Company: OXY-WT
Filing Date: 2025-07-28
Form Type: S-3ASR
Source: 0001628280-25-036198
Chunk: 0

Company: OCCIDENTAL PETROLEUM CORP /DE/
Filing Date: 2025-07-28
Form: S-3ASR
Chunk 0
---
<div align='center'>As Filed with the Securities and Exchange Commission on July 28, 2025</div>

#### Registration No. 333-

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### FORM S-3

### REGISTRATION STATEMENT

#### UNDER

#### THE SECURITIES ACT OF 1933

### OCCIDENTAL PETROLEUM CORPORATION
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware                          |     | 95-4035997         |
| (State or other jurisdiction      
 of incorporation or organization) |     | -I.R.S. Employer   
 Identification No. |

#### 5 Greenway Plaza, Suite 110

#### Houston, Texas 77046
<div align='center'>(713) 215-7000

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)</div>

#### Nicole E. Clark
<div align='center'>Vice President, Chief Compliance Officer and Corporate Secretary</div>

#### 5 Greenway Plaza, Suite 110

#### Houston, Texas 77046
<div align='center'>(713) 215-7000

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copy to:</div>

#### Craig F. Arcella

#### Douglas Dolan

#### Cravath, Swaine & Moore LLP

#### 2 Manhattan West

#### 375 9th Avenue

#### New York, New York 10001
<div align='center'>(212) 474-1000</div>

Approximate date of commencement of proposed sale to the public : From time to time after the effective date of this registration statement.

If the only securities being registered on this form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering