Eric Sievers - 10 Mar 2026 Form 4 Insider Report for BioAtla, Inc. (BCAB)

Role: Chief Medical Officer
Signature: Christian Vasquez, as Attorney-in-Fact for Eric Sievers
Issuer symbol: BCAB
Transactions as of: 10 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 12 Mar 2026, 16:08:15 UTC
Previous filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sievers Eric	Chief Medical Officer	C/O BIOATLA, INC. 11085 TORREYANA ROAD, SAN DIEGO	Christian Vasquez, as Attorney-in-Fact for Eric Sievers	12 Mar 2026	0001835116

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BCAB	Common Stock	Award		+240,000	+67%	$0.000000^*	598,705	10 Mar 2026	Direct	F1

* 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 10, 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.

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 10, 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.