Jay M. Short PhD - 11 Mar 2026 Form 4 Insider Report for BioAtla, Inc. (BCAB)

Role: Chief Executive Officer, Director
Signature: Christian Vasquez, as Attorney-in-Fact for Jay M. Short
Issuer symbol: BCAB
Transactions as of: 11 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 12 Mar 2026, 16:07:56 UTC
Previous filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SHORT JAY M PHD	Chief Executive Officer, Director	C/O BIOATLA, INC. 11085 TORREYANA ROAD, SAN DIEGO	Christian Vasquez, as Attorney-in-Fact for Jay M. Short	12 Mar 2026	0001205375

Transactions Table

Type	Sym	Class	Transaction	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BCAB	Common Stock	Award	+430,000	+19%	$0.000000^*	2,659,603	11 Mar 2026	Direct	F1
holding	BCAB	Common Stock					793,547	11 Mar 2026	By Spouse
holding	BCAB	Common Stock					258,727	11 Mar 2026	By Carolyn Short 2020 Irrevocable Gift Trust
holding	BCAB	Common Stock					258,727	11 Mar 2026	By Jay Short 2020 Irrevocable Gift Trust
holding	BCAB	Common Stock					302,324	11 Mar 2026	By Capia IP, LLC
holding	BCAB	Common Stock					50	11 Mar 2026	By Himalaya Parent LLC	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares of Common Stock underlying a time-based restricted stock unit award ("RSU"). The RSU will vest as to 25% of the total number of shares on March 11, 2027, and thereafter, 6.25% of the total number of shares subject to the RSU shall vest on the last day of each May, August, November and February, subject to the reporting person's continued service through the applicable vesting date.
F2	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.

Content

Represents shares of Common Stock underlying a time-based restricted stock unit award ("RSU"). The RSU will vest as to 25% of the total number of shares on March 11, 2027, and thereafter, 6.25% of the total number of shares subject to the RSU shall vest on the last day of each May, August, November and February, subject to the reporting person's continued service through the applicable vesting date.

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.