Esaka Fumihide 4/A

What Happened
Esaka Fumihide, CEO of Ambiq Micro, received a grant of 160,616 restricted stock units (RSUs) on March 6, 2026. The reported acquisition price was $0.00 (total $0) because this was an equity award, not a market purchase or sale. The filing submitted April 2, 2026 is an amendment correcting the vesting commencement date.

Key Details

• Transaction date: 2026-03-06; Filed/Amended: 2026-04-02 (this Form 4 is an amendment to correct an administrative error about vesting start date).
• Security and amount: 160,616 RSUs granted; reported price $0.00 (award).
• Shares owned after transaction: Not specified in the excerpt provided.
• Footnote (F1): Each RSU is a contingent right to one share. 25% vests on October 1, 2027, then 1/12 of the total vests quarterly thereafter, subject to continuous service and the Issuer's 2025 Equity Incentive Plan.
• Filing note: This is an amended Form 4 filed solely to correct the vesting commencement date (administrative correction).

Context
RSU grants are compensation awards that convert to shares only as they vest; they are not immediate open-market purchases or sales and therefore don't directly indicate a buying or selling decision. The amendment clarifies when vesting begins but does not change the number of RSUs granted.