Whitehawk insider sells shares for tax withholding

Whitehawk Therapeutics insider Bryan Ball reported dispositions of company common stock that were executed solely to cover taxes on equity compensation.

Rhea-AI Filing Summary

Whitehawk Therapeutics insider Bryan Ball reported dispositions of company common stock that were executed solely to cover taxes on equity compensation. On April 9 and 10, he completed broker-assisted sales totaling 56,596 shares at prices between $3.43 and $3.57 per share.

The footnote explains these trades were conducted to satisfy tax withholding obligations arising from the vesting of restricted stock units, rather than discretionary open-market sales. After these transactions, Ball still directly holds 515,955 shares of Whitehawk Therapeutics common stock.

Insider Trade Summary

Net Seller: 56,596 shares

Net Sell 2 txns

Insider BALL BRYAN

Role See remarks

Sold 56,596 shs ($201K)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,596	$3.43	$23K
Sale	Common Stock	50,000	$3.57	$179K

Holdings After Transaction: Common Stock — 515,955 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 sold 2026-04-09: 50,000 shares at $3.57 Shares sold 2026-04-10: 6,596 shares at $3.43 Total shares disposed: 56,596 shares +2 more

5 metrics

Shares sold 2026-04-09 50,000 shares at $3.57 Open-market broker-assisted sale to cover tax withholding

Shares sold 2026-04-10 6,596 shares at $3.43 Open-market broker-assisted sale to cover tax withholding

Total shares disposed 56,596 shares Shares sold to satisfy tax withholding on RSU vesting

Shares held after transactions 515,955 shares Direct ownership following reported dispositions

Transaction dates April 9–10, 2026 Dates of broker-assisted sales for tax withholding

Key Terms

broker-assisted sale, tax withholding obligations, restricted stock units, open-market sale

4 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.

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 Bryan Ball do in this Form 4 for Whitehawk Therapeutics (WHWK)?

Bryan Ball reported broker-assisted sales of Whitehawk Therapeutics common stock. The transactions disposed of shares to cover tax withholding from restricted stock unit vesting, rather than discretionary portfolio sales, while leaving him with a substantial remaining direct ownership position.

How many Whitehawk Therapeutics (WHWK) shares were sold in this tax-related transaction?

The Form 4 reports total dispositions of 56,596 shares of Whitehawk Therapeutics common stock. These were executed over two days as broker-assisted sales specifically to satisfy tax withholding obligations tied to the vesting of restricted stock units granted to Bryan Ball.

At what prices were Bryan Ball’s Whitehawk Therapeutics (WHWK) shares sold?

The reported transactions show shares sold at $3.57 per share on one day and $3.43 per share on the next. These prices applied to broker-assisted sales executed solely to cover tax withholding obligations from restricted stock unit vesting.

Does Bryan Ball still hold Whitehawk Therapeutics (WHWK) shares after this Form 4?

Yes. Following the reported tax-withholding-related sales, Bryan Ball directly holds 515,955 shares of Whitehawk Therapeutics common stock. This post-transaction balance indicates he maintained a significant equity stake after satisfying his tax obligations from restricted stock unit vesting.

Were the Whitehawk Therapeutics (WHWK) share sales discretionary or tax-related?

According to the footnote, the sales were tax-related. They were broker-assisted transactions executed to satisfy Bryan Ball’s tax withholding obligations arising from the vesting of restricted stock units, rather than discretionary open-market sales based on independent investment decisions.

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

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Accepted by SEC EDGAR 04/13/2026 - 08:34 PM EDT Learn about SEC filing dates

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^*

BALL BRYAN

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See remarks

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/09/2026

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	04/09/2026		S(1)		50,000	D	$3.57	522,551	D
Common Stock	04/10/2026		S(1)		6,596	D	$3.43	515,955	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.

Remarks:

Chief Technical Operations Officer and SVP, Manufacturing Operations

	/s/ Stephen Rodin, as Attorney-in-Fact	04/13/2026
	** 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)