BioAtla (BCAB) CEO has shares withheld to cover RSU taxes

Rhea-AI Filing Summary

BioAtla, Inc. reported that Chief Executive Officer Jay M. Short, Ph.D., had 7,728 shares of common stock withheld on February 28, 2026 at $0.247 per share. According to the filing, this was a tax-withholding disposition related to the vesting and net settlement of previously reported restricted stock units, and not an open-market sale.

After this withholding, Dr. Short directly holds 2,229,603 common shares. He also has indirect ownership positions through his spouse and various entities, including the Carolyn Short 2020 Irrevocable Gift Trust, the Jay Short 2020 Irrevocable Gift Trust, Capia IP, LLC, and Himalaya Parent LLC, where he and his spouse serve as managers and disclaim beneficial ownership beyond any pecuniary interest.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider SHORT JAY M PHD

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	7,728	$0.247	$2K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 2,229,603 shares (Direct); Common Stock — 793,547 shares (Indirect, By Spouse)

Footnotes (1)

1. This transaction is not a sale of shares by the Reporting Person. Instead, this represents shares that have been withheld by the Issuer to satisfy its income tax and withholding and remittance obligations in connection with the vesting and net settlement of previously reported restricted stock units. The Reporting Person and his spouse are the managers of Himalaya Parent LLC and collectively make investment decisions on the behalf of the entity. The Reporting Person and his spouse disclaim beneficial ownership of the reported securities except to the extent of his or her pecuniary interest therein.

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Form 4 Insider Transactions: What Each Field Means →

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^*

SHORT JAY M PHD

(Last) (First) (Middle)

C/O BIOATLA, INC. 11085 TORREYANA ROAD

(Street)

SAN DIEGO CA 92121

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
BioAtla, Inc. [ BCAB ]

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

3. Date of Earliest Transaction (Month/Day/Year)
02/28/2026

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

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

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

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	02/28/2026		F(1)		7,728	D	$0.247	2,229,603	D
Common Stock								793,547	I	By Spouse
Common Stock								258,727	I	By Carolyn Short 2020 Irrevocable Gift Trust
Common Stock								258,727	I	By Jay Short 2020 Irrevocable Gift Trust
Common Stock								302,324	I	By Capia IP, LLC
Common Stock								50	I	By Himalaya Parent LLC(2)

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. This transaction is not a sale of shares by the Reporting Person. Instead, this represents shares that have been withheld by the Issuer to satisfy its income tax and withholding and remittance obligations in connection with the vesting and net settlement of previously reported restricted stock units.

2. The Reporting Person and his spouse are the managers of Himalaya Parent LLC and collectively make investment decisions on the behalf of the entity. The Reporting Person and his spouse disclaim beneficial ownership of the reported securities except to the extent of his or her pecuniary interest therein.

	Christian Vasquez, as Attorney-in-Fact for Jay M. Short	03/02/2026
	** 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.

FAQ

What did BioAtla (BCAB) CEO Jay Short report in this Form 4?

BioAtla CEO Jay M. Short, Ph.D., reported a tax-withholding share disposition. The issuer withheld 7,728 common shares at $0.247 each to satisfy income tax obligations from vesting restricted stock units, leaving him with 2,229,603 shares held directly.

Was the BioAtla CEO’s Form 4 transaction an open-market stock sale?

No, the transaction was not an open-market sale. The shares were withheld by BioAtla to cover income tax and withholding obligations upon vesting of restricted stock units, as disclosed in the footnote, rather than sold by the CEO into the market.

How many BioAtla shares does CEO Jay Short hold directly after this filing?

After the tax-withholding transaction, Jay M. Short, Ph.D., directly holds 2,229,603 shares of BioAtla common stock. This figure reflects his direct ownership following the issuer’s withholding of 7,728 shares to satisfy tax obligations tied to restricted stock unit vesting.

What price per share was used for the BioAtla CEO’s tax-withholding disposition?

The tax-withholding disposition used a price of $0.247 per share. BioAtla withheld 7,728 common shares at this price to cover income tax and withholding obligations associated with the vesting and net settlement of previously reported restricted stock units.

What indirect BioAtla shareholdings are associated with CEO Jay Short?

Indirect holdings are reported through his spouse, two 2020 Irrevocable Gift Trusts, Capia IP, LLC, and Himalaya Parent LLC. He and his spouse manage Himalaya Parent LLC and disclaim beneficial ownership of those securities except to the extent of any pecuniary interest.

When did the BioAtla CEO’s RSU-related tax-withholding transaction occur?

The RSU-related tax-withholding transaction occurred on February 28, 2026. On that date, BioAtla withheld 7,728 common shares from CEO Jay M. Short, Ph.D., to satisfy income tax and withholding obligations triggered by the vesting of restricted stock units.