A Form 4 filed on September 15, 2026, with the SEC discloses that Zhang Ker, a director of Ambiq Micro, Inc. (AMBQ), sold a total of 10,000 shares of common stock on September 11, 2026.

Key Highlights

  • Reporting person: Zhang Ker, identified as a Director of Ambiq Micro, Inc.
  • First transaction: 9,100 shares of common stock sold on 09/11/2026 at a weighted average price of $63.3856 per share, in multiple transactions ranging from $62.85 to $63.84 per share.
  • Second transaction: 900 shares sold on 09/11/2026 at a weighted average price of $63.9467 per share, in multiple transactions ranging from $63.87 to $64.05 per share.
  • Beneficial ownership after transactions: 20,366 shares of common stock held directly following both sales.
  • Ownership form: All shares reported as directly held.

Zhang Ker's Share Sales and Remaining Stake in Ambiq Micro

According to the filing, Zhang Ker, a director at Ambiq Micro, Inc. (AMBQ), disposed of common stock in two separate transactions on September 11, 2026. The first sale involved 9,100 shares at a weighted average price of $63.3856 per share. The filing notes that these shares were sold across multiple transactions at prices ranging from $62.85 to $63.84 per share, and that the weighted average is reported in the transaction table.

The second transaction covered 900 shares sold at a weighted average price of $63.9467 per share, with individual sale prices ranging from $63.87 to $64.05 per share, also across multiple transactions. Both transaction codes are listed as "S," indicating open-market sales. Following these disposals, the filing reports that Zhang Ker directly beneficially owns 20,366 shares of Ambiq Micro common stock.

The filing was signed by Jeffrey Winzeler as Attorney-in-Fact on September 15, 2026. According to the footnotes, the reporting person has undertaken to provide full information regarding the number of shares sold at each separate price to the issuer, any security holder, or SEC staff upon request. No derivative securities transactions were reported in Table II of this filing.

What Was Disclosed

The Form 4 discloses two open-market sales of Ambiq Micro common stock totaling 10,000 shares by Director Zhang Ker on September 11, 2026, with 20,366 shares remaining in direct beneficial ownership after the transactions.