OXY

SEC source: 0000899243-22-023601 · 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: 152,713,846

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.3100 to $56.0000. 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 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 (22,877,446), 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: 0000899243-22-023601 · 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: 150,130,752

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $54.3100 to $55.3050. 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 (22,877,446), 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: 0000899243-22-023601 · 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: 148,835,588

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.3500 to $56.5000. 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 (22,877,446), 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: 0000899243-22-023601 · 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: 148,716,073

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.3500 to $56.3450. 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 (22,877,446), 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: 0000899243-22-023601 · 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: 146,787,336

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $54.3500 to $55.3475. 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 (22,877,446), 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: 0001567619-22-012344 · doc1.xml · derivative · entry 9

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,097 shares

Expires 2027-08-03

F6 · price: The price reported in Column 8 is a weighted average price. These warrants were sold in multiple transactions at prices ranging from $47.05 to $47.43, inclusive. The reporting person undertakes to provide to Occidental Petroleum Corporation, any security holder of Occidental Petroleum Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of warrants sold at each separate price within the range set forth above.

SEC source: 0001567619-22-012344 · doc1.xml · derivative · entry 8

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,929

Underlying: Common Stock · 11,465 shares

Expires 2031-02-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: One-third of the 2021 option, representing a right to purchase a total of 34,394 shares of common stock, vested on February 28, 2022, and the remaining unvested portion will vest ratably on February 28, 2023 and 2024.

SEC source: 0001567619-22-012344 · doc1.xml · derivative · entry 7

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,564

Underlying: Common Stock · 95,129 shares

Expires 2030-02-14

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: One-third of the 2020 option, representing a right to purchase a total of 142,693 shares of common stock, vested on each of February 28, 2021 and February 28, 2022, and the remaining unvested portion will vest on February 28, 2023. Anti-dilution adjustments were made to the exercise price and the number of shares of common stock underlying the option in connection with the warrant distribution on August 3, 2020.

SEC source: 0001567619-22-012344 · doc1.xml · nonDerivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,907

SEC source: 0001567619-22-012344 · doc1.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,303

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.17 to $70.62, inclusive. The reporting person undertakes to provide to Occidental Petroleum Corporation, any security holder of Occidental Petroleum Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001567619-22-012344 · doc1.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,303

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.10 to $70.72, inclusive. The reporting person undertakes to provide to Occidental Petroleum Corporation, any security holder of Occidental Petroleum Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001567619-22-012344 · doc1.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,897

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001567619-22-012344 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 138,432

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001567619-22-011957 · doc1.xml · nonDerivative · entry 1

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,997

F1 · kind: As reported on that certain Form 4 filed on behalf of the reporting person on May 20, 2021, the reporting person gifted 30,625 shares of common stock of the issuer to a grantor retained annuity trust (the "GRAT") with an independent trustee on May 19, 2021 for tax and estate planning purposes. On May 26, 2022, in satisfaction of the GRAT's annuity obligation, the reporting person received 1,961 shares of the issuer's common stock.

SEC source: 0000899243-22-017920 · 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: 143,162,392

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.0600 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 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 (13,325,992), 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: 0000899243-22-017920 · 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: 142,976,973

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.9100 to $57.5000. 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 (13,325,992), 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: 0001567619-22-010127 · doc1.xml · nonDerivative · entry 2

CHAZEN STEPHEN I · CIK 0001026545 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 293,777

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

SEC source: 0001567619-22-010127 · doc1.xml · nonDerivative · entry 1

CHAZEN STEPHEN I · CIK 0001026545 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 294,957

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

SEC source: 0001567619-22-010139 · doc1.xml · nonDerivative · entry 1

Shearer Bob · CIK 0001374803 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,231

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

SEC source: 0001567619-22-010137 · doc1.xml · nonDerivative · entry 1

POLADIAN AVEDICK BARUYR · CIK 0001305254 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,957

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

SEC source: 0001567619-22-010135 · doc1.xml · nonDerivative · entry 2

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,293

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

SEC source: 0001567619-22-010135 · doc1.xml · nonDerivative · entry 1

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,340

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

F2 · balance_after: Includes 93 shares acquired between July 2021 and April 2022 through dividend reinvestment.

SEC source: 0001567619-22-010133 · doc1.xml · nonDerivative · entry 2

KLESSE WILLIAM R · CIK 0001019718 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 176,984

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

SEC source: 0001567619-22-010133 · doc1.xml · nonDerivative · entry 1

KLESSE WILLIAM R · CIK 0001019718 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 177,841

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

SEC source: 0001567619-22-010131 · doc1.xml · nonDerivative · entry 1

GUTIERREZ CARLOS M · CIK 0001185943 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,036

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

SEC source: 0001567619-22-010129 · doc1.xml · nonDerivative · entry 2

GOULD ANDREW · CIK 0001194100 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,295

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

SEC source: 0001567619-22-010129 · doc1.xml · nonDerivative · entry 1

GOULD ANDREW · CIK 0001194100 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,152

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

SEC source: 0001567619-22-010125 · doc1.xml · nonDerivative · entry 1

BAILEY VICKY A · CIK 0001295122 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,016

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

SEC source: 0000899243-22-016679 · 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: 142,260,618

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.7800 to $58.0000. 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 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 (13,099,700), 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 (7,887,618),

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: 0000899243-22-016679 · 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: 142,240,118

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.2500 to $58.5450. 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 (13,099,700), 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 (7,887,618),

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: 0000899243-22-016679 · 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: 141,538,492

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.2500 to $58.2450. 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 (13,099,700), 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 (7,887,618),

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: 0000899243-22-016679 · 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: 139,620,473

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.2500 to $57.2450. 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 (13,099,700), 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 (7,887,618),

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: 0000899243-22-016679 · 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: 137,109,516

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.2500 to $56.2450. 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 (13,099,700), 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 (7,887,618),

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: 0001567619-22-007721 · doc1.xml · nonDerivative · entry 1

Hollub Vicki A. · CIK 0001588752 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 467,282

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.225 to $56.25, inclusive. The reporting person undertakes to provide to Occidental Petroleum Corporation, any security holder of Occidental Petroleum Corporation, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

SEC source: 0001567619-22-007436 · doc1.xml · nonDerivative · entry 1

BAILEY VICKY A · CIK 0001295122 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 558

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

SEC source: 0000899243-22-011287 · 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: 136,373,000

F11 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $54.1100 to $54.9350. 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 134,652,637

F10 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $53.1100 to $54.1075. 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 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 131,286,410

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $54.2850 to $54.7600. 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 129,516,605

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $53.2850 to $54.2800. 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 127,577,964

F7 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $52.2850 to $53.2800. 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 125,548,033

F6 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $55.2250 to $55.5000. 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 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 (13,099,700), 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 (2,000,000),

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: 0000899243-22-011287 · 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: 120,171,533

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $54.2250 to $55.2200. 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 (13,099,700), 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 (2,000,000),

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: 0001567619-22-007003 · doc1.xml · nonDerivative · entry 1

POLADIAN AVEDICK BARUYR · CIK 0001305254 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,066

SEC source: 0000899243-22-010798 · doc4.xml · nonDerivative · entry 11

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: 118,270,384

F14 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.7400 to $57.9950. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · doc4.xml · nonDerivative · entry 10

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: 117,091,150

F13 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.7400 to $57.7350. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · doc4.xml · nonDerivative · entry 9

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: 115,964,367

F12 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.3100 to $58.5000. 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 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · 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: 115,841,325

F11 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.3100 to $58.3000. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · 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: 115,299,069

F10 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $58.0300 to $58.5800. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · 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: 114,953,737

F9 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $57.0300 to $58.0200. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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: 0000899243-22-010798 · 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: 105,199,820

F8 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.0300 to $57.0275. 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 (13,099,700), Mount Vernon Fire Insurance Company (2,364,500), National Fire & Marine Insurance Company (6,441,650), United States Liability Insurance Company (2,364,500), GEICO Advantage Insurance Company (4,070,000), GEICO Choice Insurance Company (1,829,000), GEICO Marine Insurance Company (245,000), GEICO Secure Insurance Company (2,000,000), 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).

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, (Continued on footnote 4)

F4 · ownership.nature: 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.