Amprius Technologies, Inc.
AMPX- Exchange
- NYSE
- Industry
- Miscellaneous Electrical Machinery, Equipment & Supplies
- SEC CIK
- 0001899287
In the last 90 days, Amprius Technologies, Inc. insiders filed 0 open-market purchases and 3 sales; 261 institutions reported holding it in 13F filings for Q2 2026, worth $1.35B in total; no superinvestor holds it.
Other share classesAMPX.WT
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Amprius Technologies, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 3 filings
- 3 insiders, $1.27M in total
- Insiders trading
- 3
- Net value
- −$1.27M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Amprius Technologies, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Sun Kang | Director | 1,218,397 | Aug 25, 2026 | 11 |
| Stefan Constantin Ionel | Chief Technology Officer | 771,629 | Aug 25, 2026 | 9 |
| Stepien Thomas M | Chief Executive Officer | 37,260Indirect | Aug 25, 2026 | 6 |
| Dixon Donald R | Director | 359,380Indirect | Jun 16, 2026 | 3 |
| Bayless Kathleen A | Director | 216,120 | Jun 16, 2026 | 1 |
| Chu Steven | Director | 137,762 | Jun 16, 2026 | 2 |
| Satterthwaite Livingston | Director | 346,506 | Jun 16, 2026 | 1 |
| HSIEH Wen Hsuan | Director | 44,444 | Mar 13, 2026 | 1 |
| Rodriguez Ricardo C. | Chief Financial Officer | 350,000 | Mar 13, 2026 | 2 |
| Wallach Sandra | Chief Financial Officer | 1,005,275 | Aug 25, 2025 | 0 |
| Bornstein Jonathan | President of Amprius Lab | 422,668 | Mar 12, 2025 | 0 |
| Amprius, Inc. | 10% Owner | 2,500,071 | Oct 25, 2024 | 0 |
| Mirro Justin E | Director | 1,195,000Indirect | Sep 5, 2024 | 0 |
| Gustanski Mary | Director | 146,396 | Jun 7, 2024 | 0 |
| Kensington Capital Sponsor IV LLC | Other: Former 10% holder (see ftn 2) | 0 | Sep 16, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Feb 24, 2026 (view filing) | Feb 23 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −25.4K | $10.16 | −$257.7K | −3.4%723.3K after | |
| Mar 12, 2026 (view filing) | Mar 10-12 | 2 days | Chu StevenDirector | SSale | −322.2K | $18.20 | −$5.86M | −71.7%127.3K after | 4 lots |
| Mar 13, 2026 (view filing) | Mar 12 | 1 day | HSIEH Wen HsuanDirector | SSale | −413.1K | $18.45 | −$7.62M | −90.3%44.4K after | 2 lots |
| Mar 24, 2026 (view filing) | Mar 23 | 1 day | Sun KangDirector | SSale | −217.9K | $18.80 | −$4.10M | −79.4%56.4K after | 2 lots |
| Apr 2, 2026 (view filing) | Apr 1 | 1 day | Sun KangDirector | SSale | −1.50M | $15.90 | −$23.9M | −52.8%1.34M after | 2 lots |
| May 26, 2026 (view filing) | May 21 | 5 days | Sun KangDirector | SSale | −67.8K | $14.79 | −$1.00M | −5.0%1.28M after | |
| May 26, 2026 (view filing) | May 21 | 5 days | Stefan Constantin IonelChief Technology Officer | SSale | −28.8K | $14.79 | −$426.1K | −3.5%804.5K after | |
| May 26, 2026 (view filing) | May 21 | 5 days | Stepien Thomas MChief Executive Officer | SSale | −60.7K | $14.79 | −$897.8K | −8.0%699.3K after | |
| May 28, 2026 (view filing) | May 26 | 2 days | Dixon Donald RDirector | SSale | −17.9K | $17.90 | −$320.3K | −3.6%484.4K after | |
| May 28, 2026 (view filing) | May 27 | 1 day | Sun KangDirector | SSale | −356 | $17.19 | −$6.12K | 0.0%1.28M after | |
| May 28, 2026 (view filing) | May 27 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −3.21K | $17.19 | −$55.1K | −0.4%801.3K after | |
| May 28, 2026 (view filing) | May 27 | 1 day | Stepien Thomas MChief Executive Officer | SSale | −4.38K | $17.19 | −$75.2K | −0.6%694.9K after | |
| Jun 5, 2026 (view filing) | Jun 4 | 1 day | Stepien Thomas MChief Executive Officer | SSale | −2.00K | $20.97 | −$41.9K | −0.3%625.6K after | |
| Jun 11, 2026 (view filing) | Jun 9 | 2 days | Dixon Donald RDirector | SSale | −40.0K | $19.13 | −$765.2K | −8.3%444.4K after | |
| Jun 16, 2026 (view filing) | Jun 15 | 1 day | Dixon Donald RDirector | SSale | −85.0K | $17.17 | −$1.46M | −19.1%359.4K after | |
| Aug 25, 2026 (view filing)5:21 PM ET | Aug 21-24 | 4 days | Stepien Thomas MChief Executive Officer | SSale | −31.5K | $10.26 | −$323.6K | −5.0%594.1K after | 2 lots |
| Aug 25, 2026 (view filing)5:22 PM ET | Aug 21 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −29.7K | $10.34 | −$306.9K | −3.7%771.6K after | |
| Aug 25, 2026 (view filing)5:22 PM ET | Aug 21 | 4 days | Sun KangDirector | SSale | −62.1K | $10.34 | −$642.2K | −4.8%1.22M after |