BioAtla, Inc. (BCAB) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-06-05

BioAtla, Inc. (BCAB) has filed 3 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-05. InsiderAlpha tracks every BCAB SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About BioAtla, Inc. (BCAB)

SEC CIK	0001826892

90-Day SEC Filing Activity

Form 4 filings (90d)	3
Latest Form 4 filing	2026-06-05

Recent BCAB Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-05-31	SHORT JAY M PHD	Chief Executive Officer	F — Tax withholding / forfeiture	259	$3.93	$1K	SEC
2026-05-31	Vasquez Christian	Chief Financial Officer	F — Tax withholding / forfeiture	82	$3.93	$322	SEC
2026-05-31	Sievers Eric	Chief Medical Officer	F — Tax withholding / forfeiture	134	$3.93	$527	SEC
2026-03-12	SHORT JAY M PHD	Chief Executive Officer	F — Tax withholding / forfeiture	639	$0.17	$107	SEC
2026-03-11	SHORT JAY M PHD	Chief Executive Officer	A — Grant or award	430.0K	$0.00	—	SEC
2026-03-11	Sievers Eric	Chief Medical Officer	F — Tax withholding / forfeiture	360	$0.17	$61	SEC
2026-03-11	Vasquez Christian	Chief Financial Officer	F — Tax withholding / forfeiture	175	$0.17	$30	SEC
2026-03-10	Vasquez Christian	Chief Financial Officer	A — Grant or award	240.0K	$0.00	—	SEC
2026-03-10	Sievers Eric	Chief Medical Officer	A — Grant or award	240.0K	$0.00	—	SEC
2026-02-28	SHORT JAY M PHD	Chief Executive Officer	F — Tax withholding / forfeiture	7.7K	$0.25	$2K	SEC
2026-02-28	Vasquez Christian	Chief Financial Officer	F — Tax withholding / forfeiture	1.8K	$0.25	$445	SEC
2026-02-28	WALDRON RICHARD A	Former Chief Financial Officer	F — Tax withholding / forfeiture	2.7K	$0.25	$674	SEC
2026-02-28	Sievers Eric	Chief Medical Officer	F — Tax withholding / forfeiture	3.1K	$0.25	$776	SEC
2025-11-30	Sievers Eric	Chief Medical Officer	F — Tax withholding / forfeiture	2.7K	$0.90	$2K	SEC
2025-11-30	WALDRON RICHARD A	Chief Financial Officer	F — Tax withholding / forfeiture	2.4K	$0.90	$2K	SEC

All transactions sourced from SEC EDGAR Form 4 filings for BioAtla, Inc. (BCAB). Updated in real time as new filings are submitted to the SEC.

Most-Active BCAB Insiders — Last 90 Days

Insider	Form 4 filings	Total transaction value
SHORT JAY M PHD	2	$1K
Sievers Eric	2	$587
Vasquez Christian	2	$352

Recent BCAB Form 8-K Material Events

2026-04-06 — Other · neutral [SEC]
Trading halt (T3) for BCAB. BCAB
2026-04-02 — Item 8.01, 9.01 · Acquisition · neutral [SEC]
BioAtla filed a Certificate of Merger on April 2, 2026, with the merger becoming effective on April 6, 2026. The merger involves a 50-to-1 reverse stock split, where every 50 shares of common stock will be converted into 1 share. This is an administrative completion of a previous
2026-04-02 — Other · neutral [SEC]
Trading halt (T1) for BCAB. BCAB
2026-03-31 — Item 2.02, 7.01 · Earnings · neutral [SEC]
BioAtla announced its financial results for Q4 and fiscal year 2025 on March 31, 2026, along with an updated corporate presentation for investor meetings. The filing provides standard financial reporting without explicit beat/miss language or forward guidance changes.
2026-03-23 — Item 5.02, 5.07 · Leadership · neutral [SEC]
BioAtla's Compensation Committee approved a retention bonus program for certain executives including CFO Christian Vasquez and Chief Medical Officer Dr. Eric Sievers, contingent on achieving financial and capital raising milestones by May 31 and August 31, 2026. The company also

Recent Insider Filings

2026-06-05 — Vasquez Christian (Chief Financial Officer)
2026-06-05 — SHORT JAY M PHD (Chief Executive Officer)
2026-06-05 — Sievers Eric (Chief Medical Officer)
2026-03-12 — Sievers Eric (Chief Medical Officer)
2026-03-12 — SHORT JAY M PHD (Chief Executive Officer)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in BCAB insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

BCAB Insider Trading — FAQ

What is the latest insider trade for BCAB?: BioAtla, Inc. (BCAB) had 3 insider filings in the last 90 days, with the most recent on 2026-06-05. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying BCAB stock?: 0 insider purchases of BCAB were filed in the last 90 days.
How many insiders are selling BCAB stock?: 0 insider sales of BCAB were filed in the last 90 days.
Where can I see BCAB SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every BCAB SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

Learn More

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