CONCENTRIC NETWORK CORP
SC 13D/A, 1998-08-14
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                          SCHEDULE 13D - AMENDMENT #1
                   Under the Securities Exchange Act of 1934

                         CONCENTRIC NETWORK CORPORATION
                                (Name of Issuer)

                    Common Stock, par value $0.001 per share
                         (Title of Class of Securities)

                                  20589R 10 7
                                 (CUSIP Number)

                           William G. von Glahn, Esq.
                   Senior Vice President and General Counsel
                          The Williams Companies, Inc.
                              One Williams Center
                             Tulsa, Oklahoma 74172
                                 (918) 573-2000
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                August 11, 1998
            (Date of Event which Requires Filing of this Statement)

         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box [ ].

                  Note. Schedules filed in paper format shall include a signed
          original and five copies of the schedule, including all exhibits.  See
          Rule 13d-7 for other parties to whom copies are to be sent.

         *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


<PAGE>   2


CUSIP No. 20589R 10 7


(1)      Names of Reporting Persons/S.S. or I.R.S. Identification Nos. of Above 
         Persons (Entities Only)

         Williams Communications Group, Inc.
         I.R.S. Identification No. 73-1462856

(2)      Check the Appropriate Box if a Member of a Group (See Instructions)

         (a)
              -------------------------------------------------------------
         (b)
              -------------------------------------------------------------

(3)      SEC Use Only
                     ------------------------------------------------------ 

(4)      Source of Funds (See Instructions)   WC

(5)      Check Box if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e)
                           ------------------------------------------------

(6)      Citizenship or Place of Organization.  Delaware

<TABLE>
<S>                                 <C>      <C>                      <C>      
                                    (7)      Sole Voting Power:        1,249,236

                                    --------------------------------------------
Number Of Shares Beneficially       (8)      Shared Voting Power:              0
Owned By Each Reporting                                                           
Person With                         --------------------------------------------
                                    (9)      Sole Dispositive Power:   1,249,236

                                    --------------------------------------------
                                    (10)     Shared Dispositive Power:         0

                                    --------------------------------------------
</TABLE>

(11)     Aggregate Amount Beneficially Owned by Each Reporting Person.

         In addition to the 1,249,236 Shares Purchaser currently owns, Purchaser
         has rights to acquire additional shares as follows: Pursuant to an
         Amended and Restated Common Stock Purchase Warrant dated June 19, 1997,
         Purchaser has the right to acquire an additional 63,351 shares of
         common stock of Issuer. Pursuant to a Common Stock Warrant Purchase
         Agreement dated August 6, 1997, Purchaser has the right to acquire an
         additional 291,667 shares of common stock of Issuer. In addition,
         pursuant to an Agreement for Purchase and Sale of Services and
         Equipment dated July 25, 1997, (effective August 6, 1997) (the
         "Purchase and Sale Agreement"), Purchaser has the right to obligate the
         Issuer to pay for up to $2,000,000 of services rendered by Purchaser by
         issuing Issuer's common stock, the number shares of which to be
         determined based upon

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         the then-current market price for such common stock (the "Purchase and
         Sale Agreement Shares").

(12)     Check if the Aggregate Amount in Row (11) Excludes Certain Shares [ ] 
         (See Instructions)

(13)     Percent Of Class Represented By Amount In Row (11)

         11.3 percent (excluding the Purchase and Sale Agreement Shares
         described in the response to Row (11), the number of which is not
         currently known.)

(14)     Type of Reporting Person (See Instructions):  CO


ITEM 1.           SECURITY AND ISSUER.

         The class of equity securities to which this Statement on Schedule 13D
relates is the common stock, par value $0.001 per share (the "Common Stock"), of
Concentric Network Corporation, a Delaware corporation (the "Issuer" or the
"Company"), with its principal executive offices located at 10590 North Tantau
Avenue, Cupertino, California 95014.

ITEM 2.           IDENTITY AND BACKGROUND.

         This Statement is being filed by Williams Communications Group, Inc., a
Delaware corporation ("Purchaser"). Purchaser is engaged principally in the
provision of data-, voice-, and video-related products and services; advertising
distribution services; video services and other multimedia services for the
broadcast industry; broadcast facsimile and audio- and video- conferencing
services for businesses; customer premise voice and data equipment, including
installation and maintenance; and network integration and management services.
The principal business and principal executive offices of Purchaser are located
at One Williams Center, Tulsa, Oklahoma 74172.

         During the last five years, Purchaser has not been (i) convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors) or
(ii) a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction resulting in or subjecting Purchaser to a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, Federal or State securities laws or finding any
violation with respect to such laws.

ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         On June 19, 1997, Purchaser loaned Issuer $3 million, evidenced by a 10
percent convertible secured promissory note. This loan converted into shares of
the Issuer's common stock. The source of the remaining funds to purchase the
securities and the source of the funds to make the $3 million loan was working
capital of the Purchaser. In addition, Purchaser has the right to obligate the
issuer to issue up to $2,000,000 of additional common stock (determined

                                   Page 3 of 6

<PAGE>   4



based upon the then-current market price of such common stock) in exchange for
services rendered by Purchaser.

         Purchaser plans to use funds from working capital to make additional
purchases of the Company's common stock on the open market, directly from 
holders of the Company's Common Stock, directly from the Company, or otherwise.

ITEM 4.           PURPOSE OF TRANSACTION.

         Purchaser expects its investment in Issuer, an Internet access
         provider, to be strategically beneficial to Purchaser's existing and
         anticipated telecommunications businesses.

                  (a) Pursuant to an Amended and Restated Common Stock Purchase
         Warrant dated June 19, 1997, Purchaser has the right to acquire an
         additional 63,351 shares of common stock of Issuer. Pursuant to a
         Common Stock Warrant Purchase Agreement dated August 6, 1997, Purchaser
         has the right to acquire an additional 291,667 shares of common stock
         of Issuer. In addition, pursuant to an Agreement for Purchase and Sale
         of Services and Equipment dated July 25, 1997, (effective August 6,
         1997) (the "Purchase and Sale Agreement"), Purchaser has the right to
         obligate the Issuer to pay for up to $2,000,000 of services rendered by
         Purchaser by issuing Issuer's common stock, the number shares of which
         to be determined based upon the then-current market price for such
         common stock (the "Purchase and Sale Agreement Shares").

                      Depending on market and other conditions, Purchaser may
         purchase additional shares of the Company's common stock from time to
         time on the open market, in private transactions, in direct 
         transactions with the Company, or otherwise.

                  (b) So long as Purchaser owns at least five percent of the
         outstanding Common Stock of Issuer, Purchaser is entitled to name a
         nominee of its choice to a seat on the Board of Directors to be
         recommended to the stockholders of Issuer.

                  (c)      None.

                  (d)      None.

                  (e)      None.

                  (f)      None.

                  (g)      None.

                  (h)      None.

ITEM 5.           INTEREST IN SECURITIES OF THE ISSUER.

         (a) The aggregate number of shares beneficially owned by Purchaser is
1,249,236, which represents 8.8 percent of the class of securities identified
pursuant to Item 1 (based upon information provided in the Prospectus of the
Issuer dated August 1, 1997). In addition,

                                   Page 4 of 6

<PAGE>   5



Purchaser has a right to acquire an additional 355,018 shares, which represents
an additional 2.5 percent of the securities. (As described in Item 4(a) above,
Purchaser has the right to acquire additional common stock valued at $2,000,000
based upon the then-current market price; because the number of these shares
cannot be determined at this time, these shares are not included in the
foregoing calculation).

         (b) Purchaser has sole power to vote and to dispose of 1,249,236 shares
of the class of securities identified pursuant to Item 1.

         (c) Purchaser has not effected any transactions in the Common Stock of
Issuer during the past sixty days.

         (d) To the best knowledge of Purchaser, Purchaser has the right to
receive or the power to direct the receipt of dividends from, or the proceeds
from the sale of, the shares held by it.

         (e) Not applicable.

ITEM 6.           CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER.

         The information set forth in "Certain Transaction -- Williams
Transaction" in the Prospectus of the Issuer dated August 1, 1997, is
incorporated herein by reference.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS.

Exhibit  1.       Amended and Restated Common Stock Purchase Warrant dated June
                  19, 1997. (filed as Exhibit 10.4(4) to the Issuer's report on
                  Form 10-Q for the quarterly period ended June 30, 1997, as
                  filed with the Commission on August 14, 1997).

Exhibit  2.       Common Stock and Warrant Purchase Agreement dated July 25, 
                  1997. (filed as Exhibit 10.4(2) to the Issuer's report on Form
                  10-Q for the quarterly period ended June 30, 1997, as filed
                  with the Commission on August 14, 1997).

Exhibit  3.       Agreement for Purchase and Sale of Services and Equipment 
                  dated July 25, 1997. (filed as Exhibit 10.4(5) to the Issuer's
                  report on Form 10-Q for the quarterly period ended June 30,
                  1997, as filed with the Commission on August 14, 1997).


                                   Page 5 of 6

<PAGE>   6




                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                                            Date:    August 14, 1998

                                            WILLIAMS COMMUNICATIONS
                                                 GROUP, INC.

                                            By:    /s/ WILLIAM G. VON GLAHN
                                                   ----------------------------
                                            Name:     William G. von Glahn
                                            Title:    Assistant Secretary





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