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AMPX · Amprius Technologies, Inc.

Everything on this page is public record — SEC Form 4 filings and congressional disclosures — alongside any INSIDER SCANNER research case for this company.

Open-market buys0
Open-market sells4
Research cases0
Last filing2026-08-24

Insider flow: Selling only — a count of disclosed transactions, not a rating or a recommendation.

Insider transaction timeline

Every reported transaction, positioned by trade date. Purchases sit above the axis, sales below; circle area is proportional to dollar value. No share-price line is drawn — this feed carries transaction prices only, and a price history inferred from them would imply market data the filings do not contain.

Open-market purchase Open-market sale
2026-08-21 — Sun Kang · sold 62,101 @ $10.34 2026-08-21 — Stefan Constantin Ionel · sold 29,681 @ $10.34 2026-08-21 — Stepien Thomas M · sold 23,529 @ $10.34 2026-08-24 — Stepien Thomas M · sold 8,000 @ $10.03
2026-08-212026-08-24

Insider participation

One row per insider, one cell per reported transaction, shaded by value. Repeat buying and activity clustered in time are visible at a glance.

Stepien Thomas M Chief Executive Officer, Director
Sun Kang Director
Stefan Constantin Ionel Chief Technology Officer
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The analysis built on top of these filings

The filings above are public record and stay public here. What an account adds for $AMPX is the reading of them — and for this company, that is what the list below says it is, no more.

  • Transaction timelineThe [{'transaction_date': '2026-08-24', 'insider_name': 'Stepien Thomas M', 'insider_title': 'Chief Executive Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 8000.0, 'price': 10.03, 'value': 80240.0, 'is_buy': False}, {'transaction_date': '2026-08-21', 'insider_name': 'Sun Kang', 'insider_title': 'Director', 'transaction_type': 'Open-market sell', 'shares': 62101.0, 'price': 10.34, 'value': 642124.34, 'is_buy': False}, {'transaction_date': '2026-08-21', 'insider_name': 'Stefan Constantin Ionel', 'insider_title': 'Chief Technology Officer', 'transaction_type': 'Open-market sell', 'shares': 29681.0, 'price': 10.34, 'value': 306901.54, 'is_buy': False}, {'transaction_date': '2026-08-21', 'insider_name': 'Stepien Thomas M', 'insider_title': 'Chief Executive Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 23529.0, 'price': 10.34, 'value': 243289.86, 'is_buy': False}] reported transactions plotted over the window rather than listed, so concentration is visible.

Not available for AMPX today: no reported open-market purchases in this window, so there is no insider cost basis to compute; no research case — nothing here has cleared the scoring threshold. Both appear on this page on their own if that changes.

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Not financial advice. This page reports public filings and past research output. It is not a recommendation to buy or sell, and no price target here is a prediction. Trade at your own risk.