Company: OXY-WT
Filing Date: 2025-07-28
Form Type: 424B2
Source: 0001628280-25-036238
Chunk: 23

Company: OCCIDENTAL PETROLEUM CORP /DE/
Filing Date: 2025-07-28
Form: 424B2
Chunk 23
---
 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), from the date of this prospectus until the termination of each offering under this prospectus.

Information furnished under Item 2.02 or 7.01 (or corresponding information furnished under Item 9.01 or included as an exhibit) in any past or future current report on Form 8-K (including the current reports on Form 8-K listed above) that we file with the SEC, unless otherwise expressly specified in such report, is not incorporated by reference into this prospectus.

You can obtain any of the documents listed above from the SEC’s website at the address indicated above, or from Occidental by requesting them in writing or by telephone as follows:

#### Occidental Petroleum Corporation

#### Attention: Corporate Secretary

#### 5 Greenway Plaza, Suite 110

#### Houston, Texas 77046

#### Telephone: (713) 215-7000
These documents are available from Occidental without charge, excluding any exhibits to them unless the exhibit is specifically listed as an exhibit to the registration statement of which this prospectus forms a part. You can also find information about Occidental at our internet website at www.oxy.com. Information contained on this website does not constitute part of this prospectus.

You should rely only on the information contained or incorporated by reference into this prospectus, the prospectus supplement or any pricing supplement as having been authorized by us. We have not authorized any person, including any salesperson or broker, to provide information other than that provided in this prospectus, the

<div align='center'>2</div>

prospectus supplement or any pricing supplement. We have not authorized anyone to provide you with different information. We are not making an offer of the securities in any jurisdiction where the offer is not permitted. You should assume that the information in this prospectus and any prospectus supplement or pricing supplement is accurate only as of the date on its cover page and that any information we have incorporated by reference herein or therein is accurate only as of the date of the document incorporated by reference.

<div align='center'>3</div>

### FORWARD-LOOKING STATEMENTS
This prospectus, any accompanying prospectus supplement and the documents incorporated by reference herein and therein contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the