BioAtla CFO reports routine tax-withholding share entries

BioAtla, Inc. Chief Financial Officer Christian Vasquez reported routine tax-withholding transactions related to equity compensation, not open‑market trades.

Rhea-AI Filing Summary

BioAtla, Inc. Chief Financial Officer Christian Vasquez reported routine tax-withholding transactions related to equity compensation, not open‑market trades. On two dates in 2026, a total of 257 shares of common stock were withheld by the company to cover income tax obligations from vesting restricted stock units.

After the most recent withholding of 82 shares at $3.93 per share, Vasquez directly owned 10,347 shares of common stock. The reported share amounts have been adjusted to reflect a 50‑for‑1 share consolidation effective on April 6, 2026.

Insider Trade Summary

Exercise Price or Tax Liability: 257 shares

Exercise Price or Tax Liability 2 txns

Insider Vasquez Christian

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	82	$3.93	$322.26
Exercise Price or Tax Liability	Common Stock	175	$0.169	$29.58

Holdings After Transaction: Common Stock — 10,347 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. Effective on April 6, 2026, the Issuer effected a 50-for-1 share consolidation of its common stock (the "Share Consolidation"). The amount of securities reported on this Form 4 has been adjusted to reflect the Share Consolidation.

Key Figures

Tax-withholding shares (May 31, 2026): 82 shares at $3.93/share Tax-withholding shares (March 11, 2026): 175 shares at $0.169/share Total shares withheld for taxes: 257 shares +2 more

5 metrics

Tax-withholding shares (May 31, 2026) 82 shares at $3.93/share Common stock withheld to satisfy tax obligations

Tax-withholding shares (March 11, 2026) 175 shares at $0.169/share Common stock withheld to satisfy tax obligations

Total shares withheld for taxes 257 shares Aggregate 2026 tax-withholding dispositions reported

Shares held after latest transaction 10,347 shares Direct common stock ownership following May 31, 2026 withholding

Share consolidation ratio 50-for-1 Common stock share consolidation effective April 6, 2026

Key Terms

restricted stock units, share consolidation, withheld by the Issuer, net settlement

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.

share consolidation financial

"the Issuer effected a 50-for-1 share consolidation of its common stock"

Share consolidation is a process where a company reduces the total number of its shares by combining multiple existing shares into a smaller number of higher-value shares. This can make each share more expensive and potentially improve the company’s image. For investors, it often means their ownership remains the same, but the value of each share increases, which can influence how the stock is perceived and traded.

withheld by the Issuer financial

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

net settlement financial

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

Christian Vasquez reported two routine Form 4 transactions where shares were withheld to cover taxes on vesting restricted stock units, not open-market trades. In total, 257 common shares were withheld by BioAtla in 2026 to satisfy income tax and remittance obligations.

Were the BioAtla (BCAB) CFO’s reported transactions sales of stock?

No, the filing states these were not sales by the reporting person. The shares were withheld by BioAtla to satisfy income tax and withholding obligations tied to vesting restricted stock units, a common non-cash method for handling equity compensation-related taxes.

How many BioAtla (BCAB) shares were withheld for the CFO’s tax obligations?

The Form 4 shows 82 shares withheld at $3.93 per share on one date and 175 shares at $0.169 per share on another, totaling 257 shares. These withholdings covered income tax and remittance obligations for vesting restricted stock units.

How many BioAtla (BCAB) shares does CFO Christian Vasquez hold after these transactions?

Following the latest tax-withholding disposition, Christian Vasquez directly holds 10,347 shares of BioAtla common stock. This post-transaction balance reflects the impact of the withheld shares and has been adjusted in the filing for the 50-for-1 share consolidation.

What is the 50-for-1 share consolidation mentioned in the BioAtla (BCAB) Form 4?

The filing explains BioAtla effected a 50-for-1 share consolidation of its common stock effective April 6, 2026. All share amounts reported in the Form 4, including the CFO’s holdings and withheld shares, have been adjusted to reflect this consolidated share structure.

Why were BioAtla (BCAB) shares withheld instead of the CFO paying cash taxes?

The Form 4 describes the transactions as payment of tax liability by delivering securities. Rather than paying cash, a portion of the vested restricted stock units was withheld by BioAtla to meet income tax and withholding obligations, a standard equity compensation practice.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/05/2026 - 04:30 PM EDT 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)
03/11/2026

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	03/11/2026		F(1)		175	D	$0.169	10,429(2)	D
Common Stock	05/31/2026		F(1)		82	D	$3.93	10,347(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. Effective on April 6, 2026, the Issuer effected a 50-for-1 share consolidation of its common stock (the "Share Consolidation"). The amount of securities reported on this Form 4 has been adjusted to reflect the Share Consolidation.

	Christian Vasquez	06/05/2026
	** 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)