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Form SC 13G/A ULTRA PETROLEUM CORP Filed by: DAVIS SELECTED ADVISERS

February 12, 2016 12:31 PM EST
UNITED STATES 
                        SECURITIES AND EXCHANGE COMMISSION 
                              Washington, D.C. 20549 

                                    SCHEDULE 13G
                      Under the Securities Exchange Act of 1934 
                                  (Amendment No.2)* 


			       Ultra Petroleum Corp.                               
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                                 (Name of Issuer) 

                      
                                  Common Stock
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                        (Title of Class of Securities) 

                                    903914109
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                                 (CUSIP Number) 

                                 December 31, 2015
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            (Date of Event Which Requires Filing of this Statement) 

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

                                [X] Rule 13d-1(b) 

                                [_] Rule 13d-1(c) 

                                [_] 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). 


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  CUSIP No.   903914109               13G
-----------------------

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 1.   Name of Reporting Person
      I.R.S. Identification No. of above Person

      Davis Selected Advisers, L.P.		85-0360310

------------------------------------------------------------------------------
 2.   Check the Appropriate Box if a Member of a Group
                                                                (a) [_]
                                                                (b) [X]
	
------------------------------------------------------------------------------
 3.   SEC Use Only


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 4.   Citizenship or Place of Organization
  
      Colorado Limited Partnership

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                     5.   Sole Voting Power

     Number of                 16,398,507 shares

      Shares        ----------------------------------------------------------
                     6.   Shared or No Voting Power
   Beneficially                        0 (Shared)
                                 482,510 (No Vote)
     Owned by
                    ----------------------------------------------------------
       Each          7.   Sole Dispositive Power

    Reporting                  16,881,017 shares

      Person        ----------------------------------------------------------
                     8.   Shared Dispositive Power
       With:
                                      0

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 9.   Aggregate Amount Beneficially Owned by Each Reporting Person

      16,881,017 shares    

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10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares

                                                                   [_]
      n/a
------------------------------------------------------------------------------
11.   Percent of Class Represented by Amount in Row (9)

      11.0%     

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12.   Type of Reporting Person

      IA
-------------------------------------------------------------------------------
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  CUSIP No.   903914109               
-----------------------

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 1.   Name of Reporting Person
      I.R.S. Identification No. of above Person

      Davis New York Venture Fund		13-2601967

------------------------------------------------------------------------------
 2.   Check the Appropriate Box if a Member of a Group
                                                                (a) [_]
                                                                (b) [X]
	
------------------------------------------------------------------------------
 3.   SEC Use Only


------------------------------------------------------------------------------
 4.   Citizenship or Place of Organization
  
      Maryland Corporation

------------------------------------------------------------------------------
                     5.   Sole Voting Power

     Number of                         0

      Shares        ----------------------------------------------------------
                     6.   Shared Voting Power
   Beneficially		              
                                8,099,342 shares
     Owned by
                    ----------------------------------------------------------
       Each          7.   Sole Dispositive Power

    Reporting                          0 

      Person        ----------------------------------------------------------
                     8.   Shared Dispositive Power
       With:
                                8,099,342 shares

------------------------------------------------------------------------------
 9.   Aggregate Amount Beneficially Owned by Each Reporting Person

      8,099,342 shares     

------------------------------------------------------------------------------
10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares

                                                                   [_]
      n/a
------------------------------------------------------------------------------
11.   Percent of Class Represented by Amount in Row (9)

      5.3%     

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12.   Type of Reporting Person

      IV
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Item 1(a). Name of Issuer: 
           Ultra Petroleum Corp. 

Item 1(b). Address of Issuer's Principal Executive Offices: 
           400 North Sam Houston Parkway East, Suite 1200
	   Houston, TX 77060

Item 2(a) and (b). Names and Principal Business Addresses of Persons Filing: 
          
	(1) Davis Selected Advisers, L.P. 
	    2949 East Elvira Road, Suite 101					
            Tucson, Arizona 85756

	(2) Davis New York Venture Fund
	    c/o Davis Selected Advisers, L.P. 
	    2949 East Elvira Road, Suite 101					
            Tucson, Arizona 85756	
            	
Item 2(c). Citizenship: 

           Davis Selected Advisers, L.P. - Colorado Limited Partnership

	   Davis New York Venture Fund - Maryland Corporation

Item 2(d). Title of Class of Securities: 
           Common Stock 

Item 2(e). CUSIP Number: 
           903914109      

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 
13d-2(b) or (c), check whether the person filing is a : 

(d) Investment Company registered under Sec. 8 of the Investment
    Company Act - Davis New York Venture Fund a series of Davis
    New York Venture Fund, Inc.

(e) Investment Adviser registered under Section 203 of the Investment 
    Advisers Act of 1940.  This statement is being filed by Davis 
    Selected Advisers, L.P. as a registered investment adviser.
    All of the securities covered by this report are owned legally
    by Davis Selected Advisers investment advisory clients and none 
    are owned directly or indirectly by Davis Selected Advisers.  
    As permitted by Rule 13d-4, the filing of this statement shall
    not be construed as an admission that Davis Selected Advisers, L.P. 
    is the beneficial owner of any of the securities covered by this 
    statement.



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Item 4. Ownership. 

(a). Amount beneficially owned: 
See the response(s) to Item 9 on the attached cover page(s). 

(b). Percent of Class: 
See the response(s) to Item 11 on the attached cover page(s). 

(c). Number of shares as to which such person has: 

(i). Sole power to vote or to direct the vote: See the response(s) to Item 5
on the attached cover page(s). 

(ii). Shared or no power to vote or to direct the vote: See the response(s) to 
Item 6 on the attached cover page(s). 

(iii). Sole power to dispose or to direct the disposition of: See the 
response(s) to Item 7 on the attached cover page(s). 

(iv). Shared power to dispose or to direct the disposition of: See the 
response(s) to Item 8 on the attached cover page(s).

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. 
Not Applicable 

Item 8. Identification and Classification of Members of the Group. 
Not Applicable 

Item 9. Notice of Dissolution of Group. 
Not Applicable 

Item 10. Certification. 
By signing below I certify that, to the best of my knowledge and belief, 
the securities referred to above were acquired and are held in the ordinary 
course of business and were not acquired and are not held for the purpose 
of or with the effect of changing or influencing the control of the issuer 
of the securities and were not acquired and are not held in connection with
or as a participant in any transaction having that purpose or effect. 	

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. 

			Davis Selected Advisers, L.P.
	
	BY		/s/ Sharra Haynes			
							
	PRINT		Sharra Haynes
			Vice President	
			
		
	DATE		February 12, 2016

Joint Filing Agreement

In accordance with Rule 13d-1(k) under the Securities Exchange Act
of 1934, the persons or entities named below agree to the joint
filing on behalf of each of them of this Schedule 13G with respect
to the Securities of the Issuer and further agree that this joint
filing agreement be included as an exhibit to this Schedule 13G. In
evidence thereof, the undersigned hereby execute this Agreement as
of February 14, 2015.


			Davis Selected Advisers, L.P.
	
	BY		/s/ Sharra Haynes			
							
	PRINT		Sharra Haynes
			Vice President	
			
		
	DATE		February 12, 2016


			Davis New York Venture Fund
	
	BY		/s/ Ryan Charles			
							
	PRINT		Ryan Charles
			Vice President	
			
		
	DATE		February 12, 2016

 



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