Company: WHWK
Filing Date: 2025-03-31
Form Type: 8-K/A
Source: 0001193125-25-068845
Chunk: 0

Company: Whitehawk Therapeutics, Inc.
Filing Date: 2025-03-31
Form: 8-K/A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 25, 2025 WHITEHAWK THERAPEUTICS, INC. (Exact name of registrant as specified in its charter)

| Delaware                     |     | 001-38560               |     | 61-1547850         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -I.R.S. Employer   
 Identification No. |

| 2 Headquarters Plaza East Building, 11th Floor Morristown, New Jersey |     |     07960 |
| (Address of principal executive offices)                              |     | -Zip code |

Registrant’s telephone number, including area code: (551) 321-2234 (Former name or former address, if changed since last report.) Check the appropriate box below if the Form 8-Kfiling 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, par value $0.0001 per share |     | WHWK      |     | 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-2of the Securities Exchange Act of 1934 (§240.12b-2of this chapter). Emerging growth company �