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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 6)*

Encore Acquisition Company
(Name of Issuer)
Common Stock
(Title of Class of Securities)
29255W100
(CUSIP Number)
December 31, 2006
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     o Rule 13d-1(b)

     o Rule 13d-1(c)

     þ Rule 13d-1(d)

* 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 the disclosures provided in a prior cover page.

The information required in 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).

 
 

 

                     
CUSIP No.
  
29255W100 
   Page  
2 
   of   
9 

 

           
1   NAMES OF REPORTING PERSONS:
Red Oak Associates, L.P.
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    75-2758850
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   545,503 (See Note 1)
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   None
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   545,503 (See Note 1)
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    None
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  545,503 (See Note 1)
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  1.01% (based on 54,185,847 shares of common stock outstanding as of December 31, 2006, which includes 328,362 shares of common stock represented by options exercisable within 60 days of December 31, 2006)
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
29255W100 
   Page  
3 
   of   
9 

 

           
1   NAMES OF REPORTING PERSONS:
Red Oak Associates No. 2, L.P.
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    75-2918956
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  5   SOLE VOTING POWER:
     
NUMBER OF   2,001,418 (See Note 1)
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   None
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   2,001,418 (See Note 1)
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    None
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  2,001,418 (See Note 1)
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  3.69% (based on 54,185,847 shares of common stock outstanding as of December 31, 2006, which includes 328,362 shares of common stock represented by options exercisable within 60 days of December 31, 2006)
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
29255W100 
   Page  
4 
   of   
9 

 

           
1   NAMES OF REPORTING PERSONS:
I. Jon Brumley
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
   
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  U.S.
       
  5   SOLE VOTING POWER:
     
NUMBER OF   3,128,980 (See Notes 1 and 2)
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   None
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   3,128,980 (See Notes 1 and 2)
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    None
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  3,128,980 (See Notes 1 and 2)
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  5.77% (based on 54,185,847 shares of common stock outstanding as of December 31, 2006, which includes 328,362 shares of common stock represented by options exercisable within 60 days of December 31, 2006)
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

 

                     
CUSIP No.
  
29255W100 
   Page  
5 
   of   
9 
         
Item 1.
        
 
        
(a)
  Name of Issuer:   Encore Acquisition Company
 
        
(b)
  Address of Issuer’s Principal Executive Offices:   777 Main Street, Suite 1400
 
      Fort Worth, Texas 76102
 
        
Item 2.
        
 
        
(a)
  Name of Person Filing:   Red Oak Associates L.P.,
 
      Red Oak Associates No. 2, L.P.
 
      and Mr. I. Jon Brumley
 
        
(b)
  Address of Principal Business Office:   777 Main Street, Suite 1400
 
      Fort Worth, Texas 76102
 
        
(c)
  Citizenship:   U.S.
 
        
(d)
  Title of Class of Securities:   Common Stock
 
        
(e)
  CUSIP Number:   29255W100
 
        
 
     
Item 3.
  If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:
             
 
  (a)   o   Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
 
            
 
  (b)   o   Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
 
            
 
  (c)   o   Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
 
            
 
  (d)   o   Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).
 
            
 
  (e)   o   An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E).
 
            
 
  (f)   o   An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F).
 
            
 
  (g)   o   A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G).
 
            
 
  (h)   o   A savings association as defined in section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).
 
            
 
  (i)   o   A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3).
 
            
 
  (j)   o   Group, in accordance with § 240.13d-1(b)(1)(ii)(J).

 

 

                     
CUSIP No.
  
29255W100 
   Page  
6 
   of   
9 
     
Item 4.
  Ownership
 
    
 
  (a) — (b)
 
    
 
  Red Oak Associates, L.P.
 
    
 
  The aggregate number of shares of common stock that Red Oak Associates, L.P. owns beneficially is 545,503, which constitutes approximately 1.01% of the outstanding shares of common stock.
 
    
 
  Red Oak Associates No. 2, L.P.
 
    
 
  The aggregate number of shares of common stock that Red Oak Associates No. 2, L.P. owns beneficially is 2,001,418, which constitutes approximately 3.69% of the outstanding shares of common stock.
 
    
 
  I. Jon Brumley
 
    
 
  Because of his position as sole general partner of each of Red Oak Associates, L.P. and Red Oak Associates No. 2, L.P., and because of his individual ownership of shares of common stock and rights to acquire shares of common stock pursuant to options, Mr. Brumley may be deemed to beneficially own 3,128,980 shares of common stock, which constitute in the aggregate approximately 5.77% of the outstanding shares of common stock.
 
    
 
  Note: Percentages are based on 54,185,847 shares of common stock outstanding as of December 31, 2006, which includes 328,362 shares of common stock represented by options exercisable within 60 days of December 31, 2006.
 
    
 
  (c)
 
    
 
  Red Oak Associates, L.P.
 
    
 
  Acting through its sole general partner, Red Oak Associates, L.P. has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 545,503 shares of common stock.
 
    
 
  Red Oak Associates No. 2, L.P.
 
    
 
  Acting through its sole general partner, Red Oak Associates No. 2, L.P. has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 2,001,418 shares of common stock.
 
    
 
  I. Jon Brumley
 
    
 
  In his capacity as sole general partner of each of Red Oak Associates, L.P. and Red Oak Associates No. 2, L.P., Mr. Brumley has sole power to vote or to direct the vote and to dispose or to direct the disposition of 2,546,921 shares of common stock. Mr. Brumley also has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 52,752 shares of common stock.

 

 

                     
CUSIP No.
  
29255W100 
   Page  
7 
   of   
9 
     
 
  Furthermore, Mr. Brumley has the power to vote or to direct the vote of 200,945 shares of restricted common stock. Mr. Brumley is also deemed to beneficially own 328,362 shares of common stock that may be acquired upon the exercise of options that are exercisable within 60 days of December 31, 2006.
 
    
Item 5.
  Ownership of Five Percent or Less of a Class
 
    
 
  Not Applicable.
 
    
Item 6.
  Ownership of More than Five Percent on Behalf of Another Person
 
    
 
  Not Applicable.
 
    
Item 7.
  Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person
 
    
 
  Not Applicable.
 
    
Item 8.
  Identification and Classification of Members of the Group
 
    
 
  See Exhibit I.
 
    
Item 9.
  Notice of Dissolution of Group
 
    
 
  Not Applicable.
 
    
Item 10.
  Certification
 
    
 
  Not Applicable.
 
    Note 1: Mr. I. Jon Brumley is the sole general partner of Red Oak Associates, L.P. and Red Oak Associates No. 2, L.P.
 
    Note 2: Includes (i) 545,503 shares of common stock held by Red Oak Associates, L.P., (ii) 2,001,418 shares of common stock held by Red Oak Associates No. 2, L.P., (iii) direct ownership of 52,752 shares of common stock and 200,945 shares of restricted common stock, and (iv) 328,362 shares of common stock that may be acquired upon the exercise of options that were or would have become exercisable within 60 days of December 31, 2006.

 

 

                     
CUSIP No.
  
29255W100 
   Page  
8 
   of   
9 
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.
         
Dated: February 8, 2007   RED OAK ASSOCIATES, L.P.,
a Delaware limited partnership
 
        
 
  By:   /s/ I. Jon Brumley
 
       
 
      I. Jon Brumley, the sole general partner
 
        
    RED OAK ASSOCIATES NO. 2, L.P.,
a Delaware limited partnership
 
        
 
  By:   /s/ I. Jon Brumley
 
       
 
      I. Jon Brumley, the sole general partner
 
        
    /s/ I. Jon Brumley
     
    I. Jon Brumley

 

 

                     
CUSIP No.
  
29255W100 
   Page  
9 
   of   
9 
EXHIBIT I
JOINT FILING AGREEMENT
     In accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including any and all amendments thereto) with respect to the common stock of Encore Acquisition Company, a Delaware corporation, and further agree that this Joint Filing Agreement shall be included as an exhibit to such joint filings.
     In evidence thereof the undersigned, being duly authorized, hereby execute this Joint Filing Agreement this 8th day of February, 2007.
         
    RED OAK ASSOCIATES, L.P.,
a Delaware limited partnership
 
        
 
  By:   /s/ I. Jon Brumley
 
       
 
      I. Jon Brumley, the sole general partner
 
        
    RED OAK ASSOCIATES NO. 2, L.P.,
a Delaware limited partnership
 
        
 
  By:   /s/ I. Jon Brumley
 
       
 
      I. Jon Brumley, the sole general partner
 
        
    /s/ I. Jon Brumley
     
    I. Jon Brumley