|4Feb 10, 8:08 PM ET

Esaka Fumihide 4

4 · Ambiq Micro, Inc. · Filed Feb 10, 2026

Research Summary

AI-generated summary of this filing

Updated

Ambiq Micro (AMBQ) CEO Esaka Exercises Options for 53,660 Shares

What Happened

  • CEO Fumihide Esaka exercised stock options on 2025-10-07 to acquire 53,660 shares at $5.88 per share, paying $315,521 in total. The Form 4 also reports a contemporaneous disposition/conversion of the same 53,660 shares at $0 (recorded as a derivative transaction, code M).

Key Details

  • Transaction date: 2025-10-07; Form 4 filed: 2026-02-10 (filed ~4 months after the transaction).
  • Exercise price paid: $5.88 per share; total cash paid: $315,521.
  • Shares acquired: 53,660; same number shown as converted/disposed as a derivative at $0.
  • Transaction code: M (exercise or conversion of a derivative).
  • Footnote: The option vested on a schedule that began Dec 1, 2016 (1/4 then monthly 1/48 increments) and was early exercisable but subject to the issuer’s right to repurchase (F1). This repurchase right likely explains the immediate $0 disposal/conversion entry.
  • Shares owned after the transaction: not specified in the provided data.

Context

  • This filing documents an option exercise (a form of acquiring shares) rather than an open-market buy or sale. The simultaneous $0 disposal/conversion is consistent with early exercise terms that allow the company to repurchase shares; it does not necessarily indicate an open-market sale. The Form 4 was filed months after the transaction, which is later than the typical 2-business-day reporting window.

Insider Transaction Report

Form 4
Period: 2025-10-07
Esaka Fumihide
DirectorChief Executive Officer
Transactions
  • Exercise/Conversion

    Common Stock

    2025-10-07$5.88/sh+53,660$315,521230,573 total
  • Exercise/Conversion

    Stock Option (Right to Buy)

    [F1]
    2025-10-0753,6600 total
    Exercise: $5.88Exp: 2026-01-11Common Stock (53,660 underlying)
Footnotes (1)
  • [F1]1/4 of the shares subject to the option vested on December 1, 2016, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service. The shares subject to this option are early exercisable, subject to the Issuer's right to repurchase.
Signature
/s/ Jeffrey Winzeler, Attorney-in-Fact|2026-02-10

Documents

1 file
  • 4
    form4-02112026_010246.xmlPrimary