FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

CASCADE INVESTMENT LLC 		2. Issuer Name and Ticker or Trading Symbol

Patriot Coal CORP [ PCX ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
_____ Officer (give title below)      __ X __ Other (specify below)
See Footnote (3)
(Last)          (First)          (Middle)

2365 CARILLON POINT 		3. Date of Earliest Transaction (MM/DD/YYYY)

1/29/2010
(Street)

KIRKLAND, WA 98033
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   1/29/2010     J (1)    17421   D $18.01   2391231   (2) D   (3)  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
( 1)  The shares were transferred pursuant to a letter agreement (as amended, the "Letter Agreement"), which provided that certain persons including the reporting persons herein would transfer to Mr. Paul Vining shares of Common Stock in an amount determined as set forth in the Letter Agreement. The foregoing discussion of the Letter Agreement is not intended to be a complete statement of all of the material terms thereof and is qualified in its entirety by the Letter Agreement filed as Exhibit 10.1 to Patriot Coal Corporation's quarterly report on Form 10-Q filed on August 7, 2009 (File No. 001-33466).
( 2)  On August 11, 2008, the Common Stock of Patriot Coal Corporation split 2-for-1, resulting in the reporting persons' acquisition of 1,204,326 additional shares of Common Stock.
( 3)  The reporting persons may be deemed to be a member of a group beneficially owning 10% or more of the Common Stock of the issuer within the meaning of Section 13(d) of the Securities Exchange Act of 1934. The reporting persons disclaim beneficial ownership of all securities other than those reported above, and this report shall not be deemed an admission that such a group exists or that the reporting persons are the beneficial owners of the securities of such group for purposes of Section 16 or for any other purpose.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
CASCADE INVESTMENT LLC
2365 CARILLON POINT
KIRKLAND, WA 98033


See Footnote (3)
GATES WILLIAM H III
ONE MICROSOFT WAY
REDMOND, WA 98052


(1)

Signatures
/s/ Cascade Investment, L.L.C. by Alan Heuberger, Attorney-in-fact for Michael Larson, Business Manager 2/2/2010
** Signature of Reporting Person Date

/s/ Alan Heuberger, Attorney-in-fact for William H. Gates III 2/2/2010
** Signature of Reporting Person Date


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 4(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 control number.
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