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FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
GEREN PRESTON M III

(Last)(First)(Middle)
ANADARKO PETROLEUM CORPORATION, 1201 LAKE ROBBINS DR.

(Street)
THE WOODLANDSTX77380

(City)(State)(Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
10/06/2009
3. Issuer Name and Ticker or Trading Symbol
ANADARKO PETROLEUM CORP [APC]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 4,860
D
 
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)4. Conversion or Excercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Non-Qualified Stock Option (right to buy) 01/08/2010(1)10/30/2013 Common Stock 5,000 $ 21.4525 D  
Non-Qualified Stock Option (right to buy) 01/25/2010(1)11/16/2014 Common Stock 7,500 $ 33.365 D  
Explanation of Responses:
1. In connection with Mr. Geren's departure from the Board in July 2005, the Board had approved the suspension of the vesting period of Mr. Geren's unvested stock options until the earlier of (1) his re-election to the Board or (2) the fifth anniversary of his date of resignation. Effective October 6, 2009, this "tolling" period for Mr. Geren's unvested stock options of 12,500 shares of Company common stock shall terminate, the vesting period for such options shall recommence, and all other terms and conditions of the original stock option grant remain the same.
Linda Mansker by power of atty. for Preston M. Geren III10/08/2009
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

POWER OF ATTORNEY 

Know all by these presents, that the undersigned hereby 
constitutes and appoints Robert K. Reeves, 
Linda A. Mansker, Amanda M. McMillian
and David L. Siddall, signing singly, the undersigned's 
true and lawful attorney-in-fact to: 

1. execute for and on behalf of the undersigned, in the 
undersigned's capacity as a director of Anadarko Petroleum 
Corporation (the "Company"), Forms ID, 3, 4 and 5, 
pursuant to Section 16(a) of the Securities Exchange Act 
of 1934 and the rules thereunder, and Form 144, pursuant 
to Rule 144 under the Securities Act of 1933 and 
the rules thereunder, if required; and 

2. do and perform any and all acts for and on behalf of 
the undersigned which may be necessary or desirable to 
complete and execute any such Form 3, Form 4, Form 5 or 
Form 144 and timely file such form with the United States 
Securities and Exchange Commission and any stock exchange 
or similar authority; and
 
3. take any other action of any type whatsoever in 
connection with the foregoing which, in the opinion of 
such attorney-in-fact, may be of benefit to, in the best 
interest of, or legally required by, the undersigned, it 
being understood that the documents executed by such 
attorney-in-fact on behalf of the undersigned pursuant to 
this Power of Attorney shall be in such form and shall 
contain such terms and conditions as such attorney-in-fact 
may approve in such attorney-in-fact's discretion.
 
The undersigned hereby grants such attorney-in-fact full 
power and authority to do and perform any and every act 
and thing whatsoever requisite, necessary or proper to be 
done in the exercise of any of the rights and powers 
herein granted, as fully to all intents and purposes as 
the undersigned might or could do if personally present, 
with full power of substitution or revocation, hereby 
ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this 
power of attorney and the rights and powers herein 
granted. The undersigned acknowledges that the foregoing 
attorney-in-fact, in serving in such capacity at the 
request of the undersigned, is not assuming, nor is the 
Company assuming, any of the undersigned's 
responsibilities to comply with Section 16(a) of the 
Securities Exchange Act of 1934 or Rule 144 of the 
Securities Act of 1933. 

This Power of Attorney shall remain in full force and 
effect until the undersigned is no longer a officer of 
the Company unless earlier revoked by the undersigned in a 
signed writing delivered to the foregoing attorneys-in-
fact; provided, however, this Power of Attorney will 
expire immediately upon the termination of employment of 
any attorney-in-fact as to that attorney-in-fact only, but 
not as to any other appointed attorney-in-fact hereunder. 

IN WITNESS WHEREOF, the undersigned has caused this Power 
of Attorney to be executed as of this 6th day of October, 
2009.

/s/Preston M. Geren III


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