HSIEH Wen Hsuan 4

What Happened
Wen Hsuan Hsieh, a director of Amprius Technologies (AMPX), exercised options (code M) to acquire 270,251 shares at $2.61 per share (cost ≈ $705,355). On the same day (2026-03-12) Hsieh sold a total of 413,146 shares in open-market transactions: 282,500 shares at an average $18.55 (≈ $5,239,245) and 130,646 shares at an average $18.22 (≈ $2,380,788). The filing also records the derivative/option conversion entry corresponding to the exercise. Overall gross proceeds from the open-market sales were about $7.62M; the exercise cost was about $705k.

Key Details

• Transaction date: March 12, 2026; Form 4 filed March 13, 2026 (timely within reporting window).
• Option exercise: 270,251 shares acquired at $2.61 each (≈ $705,355).
• Open-market sales: 282,500 shares at avg $18.55 (price range $18.45–$18.78) and 130,646 shares at avg $18.22 (price range $18.12–$18.39). Average prices are reported; footnotes F2 and F3 give the per-trade ranges.
• Shares owned after the transactions: not specified in the provided filing excerpt.
• Footnote F1: includes 44,444 restricted stock units (RSUs) that are contingent on vesting.
• Exhibit/Remark: Exhibit 24 (Power of Attorney) attached to the filing.

Context
This filing shows an option exercise combined with same-day sales (often a cashless exercise pattern). Exercise (acquisition) is a purchase event, but because the exercised shares and other holdings were sold the same day, the net effect for the director was a substantial disposition. These are routine insider transactions in many cases; the filing is factual and does not indicate the insider’s motives.