BioAtla CFO has 71 shares withheld for taxes

BioAtla CFO Christian Vasquez had shares withheld to cover taxes on RSU vesting, leaving him with 10,476 directly held BCAB shares.

Rhea-AI Filing Summary

BioAtla, Inc. (BCAB) reported that Chief Financial Officer Christian Vasquez had 71 shares of common stock withheld on August 31, 2026 to pay income tax obligations related to the vesting and net settlement of previously reported restricted stock units. This was not an open-market sale; the shares were withheld by the company for tax and remittance purposes. Following this tax-withholding transaction, Vasquez directly holds 10,476 shares of BioAtla common stock, including shares purchased under the company’s ESPP.

Insider Trade Summary

Tax Withholding: 71 shares

Tax Withholding 1 txn

Insider Vasquez Christian

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	71	$1.69	$119.99

Holdings After Transaction: Common Stock — 10,476 shares (Direct)

Footnotes (2)

1. F1. 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. F2. Includes shares purchased under the Issuer's ESPP.

Key Figures

Shares withheld for tax: 71 shares Per-share value for withholding: $1.69 per share Shares held after transaction: 10,476 shares

3 metrics

Shares withheld for tax 71 shares Shares of BioAtla common stock withheld on August 31, 2026 to satisfy tax obligations on RSU vesting

Per-share value for withholding $1.69 per share Value applied to the 71 shares withheld for tax on August 31, 2026

Shares held after transaction 10,476 shares Directly held BioAtla common shares by CFO Christian Vasquez following the August 31, 2026 transaction, including ESPP shares

Key Terms

restricted stock units, net settlement, ESPP, withheld by the Issuer

4 terms

restricted stock units financial

"in connection with the vesting and net settlement of previously reported restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

net settlement financial

"in connection with the vesting and net settlement of previously reported restricted stock units"

ESPP financial

"Includes shares purchased under the Issuer's ESPP."

An Employee Stock Purchase Plan (ESPP) is a company program that lets employees buy the company’s shares at a reduced price, usually by setting aside a small portion of their pay over time. It matters to investors because it encourages employees to own part of the business—like giving staff a discounted membership— which can boost commitment and performance, while also potentially increasing the number of shares available and affecting shareholder value.

withheld by the Issuer financial

"represents shares that have been withheld by the Issuer to satisfy its income tax"

FAQ

What insider transaction did BioAtla (BCAB) disclose for CFO Christian Vasquez?

CFO Christian Vasquez reported a transaction on August 31, 2026 where 71 shares of BioAtla common stock were withheld by the company to satisfy income tax and withholding obligations from vesting restricted stock units.

Was the August 31, 2026 BioAtla (BCAB) transaction an open-market sale by the CFO?

No. The filing states the transaction is not a sale of shares by the CFO. The 71 shares were withheld by BioAtla to satisfy income tax, withholding, and remittance obligations tied to RSU vesting and net settlement.

At what price were the 71 BioAtla (BCAB) shares valued for the tax withholding?

The 71 shares of BioAtla common stock used for tax withholding were valued at approximately $1.69 per share in the transaction reported for August 31, 2026.

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

After the August 31, 2026 tax-withholding transaction, CFO Christian Vasquez directly holds 10,476 shares of BioAtla common stock, which the filing notes include shares purchased under the company’s ESPP.

Was a Rule 10b5-1 trading plan involved in the BioAtla (BCAB) Form 4 transaction?

No. The filing does not indicate that the August 31, 2026 tax-withholding transaction was made under a Rule 10b5-1 trading plan; the document-level checkbox for such a plan is not marked as applicable.

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Available on EDGAR 09/02/2026 - 05:27 PM Accepted by SEC EDGAR 09/02/2026 - 05:26 PM Learn about SEC filing dates

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 CALIFORNIA 92121

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	08/31/2026		F(1)		71	D	$1.69	10,476(2)	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.

2. Includes shares purchased under the Issuer's ESPP.

	Christian Vasquez	09/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)