David James Lennon - 01 Apr 2026 Form 4 Insider Report for Whitehawk Therapeutics, Inc. (WHWK)

Reporting relationship: CHIEF EXECUTIVE OFFICER, Director
Issuer ticker: WHWK
Reported as of: 01 Apr 2026
Net transaction value: -$93,466
SEC form: 4
Accepted by SEC: 03 Apr 2026, 18:17:15 UTC
Prior SEC filing: 10 Mar 2026
Next SEC filing: 08 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen Rodin, as Attorney-in-Fact

Key filing fact

David James Lennon filed Form 4 for Whitehawk Therapeutics, Inc. (WHWK) on 03 Apr 2026.

Key facts

This page summarizes David James Lennon's Form 4 filing for Whitehawk Therapeutics, Inc. (WHWK).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 03 Apr 2026, 18:17.

Change

Previous filing in this sequence was filed on 10 Mar 2026.
Current net transaction value: -$93,466.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001995275 Primary reporting owner

Lennon David James

Relationship: CHIEF EXECUTIVE OFFICER, Director
Address: C/O WHITEHAWK THERAPEUTICS, INC., 2 HEADQUARTERS PLAZA, EAST BUILDING, 11T, MORRISTOWN
Signature: /s/ Stephen Rodin, as Attorney-in-Fact
Signature date: 03 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

WHWK transaction

Common Stock

Options Exercise

Transaction value
Shares: +775,828
Change %: +1740%
Price
Shares after: 820,407
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F1

WHWK transaction

Common Stock

Sale

Transaction value: $93,466
Shares: -26,858
Change %: -3.3%
Price: $3.48
Shares after: 793,549
Date: 02 Apr 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

WHWK transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -775,828
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 775,828
Exercise price
Footnotes: F1, F3

WHWK transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +831,148
Change %
Price: $0.000000^*
Shares after: 831,148
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 831,148
Exercise price: $3.54
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Whitehawk Therapeutics, Inc. Common Stock.

Footnote F2

Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units.

Footnote F3

Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2021 Equity Incentive Plan) through each applicable date, one hundred percent (100%) of the shares subject to the award shall vest on the one-year anniversary of the Vesting Commencement Date. "Vesting Commencement Date" shall mean April 1, 2025.

Footnote F4

Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2021 Equity Incentive Plan) through each applicable date, twenty five percent (25%) of the shares subject to the option shall vest on the one-year anniversary of the Vesting Commencement Date and 1/48th of the total shares subject to the Option shall vest every month thereafter such that all shares subject to the option shall be fully vested on the four-year anniversary of the Vesting Commencement Date. "Vesting Commencement Date" shall mean April 1, 2026.