OXY

SEC source: 0001567619-23-003341 · doc1.xml · nonDerivative · entry 3

Champion Christopher O · CIK 0001643753 · VP, CAO and Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,973

F2 · kind: Represents shares of common stock withheld to satisfy tax withholding obligations.

SEC source: 0001567619-23-003341 · doc1.xml · nonDerivative · entry 2

Champion Christopher O · CIK 0001643753 · VP, CAO and Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,112

F1 · kind: Represents shares of common stock received upon the vesting of a performance stock unit award granted under the Issuer's 2015 Long-Term Incentive Plan.

SEC source: 0001567619-23-003341 · doc1.xml · nonDerivative · entry 1

Champion Christopher O · CIK 0001643753 · VP, CAO and Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,078

F1 · kind: Represents shares of common stock received upon the vesting of a performance stock unit award granted under the Issuer's 2015 Long-Term Incentive Plan.

SEC source: 0001567619-23-003339 · doc1.xml · derivative · entry 5

Bennett Peter J. · CIK 0001785303 · Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,694

Underlying: Common Stock · 982 shares

Expires 2027-08-03

F6 · kind: Represents?warrants?withheld?to?satisfy?tax?withholding?obligations.

SEC source: 0001567619-23-003339 · doc1.xml · derivative · entry 4

Bennett Peter J. · CIK 0001785303 · Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,676

Underlying: Common Stock · 2,495 shares

Expires 2027-08-03

F5 · kind: Represents?warrants?received?upon?the?vesting?of?a?performance?stock?unit?award?granted?under?the?Issuer's?2015?Long-Term?Incentive?Plan. The warrants were issued in connection with an anti-dilution adjustment to certain of the Issuer's outstanding long-term incentive awards and were subject to forfeiture if the performance conditions underlying the award were not met.

SEC source: 0001567619-23-003339 · doc1.xml · nonDerivative · entry 2

Bennett Peter J. · CIK 0001785303 · Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 89,307

F3 · kind: Represents?shares?of?common?stock?withheld?to?satisfy?tax?withholding?obligations.

SEC source: 0001567619-23-003339 · doc1.xml · nonDerivative · entry 1

Bennett Peter J. · CIK 0001785303 · Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,948

F1 · kind: Represents shares of common stock received upon the vesting of a performance stock unit award granted under the Issuer's 2015 Long-Term Incentive Plan.

F2 · balance_after: Includes 339 shares acquired through dividend reinvestment.

SEC source: 0001567619-23-001092 · doc1.xml · nonDerivative · entry 2

ONeill Claire · CIK 0001962857 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 724

F2 · kind: Represents shares of common stock withheld to satisfy tax withholding obligations.

SEC source: 0001567619-23-001092 · doc1.xml · nonDerivative · entry 1

ONeill Claire · CIK 0001962857 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,035

F1 · kind: Award of common stock under Occidental Petroleum Corporation's Amended and Restated 2015 Long-Term Incentive Plan.

SEC source: 0001567619-22-019137 · doc1.xml · nonDerivative · entry 2

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,763

F3 · kind: Represents shares of common stock withheld to satisfy tax withholding obligations.

SEC source: 0001567619-22-019137 · doc1.xml · nonDerivative · entry 1

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,856

F1 · kind: Award of common stock under Occidental Petroleum Corporation's Amended and Restated 2015 Long-Term Incentive Plan.

F2 · balance_after: Includes 141 shares acquired between July 2022 and October 2022 through dividend reinvestment.

SEC source: 0001567619-22-018286 · doc1.xml · nonDerivative · entry 1

Kerrigan Sylvia J · CIK 0001474828 · SVP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,587

F1 · kind: Award of restricted stock units (RSUs) pursuant to the Issuer's Amended and Restated 2015 Long-Term Incentive Plan (2015 LTIP). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon vesting. The RSUs will vest in three equal annual installments beginning on October 2, 2023.

SEC source: 0000899243-22-032210 · doc4.xml · nonDerivative · entry 5

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 194,351,650

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $60.7550 to $61.5950. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 8 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.

F3 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F4 · ownership.nature: (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-032210 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 193,159,733

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.9000 to $60.0000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.

F3 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F4 · ownership.nature: (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-032210 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 193,110,619

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.6300 to $59.5000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.

F3 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F4 · ownership.nature: (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-032210 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 192,614,334

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.6700 to $58.5300. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 5 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.

F3 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F4 · ownership.nature: (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-032210 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 189,908,536

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.5200 to $58.1800. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.

F3 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F4 · ownership.nature: (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 7

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 188,366,460

F11 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.8950 to $60.0950. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 11 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 6

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 187,980,991

F10 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.4300 to $59.0000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 10 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 5

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 187,828,440

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.8800 to $59.5000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 9 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 186,711,689

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.8800 to $58.8750. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 8 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 186,274,827

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.8800 to $57.8750. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 186,160,166

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.2650 to $59.0000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-028024 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 183,916,357

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.2650 to $58.2600. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (57,992,040), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (55,296,254), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026302 · doc4a.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 181,684,791

F1 · date: This amendment is filed to correct a clerical error and report the correct transaction date. On July 18, 2022, Berkshire Hathaway Inc. ("Berkshire") filed a Form 4 which inadvertently reported that this transaction had occurred on July 16, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.6300 to $59.7500. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 2 to this Form 4.

F3 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (51,848,391), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F4 · ownership.nature: (Continued from footnote 3) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F5 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F6 · ownership.nature: (Continued from footnote 5) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026238 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 181,684,791

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.6300 to $59.7500. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (51,848,391), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026238 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 181,442,550

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (51,848,391), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026238 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 181,440,150

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.5950 to $58.5100. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (51,848,391), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026238 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 180,294,269

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.9200 to $56.2500. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (51,848,391), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026030 · doc4.xml · nonDerivative · entry 5

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 179,741,891

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.7950 to $57.2500. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 9 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (49,905,491), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026030 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 179,676,692

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.1100 to $57.5000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 8 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (49,905,491), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026030 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 178,094,851

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.1100 to $57.1075. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (49,905,491), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026030 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 177,222,134

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.8050 to $59.9300. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (49,905,491), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-026030 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 177,204,158

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.6900 to $59.6850. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (49,905,491), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 6

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 175,437,745

F10 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.6900 to $59.0000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 10 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 5

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 174,907,231

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.6900 to $58.6850. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 9 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 172,835,130

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.6900 to $57.6850. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 8 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 171,569,503

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.7200 to $59.5000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 170,159,150

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.7200 to $58.7150. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-025723 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 166,676,536

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.7200 to $57.7150. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (45,601,345), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 8

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 163,395,275

F11 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $60.0900 to $60.6650. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 11 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 7

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 162,323,941

F10 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.0900 to $60.0850. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 10 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 6

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 161,185,947

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.0900 to $59.0850. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 9 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 5

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 159,738,627

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.0900 to $58.0850. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 8 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 4

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 158,549,729

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 3

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 158,547,729

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.4800 to $59.4000. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 7 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 156,556,562

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.4800 to $58.4750. The Reporting Persons undertake to provide Occidental, any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 6 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024865 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 155,643,500

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.6800 to $59.2500. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (33,558,875), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024236 · doc4.xml · nonDerivative · entry 2

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 153,508,235

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (23,671,835), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.

SEC source: 0000899243-22-024236 · doc4.xml · nonDerivative · entry 1

BERKSHIRE HATHAWAY INC · CIK 0001067983 · 10% owner

BUFFETT WARREN E · CIK 0000315090 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 153,507,335

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.0200 to $55.5000. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.

F2 · ownership.nature: The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through the following Berkshire subsidiaries: Berkshire Hathaway Life Insurance Company of Nebraska (10,363,000), Berkshire Hathaway Specialty Insurance Company (4,729,000), Columbia Insurance Company (23,671,835), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), Government Employees Insurance Company (18,102,616), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (8,563,100),

F3 · ownership.nature: (Continued from footnote 2) National Indemnity Company (54,758,234), Medical Protective Company (6,945,000), Berkshire Hathaway Homestate Insurance Company (4,402,000), Redwood Fire & Casualty Insurance Company (2,918,000), MLMIC Insurance Company (1,328,000), Old United Casualty Company (342,000), and U.S. Underwriters Insurance Company (70,800).

F4 · ownership.nature: As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,

F5 · ownership.nature: (Continued from footnote 4) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.