UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G (Under the Securities Exchange Act of 1934 (Amendment No. 23)* Berry Petroleum Company (Name of Issuer) Class A Common Stock (Title of Class of Securities) 085789105 (CUSIP Number) DECEMBER 31, 2010 Date of Event Which Requires Filing of This Statement Check the following box if a fee is being paid with this statement __. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1; and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.) (See Rule 13d-7). *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). Page 1 of 4 pages CUSIP No. 085789105 Page 2 of 4 Pages 1. NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Winberta Holdings, Ltd. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * Not Applicable (a) (b) 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION Alberta, Canada NUMBER OF 5. SOLE VOTING POWER SHARES 3,751,900 BENEFICIALLY 6. SHARED VOTING POWER OWNED Not Applicable BY EACH 7. SOLE DISPOSITIVE POWER REPORTING 3,751,900 PERSON WITH 8. SHARED DISPOSITIVE POWER Not Applicable 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,751,900 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * Not Applicable 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.0% 12. TYPE OF REPORTING PERSON * CO-Corporation *SEE INSTRUCTION BEFORE FILLING OUT! Page 2 of 4 pages Item 1(a). Name of Issuer: Berry Petroleum Company Item 1(b). Address of Issuer's Principal Executive Offices: 1999 Broadway,Suite 3700 Denver, CO 80202 Item 2(a). Name of Person Filing: Winifred Berry Lowell Item 2(b). Address of Principal Business Office or, if none, residence: 1999 Broadway,Suite 3700 Denver, CO 80202 Item 2(c). Citizenship: Canada Item 2(d). Title of Class of Securities: Class A Common Stock Item 2(e). CUSIP Number: 085789105 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: Not Applicable. Item 4. Ownership: (a) Amount Beneficially Owned: 3,751,900 shares (b) Percent of Class: 7.0% Page 3 of 4 pages (c) Number of shares as to which such person has: ( i) Sole power to vote or direct the vote 3,751,900 ( ii) Shared power to vote or direct the vote - (iii) Sole power to dispose or direct the disposition of 3,751,900 ( iv) Shared power to dispose or direct the disposition of - 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: Pursuant to the terms of the Last Will and Testament of C.J. Berry, 37.5% of the dividends declared on 3,527,732 shares owned by Winberta Holdings, Ltd. are payable to C.J. Bennett during his lifetime. 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: Not Applicable 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. January 27, 2011 Date /s/ Kenneth A. Olson Attorney-in-Fact for Winifred Berry Lowell Page 4 of 4 pages