 million, respectively, from net proceeds received from the
October Equity Offering in October 1997.
 
    The Revolving Credit Facility is limited to the lesser of $325.0 million or
a borrowing base equal to: 80% of Eligible Receivables (as defined in the Credit
Agreement); plus 50% of Eligible Inventory (as defined in the Credit Agreement)
(provided that no more than 60% or, during certain periods 65%, of the Borrowing
Base may be attributable to Eligible Inventory); plus the aggregate amount of
cover for Letter of Credit Liabilities (as defined in the Credit Agreement). In
addition, for each year, the Company must
 
                                      F-16
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6. LONG-TERM DEBT (CONTINUED)
repay revolving loans so that for a period of 30 consecutive days in each year
the aggregate revolving loans do not exceed $250.0 million. The Revolving Credit
Facility matures on October 31, 2001.
 
    The Term Loan Facilities and the Revolving Credit Facility are secured by
first priority pledges of the stock of USSC, all of the stock of the domestic
direct and indirect subsidiaries of USSC, certain of the stock of all of the
foreign direct and indirect subsidiaries of USSC and security interests in, and
liens upon, all accounts receivable, inventory, contract rights and other
certain personal and certain real property of USSC and its domestic
subsidiaries.
 
    The loans outstanding under the Term Loan Facilities and the Revolving
Credit Facility bear interest as determined within a set range with the rate
based on the ratio of total debt to earnings before interest, taxes,
depreciation and amortization ("EBITDA"). The Tranche A Facility and the
Revolving Credit Facility bear interest, at prime plus 0.25% to 1.25% or, at the
Company's option, the London Interbank Offering Rate ("LIBOR") plus 1.50% to
2.50%. The Tranche B Facility bears interest at prime plus 1.25% to 1.75% or, at
the Company's option, LIBOR plus 2.50% to 3.00%.
 
    The Credit Agreement contains representations and warranties, affirmative
and negative covenants and events of default customary for financings of this
type. As of December 31, 1997, the Company was in compliance with all covenants
contained in the Credit Agreement.
 
    The Company is exposed to market risk for changes in interest rates. The
Company may enter into interest rate protection agreements, including collar
agreements, to reduce the impact of fluctuations in interest rates on a portion
of its variable rate debt. Such agreements generally require the Company to pay
to or entitle the Company to receive from the other party the amount, if any, by
which the Company's interest payments fluctuate beyond the rates specified in
the agreements. The Company is subject to the credit risk that the other party
may fail to perform under such agreements. The Company's allocated cost of such
agreements is amortized to interest expense over the term of the agreements, and
the unamortized cost is included in other assets. Payments received or made as a
result of the agreements, if any, are recorded as an addition or a reduction to
interest expense. At December 31, 1997, the Company had agreements which collar
$200.0 million of the Company's borrowings under the Credit Facilities at LIBOR
rates between 6.0% and 8.0%, which expire in April 1998. From April 1998 through
October 1999, the Company has interest rate collar agreements on $200.0 million
of borrowings at LIBOR rates between 5.2% and 8.0%. For the years ended December
31, 1995, 1996 and 1997, the Company recorded $0.1 million, $0.9 million and
$0.6 million, respectively, to interest expense resulting from LIBOR rate
fluctuations below the floor rate specified in the collar agreements.
 
    The right of United to participate in any distribution of earnings or assets
of USSC is subject to the prior claims of the creditors of USSC. In addition,
the Credit Agreement contains certain restrictive covenants, including covenants
that restrict or prohibit USSC's ability to pay dividends and make other
distributions to United.
 
                                      F-17
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6. LONG-TERM DEBT (CONTINUED)
    Debt maturities for the years subsequent to December 31, 1997 are as follows
(dollars in thousands):
 
<TABLE>
<CAPTION>
YEAR                                                                                  AMOUNT
- ----------------------------------------------------------------------------------  ----------
<S>                                                                                 <C>
1998..............................................................................  $   44,267
1999..............................................................................      25,684
2000..............................................................................      26,722
2001..............................................................................     282,555
2002..............................................................................      31,304
Later years.......................................................................     126,603
                                                                                    ----------
Total.............................................................................  $  537,135
                                                                                    ----------
                                                                                    ----------
</TABLE>
 
    At December 31, 1996 and 1997, the Company had available letters of credit
of $55.3 million and $52.9 million, respectively, of which $52.8 million and
$49.8 million, respectively, were outstanding.
 
7. LEASES
 
    The Company has entered into several non-cancelable long-term leases for
certain property and equipment. Future minimum rental payments under operating
leases in effect at December 31, 1997 having initial or remaining non-cancelable
lease terms in excess of one year are as follows (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                                      OPERATING
YEAR                                                                                  LEASES(1)
- -----------------------------------------------------------------------------------  -----------
<S>                                                                                  <C>
1998...............................................................................   $  19,108
1999...............................................................................      15,675
2000...............................................................................      12,811
2001...............................................................................      10,467
2002...............................................................................       7,235
Later years........................................................................      15,455
                                                                                     -----------
Total minimum lease payments.......................................................   $  80,751
                                                                                     -----------
                                                                                     -----------
</TABLE>
 
- ------------------------
 
(1) Operating leases are net of immaterial sublease income.
 
    Rental expense for all operating leases was approximately $14.2 million,
$18.8 million and $20.5 million in 1995, 1996 and 1997, respectively.
 
                                      F-18
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
8. PENSION PLANS AND DEFINED CONTRIBUTION PLAN
 
PENSION PLANS
 
    In connection with the Merger and Acquisition, the Company assumed the
pension plans of United. Associated did not have a pension plan. Former
Associated employees entered the pension plans on July 1, 1996. As of this date,
the Company has pension plans covering substantially all of its employees. Non-
contributory plans covering non-union employees provide pension benefits that
are based on years of credited service and a percentage of annual compensation.
Non-contributory plans covering union members generally provide benefits of
stated amounts based on years of service. The Company funds the plans in
accordance with current tax laws.
 
    The following table sets forth the plans' funded status at December 31, 1996
and 1997 (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                            1996       1997
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Actuarial Present Value of Benefit Obligation
  Vested benefits.......................................................  $  19,015  $  22,611
  Non-vested benefits...................................................      1,431      2,092
                                                                          ---------  ---------
Accumulated benefit obligation..........................................     20,446     24,703
Effect of projected future compensation levels..........................      3,110      4,070
                                                                          ---------  ---------
Projected benefit obligation............................................     23,556     28,773
Plan assets at fair value...............................................     28,373     33,562
                                                                          ---------  ---------
Plan assets in excess of projected benefit obligation...................      4,817      4,789
Unrecognized prior service cost.........................................        720        888
Unrecognized net gain due to past experience different from
  assumptions...........................................................     (4,348)    (6,020)
                                                                          ---------  ---------
Prepaid pension (asset) liability recognized in the Consolidated Balance
  Sheets................................................................  $   1,189  $    (343)
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
    The plans' assets consist of corporate and government debt securities and
equity securities. Net periodic pension cost for 1995, 1996 and 1997 for pension
and supplemental benefit plans includes the following components (dollars in
thousands):
 
<TABLE>
<CAPTION>
                                                                  1995       1996       1997
                                                                ---------  ---------  ---------
<S>                                                             <C>        <C>        <C>
Service cost-benefit earned during the period.................  $   1,142  $   1,884  $   2,333
Interest cost on projected benefit obligation.................      1,157      1,652      1,833
Actual return on assets.......................................     (2,711)    (3,468)    (5,496)
Net amortization and deferral.................................      1,382      1,495      3,375
                                                                ---------  ---------  ---------
Net periodic pension cost.....................................  $     970  $   1,563  $   2,045
                                                                ---------  ---------  ---------
                                                                ---------  ---------  ---------
</TABLE>
 
                                      F-19
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
8. PENSION PLANS AND DEFINED CONTRIBUTION PLAN (CONTINUED)
    The assumptions used in accounting for the Company's defined benefit plans
for the three years presented are set forth below:
 
<TABLE>
<CAPTION>
                                                                             1995        1996        1997
                                                                           ---------     -----     ---------
<S>                                                                        <C>        <C>          <C>
Assumed discount rate....................................................       7.25%        7.5%       7.25%
Rates of compensation increase...........................................        5.5%        5.5%        5.5%
Expected long-term rate of return on plan assets.........................        7.5%        7.5%        7.5%
</TABLE>
 
DEFINED CONTRIBUTION
 
    The Company has a defined contribution plan in which all salaried employees
and certain hourly paid employees of the Company are eligible to participate
following completion of six consecutive months of employment. The plan permits
employees to have contributions made as 401(k) salary deferrals on their behalf,
or as voluntary after-tax contributions, and provides for Company contributions,
or contributions matching employees salary deferral contributions, at the
discretion of the Board of Directors. In addition, the Board of Directors
approved a special contribution in 1997 of approximately $1.0 million to the
United Stationers 401(k) Savings Plan on behalf of certain non-highly
compensated employees who are eligible for participation in the plan. Company
contributions for matching of employees contributions were approximately $0.6
million, $0.9 million and $1.0 million in 1995, 1996 and 1997, respectively.
 
9. POSTRETIREMENT BENEFITS
 
    The Company maintains a postretirement plan. The plan is unfunded and
provides health care benefits to substantially all retired non-union employees
and their dependents. Eligibility requirements are based on the individual's age
(minimum age of 55), years of service and hire date. The benefits are subject to
retiree contributions, deductibles, co-payment provisions and other limitations.
Retirees pay one-half of the projected plan costs.
 
    The following table sets forth the amounts recognized in the Company's
Consolidated Balance Sheets as of December 31, 1996 and 1997 (dollars in
thousands):
 
<TABLE>
<CAPTION>
                                                                               1996       1997
                                                                             ---------  ---------
<S>                                                                          <C>        <C>
Retirees...................................................................  $     877  $     618
Other fully eligible plan participants.....................................        632        632
Other active plan participants.............................................      1,588      1,795
                                                                             ---------  ---------
Total accumulated postretirement benefit obligation........................      3,097      3,045
Unrecognized net gain......................................................          1        415
                                                                             ---------  ---------
Accrued postretirement benefit obligation..................................  $   3,098  $   3,460
                                                                             ---------  ---------
                                                                             ---------  ---------
</TABLE>
 
                                      F-20
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
9. POSTRETIREMENT BENEFITS (CONTINUED)
    The cost of postretirement health care benefits for the years ended December
31, 1995, 1996 and 1997 were as follows (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                          1995       1996       1997
                                                                        ---------  ---------  ---------
<S>                                                                     <C>        <C>        <C>
Service cost..........................................................  $     161  $     239  $     268
Interest on accumulated benefit obligation............................        109        204        190
Unrecognized net gain.................................................         --         --        (15)
                                                                        ---------  ---------  ---------
Net postretirement benefit cost.......................................  $     270  $     443  $     443
                                                                        ---------  ---------  ---------
                                                                        ---------  ---------  ---------
</TABLE>
 
    The assumptions used in accounting for the Company's postretirement plan for
the three years presented are set forth below. Because the Company's annual
medical cost increases for current and future retirees and their dependents are
capped at 3% per year, which is the assumed health care trend rate used in
calculating the accumulated benefit obligation, an increase in the medical trend
rate above 3% has no effect on the accumulated postretirement benefit
obligation.
 
<TABLE>
<CAPTION>
                                                                              1995         1996        1997
                                                                              -----        -----     ---------
<S>                                                                        <C>          <C>          <C>
Assumed average heath care cost trend rate...............................         3.0%         3.0%        3.0%
Assumed discount rate....................................................         7.5%         7.5%       7.25%
</TABLE>
 
10. STOCK OPTION PLAN
 
    The Management Equity Plan (the "Plan"), as amended, is administered by the
Board of Directors, although the Plan allows the Board of Directors of the
Company to designate an option committee to administer the Plan. The Plan
provides for the issuance of shares of Common Stock through the exercise of
options, to key officers and management employees of the Company, either as
incentive stock options or as non-qualified stock options.
 
    In October 1997, the Company's stockholders approved an amendment to the
Plan which provided for the issuance of approximately 1.5 million additional
options to key management employees and directors of the Company. During 1997,
approximately 0.3 million options were granted to management employees and
directors at fair market value.
 
    In September 1995, the Company's Board of Directors approved an amendment to
the Plan which provided for the issuance of options in connection with the
Merger ("Merger Incentive Options") to key management employees of the Company
exercisable for up to 2.2 million additional shares of its Common Stock.
Subsequently, approximately 2.2 million options were granted during 1995 and
1996 to management employees. Some of the options were granted at an option
price below market value and the option price of certain options increases by
$0.625 on a quarterly basis effective April 1, 1996.
 
    These Merger Incentive Options were granted in order to provide incentives
to management with respect to the successful development of ASI and the
integration of ASI with the Company. All Merger Incentive Options were vested
and became exercisable with the completion of the October Equity Offering in
October 1997. All Common Stock issued from the exercise of Merger Incentive
Options is subject to a six month holding period which expires on April 10,
1998. In the fourth quarter of 1997, the Company was required to recognize
compensation expense based upon the difference between the fair market value of
the Common Stock and the exercise prices. Based on the closing stock price on
October 10, 1997 of
 
                                      F-21
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
10. STOCK OPTION PLAN (CONTINUED)
$39.125 and options outstanding as of October 10, 1997, the Company recognized a
non-recurring non-cash charge of $59.4 million ($35.5 million net of tax benefit
of $23.9 million).
 
    An optionee under the Plan must pay the full option price upon exercise of
an option (i) in cash, (ii) with the consent of the Board of Directors of the
Company, by delivering mature shares of Common Stock already owned by such
optionee (including shares to be received upon exercise of the option) and
having a fair market value at least equal to the exercise price or (iii) in any
combination of the foregoing. The Company may require the optionee to satisfy
federal tax withholding obligations with respect to the exercise of options by
(i) additional withholding from the employee's salary, (ii) requiring the
optionee to pay in cash or (iii) reducing the number of shares of Common Stock
to be issued (except in the case of incentive options).
 
    The following table summarizes the transactions of the Plan for the last
three years:
 
<TABLE>
<CAPTION>
                                                          WEIGHTED                 WEIGHTED                 WEIGHTED
                                                           AVERAGE                  AVERAGE                  AVERAGE
          MANAGEMENT EQUITY PLAN                          EXERCISE                 EXERCISE                 EXERCISE
       (EXCLUDING RESTRICTED STOCK)             1995       PRICES        1996       PRICES        1997       PRICES
- -------------------------------------------  ----------  -----------  ----------  -----------  ----------  -----------
<S>                                          <C>         <C>          <C>         <C>          <C>         <C>
Options outstanding at beginning of the
  period...................................     217,309   $    1.45    2,030,996   $   10.73    2,497,768   $   11.61
Granted....................................   1,854,649       11.65      650,772        7.95      269,000       22.87
Exercised..................................     (20,804)       1.45           --          --     (846,871)      15.41
Canceled...................................     (20,158)       1.45     (184,000)       7.64     (121,000)      14.76
                                             ----------               ----------               ----------
Options outstanding at end of the period...   2,030,996   $   10.73    2,497,768   $   11.61    1,798,897   $   13.77
                                             ----------               ----------               ----------
                                             ----------               ----------               ----------
</TABLE>
 
    The following table summarizes information concerning outstanding options of
the Plan at
December 31, 1997:
 
<TABLE>
<CAPTION>
                                                                                     REMAINING
                                                                       NUMBER       CONTRACTUAL
EXERCISE PRICES                                                      OUTSTANDING   LIFE (YEARS)
- -------------------------------------------------------------------  -----------  ---------------
<S>                                                                  <C>          <C>
$ 1.45.............................................................     378,183           4.09
  5.12.............................................................     116,250           4.74
 16.88.............................................................   1,037,464           4.74
 20.25.............................................................       2,000           4.74
 21.63.............................................................     250,000           9.00
 44.25.............................................................      15,000           9.87
                                                                     -----------
Total..............................................................   1,798,897
                                                                     -----------
                                                                     -----------
</TABLE>
 
    All share and per share data have been restated to reflect the 100% stock
dividend effective November 9, 1995 and the conversion of Associated common
stock as a result of the Merger.
 
    During 1996, the Company adopted the supplemental disclosure requirements of
SFAS No. 123. Accordingly, the Company is required to disclose pro forma net
income and earnings per share as if the
 
                                      F-22
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
10. STOCK OPTION PLAN (CONTINUED)
fair value-based accounting method in SFAS No. 123 had been used to account for
stock-based compensation cost. The Company's Merger Incentive Options granted
under the Plan were considered "all or nothing" awards because the options did
not vest to the employee until the occurrence of a Vesting Event. The fair value
of "all or nothing" awards were measured at the grant date; however,
amortization of compensation expense began when it was probable that the awards
were vested. The October 1997 October Equity Offering constituted a Vesting
Event; as a result, all Merger Incentive Options vested and became exercisable
by the optionees.
 
    Options granted under the Plan during 1997 did not require compensation cost
to be recognized in the income statement; however, they are subject to the
supplemental disclosure requirements of SFAS No. 123. Net income and earnings
per share, before charges (see (1) and (2) below), for 1995 and 1997 represent
the Company's results excluding one-time charges and the pro forma adjustments
required by SFAS No. 123. Had compensation cost been determined on the basis of
SFAS No. 123 for options granted during 1995, 1996 and 1997, net income and
earnings per share would have been adjusted as follows (in thousands, except per
share data):
 
<TABLE>
<CAPTION>
                                                                              1995       1996       1997
                                                                            ---------  ---------  ---------
<S>                                                                         <C>        <C>        <C>
Net income attributable to common stockholders
  As reported.............................................................  $   2,796  $  30,249  $     776
  Before charges..........................................................     10,081(1)    30,249    45,364(2)
  Pro forma...............................................................      2,796     30,249     18,396
 
Net income per common share--basic
  As reported.............................................................  $    0.26  $    2.48  $    0.06
  Before charges..........................................................       0.94(1)      2.48      3.47(2)
  Pro forma...............................................................       0.26       2.48       1.41
  Weighted average shares outstanding.....................................     10,747     12,205     13,064
 
Net income per common share--diluted
  As reported.............................................................  $    0.22  $    2.03  $    0.05
  Before charges..........................................................       0.79(1)      2.03      2.95(2)
  Pro forma...............................................................       0.22       2.03       1.20
  Weighted average shares outstanding and assumed conversions.............     12,809     14,923     15,380
</TABLE>
 
- ------------------------
 
(1) During 1995, the Company recorded a restructuring charge of $9.8 million and
    an extraordinary loss of $2.4 million ($1.4 million net of tax benefit of
    $1.0 million) related to early retirement of debt.
 
(2) The year ended December 31, 1997 reflects non-recurring charges of $59.4
    million (non-cash) and $5.3 million (cash) related to the vesting of stock
    options and the termination of certain management advisory service
    agreements. In addition, during the fourth quarter of 1997 the Company
    recorded an extraordinary loss of $9.8 million ($5.9 million net of tax
    benefit of $3.9 million) related to early retirement of debt.
 
                                      F-23
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
10. STOCK OPTION PLAN (CONTINUED)
 
    The Company uses a binomial option pricing model to estimate the fair value
of options at the date of grant. The weighted average assumptions used to value
options and the weighted average fair value of options granted during 1995, 1996
and 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                                   1995       1996       1997
                                                                 ---------  ---------  ---------
<S>                                                              <C>        <C>        <C>
Fair value of options granted..................................  $    9.33  $   17.67  $   13.69
Exercise price.................................................  $   11.65  $    8.59  $   22.87
Expected stock price volatility................................      102.2%      80.7%      64.7%
Expected dividend yield........................................        0.0%       0.0%       0.0%
Risk-free interest rate........................................        5.9%       5.2%       6.4%
Expected life of options.......................................    3 years    2 years    5 years
</TABLE>
 
11. REDEEMABLE PREFERRED STOCK
 
    At December 31, 1996, the Company had 1,500,000 authorized shares of $0.01
par value preferred stock, of which 15,000 shares were designated as Series A
preferred stock, 15,000 shares were designated as Series C preferred stock, and
1,470,000 shares remained undesignated. Series C preferred stock was junior in
relation to the Series A preferred stock. All preferred stock issued at the date
of inception was valued at the amount of cash paid or assets received for the
stock at $1,000 per share. On September 2, 1997, the Company completed the
redemption of all Series A and Series C preferred stock issued and outstanding
for $8.6 million and $12.7 million, respectively, including accrued and unpaid
dividends thereon. On July 28, 1995, the Company repurchased all Series B
preferred stock issued and outstanding for $7.0 million, including accrued and
unpaid dividends thereon. Upon redemption, each series of preferred stock
resumed the status of undesignated preferred stock. The Company does not have
any preferred stock outstanding as of December 31, 1997.
 
    During the year ended December 31, 1996, 649 shares of Series A preferred
stock were accrued but not issued. As of December 31, 1996, 3,086 shares of
Series A preferred stock have been accrued as dividends but not issued. Also,
noncash dividends were declared and issued for Series C preferred stock in the
amount of 1,095 shares during 1996.
 
12. REDEEMABLE WARRANTS
 
    The Company had 1,227,438 warrants ("Lender Warrants") outstanding at
December 31, 1996, which allowed holders thereof to buy shares of Common Stock
at an exercise price of $0.10 per share. During 1997, 1,227,438 warrants were
exercised into Common Stock resulting in proceeds of $122,744, which was used to
repay indebtedness under the Term Loan Facilities. Outstanding Lender Warrants
as of December 31, 1996 were valued at $19.50 per warrant. During 1996, 203,030
warrants were contributed back to the Company and terminated in connection with
anti-dilution agreements.
 
13. TRANSACTIONS WITH RELATED PARTIES
 
    The Company had management advisory service agreements with three investor
groups. These investor groups provided certain advisory services to the Company
in connection with the Acquisition.
 
    Pursuant to an agreement, Wingate Partners, L.P. ("Wingate Partners") had
agreed to provide certain oversight and monitoring services to the Company in
exchange for an annual fee of up to $725,000,
 
                                      F-24
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
13. TRANSACTIONS WITH RELATED PARTIES (CONTINUED)
payment (but not accrual) of which is subject to restrictions under the Credit
Agreement related to certain Company performance criteria. At the Merger, the
Company paid aggregate fees to Wingate Partners of $2.3 million for services
rendered in connection with the Acquisition. Wingate Partners earned an
aggregate of $603,000, $725,000 and $513,540 with respect to each of the years
ended 1995, 1996 and 1997, respectively, for such oversight and monitoring
services. Under the agreement, the Company was obligated to reimburse Wingate
Partners for its out-of-pocket expenses and indemnify Wingate Partners and its
affiliates from loss in connection with these services.
 
    Pursuant to an agreement, Cumberland Capital Corporation ("Cumberland") had
agreed to provide certain oversight and monitoring services to the Company in
exchange for an annual fee of up to $137,500, payment (but not accrual) of which
is subject to restrictions under the Credit Agreement related to certain Company
performance criteria. At the Merger, the Company paid aggregate fees to
Cumberland of $100,000 for services rendered in connection with the Acquisition.
Pursuant to the agreement, Cumberland earned an aggregate of $129,000, $137,000
and $97,400 with respect to the years ended 1995, 1996 and 1997, respectively,
for such oversight and monitoring services. The Company was also obligated to
reimburse Cumberland for its out-of-pocket expenses and indemnify Cumberland and
its affiliates from loss in connection with these services.
 
    Pursuant to an agreement, Good Capital Co., Inc. ("Good Capital") had an
agreement to provide certain oversight and monitoring services to the Company in
exchange for an annual fee of up to $137,500, payment (but not accrual) of which
is subject to restrictions under the Credit Agreement related to certain Company
performance criteria. At the Merger, the Company paid aggregate fees to Good
Capital of $100,000 for services rendered in connection with the Acquisition.
Pursuant to the agreement, Good Capital earned an aggregate of $129,000,
$137,500 and $97,400 with respect to the years ended 1995, 1996 and 1997,
respectively, for such oversight and monitoring services. The Company was also
obligated to reimburse Good Capital for its out-of-pocket expenses and indemnify
Good Capital and its affiliates from loss in connection with these services.
 
    In the fourth quarter of 1997, the Company terminated the management
advisory service agreements for one-time payments of approximately $2.4 million,
$400,000 and $400,000 to Wingate Partners, Cumberland and Good Capital,
respectively. As indicated in Note 1, these one-time payments were included as
non-recurring charges on the Consolidated Statements of Income.
 
                                      F-25
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
14. INCOME TAXES
 
    The provision for (benefit from) income taxes consists of the following
(dollars in thousands):
 
<TABLE>
<CAPTION>
                                                       YEARS ENDED DECEMBER 31,
                                                    -------------------------------
                                                      1995       1996       1997
                                                    ---------  ---------  ---------
<S>                                                 <C>        <C>        <C>
Currently payable--
  Federal.........................................  $   4,172  $  14,724  $  19,812
  State...........................................      1,119      3,532      4,811
                                                    ---------  ---------  ---------
  Total currently payable.........................      5,291     18,256     24,623
Deferred, net--
  Federal.........................................       (142)     4,614    (12,889)
  State...........................................        (21)       685     (3,202)
                                                    ---------  ---------  ---------
    Total deferred, net...........................       (163)     5,299    (16,091)
                                                    ---------  ---------  ---------
Provision for income taxes........................  $   5,128  $  23,555  $   8,532
                                                    ---------  ---------  ---------
                                                    ---------  ---------  ---------
</TABLE>
 
    The Company's effective income tax rates for the years ended December 31,
1995, 1996 and 1997 varied from the statutory Federal income tax rate as set
forth in the following table (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                      YEARS ENDED DECEMBER 31,
                                               ----------------------------------------------------------------------
                                                        1995                    1996                    1997
                                               ----------------------  ----------------------  ----------------------
                                                             % OF                    % OF                    % OF
                                                            PRE-TAX                PRE- TAX                PRE- TAX
                                                AMOUNT      INCOME      AMOUNT      INCOME      AMOUNT      INCOME
                                               ---------  -----------  ---------  -----------  ---------  -----------
<S>                                            <C>        <C>          <C>        <C>          <C>        <C>
Tax provision based on the federal statutory
  rate.......................................  $   3,980        35.0%  $  19,442        35.0%  $   5,852        35.0%
State and local income taxes--net of federal
  income tax benefit.........................        705         6.2       3,000         5.4       1,053         6.3
Non-deductible and other.....................        443         3.9       1,113         2.0       1,627         9.7
                                               ---------         ---   ---------         ---   ---------         ---
Provision for income taxes...................  $   5,128        45.1%  $  23,555        42.4%  $   8,532        51.0%
                                               ---------         ---   ---------         ---   ---------         ---
                                               ---------         ---   ---------         ---   ---------         ---
</TABLE>
 
    The deferred tax assets and liabilities result from timing differences in
the recognition of certain income and expense items for financial and tax
accounting purposes. The sources of these differences and the related tax
effects were as follows (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                         ----------------------------------------------
                                                  1996                    1997
                                         ----------------------  ----------------------
                                          ASSETS    LIABILITIES   ASSETS    LIABILITIES
                                         ---------  -----------  ---------  -----------
<S>                                      <C>        <C>          <C>        <C>
Accrued expenses.......................  $  17,882   $      --   $  18,280   $      --
Allowance for doubtful accounts........     11,036          --       8,632          --
Inventory reserves and adjustments.....         --      13,795          --      16,852
Depreciation and amortization..........         --      43,798          --      41,588
Reserve for stock option
  compensation.........................         --          --      16,792          --
Other..................................      6,915          --       5,720          --
                                         ---------  -----------  ---------  -----------
Total..................................  $  35,833   $  57,593   $  49,424   $  58,440
                                         ---------  -----------  ---------  -----------
                                         ---------  -----------  ---------  -----------
</TABLE>
 
                                      F-26
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
14. INCOME TAXES (CONTINUED)
    In the Consolidated Balance Sheets, these deferred assets and liabilities
are classified on a net basis as current and non-current based on the
classification of the related asset or liability or the expected reversal date
of the temporary difference.
 
15. SUPPLEMENTAL CASH FLOW INFORMATION
 
    In addition to the information provided in the Consolidated Statements of
Cash Flows, the following are supplemental disclosures of cash flow information
for the years ended December 31, 1995, 1996 and 1997 (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                                 1995       1996       1997
                                                               ---------  ---------  ---------
<S>                                                            <C>        <C>        <C>
Cash paid during the year for:
  Interest...................................................  $  36,120  $  52,871  $  49,279
  Income taxes...............................................      8,171     17,482     13,663
</TABLE>
 
    The following are supplemental disclosures of noncash investing and
financing activities for the years ended December 31, 1995, 1996 and 1997
(dollars in thousands):
 
    - On March 30, 1995, the Company issued stock valued at $2,162 in exchange
      for services related to financing the Acquisition.
 
    - On May 3, 1995, the Company issued stock valued at $2,406 in exchange for
      services related to the issuance of the Notes.
 
16. FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The estimated fair value of the Company's financial instruments are as
follows (dollars in thousands):
 
<TABLE>
<CAPTION>
                                                       DECEMBER 31, 1996     DECEMBER 31, 1997
                                                      --------------------  --------------------
                                                      CARRYING     FAIR     CARRYING     FAIR
                                                       AMOUNT      VALUE     AMOUNT      VALUE
                                                      ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>
Cash and cash equivalents...........................  $  10,619  $  10,619  $  12,367  $  12,367
Current maturities of long-term obligations and
  capital lease.....................................     46,923     46,923     44,267     44,267
Long-term debt and capital lease:
  Notes.............................................    150,000    168,000    100,000    114,750
  All other.........................................    403,079    403,079    392,868    392,868
Interest rate collar................................         --      1,200         --        387
</TABLE>
 
    The fair value of the Notes and interest rate collar are based on quoted
market prices and quotes from counterparties, respectively.
 
17. SUBSEQUENT EVENT
 
    The Company announced on February 10, 1998 that its subsidiary, USSC, signed
a definitive purchase agreement with Abitibi-Consolidated Inc. to acquire the
U.S. and Mexican operations of its Office Products Division, a specialty
wholesale division of computer consumables, peripherals and accessories.
 
                                      F-27
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
17. SUBSEQUENT EVENT (CONTINUED)
The purchase price is anticipated to be approximately $110.0 million. The
proposed transaction involves three of the five business units of the Office
Products Division, including: Azerty (U.S. and Mexico); Positive ID (which
distributes bar-code scanning products); and AP Support Services (which provides
outsourcing services in telemarketing, direct response marketing, logistics and
data management services). The Company has filed for antitrust
(Hart-Scott-Rodino) clearance and expects to close the transaction in April 1998
subject to obtaining the necessary approvals and the completion of due
diligence.
 
                                      F-28
<PAGE>
                             UNITED STATIONERS INC.
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                      (AUDITED)
                                                                                     DECEMBER 31,   (UNAUDITED)
                                                                                         1997      MARCH 31, 1998
                                                                                     ------------  --------------
<S>                                                                                  <C>           <C>
ASSETS
  Current assets:
    Cash and cash equivalents......................................................   $   12,367    $     11,504
    Accounts receivable, net.......................................................      311,920         282,237
    Inventories....................................................................      511,555         484,911
    Other current assets...........................................................       14,845          15,754
                                                                                     ------------  --------------
      Total current assets.........................................................      850,687         794,406
  Property, plant and equipment, net...............................................      164,543         161,894
  Goodwill, net....................................................................      111,852         111,110
  Other............................................................................       20,939          20,282
                                                                                     ------------  --------------
      Total assets.................................................................   $1,148,021    $  1,087,692
                                                                                     ------------  --------------
                                                                                     ------------  --------------
 
LIABILITIES AND STOCKHOLDERS' EQUITY
  Current liabilities:
    Accounts payable...............................................................   $  236,475    $    235,915
    Accrued liabilities............................................................      118,496         107,616
    Current maturities of long-term debt...........................................       44,267          19,551
                                                                                     ------------  --------------
      Total current liabilities....................................................      399,238         363,082
  Deferred income taxes............................................................       19,383          19,208
  Long-term obligations............................................................      506,092         468,773
                                                                                     ------------  --------------
      Total liabilities............................................................      924,713         851,063
  Stockholders' equity:
    Common stock (voting), $0.10 par value; 40,000,000 authorized; 15,905,273 and
      16,024,019, respectively, issued and outstanding.............................        1,591           1,602
    Additional paid-in capital.....................................................      213,042         211,261
    Retained earnings..............................................................        8,675          23,766
                                                                                     ------------  --------------
      Total stockholders' equity...................................................      223,308         236,629
                                                                                     ------------  --------------
      Total liabilities and stockholders' equity...................................   $1,148,021    $  1,087,692
                                                                                     ------------  --------------
                                                                                     ------------  --------------
</TABLE>
 
           See notes to condensed consolidated financial statements.
 
                                      F-29
<PAGE>
                             UNITED STATIONERS INC.
                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                              THREE MONTHS ENDED
                                                                                                  MARCH 31,
                                                                                            ----------------------
                                                                                               1997        1998
                                                                                            ----------  ----------
<S>                                                                                         <C>         <C>
Net sales.................................................................................  $  635,021  $  712,517
Cost of goods sold........................................................................     526,279     589,455
                                                                                            ----------  ----------
Gross profit..............................................................................     108,742     123,062
Operating expenses
  Warehousing, marketing and administrative expenses......................................      76,704      85,037
                                                                                            ----------  ----------
Income from operations....................................................................      32,038      38,025
Interest expense..........................................................................      14,661      11,826
                                                                                            ----------  ----------
Income before income taxes................................................................      17,377      26,199
Income taxes..............................................................................       7,368      11,108
                                                                                            ----------  ----------
Net income................................................................................      10,009      15,091
Preferred stock dividends issued and accrued..............................................         455      --
                                                                                            ----------  ----------
Net income attributable to common stockholders............................................  $    9,554  $   15,091
                                                                                            ----------  ----------
                                                                                            ----------  ----------
Net income per share......................................................................  $     0.78  $     0.94
                                                                                            ----------  ----------
                                                                                            ----------  ----------
Average number of common shares...........................................................      12,205      15,995
                                                                                            ----------  ----------
                                                                                            ----------  ----------
Net income per common share--assuming dilution............................................  $     0.65  $     0.88
                                                                                            ----------  ----------
                                                                                            ----------  ----------
Average number of common shares--assuming dilution........................................      14,608      17,098
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>
 
           See notes to condensed consolidated financial statements.
 
                                      F-30
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                              THREE MONTHS ENDED
                                                                                                  MARCH 31,
                                                                                            ----------------------
                                                                                               1997        1998
                                                                                            ----------  ----------
<S>                                                                                         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income................................................................................  $   10,009  $   15,091
Depreciation and amortization.............................................................       6,534       7,433
Transaction costs and other amortization..................................................       1,179         930
Changes in operating assets and liabilities...............................................      31,206      44,046
                                                                                            ----------  ----------
  Net cash provided by operating activities...............................................      48,928      67,500
 
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures......................................................................      (1,642)     (3,984)
Proceeds from disposition of property, plant and equipment................................          30           9
                                                                                            ----------  ----------
  Net cash used in investing activities...................................................      (1,612)     (3,975)
 
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of debt................................................................     (29,417)    (29,934)
Net repayments under revolver.............................................................     (11,000)    (32,000)
Payment of employee withholding tax related to stock option exercises.....................      --          (2,571)
Issuance of common shares.................................................................      --             243
Other.....................................................................................          66        (126)
                                                                                            ----------  ----------
  Net cash used in financing activities...................................................     (40,351)    (64,388)
                                                                                            ----------  ----------
 
Net change in cash and cash equivalents...................................................       6,965        (863)
Cash and cash equivalents, beginning of period............................................      10,619      12,367
                                                                                            ----------  ----------
  Cash and cash equivalents, end of period................................................  $   17,584  $   11,504
                                                                                            ----------  ----------
                                                                                            ----------  ----------
 
Other Cash Flow Information:
  Cash payments during the three month period for:
  Income taxes paid.......................................................................  $      349  $      742
  Interest paid...........................................................................       8,340      10,424
</TABLE>
 
           See notes to condensed consolidated financial statements.
 
                                      F-31
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
 
                                  (UNAUDITED)
 
1. BASIS OF PRESENTATION
 
    The accompanying condensed consolidated financial statements are unaudited,
except for the Consolidated Balance Sheet as of December 31, 1997. These
financial statements have been prepared in accordance with 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. In the opinion of the Company's
management, the condensed consolidated financial statements for the unaudited
interim periods presented include all adjustments necessary to fairly present
the results of such interim periods and the financial position as of the end of
said periods. These adjustments were of a normal recurring nature and did not
have a material impact on the financial statements presented. Certain interim
expense and inventory estimates are recognized throughout the fiscal year
relating to marginal income tax rates, shrinkage, price changes and product mix.
Any refinements to these estimates based on actual experience are recorded when
known.
 
2. OPERATIONS
 
    The Company is a national wholesale distributor of business products. The
Company offers approximately 35,000 items from more than 550 manufacturers. This
includes a broad spectrum of office products, computer supplies, office
furniture and facilities management supplies. The Company primarily serves
commercial and contract office products dealers. Its customers include more than
20,000 resellers--such as computer products resellers, office furniture dealers,
mass merchandisers, sanitary supply distributors, warehouse clubs, mail order
houses and office products superstores. The Company has a distribution network
of 64 Regional Distribution Centers. Through its integrated computer system, the
Company provides a high level of customer service and overnight delivery.
 
3. COMPREHENSIVE INCOME
 
    As of January 1, 1998, the Company adopted Financial Accounting Standards
Board Statement 130, "Reporting Comprehensive Income." Statement 130 establishes
new rules for the reporting and display of comprehensive income and its
components; however, the adoption of this Statement had no impact on the
Company's net income or stockholders' equity. Statement 130 requires foreign
currency translation adjustments, which prior to adoption were included in
stockholders' equity, to be included in other comprehensive income.
 
    During the first quarter of 1998 and 1997, total comprehensive income
amounted to $14,968,000 and $9,982,000, respectively.
 
4. NET INCOME PER COMMON AND COMMON EQUIVALENT SHARE
 
    Net income per common share is based on net income after preferred stock
dividend requirements. Basic earnings per share is calculated on the weighted
average number of common shares outstanding. Diluted earnings per share is
calculated on the weighted average number of common and common equivalent shares
outstanding during the period. Stock options and warrants are considered to be
common equivalent shares.
 
                                      F-32
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
        NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
4. NET INCOME PER COMMON AND COMMON EQUIVALENT SHARE (CONTINUED)
    The following table sets forth the computation of basic and diluted earnings
per share (in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                                                                   MARCH 31,
                                                                                              --------------------
                                                                                                1997       1998
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
NUMERATOR:
  Net income................................................................................  $  10,009  $  15,091
  Preferred stock dividends.................................................................        455     --
                                                                                              ---------  ---------
  Numerator for basic and diluted earnings per share--
    Net income attributable to common stockholders..........................................  $   9,554  $  15,091
                                                                                              ---------  ---------
                                                                                              ---------  ---------
DENOMINATOR:
  Denominator for basic earnings per share--
    Weighted average shares.................................................................     12,205     15,995
  Effect of dilutive securities:
    Employee stock options..................................................................      1,001      1,103
    Warrants................................................................................      1,402     --
                                                                                              ---------  ---------
  Dilutive potential common shares..........................................................      2,403      1,103
                                                                                              ---------  ---------
  Denominator for diluted earnings per share--
    Adjusted weighted average shares and assumed conversions................................     14,608     17,098
                                                                                              ---------  ---------
                                                                                              ---------  ---------
Basic earnings per share....................................................................  $    0.78  $    0.94
                                                                                              ---------  ---------
                                                                                              ---------  ---------
Diluted earnings per share..................................................................  $    0.65  $    0.88
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>
 
5. SUBSEQUENT EVENTS
 
AZERTY ACQUISITION
 
    On April 3, 1998, the Company completed the acquisition of all of the
capital stock of Azerty Incorporated, Azerty de Mexico, S.A. de C.V., Positive
ID Wholesale Inc., and AP Support Services Incorporated (collectively, the
"Azerty Acquisition"), which together comprised substantially all of the United
States and Mexican operations of the Office Products Division of
Abitibi-Consolidated Inc. (collectively, the "Azerty Business"). The aggregate
purchase price paid by the Company for the Azerty Business was approximately
$115.1 million (including fees and expenses) following an initial post-closing
adjustment, and subject to final audit and review by the Company. The Azerty
Business is primarily a specialty wholesaler of computer consumables,
peripherals and accessories in the United States and Mexico. It is currently
anticipated that the Company's existing Micro United division will be integrated
into the Azerty Business.
 
    The purchase price for the Azerty Business was funded from borrowings under
the Company's New Credit Facilities (as defined).
 
                                      F-33
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
        NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
5. SUBSEQUENT EVENTS (CONTINUED)
THE NEW CREDIT FACILITIES
 
    On April 3, 1998, in order to fund the purchase price of the Azerty
Business, refinance borrowings under the Company's then-existing senior secured
credit facilities, and pay related fees and expenses in connection therewith,
the Company amended and restated its existing credit agreement (as amended and
restated, the "New Credit Agreement") governing its senior secured credit
facilities (the "New Credit Facilities"). The New Credit Facilities initially
consisted of a $250.0 million six-year revolving credit facility (the "Revolving
Credit Facility"), a $150.0 million six-year tranche A term loan facility (the
"Tranche A Term Loan Facility"), and a $100.0 million six and three-quarter year
tranche B term loan facility (the "Tranche B Term Loan Facility"). The net
proceeds of the Notes Offering (as defined) were used to permanently repay a
substantial portion of indebtedness outstanding under the Tranche B Term Loan
Facility and the remainder of such facility was permanently repaid with proceeds
from the sale of certain receivables, following which the Tranche B Term Loan
Facility was terminated. As a result of the early retirement of the Existing
Credit Facilities, approximately $9.5 million ($5.7 million net of tax benefit
of $3.8 million) of unamortized financing fees will be expensed as a non-cash
extraordinary charge during the second quarter of 1998.
 
RECEIVABLES SECURITIZATION PROGRAM
 
    On April 3, 1998, in connection with the refinancing of its Existing Credit
Facilities, the Company entered into a $163.0 million 364-day liquidity facility
(the "Receivables Securitization Program"), pursuant to which the Company sells
certain of its U.S. dollar trade receivables to a wholly-owned offshore
bankruptcy-remote subsidiary of the Company (the "Receivables Company"). The
Receivables Company then transfers the Eligible Receivables to a third-party,
multi-seller asset-backed commercial paper program existing solely for the
purpose of issuing commercial paper rated A-1/P-1 or higher. The Company
received approximately $160.0 million proceeds from the initial sale of Eligible
Receivables on April 3, 1998.
 
    The proceeds to the Company from the Receivables Securitization Program were
used to reduce borrowings under the Revolving Credit Facility and a portion of
the Tranche B Term Loan Facility.
 
THE NOTES OFFERING
 
    On April 15, 1998, USSC consummated the sale (the "Notes Offering") of
$100.0 million of its 8 3/8% Senior Subordinated Notes due 2008 (the "8 3/8%
Notes") in a transaction not subject to the registration requirements of the
Securities Act of 1933. The 8 3/8% Notes were immediately resold by the initial
purchasers thereof in reliance on Rule 144A under the Securities Act of 1933.
The aggregate net proceeds to the Company (aggregating approximately $97.0
million) from the sale of the 8 3/8% Notes were used to repay a substantial
portion of the indebtedness outstanding under the Tranche B Term Loan Facility.
 
COMPUTER SERVICES CONTRACT WRITE-OFF
 
    As a condition to the spinoff of ASI from the Wholesale Division of Boise
Cascade Office Products Corporation in January 1992, ASI entered into the
Computer Services Contract with a third party service provider to perform
certain computer services.
 
                                      F-34
<PAGE>
                    UNITED STATIONERS INC. AND SUBSIDIARIES
 
        NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
5. SUBSEQUENT EVENTS (CONTINUED)
    Upon completion of the systems integration between USSC and ASI, increasing
differences in the operating processes and technical environment between the
Company and the third-party service provider, became evident. The Computer
Services Contract was modified to allow the Company, at its discretion, not to
perform any processing at the third-party service provider's facilities.
Accordingly, the related fees were reduced. Payments made to the third-party
service provider subsequent to this final renegotiation were effectively for
disaster recovery purposes only. The Company has recently consolidated its
disaster recovery services under an agreement with another third-party service
provider. In May 1998, the Company completed an assessment of the future utility
of the Computer Services Contract. Based upon such assessment, the Company has
determined that it is no longer feasible to use the prior third-party service
provider for disaster recovery purposes.
 
    In May 1998, the Company will write off the remaining term of the Computer
Services Contract. As a result, the Company will record a non-recurring charge
of $13.9 million ($8.3 million net of tax benefit of $5.6 million), which
includes a $2.6 million prepaid expense and $11.3 million of future payments.
 
                                      F-35
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY, THE SELLING
STOCKHOLDERS OR THE UNDERWRITERS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER
TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE SHARES BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED, OR IN WHICH
THE PERSON MAKING THE OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO ANY
PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. UNDER NO
CIRCUMSTANCES SHALL THE DELIVERY OF THIS PROSPECTUS OR ANY SALE MADE PURSUANT TO
THIS PROSPECTUS CREATE ANY IMPLICATION THAT INFORMATION CONTAINED IN THIS
PROSPECTUS IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF THIS PROSPECTUS.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information.....................................................    3
Incorporation of Certain Documents by Reference...........................    3
Prospectus Summary........................................................    5
Risk Factors..............................................................   13
Recent Transactions.......................................................   19
Use of Proceeds...........................................................   22
Price Range of Common Stock and Dividend Policy...........................   22
Capitalization............................................................   23
Selected Consolidated Financial Data......................................   24
Unaudited Consolidated Pro Forma Financial Statements.....................   27
Management's Discussion and Analysis of Financial Condition and Results of
  Operations..............................................................   39
Business..................................................................   49
Management................................................................   60
Principal and Selling Stockholders........................................   64
Shares Eligible for Future Sale...........................................   68
Description of Capital Stock..............................................   69
Description of Certain Indebtedness.......................................   72
Underwriting..............................................................   76
Legal Matters.............................................................   78
Experts...................................................................   78
Index to Financial Statements.............................................  F-1
</TABLE>
 
                                2,005,507 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                            BEAR, STEARNS & CO. INC.
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
                           MORGAN STANLEY DEAN WITTER
 
                                  CLEARY GULL
                            REILAND & MCDEVITT INC.
 
                                 JUNE 10, 1998
 
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