BCAB Insider Filing: Jay M. Short RSU Tax Withholding of 6,347 Shares

Rhea-AI Filing Summary

Jay M. Short, Chief Executive Officer, Director and reported 10% owner of BioAtla, Inc. (BCAB), filed a Form 4 disclosing a non-sale transaction on 08/31/2025. The filing shows 6,347 shares of Common Stock were withheld by the issuer at a price of $0.4555 to satisfy income tax and withholding obligations related to the vesting and net settlement of previously reported restricted stock units. After the withholding, the reporting person directly beneficially owned 2,243,678 shares. The Form 4 also reports indirect holdings: 793,547 shares held by spouse, two trusts with 258,727 shares each, 302,324 shares by Capia IP, LLC, and 50 shares by Himalaya Parent LLC, where the reporting person and spouse are managers. The filing was signed by an attorney-in-fact on 09/02/2025.

Positive

• Transaction is non-sale and tax-related, indicating restricted stock units were settled rather than an open-market disposal
• Comprehensive ownership disclosure listing direct and multiple indirect holdings (spouse, trusts, LLCs) with disclaimers

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine tax withholding from vested RSUs; ownership structure and disclosure are clear and compliant.

The Form 4 documents a withholding of 6,347 Common Stock shares to satisfy tax obligations tied to RSU vesting, not an open-market sale. Such withholdings are common and indicate equity compensation is being settled. The filing clearly lists both direct and multiple categories of indirect ownership, including spouse holdings and trust/LLC interests, and includes the reporting persons roles as CEO, Director, and 10% owner. The signature by an attorney-in-fact is properly noted. From a governance perspective, this is a routine insider reporting event and meets Section 16 disclosure requirements.

Securities/Insider Transactions Analyst

TL;DR: Small withholding reduces direct shares marginally; transaction is non-sale and tax-related.

The reported transaction code and explanation specify that shares were withheld by the issuer for tax withholding upon RSU vesting, confirming this was not a market disposition. The number withheld (6,347) at $0.4555 is small relative to the reported direct beneficial ownership of 2,243,678 shares. The report also maps indirect holdings through spouse, trusts, and affiliated entities, with clear disclaimers about beneficial ownership limits. This filing provides transparent detail relevant for tracking insider equity changes.

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
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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	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/31/2025

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	08/31/2025		F(1)		6,347	D	$0.4555	2,243,678	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.

	/s/ Christian Vasquez, as Attorney-in-Fact for Jay M. Short	09/02/2025
	** 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 transaction did Jay M. Short report on Form 4 for BCAB?

The Form 4 reports that 6,347 shares of Common Stock were withheld by the issuer on 08/31/2025 to satisfy tax and withholding obligations related to vested restricted stock units.

Was the reported transaction a sale of BioAtla (BCAB) shares?

No. The filing explicitly states this was not a sale; shares were withheld by the issuer to cover tax obligations from RSU vesting.

How many shares does Jay M. Short beneficially own after the transaction?

The Form 4 shows 2,243,678 shares beneficially owned directly by the reporting person following the transaction.

What indirect holdings are reported for Jay M. Short on this Form 4?

Indirect holdings include 793,547 shares by spouse, 258,727 shares by the Carolyn Short 2020 Irrevocable Gift Trust, 258,727 shares by the Jay Short 2020 Irrevocable Gift Trust, 302,324 shares by Capia IP, LLC, and 50 shares by Himalaya Parent LLC.

When was the Form 4 signed and by whom?

The form was signed on 09/02/2025 by Christian Vasquez, acting as attorney-in-fact for Jay M. Short.