---------------------------------------------------------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1) BARRETT RESOURCES CORPORATION ------------------------------------------------------------ (Name of Issuer) Common Stock, Par Value $.01 Per Share (including the associated preferred stock purchase rights) ------------------------------------------------------------ (Title of Class and Securities) 068480201 ------------------------------------------------------------ (CUSIP Number) 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 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 ------------------------------------------------------------ (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) July 3, 2001 ------------------------------------------------------------ (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 that is the subject of this Schedule 13D, and is filing this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. [ ] ---------------------------------------------------------------------------- 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 33,479,127 shares issued and outstanding as of the close of business on July 2, 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 33,479,127 shares issued and outstanding as of the close of business on July 2, 2001. The Williams Companies, Inc., a Delaware corporation ("Williams"), and Resources Acquisition Corp., a Delaware corporation and a wholly-owned subsidiary of Williams ("Pur chaser" and together with Williams, the "Reporting Persons"), hereby file this Amendment No. 1 (this "Amendment No. 1") to amend and supplement the Statement on Schedule 13D originally filed on June 15, 2001 by the Reporting Persons (the "Schedule 13D") with respect to the shares ("Shares") of common stock, par value $.01 per Share (including the associated preferred stock purchase rights), of Barrett Resources Corporation, a Delaware corporation ("Barrett Re sources"). The Schedule 13D was originally filed as the Final Amendment to the Schedule TO with respect to the Reporting Persons' Schedule TO with respect to the Shares acquired by Purchaser in a tender offer completed on June 11, 2001. Capitalized terms used but not described herein shall have the meanings ascribed thereto in the Schedule 13D. The Schedule 13D is hereby amended and supplemented by this Amendment No. 1. ITEM 4. PURPOSE OF THE TRANSACTION The response to Item 4 of the Schedule 13D is hereby amended and supplemented to add the following: On July 3, 2001, Williams and Barrett Resources issued a joint press release announcing that the registration statement on Form S-4, which Williams filed on June 15, 2001 with the Securities and Exchange Commission in connection with Williams' proposed merger with Barrett Resources pursuant to the Agreement and Plan of Merger dated as of May 7, 2001, by and among Williams, Purchaser and Barrett Resources, became effective on July 2, 2001. A special meeting of Barrett Resources' stockholders to approve the merger will be held at the Westin Hotel-Tabor Center, 1672 Lawrence Street, Denver, Colorado on Thursday, August 2, 2001 at 9:00 a.m. Denver time. The joint press release issued by Williams and Barrett Resources on July 3, 2001 is filed as Exhibit 99.1 to this Amendment No.1 and is incorporated herein by reference. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS Item 7 is hereby amended by adding the following document as an exhibit: Exhibit 99.1 Joint Press Release issued by Williams and Barrett Resources on July 3, 2001. 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. 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: July 9, 2001 INDEX TO EXHIBITS Exhibit No. Description Exhibit 99.1 Joint Press Release issued by Williams and Barrett Resources on July 3, 2001.