OXY

SEC source: 0000797468-25-000021 · wk-form4_1739575084.xml · nonDerivative · entry 2

Simmons Jeff F · CIK 0001977241 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 302,364

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

SEC source: 0000797468-25-000021 · wk-form4_1739575084.xml · nonDerivative · entry 1

Simmons Jeff F · CIK 0001977241 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 319,154

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

SEC source: 0000797468-25-000020 · wk-form4_1739575048.xml · nonDerivative · entry 3

Peterson Robert L · CIK 0001808899 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 269,692

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

SEC source: 0000797468-25-000020 · wk-form4_1739575048.xml · nonDerivative · entry 2

Peterson Robert L · CIK 0001808899 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 293,338

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

SEC source: 0000797468-25-000020 · wk-form4_1739575048.xml · nonDerivative · entry 1

Peterson Robert L · CIK 0001808899 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 270,695

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

SEC source: 0000797468-25-000019 · wk-form4_1739575019.xml · nonDerivative · entry 2

Mathew Sunil · CIK 0001977262 · SVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 191,143

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

SEC source: 0000797468-25-000019 · wk-form4_1739575019.xml · nonDerivative · entry 1

Mathew Sunil · CIK 0001977262 · SVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 207,374

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

SEC source: 0000797468-25-000018 · wk-form4_1739574989.xml · nonDerivative · entry 3

Jackson Richard A. · CIK 0001814606 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 245,681

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

SEC source: 0000797468-25-000018 · wk-form4_1739574989.xml · nonDerivative · entry 2

Jackson Richard A. · CIK 0001814606 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 269,324

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

SEC source: 0000797468-25-000018 · wk-form4_1739574989.xml · nonDerivative · entry 1

Jackson Richard A. · CIK 0001814606 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 246,681

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

SEC source: 0000797468-25-000017 · wk-form4_1739574951.xml · nonDerivative · entry 3

Dillon Kenneth · CIK 0001777012 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 321,842

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

SEC source: 0000797468-25-000017 · wk-form4_1739574951.xml · nonDerivative · entry 2

Dillon Kenneth · CIK 0001777012 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 347,688

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

SEC source: 0000797468-25-000017 · wk-form4_1739574951.xml · nonDerivative · entry 1

Dillon Kenneth · CIK 0001777012 · Senior Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 322,922

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

SEC source: 0000797468-25-000016 · wk-form4_1739574905.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,552

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

SEC source: 0000797468-25-000016 · wk-form4_1739574905.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,549

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

SEC source: 0000797468-25-000016 · wk-form4_1739574905.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,165

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

SEC source: 0000950170-25-018266 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 264,941,431

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $46.6400 to $47.0000. 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: 0000950170-24-138710 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 264,178,414

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $46.1750 to $46.6300. 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: 0000950170-24-138710 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 263,936,708

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $45.1726 to $46.1725. 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: 0000950170-24-138710 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 260,564,399

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $46.8100 to $47.0000. 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 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: 0000950170-24-138710 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 260,189,810

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $45.8100 to $46.8099. 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: 0000950170-24-138710 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 257,758,886

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $45.8000 to $46.5600. 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: 0000797468-24-000155 · wk-form4_1727993006.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,829

F1 · kind: Represents shares of common stock withheld to satisfy tax withholding obligations upon the vesting of previously reported restricted stock units.

SEC source: 0000950170-24-074512 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 255,281,524

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.4800 to $59.9600. 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: 0000950170-24-074512 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 254,947,063

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.1400 to $59.8700. 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: 0000950170-24-074512 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 253,886,410

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.3800 to $60.3700. 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: 0000950170-24-072629 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 252,333,913

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $60.0200 to $60.5000. 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: 0000950170-24-072629 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 251,568,014

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.9800 to $60.6100. 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: 0000950170-24-072629 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 251,168,155

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.7400 to $60.4800. 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: 0000950170-24-071037 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 250,583,605

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.3283 to $60.2300. 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: 0000950170-24-071037 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 249,196,761

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.5500 to $60.1000. 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: 0000950170-24-071037 · ownership.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: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 248,542,468

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $59.4800 to $59.8650. 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: 0000797468-24-000115 · wk-form4_1716339615.xml · derivative · entry 2

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,207 shares

Expires 2027-08-03

SEC source: 0000797468-24-000115 · wk-form4_1716339615.xml · nonDerivative · entry 1

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,740

SEC source: 0000797468-24-000113 · wk-form4_1715124931.xml · nonDerivative · entry 2

BAILEY VICKY A · CIK 0001295122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,647

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

SEC source: 0000797468-24-000113 · wk-form4_1715124931.xml · nonDerivative · entry 1

BAILEY VICKY A · CIK 0001295122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,792

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

SEC source: 0000797468-24-000112 · wk-form4_1715124917.xml · nonDerivative · entry 2

Robinson Kenneth B. · CIK 0001845372 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,717

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

SEC source: 0000797468-24-000112 · wk-form4_1715124917.xml · nonDerivative · entry 1

Robinson Kenneth B. · CIK 0001845372 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,486

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

F2 · balance_after: Includes 48 shares acquired between July 2023 and April 2024 through dividend reinvestment.

SEC source: 0000797468-24-000111 · wk-form4_1715124897.xml · nonDerivative · entry 1

ONeill Claire · CIK 0001962857 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,626

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

F2 · balance_after: Includes 32 shares acquired between July 2023 and April 2024 through dividend reinvestment.

SEC source: 0000797468-24-000110 · wk-form4_1715124879.xml · nonDerivative · entry 1

Shearer Bob · CIK 0001374803 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,931

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

SEC source: 0000797468-24-000109 · wk-form4_1715124866.xml · nonDerivative · entry 2

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,052

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

SEC source: 0000797468-24-000109 · wk-form4_1715124866.xml · nonDerivative · entry 1

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,522

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

F2 · balance_after: Includes 481 shares acquired between July 2023 and April 2024 through dividend reinvestment.

SEC source: 0000797468-24-000108 · wk-form4_1715124853.xml · nonDerivative · entry 1

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,533

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

SEC source: 0000797468-24-000107 · wk-form4_1715124837.xml · nonDerivative · entry 1

POLADIAN AVEDICK BARUYR · CIK 0001305254 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,657

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

SEC source: 0000797468-24-000106 · wk-form4_1715124824.xml · nonDerivative · entry 2

GOULD ANDREW · CIK 0001194100 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,990

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

SEC source: 0000797468-24-000106 · wk-form4_1715124824.xml · nonDerivative · entry 1

GOULD ANDREW · CIK 0001194100 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,155

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

SEC source: 0000797468-24-000105 · wk-form4_1715124810.xml · nonDerivative · entry 2

KLESSE WILLIAM R · CIK 0001019718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 182,989

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

SEC source: 0000797468-24-000105 · wk-form4_1715124810.xml · nonDerivative · entry 1

KLESSE WILLIAM R · CIK 0001019718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,844

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

SEC source: 0000797468-24-000079 · wk-form4_1711064059.xml · derivative · entry 2

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,207

Underlying: Common Stock · 625 shares

Expires 2027-08-03

SEC source: 0000797468-24-000079 · wk-form4_1711064059.xml · nonDerivative · entry 1

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,038