Stepien Thomas M Insider Trading Activity (AMPX)

Summary

Updated Jul 16, 2026

Stepien Thomas M has filed 4 SEC Form 4 filings across 1 company in the last 90 days — selling. Lifetime open-market sales: $1.01M.

Profile

Thomas M. Stepien is the Chief Executive Officer of Amprius Technologies, Inc., a company focused on advanced battery technology. He has a background in engineering and extensive experience in the technology sector, particularly in roles that involve innovation and product development.

Role	Chief Executive Officer, Director
Notability	70/100

Board memberships

Amprius Technologies, Inc.

Awards & honors

Leadership in battery technology innovation
CEO of Amprius Technologies, Inc.

Recent Transactions

Date	Ticker	Company	Code	Shares	Price	Value
2026-06-05	AMPX	Amprius Technologies, Inc.	S — Open-market sale	2.0K	$20.97	$42K
2026-06-05	AMPX	Amprius Technologies, Inc.	G — Bona-fide gift	36.9K	$0.00
2026-06-05	AMPX	Amprius Technologies, Inc.	G — Bona-fide gift	36.9K	$0.00
2026-06-05	AMPX	Amprius Technologies, Inc.	G — Bona-fide gift	30.4K	$0.00
2026-05-28	AMPX	Amprius Technologies, Inc.	S — Open-market sale	4.4K	$17.19	$75K
2026-05-26	AMPX	Amprius Technologies, Inc.	S — Open-market sale	60.7K	$14.79	$898K
2026-05-07	AMPX	Amprius Technologies, Inc.	A — Grant or award	200.0K	$0.00
2026-03-06	AMPX	Amprius Technologies, Inc.	A — Grant or award	150.0K	$0.00

Frequently Asked Questions

Who is Stepien Thomas M?

How many SEC Form 4 filings has Stepien Thomas M submitted recently?

4 primary Form 4 filings in the last 90 days, covering 1 company.

Has Stepien Thomas M been buying or selling stock?

Recorded transactions: 0 open-market purchases () and 3 open-market sales ($1.01M) across all tracked filings.

Where can I see all of Stepien Thomas M's SEC filings?

All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.

Stepien Thomas M — SEC Form 4 Insider Trading Activity