Company: WHWK
Filing Date: 2025-01-21
Form Type: PREM14A
Source: 0001193125-25-009599
Chunk: 786

Company: Whitehawk Therapeutics, Inc.
Filing Date: 2025-01-21
Form: PREM14A
Chunk 786
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| COMPANY: |     |                         |
| By:      |     |                         |
|          |     | David J. Lennon         |
|          |     | Chief Executive Officer |

[Signature Page to Registration Rights Agreement] E-13

IN WITNESS WHEREOF, the parties have executed this Agreement or caused their duly authorized persons to execute this Agreement as of the day and year first written above.

| PURCHASER: |
| By:        |
| Name:      |
| Title:     |

[Signature Page to Registration Rights Agreement] E-14

Annex A PLAN OF DISTRIBUTION The selling stockholders, which as used herein includes donees, pledgees, transferees or other successors-in-interestselling shares of common stock or interests in shares of common stock received after the date of this prospectus from a selling stockholder as a gift, pledge, partnership distribution or other transfer, may, from time to time, sell, transfer or otherwise dispose of any or all of their shares of common stock or interests in shares of common stock on any stock exchange, market or trading facility on which the shares are traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices. The selling stockholders may use any one or more of the following methods when disposing of shares or interests therein:

| • |     | ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers; |

| • |     | block trades in which the broker-dealer will attempt to sell the shares as agent, but may position and resell a 
 portion of the block as principal to facilitate the transaction;                                                |

| • |     | purchases by a broker-dealer as principal and resale by the broker-dealer for its account; |

| • |     | an exchange distribution in accordance with the rules of the applicable exchange; |

| • |     | privately negotiated transactions; |

| • |     | short sales effected after the date the registration statement of which this prospectus is a part is declared 
 effective by the SEC;                                                                                         |

| • |     | through the writing or settlement of options or other hedging transactions, whether through an options exchange 
 or otherwise;                                                                                                   |

| • |     | broker-dealers may agree with the selling stockholders to sell a specified number of such shares at a stipulated 
 price per share;