Under the Securities Exchange Act of 1934
(Amendment No. 4)*

Berkshire Hathaway Inc.

(Name of Issuer)

Class B Common Stock, $0.1667 Par Value

(Title of Class of Securities)

084670207

(CUSIP Number)

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

March 2, 2009

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. o

Note : Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

* 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 disclosures provided in a prior cover page.

The information required on 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).

(1) Cascade Investment, L.L.C. (“Cascade”) beneficially owns 4,050 shares of Berkshire Hathaway Inc. (the “Issuer”) Class A common stock (“Class A Shares”).  All Class A Shares beneficially owned by Cascade may be deemed to be beneficially owned by William H. Gates III as the sole member of Cascade.  Each Class A Share is convertible, at the option of the holder, into thirty shares of the Issuer’s Class B common stock (“Class B Shares”).  The number of Class B Shares shown above assumes the conversion of the 4,050 Class A Shares beneficially owned by Cascade into 121,500 Class B Shares.  Michael Larson, the Business Manager of Cascade, has voting and investment power with respect to the Class A Shares beneficially owned by Cascade.  Mr. Larson disclaims any beneficial ownership of the Class A Shares beneficially owned by Cascade and Mr. Gates.

(1) William H. Gates III beneficially owns 300 shares of Berkshire Hathaway Inc. (the “Issuer”) Class A common stock (“Class A Shares”) directly and an additional 4,050 Class A Shares through Cascade Investment, L.L.C. (“Cascade”), a limited liability company of which Mr. Gates is the sole member.  Each Class A Share is convertible, at the option of the holder, into thirty shares of the Issuer’s Class B common stock (“Class B Shares”).  The number of Class B Shares shown above assumes the conversion of the 300 Class A Shares held directly by Mr. Gates into 9,000 Class B Shares and the conversion of the 4,050 Class A Shares held by Cascade into 121,500 Class B Shares. Michael Larson, the Business Manager of Cascade, has voting and investment power with respect to the Class A Shares beneficially owned by Cascade.  Mr. Larson disclaims any beneficial ownership of the Class A Shares beneficially owned by Cascade and Mr. Gates.

(2)  The Bill & Melinda Gates Foundation Trust (the “Trust”) beneficially owns 1,315,194 shares of the Issuer’s Class B Shares.  For purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, all Class B Shares beneficially owned by the Trust may be deemed to be beneficially owned by William H. Gates III and Melinda French Gates, as Co-Trustees of the Trust.  Michael Larson has voting and investment power with respect to the Class B Shares beneficially owned by the Trust.  Mr. Larson disclaims any beneficial ownership of the Class B Shares beneficially owned by the Trust or Mr. and Mrs. Gates.

  (1) The Bill & Melinda Gates Foundation Trust (the “Trust”) beneficially owns 1,315,194 shares of Berkshire Hathaway Inc. Class B common stock (“Class B Shares”).  For purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, all Class B Shares beneficially owned by the Trust may be deemed to be beneficially owned by William H. Gates III and Melinda French Gates, as Co-Trustees of the Trust.  Michael Larson has voting and investment power with respect to the Class B Shares beneficially owned by the Trust.  Mr. Larson disclaims any beneficial ownership of the Class B Shares beneficially owned by the Trust or Mr. and Mrs. Gates.

(1)   The Bill & Melinda Gates Foundation Trust (the “Trust”) beneficially owns 1,315,194 shares of Berkshire Hathaway Inc. Class B common stock (“Class B Shares”).  For purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, all Class B Shares beneficially owned by the Trust may be deemed to be beneficially owned by William H. Gates III and Melinda French Gates, as Co-Trustees of the Trust.  Michael Larson has voting and investment power with respect to the Class B Shares beneficially owned by the Trust.  Mr. Larson disclaims any beneficial ownership of the Class B Shares beneficially owned by the Trust or Mr. and Mrs. Gates.

EXPLANATORY STATEMENT

This Amendment No. 4 to Schedule 13D (“Amendment”) relates to the Class B Common Stock, $0.1667 Par Value (“Class B Shares”) of Berkshire Hathaway Inc. (the “Issuer”).  This Amendment is being filed jointly by Cascade Investment, L.L.C. (“Cascade”), the Bill & Melinda Gates Foundation Trust (the “Trust”), William H. Gates III and Melinda French Gates. The foregoing persons are hereinafter sometimes referred to collectively as the “Reporting Persons.”  This Amendment is filed to amend the Items set forth below of the Reporting Persons’ Schedule 13D previously filed with the Securities and Exchange Commission on August 24, 2006, as amended on July 17, 2007, March 20, 2008 and July 3, 2008, by supplementing them with the information set forth herein. Neither the present filing nor anything contained herein shall be construed as an admission that the Reporting Persons constitute a “group” for any purpose and the Reporting Persons expressly disclaim membership in a group.

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.

(1)  This Amendment is being filed jointly by Cascade, the Trust, William H. Gates III and Melinda French Gates pursuant to the Joint Filing Agreement dated August 24, 2006 and included with the signature page to Cascade’s Schedule 13D with respect to the Issuer filed on August 24, 2006, SEC File No. 005-55113, and incorporated by reference herein.

(2)  Duly authorized under Special Power of Attorney appointing Michael Larson attorney-in-fact, dated November 13, 2006, by and on behalf of William H. Gates III and Melinda French Gates, as Co-Trustees of the Trust, filed as Exhibit 99.1 to the Trust’s Amendment No. 3 to Schedule 13G with respect to Coca-Cola FEMSA, S.A. de C.V. on February 13, 2007, SEC File No. 005-52421, and incorporated by reference herein.

(3)  Duly authorized under Special Power of Attorney appointing Michael Larson attorney-in-fact, dated February 3, 2006, by and on behalf of William H. Gates III, filed as Exhibit 99.1 to Cascade’s Amendment No. 2 to Schedule 13G with respect to Arch Capital Group Ltd. on March 7, 2006, SEC File No. 005-45257, and incorporated by reference herein.