Company: WHWK
Filing Date: 2025-01-31
Form Type: DEFM14A
Source: 0001193125-25-018470
Chunk: 760

Company: Whitehawk Therapeutics, Inc.
Filing Date: 2025-01-31
Form: DEFM14A
Chunk 760
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 payment of tax withholdings or remittance payments due as a result of the vesting or settlement of such restricted               
 stock units, in all such cases, pursuant to equity awards granted under a stock incentive plan or other equity award plan, which plan is described in the Company’s filings with the SEC, provided that any Shares or Related Securities received as     
 a result of such exercise, vesting or settlement shall remain subject to the terms of this letter agreement, and                                                                                                                                         |

| xii. | pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction that is                                                                                                                                     
 approved by the Board of Directors of the Company and made to all holders of the Company’s capital stock involving a Change of Control of the Company, provided that in the event that such tender offer, merger, consolidation or other similar 
 transaction is not completed, the undersigned’s Shares and Related Securities shall remain subject to the provisions of this letter agreement,                                                                                                   |

provided, however, that in any such case, it shall be a condition to such transfer that:

| • |     | in the case of any transfer pursuant to clauses (i) through (vii) and (ix) above, each transferee   
 executes and delivers to the Placement Agent a lock-up letter in the form of this letter agreement, |

D-54

| • |     | in the case of any transfer pursuant to clauses (i) through (viii) above, no public disclosure or filing                                                    
 shall be required, or made voluntarily, during the Lock-up Period reporting a reduction in beneficial ownership of Shares in connection with such transfer, |

| • |     | in the case of any transfer pursuant to clauses (ix), (x) and (xi) above, no public disclosure or filing                                                                                                     
 reporting a change in beneficial ownership of Shares or Related Securities shall be made voluntarily during the Lock-up Period, and if the undersigned is required to file a report under Section 16 of the  
 Exchange Act reporting a change in beneficial ownership of Shares or Related Securities during the Lock-up Period, the undersigned shall include a statement in such report to the effect that such transfer 
 relates to the circumstances described in clause (ix), (x) or (xi), as applicable, and                                                                                                                       |

| • |     | in the case of any transfer pursuant to clauses (i) through (vii) above, such transfer shall not involve a 
 disposition for value.                                                                                     |

Furthermore, notwithstanding the restrictions imposed by this letter agreement,