Chen Sean Chihhsiang 4
4 · Ambiq Micro, Inc. · Filed May 18, 2026
Research Summary
AI-generated summary of this filing
Ambiq Micro (AMBQ) President Sean Chen Exercises Options, Sells Shares
What Happened
Sean Chihhsiang Chen, President and COO of Ambiq Micro (AMBQ), exercised 55,685 stock options at $5.88 per share (total cost ~$327,428) on May 15, 2026, and sold the resulting 55,685 shares in the open market the same day for combined gross proceeds of approximately $3,947,281. The sales were executed in two tranches (32,351 shares and 23,334 shares) at weighted average prices of $70.53 and $71.37, respectively. This sequence — exercising options and immediately selling the shares — is effectively a cashless exercise followed by open-market sales.
Key Details
- Transaction date: May 15, 2026 (Form 4 filed May 18, 2026 — within the 2-business-day SEC filing window).
- Option exercise: 55,685 shares acquired at $5.88 each; total exercise cost ≈ $327,428.
- Open-market sales: 32,351 shares at a weighted avg $70.53 (≈ $2,281,826) and 23,334 shares at a weighted avg $71.37 (≈ $1,665,455); total proceeds ≈ $3,947,281. Combined avg sale price ≈ $70.89/share.
- Footnote sale price ranges: first tranche prices ranged $70.02–$71.0097; second tranche ranged $71.025–$71.85. (Reporting person can provide per-trade breakdown on request.)
- Derivative reporting: the filing also shows the option converted/terminated (derivative disposition reported at $0.00) consistent with exercise.
- Vesting note: the option originally vested 1/4 on Nov 3, 2017 with 1/48 vesting monthly thereafter (per footnote).
- Shares owned after transaction: not provided in the excerpt supplied.
Context
- This is a common pattern where an insider exercises vested options and immediately sells the shares to capture value or cover exercise/payment — often described as a cashless exercise. It reports both the exercise (an acquisition of shares via derivative conversion) and subsequent open-market sales.
- The filing is factual disclosure of transactions; it does not state the insider’s motivation. Purchases generally carry more directional signal than routine sales tied to option exercises, and in this case the exercise + immediate sale appears to be a liquidity event rather than a new long-term buy.
Insider Transaction Report
Form 4
Chen Sean Chihhsiang
President and COO
Transactions
- Exercise/Conversion
Common Stock
2026-05-15$5.88/sh+55,685$327,428→ 175,960 total - Sale
Common Stock
[F1]2026-05-15$70.53/sh−32,351$2,281,826→ 143,609 total - Sale
Common Stock
[F2]2026-05-15$71.37/sh−23,334$1,665,455→ 120,275 total - Exercise/Conversion
Stock Option (Right to Buy)
[F3]2026-05-15−55,685→ 1 totalExercise: $5.88Exp: 2026-11-02→ Common Stock (55,685 underlying)
Footnotes (3)
- [F1]The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $70.02 to $71.0097 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- [F2]The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $71.025 to $71.85 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- [F3]1/4 of the shares subject to the option vested on November 3, 2017, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.
Signature
/s/ Jeffrey Winzeler, Attorney-in-Fact|2026-05-18