Whitehawk CEO sells shares to cover tax withholding

Whitehawk Therapeutics director and CEO David James Lennon sold shares to cover taxes tied to equity vesting.

Accepted by SEC EDGAR 04/08/2026 - 08:32 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Whitehawk Therapeutics director and CEO David James Lennon sold shares to cover taxes tied to equity vesting. Over April 6–8, 2026, he executed broker-assisted sales totaling 260,427 shares of Common Stock at prices around $3.40–$3.51 per share.

According to a footnote, these transactions were made solely to satisfy his tax withholding obligations in connection with the vesting of restricted stock units, rather than discretionary open-market sales. After these dispositions, he directly holds 533,122 Common Stock shares.

Insider Trade Summary

Net Seller: 260,427 shares

Net Sell 3 txns

Insider Lennon David James

Role CHIEF EXECUTIVE OFFICER

Sold 260,427 shs ($900K)

Type	Security	Shares	Price	Value
Sale	Common Stock	63,945	$3.40	$217K
Sale	Common Stock	94,087	$3.43	$323K
Sale	Common Stock	102,395	$3.51	$359K

Holdings After Transaction: Common Stock — 533,122 shares (Direct)

Footnotes (1)

1. F1. Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units.

Key Figures

Shares disposed April 6, 2026: 102,395 shares at $3.51/share Shares disposed April 7, 2026: 94,087 shares at $3.43/share Shares disposed April 8, 2026: 63,945 shares at $3.40/share +2 more

5 metrics

Shares disposed April 6, 2026 102,395 shares at $3.51/share Common Stock, broker-assisted sale for tax withholding

Shares disposed April 7, 2026 94,087 shares at $3.43/share Common Stock, broker-assisted sale for tax withholding

Shares disposed April 8, 2026 63,945 shares at $3.40/share Common Stock, broker-assisted sale for tax withholding

Total shares disposed 260,427 shares Net reported Common Stock dispositions tied to tax withholding

Shares held after transactions 533,122 shares Direct Common Stock ownership after April 8, 2026

Key Terms

broker-assisted sale, tax withholding obligations, restricted stock units, Common Stock, +1 more

5 terms

broker-assisted sale financial

"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations"

tax withholding obligations financial

"sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting"

restricted stock units financial

"tax withholding obligations in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Whitehawk Therapeutics (WHWK) CEO David James Lennon report in this Form 4?

David James Lennon reported broker-assisted sales of Whitehawk Therapeutics common stock to cover tax withholding obligations. These dispositions relate to the vesting of restricted stock units, indicating a compensation-driven event rather than a discretionary open-market trading decision.

How many Whitehawk Therapeutics (WHWK) shares did the CEO dispose of?

Across three transactions on April 6–8, 2026, the CEO disposed of a total of 260,427 shares of Whitehawk Therapeutics common stock. Each transaction is reported as a sale but is described in the footnote as satisfying tax withholding obligations.

At what prices were Whitehawk Therapeutics (WHWK) shares sold by the CEO?

The reported transactions show sale prices of $3.51, $3.43, and $3.40 per share on April 6, 7, and 8, 2026, respectively. These prices apply to the broker-assisted sales executed to cover tax withholding on restricted stock unit vesting.

How many Whitehawk Therapeutics (WHWK) shares does the CEO hold after these transactions?

Following the reported tax-related share dispositions, David James Lennon directly holds 533,122 shares of Whitehawk Therapeutics common stock. This post-transaction balance reflects his remaining direct ownership after the broker-assisted sales for tax withholding.

Were the Whitehawk Therapeutics (WHWK) CEO’s Form 4 transactions open-market sales?

Although coded as sales, a footnote explains they were broker-assisted transactions to satisfy tax withholding obligations on restricted stock unit vesting. This indicates the events are tax-related dispositions, not discretionary open-market selling for portfolio reasons.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Lennon David James

(Last) (First) (Middle)

C/O WHITEHAWK THERAPEUTICS, INC.

2 HEADQUARTERS PLAZA, EAST BUILDING, 11T

(Street)

MORRISTOWN NEW JERSEY 07960

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Whitehawk Therapeutics, Inc. [ WHWK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF EXECUTIVE OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/06/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	04/06/2026		S(1)		102,395	D	$3.51	691,154	D
Common Stock	04/07/2026		S(1)		94,087	D	$3.43	597,067	D
Common Stock	04/08/2026		S(1)		63,945	D	$3.4	533,122	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

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

	/s/ Stephen Rodin, as Attorney-in-Fact	04/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)