[Form 4] BioAtla, Inc. Insider Trading Activity

Rhea-AI Filing Summary

BioAtla director Eddie Williams received a significant equity grant on June 18, 2025, consisting of 23,500 restricted stock units (RSUs). The RSUs were granted at $0 cost and will fully vest on the earlier of June 18, 2026, or the next annual stockholder meeting, contingent on Williams' continued service.

Following this transaction, Williams' direct beneficial ownership increased to 60,200 shares. The grant represents a standard director compensation arrangement and was reported in compliance with SEC Section 16(a) requirements.

Key details of the RSU grant:

• Time-based vesting structure with one-year cliff
• No exercise price as these are RSUs, not options
• Direct ownership form
• Filed via power of attorney through Christian Vasquez

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^*

Williams Eddie

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
06/18/2025

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	06/18/2025		A		23,500(1)	A	$0	60,200	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 shares of Common Stock underlying a time-based restricted stock unit award ("RSU"). The RSU will vest as to 100% of the total number of shares on the earlier of (i) June 18, 2026, or (ii) the next Company annual meeting of stockholders, subject to the reporting person's continued service through the vesting date.

	/s/ Christian Vasquez, as Attorney-in-Fact for Eddie Williams	06/18/2025
	** 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

How many shares of BioAtla (BCAB) stock did Director Eddie Williams acquire on June 18, 2025?

Director Eddie Williams acquired 23,500 shares of BioAtla (BCAB) common stock on June 18, 2025 in the form of restricted stock units (RSUs).

What is the vesting schedule for BCAB Director Eddie Williams' RSU grant?

The RSUs will vest 100% on the earlier of either (i) June 18, 2026, or (ii) BioAtla's next annual meeting of stockholders, subject to Williams' continued service through the vesting date.

How many BCAB shares does Eddie Williams own after the June 18, 2025 transaction?

Following the reported RSU grant transaction, Eddie Williams beneficially owns 60,200 shares of BioAtla (BCAB) stock directly.

What was the purchase price of BCAB shares in Eddie Williams' June 2025 acquisition?

The RSUs were granted at $0 cost to Eddie Williams as part of his compensation as a director of BioAtla (BCAB).

Who filed this Form 4 for BCAB Director Eddie Williams?

The Form 4 was filed by Christian Vasquez as Attorney-in-Fact for Eddie Williams on June 18, 2025.