Company: OXY-WT
Filing Date: 2025-07-28
Form Type: S-3ASR
Source: 0001628280-25-036198
Chunk: 60

Company: OCCIDENTAL PETROLEUM CORP /DE/
Filing Date: 2025-07-28
Form: S-3ASR
Chunk 60
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 rules and regulations prescribed by the SEC under Section 305(b)(2) of the Trust Indenture Act.

<div align='center'>II-5</div>

### SIGNATURES
Pursuant to the requirements of the Securities Act, Occidental certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, in the State of Texas on July 28, 2025.

| OCCIDENTAL PETROLEUM CORPORATION |     |                  |     |                                       |
| By:                              |     | /s/ Vicki Hollub |     |                                       |
|                                  |     | Name:            |     | Vicki Hollub                          |
|                                  |     | Title:           |     | President and Chief Executive Officer |

<div align='center'>II-6</div>

### POWER OF ATTORNEY
Each person whose signature appears below constitutes and appoints Sylvia Kerrigan and Nicole E. Clark, and each of them, either of whom may act without the joinder of the other, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign the name of each of the undersigned in his or her capacity to any and all amendments (including any post-effective amendments) and supplements to this registration statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the SEC, granting unto such said attorneys-in-fact and agents full power and authority to do and perform each and every act and thing necessary or advisable to be done, as fully to all intents and purposes as the undersigned might or could do in person, and each of the undersigned hereby ratifies and confirms that the said attorneys-in-fact or agents shall do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed below by the following persons in the capacities indicated on July 28, 2025.

| Principal Executive Officer (and Director)              |     | Directors               |
| /s/ Vicki Hollub                                        |     | /s/ Vicky A. Bailey     |
| Vicki Hollub                                            |