Amprius Technologies, Inc. (AMPX) has 3 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 3 sales totalling $1.3M. Most recent filing: Aug. 25, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
|---|---|---|---|---|---|---|
| Aug. 25, 2026 filed Aug. 21, 2026 | Stefan Constantin Ionel Chief Technology Officer | −$306,931 | 29,681 | −4% | No | |
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| Aug. 25, 2026 filed Aug. 21, 2026 | Sun Kang Director | −$642,186 | 62,101 | −5% | No | |
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| Aug. 25, 2026 filed Aug. 21, 2026 | Stepien Thomas M Chief Executive Officer | −$321,165 | 47,221 | −56% | No | |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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