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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

## FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 29, 2025

Cardiff Oncology, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware | 001-35558 | 27-2004382
(State or Other Jurisdiction of Incorporation) | (Commission File Number) | (IRS Employer Identification No.)
11055 Flintkote Avenue |
San Diego, California |  | 92121
(Address of Principal Executive Offices) |  | (Zip Code)

Registrant’s Telephone Number, Including Area Code: (858) 952-7570

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock |  | CRDF |  | The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

## Item 2.02 Results of Operations and Financial Condition.

On July 29, 2025, Cardiff Oncology, Inc. (the "Company") issued a press release announcing company highlights and financial results for the second quarter ended June 30, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Form 8-K.

Item 7.01 Regulation FD Disclosure.

On July 29, 2025, the Company plans to present in a conference call presentation materials related to the announcement of positive data from ongoing randomized phase 2 first-line RAS-mutated metastatic colorectal cancer (mCRC) clinical trial CRDF-004. A copy of the presentation materials is furnished as Exhibit 99.2 to this Form 8-K.

The information in this report, including the press release furnished as Exhibit 99.1 hereto, shall not be deemed to be “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. In addition, the exhibit furnished herewith contain statements intended as “forward-looking statements” that are subject to the cautionary statements about forward-looking statements set forth in such exhibit.

Item 8.01 Other Events.

On July 29, 2025, the Company issued a press release (the “Press Release”) announcing positive data from ongoing randomized phase 2 first-line RAS-mutated metastatic colorectal cancer (mCRC) clinical trial CRDF-004. A copy of the press release is attached as Exhibit 99.3 hereto. The information in the Press Release, except for the information set forth in the 2nd paragraph of the Press Release containing a quote by Roger Sidhu, MD, Chief Medical Officer of the Company and the 8th paragraph of the Press Release containing a quote by Mark Erlander, Chief Executive Officer of the Company, is incorporated herein by reference.

## Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

99.1 | Press Release of Cardiff Oncology, Inc. dated July 29, 2025
99.2 | Cardiff Oncology, Inc. Corporate Presentation
99.3 | Press Release of Cardiff Oncology, Inc. dated July 29, 2025

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

|  |  | CARDIFF ONCOLOGY, INC.
Date: | July 29, 2025 | By: | /s/ Mark Erlander
|  |  | Mark Erlander Chief Executive Officer