Company: WHWK
Filing Date: 2025-01-21
Form Type: PREM14A
Source: 0001193125-25-009599
Chunk: 761

Company: Whitehawk Therapeutics, Inc.
Filing Date: 2025-01-21
Form: PREM14A
Chunk 761
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 of the foregoing, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees that, during the Lock-upPeriod, the undersigned will not (and, if the undersigned is a natural person, will cause any Family Member not to), without the prior written consent of Jefferies, which may withhold its consent in its sole discretion:

| • |     | Sell or Offer to Sell any Shares or Related Securities currently or hereafter owned either of record or  
 beneficially (as defined in Rule 13d-3 under the Exchange Act) by the undersigned or such Family Member, |

| • |     | enter into any Swap, |

| • |     | make any demand for, or exercise any right with respect to, the registration under the Securities Act of the                                                                                                             
 offer and sale of any Shares or Related Securities, or cause to be filed a registration statement, prospectus or prospectus supplement (or an amendment or supplement thereto) with respect to any such registration, or |

| • |     | publicly announce any intention to do any of the foregoing. |

The foregoing will not apply to (i) the offer and sale of Shares and Related Securities pursuant to the Private Placement or (ii) the inclusion of any Shares (including Shares subject to Related Securities) purchased in the Private Placement in the registration statement that is contemplated to be filed with the SEC by the Company to register the resale of the Shares (including Shares subject to Related Securities) purchased in the Private Placement (the “ Resale Registration Statement”), provided that any such Shares may not be sold pursuant to the Resale Registration Statement during the Lock-upPeriod. In addition, the foregoing restrictions will not apply to the transfer of Shares or Related Securities:

| i. | as a bona fide gift or gifts, |

| ii. | by will or intestacy, |

D-53

| iii. | to any trust or other entities formed for the direct or indirect benefit of the undersigned or a Family Member 
 of the undersigned,                                                                                            |

| iv. | to any Family Member, |

| v. | if the undersigned is a trust, to a trustor, trustee or beneficiary of the trust or to the estate of a 
 beneficiary of such trust,                                                                             |

| vi. | to a corporation, partnership, limited liability company or other entity of which the undersigned or any Family 
 Member is the legal and beneficial owner of all of the outstanding equity securities or similar