AMPX Amprius Technologies

• None no insider bought on the open market
• $16.2M sold by 4 insiders outside a trading plan
• $64M sold by 2 insiders under 10b5-1 plans

1. Insider
   Trade
   Value
   Traded, filed
2. Thomas M Stepien CEO
   Sale
   $80K 8,000 shares at $10.03 1.3% of stake
   Traded Aug 24 Filed Aug 25
   ↗
3. Donald R Dixon Director
   Sale
   $1.5M 85,000 shares at $17.17 19% of stake
   Traded Jun 15 Filed Jun 16
   ↗
4. Donald R Dixon Director
   Sale
   $765K 40,000 shares at $19.13 8.3% of stake
   Traded Jun 9 Filed Jun 11
   ↗
5. Thomas M Stepien CEO
   Sale
   $42K 2,000 shares at $20.97 0.3% of stake
   Traded Jun 4 Filed Jun 5
   ↗
6. Donald R Dixon Director
   Sale
   $320K 17,895 shares at $17.90 3.6% of stake
   Traded May 26 Filed May 28
   ↗
7. Kang Sun Director
   Planned sale
   $23.9M 1,500,000 shares at $15.91 53% of stake
   Traded Apr 1 Filed Apr 2
   ↗
8. Kang Sun Director
   Planned sale
   $4.1M 217,869 shares at $18.80 79% of stake
   Traded Mar 23 Filed Mar 24
   ↗
9. Wen Hsuan Hsieh Director
   Sale
   $7.6M 413,146 shares at $18.44 90% of stake
   Traded Mar 12 Filed Mar 13
   ↗
10. Steven Chu Director
    Sale
    $5.9M 322,197 shares at $18.20 72% of stake
    Traded Mar 10–12 Filed Mar 12
    ↗
11. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $476K 39,690 shares at $12.00 5% of stake
    Traded Jan 28 Filed Jan 30
    ↗
12. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $6.8M 567,707 shares at $12.03 43% of stake
    Traded Jan 21–23 Filed Jan 23
    ↗
13. Kang Sun Director
    Planned sale
    $11M 993,733 shares at $11.06 42% of stake
    Traded Jan 16–20 Filed Jan 20
    ↗
14. Kang Sun Director
    Planned sale
    $5.1M 506,267 shares at $10.10 27% of stake
    Traded Jan 12 Filed Jan 14
    ↗
15. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $2.1M 198,255 shares at $10.51 21% of stake
    Traded Dec 11, 2025 Filed Dec 15, 2025
    ↗
16. Kang Sun CEO
    Planned sale
    $10.6M 1,000,000 shares at $10.60 40% of stake
    Traded Nov 17, 2025 Filed Nov 19, 2025
    ↗

Also filed in the last 12 months, not counted as buying or selling: 26 option exercises, 13 sales to cover taxes, 10 stock grants, and 7 gifts.