BioAtla (BCAB) CFO sees 1,802 shares withheld for RSU tax settlement

Rhea-AI Filing Summary

BioAtla, Inc. Chief Financial Officer Christian Vasquez reported a tax-related share disposition, not an open-market sale. On the reported date, 1,802 shares of common stock at a value of $0.247 per share were withheld by the company to cover income tax obligations tied to vesting restricted stock units. After this withholding event, Vasquez directly owned 290,196 shares of BioAtla common stock. This type of Form 4 transaction reflects routine equity compensation tax settlement rather than discretionary trading in the open market.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Vasquez Christian

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,802	$0.247	$445.09

Holdings After Transaction: Common Stock — 290,196 shares (Direct)

Footnotes (1)

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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^*

Vasquez Christian

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial 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)		1,802	D	$0.247	290,196	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. 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.

	Christian Vasquez	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 insider transaction did BioAtla (BCAB) report for Christian Vasquez?

BioAtla reported a Form 4 for CFO Christian Vasquez showing 1,802 common shares withheld. These shares were retained by the company to cover tax obligations from vesting restricted stock units, rather than being sold in the open market.

Was the BioAtla (BCAB) CFO’s Form 4 transaction an open-market share sale?

No, the transaction was not an open-market sale. The filing states the 1,802 shares were withheld by BioAtla to satisfy income tax and withholding obligations related to previously reported restricted stock units vesting.

How many BioAtla (BCAB) shares were involved in the CFO’s tax-withholding transaction?

The Form 4 shows 1,802 shares of BioAtla common stock were withheld. The value used for the withholding event was $0.247 per share, according to the reported transaction price in the filing.

How many BioAtla (BCAB) shares does CFO Christian Vasquez hold after this Form 4 event?

After the tax-withholding disposition, Christian Vasquez directly owned 290,196 shares of BioAtla common stock. This figure reflects his holdings following the company’s withholding of 1,802 shares to cover tax obligations on vesting restricted stock units.

What does transaction code "F" mean in the BioAtla (BCAB) Form 4 filing?

Transaction code “F” indicates payment of an exercise price or tax liability by delivering securities. In this case, it reflects BioAtla withholding 1,802 shares from CFO Christian Vasquez to satisfy income tax obligations on vested restricted stock units.