Amprius Technologies, Inc.
AMPX.WT- 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; no institution reported holding it in 13F filings for Q2 2026; no superinvestor holds it.
Other share classesAMPX
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 |
|---|---|---|---|---|---|---|---|---|---|
| May 24, 2024 (view filing) | May 21-22 | 3 daysLate | Stefan Constantin IonelChief Technology Officer | SSale | −9.39K | $1.34 | −$12.6K | −2.3%395.0K after | 2 lots |
| May 24, 2024 (view filing) | May 21-22 | 3 daysLate | Wallach SandraChief Financial Officer | SSale | −18.8K | $1.34 | −$25.2K | −2.5%730.9K after | 2 lots |
| May 24, 2024 (view filing) | May 21-22 | 3 daysLate | Sun KangSee Remarks | SSale | −35.6K | $1.34 | −$47.8K | −2.5%1.38M after | 2 lots |
| Apr 3, 2024 (view filing)4:13 PM ET | Apr 2 | 1 day | Bornstein JonathanPresident of Amprius Lab | SSale | −126.0K | $2.38 | −$299.6K | −18.4%558.9K after | 10b5-1 |
| Mar 7, 2024 (view filing)5:36 PM ET | Mar 5-6 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $2.88 | −$432.0K | −100.0%0 after | 2 lots10b5-1 |
| Feb 7, 2024 (view filing)6:06 PM ET | Feb 6 | 1 day | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $4.43 | −$663.8K | −100.0%0 after | 10b5-1 |
| Jan 4, 2024 (view filing)5:32 PM ET | Jan 2 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $4.44 | −$666.3K | −100.0%0 after | 2 lots10b5-1 |
| Dec 15, 2023 (view filing) | Dec 13-15 | 2 days | Amprius, Inc.10% Owner | SSale | −300.0K | $3.57 | −$1.07M | −0.5%65.2M after | 3 lots |
| Dec 14, 2023 (view filing) | Dec 12-14 | 2 days | Mirro Justin EDirector | SSale | −405.0K | $3.62 | −$1.47M | −18.5%1.78M after | 6 lots |
| Dec 7, 2023 (view filing)6:39 PM ET | Dec 5-7 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $4.05 | −$608.1K | −100.0%0 after | 3 lots10b5-1 |
| Dec 7, 2023 (view filing) | Dec 5-7 | 2 days | Mirro Justin EDirector | SSale | −90.0K | $4.08 | −$367.6K | −4.5%1.92M after | 6 lots |
| Nov 30, 2023 (view filing) | Nov 28-30 | 2 days | Mirro Justin EDirector | SSale | −150.0K | $3.97 | −$595.8K | −7.1%1.95M after | 6 lots |
| Nov 21, 2023 (view filing)4:50 PM ET | Nov 20 | 1 day | Bornstein JonathanPresident of Amprius Lab | SSale | −27.6K | $3.84 | −$106.1K | −100.0%0 after | 10b5-1 |
| Nov 9, 2023 (view filing)6:04 PM ET | Nov 7-9 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −122.4K | $3.00 | −$366.7K | −100.0%0 after | 3 lots10b5-1 |
| Oct 12, 2023 (view filing)6:55 PM ET | Oct 10-12 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $4.22 | −$632.4K | −100.0%0 after | 3 lots10b5-1 |
| Sep 21, 2023 (view filing)4:44 PM ET | Sep 19-20 | 2 days | Bornstein JonathanPresident of Amprius Lab | SSale | −150.0K | $4.36 | −$654.6K | −100.0%0 after | 2 lots10b5-1 |
| Sep 18, 2023 (view filing) | Sep 14-15 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −80.0K | $3.76 | −$300.5K | −72.9%29.8K after | 2 lots |
| Jun 16, 2023 (view filing) | Jun 14-15 | 2 days | Mirro Justin EDirector | SSale | −111.0K | $9.14 | −$1.01M | −4.3%2.50M after | 2 lots |