==============================================================================


                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549

                             ------------------


                                SCHEDULE TO
                               (Rule 14d-100)
               Tender Offer Statement Under Section 14(d)(1)
         or Section 13(e)(1) of the Securities Exchange Act of 1934
                    (Amendment No. 5 - Final Amendment)*

                       BARRETT RESOURCES CORPORATION
                     (Name of Subject Company (Issuer))

                        RESOURCES ACQUISITION CORP.
                        a wholly owned subsidiary of
                        THE WILLIAMS COMPANIES, INC.
                    (Names of Filing Persons (Offerors))

                             ------------------


                   Common Stock, Par Value $.01 Per Share
         (Including the associated Preferred Stock Purchase Rights)
                       (Title of Class of Securities)

                             ------------------


                                 068480201
                   (CUSIP Number of Class of Securities)

                         William G. von Glahn, Esq.
                 Senior Vice President and General Counsel
                        The Williams Companies, Inc.
                            One Williams Center
                           Tulsa, Oklahoma 74172
                         Telephone: (918) 573-2000

                   (Name, address and telephone number of
                    person authorized to receive notices
              and communications on behalf of filing persons)
                              With a copy to:

                           Morris J. Kramer, Esq.
                         Richard J. Grossman, Esq.
                  Skadden, Arps, Slate, Meagher & Flom LLP
                             Four Times Square
                             New York, NY 10036
                          Telephone: 212-735-3000

                         CALCULATION OF FILING FEE
==============================================================================
     Transaction Valuation*                         Amount of Filing Fee**
         $1,221,326,646                                    $244,265
______________________________________________________________________________

*    Estimated for purposes of calculating the amount of the filing fee
     only. The amount assumes the purchase of a total of 16,730,502 shares
     of the outstanding Common Stock, par value $0.01 per share, at a price
     per Share of $73.00 in cash. The amount of the filing fee calculated
     in accordance with Rule 0-11 of the Securities Exchange Act of 1934,
     as amended, equals 1/50 of 1% of the transaction value.
**   The filing fee was paid on May 14, 2001.

[_]      Check the box if any part of the fee is offset as provided by Rule
         0-11(a)(2) and identify the filing with which the offsetting fee
         was previously paid. Identify the previous filing by registration
         statement number or the Form or Schedule and the date of its
         filing.

         Amount Previously Paid:    None            Filing party:   N/A
         Form or Registration No.:  N/A             Date Filed:     N/A

[_]      Check the box if the filing relates solely to preliminary
         communications made before the commencement of a tender offer.
Check the appropriate boxes below to designate any transactions to which
the statement relates:

         [X]   third-party tender offer subject to Rule 14d-1.

         [_]   issuer tender offer subject to Rule 13e-4.

         [_]   going-private transaction subject to Rule 13e-3.

         [_]   amendment to Schedule 13D under Rule 13d-2.

         Check the following box if the filing is a final amendment reporting
the results of the tender offer: [X]

         * This final amendment also constitutes the initial filing of the
Schedule 13D of the Filing Persons with respect to the Securities of the
Subject Company purchased by the Filing Persons in the Offer. The
information contained herein and in the Tender Offer Statement on Schedule TO,
as amended, is incorporated by reference for purposes of the initial filing of
the Schedule 13D.
==============================================================================


                                SCHEDULE 13D

     CUSIP No. 068480201
     -----------------------------------------------------------------------
     1.   NAMES OF REPORTING PERSONS/
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) -
          The Williams Companies, Inc.
          IRS Id. No: 73-0569878
         -------------------------------------------------------------------
     2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                           (a)  ( )
                                                           (b)  ( )
     -----------------------------------------------------------------------
     3.   SEC USE ONLY

     -----------------------------------------------------------------------
     4.   SOURCE OF FUNDS*
          BK
     -----------------------------------------------------------------------
     5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
          PURSUANT TO ITEM 2(d) or 2(e)                    (  )

     -----------------------------------------------------------------------
     6.   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
     -----------------------------------------------------------------------
                                      7.   SOLE VOTING POWER
           NUMBER OF                       0
            SHARES                 _________________________________________
         BENEFICIALLY                 8.   SHARED VOTING POWER
           OWNED BY                        16,730,502
             EACH                  _________________________________________
           REPORTING                  9.   SOLE DISPOSITIVE POWER
            PERSON                         0
             WITH                  _________________________________________
                                     10.   SHARED DISPOSITIVE POWER
                                           16,730,502
     -----------------------------------------------------------------------
     11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                           16,730,502
     -----------------------------------------------------------------------
     12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN
          SHARES                                        (  )
     -------------------------------------------------------------------
     13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                                   50.0%(1)
     -------------------------------------------------------------------
     14.  TYPE OF REPORTING PERSON
          CO


- ------------------------
(1)  Based on the 33,461,004 shares issued and outstanding as of the
     close of business on May 3, 2001.




SCHEDULE 13D

     CUSIP No.  068480201
     -----------------------------------------------------------------------
     1.   NAMES OF REPORTING PERSONS/
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)
          Resources Acquisition Corp.
          IRS Id. No:  73-1613076
         -------------------------------------------------------------------
     2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                           (a)  ( )
                                                           (b)  ( )
     -------------------------------------------------------------------
     3.   SEC USE ONLY

     -------------------------------------------------------------------
     4.   SOURCE OF FUNDS*
          AF
     -------------------------------------------------------------------
     5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
          PURSUANT TO ITEM 2(d) or 2(e)                    (  )

     -------------------------------------------------------------------
     6.   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
     -------------------------------------------------------------------
                                      7.   SOLE VOTING POWER
           NUMBER OF                       0
            SHARES                 _____________________________________
         BENEFICIALLY                 8.   SHARED VOTING POWER
           OWNED BY                        16,730,502
             EACH                  _____________________________________
           REPORTING                  9.   SOLE DISPOSITIVE POWER
            PERSON                         0
             WITH                  _____________________________________
                                     10.   SHARED DISPOSITIVE POWER
                                           16,730,502
     -------------------------------------------------------------------
     11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                           16,730,502
     -------------------------------------------------------------------
     12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN
          SHARES                                        (  )
     -------------------------------------------------------------------
     13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                                   50.0%(1)
     -------------------------------------------------------------------
     14.  TYPE OF REPORTING PERSON
          CO



- ----------------
(1)      Based on the 33,461,004 shares issued and outstanding as of the
         close of business on May 3, 2001.



         This Amendment No. 5 is the final amendment to the Tender Offer
Statement on Schedule TO (the "Schedule TO"), filed initially with the
Securities and Exchange Commission on May 14, 2001, relating to the offer
by Resources Acquisition Corp. ("Purchaser"), a Delaware corporation and a
wholly-owned subsidiary of The Williams Companies, Inc., a Delaware
corporation ("Williams"), to purchase 16,730,502 shares of the common
stock, par value $0.01 per share (including the associated preferred stock
purchase rights, the "Shares") of Barrett Resources Corporation, a Delaware
corporation ("Barrett Resources"), at $73.00 per Share, net to the seller
in cash, upon the terms and subject to the conditions set forth in the
Offer to Purchase and the accompanying Letter of Transmittal, each dated
May 14, 2001, of Purchaser previously filed as exhibits (a)(1) and (a)(2),
respectively, to the Schedule TO.


Item 8.  Interest in Securities of the Subject Company.

         Item 8 of the Schedule TO, which incorporates by reference certain
information contained in the Offer to Purchase, is hereby amended and
supplemented as follows:

          A total of 30,004,303 Shares were validly tendered and not
withdrawn in the Offer, including Shares for which certificates were
delivered to the Depositary pursuant to the Offer's guaranteed delivery
procedure. Purchaser previously accepted for payment 16,730,502 Shares on
June 12, 2001. In accordance with the terms of the Offer, Williams has been
informed by the Depositary that the final proration factor for the Offer is
55.76%. Following purchase of the Shares, Purchaser is the record owner of
approximately 50% of the outstanding Shares.

         On June 15, 2001, Williams issued a press release announcing the
final results and proration factor for the Offer, a copy of which is filed
as Exhibit (a)(13) to this Amendment No. 5 and is incorporated herein by
reference.

Item 11. Additional Information.

         Item 11 of the Schedule TO, which incorporates by reference
certain information contained in the Offer to Purchase, is hereby amended
and supplemented as follows:

         On June 15, 2001, Williams issued the press release
included as Exhibit (a)(13) hereto. The information set forth in the press
release is incorporated herein by reference.


Item 12.  Exhibits.

         Item 12 of the Schedule TO is hereby amended and supplemented by
including the following information:

         (a)(13)  Press Release issued by Williams on June 15, 2001.



                                 SIGNATURE

         After due 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.

                                      RESOURCES ACQUISITION CORP.


                                      By:  /s/ Ralph A. Hill
                                          -----------------------------------
                                      Name:  Ralph A. Hill
                                      Title: Senior Vice President


                                      THE WILLIAMS COMPANIES, INC.


                                      By:  /s/ Keith E. Bailey
                                          -----------------------------------
                                      Name:  Keith E. Bailey
                                      Title: Chairman, President and
                                             Chief Executive Officer


Dated: June 15, 2001



                               EXHIBIT INDEX
                               -------------

Exhibit
No.                        Description

(a)(13)           Press Release issued by Williams on June 15, 2001



                                                           Exhibit (a)(13)

- ------------------------------------------------------------------------------
[GRAPHIC OMITTED][GRAPHIC OMITTED]
- ------------------------------------------------------------------------------
News Release

NYSE:WMB




Date:     June 15, 2001

                                                                             
Contact:    Kathleen Eccleston-Bickell                 Rick Rodekohr                 Richard George
            Williams (media relations)                 Williams (investor            Williams (investor relations)
                                                       relations)
            (918) 573-1316                             (918) 573-2087                (918) 573-3679
            kathleen.eccleston-bickell@williams.com    rick.rodekohr@williams.com    richard.george@williams.com



         Williams Announces Final Proration Factor for Barrett Resources
Tender Offer

         TULSA, Okla. - Williams (NYSE: WMB) announced today the final
proration factor in its tender offer for 16,730,502 shares of common stock
of Barrett Resources Corporation (NYSE: BRR). The final proration factor
for the tender offer is 55.76 percent; 30,004,303 shares of Barrett
Resources common stock were validly tendered and not withdrawn in the offer
after giving effect to proper delivery of shares tendered pursuant to the
notice of guaranteed delivery procedure. Williams had announced the
preliminary results of the offer on June 12, 2001.
         Williams purchased 16,730,502 Barrett shares in the tender offer,
which expired at midnight Eastern time on Monday, June 11, 2001. The shares
purchased represent 50 percent of the approximately 33.5 million Barrett
shares outstanding prior to the offer. The depositary for the offer will
promptly issue payment of $73 net per share for the shares accepted under
the offer and return to holders all shares not accepted as a result of
proration.
         Williams and Barrett entered into a merger agreement on May 7.
Subject to the satisfaction of certain conditions, the tender offer will be
followed by a merger in which each remaining share of Barrett common stock,
other than shares held by Williams or its subsidiaries, will be exchanged
for 1.767 shares of Williams common stock. The number of Williams shares
received in this exchange by each Barrett stockholder will be rounded to
the nearest whole share, with cash paid to Barrett stockholders in lieu of
any fractional shares otherwise owed. As a result of the merger, Barrett
Resources will become a wholly owned subsidiary of Williams. The merger is
expected to close in the third quarter of 2001.
                                    More

Page 2 of 2/ Williams Announces Final Proration Factor for Barrett Resources
Tender Offer

Additional Information
         This news release is being filed pursuant to Rule 425 under the
Securities Act of 1933. It does not constitute an offer of sale of
securities. Shareholders of Barrett and other investors are urged to read
the proxy statement/prospectus, when available, that will be included in
the registration statement on Form S-4 to be filed by Williams in
connection with the second-step merger. These materials will contain
important information about Barrett, Williams, the merger, the people
soliciting proxies relating to the merger, their interests in the merger
and related matters.
         In addition to the registration statement and the proxy
statement/prospectus to be filed in connection with the merger, Williams
and Barrett file annual, quarterly and special reports, proxy statements
and other information with the SEC. You may read and copy any reports,
statements or other information filed by Barrett Resources or Williams at
the SEC Public Reference Rooms at 450 Fifth St., N.W., Washington, D.C.
20549 or at any of the SEC's other public reference rooms in New York and
Chicago. Please call the SEC at (800) SEC-0330 for further information on
the public reference rooms. Williams' and Barrett's filings with the SEC
are also available to the public from commercial document-retrieval
services and at the web site maintained by the SEC at www.sec.gov. Free
copies of the proxy statement/prospectus, when available, and these other
documents may also be obtained from Williams by directing a request through
the investor relations portion of Williams' website at www.williams.com or
by mail to Williams, One Williams Center, 50th Floor, Tulsa, Okla., 74172,
Attention: Investor Relations, Telephone: (800) 600-3782.

About Williams (NYSE: WMB)
         Williams, through its subsidiaries, connects businesses to energy,
delivering innovative, reliable products and services. Williams information
is available at www.williams.com.
                                    ###

Portions of this document may constitute "forward-looking statements" as
defined by federal law. Although the company believes any such statements
are based on reasonable assumptions, there is no assurance that actual
outcomes will not be materially different. Any such statements are made in
reliance on the "safe harbor" protections provided under the Private
Securities Reform Act of 1995. Additional information about issues that
could lead to material changes in performance is contained in the company's
annual reports filed with the Securities and Exchange Commission.