Chen Sean Chihhsiang 4/A

What Happened

• Sean Chihhsiang Chen, President and Chief Operating Officer of Ambiq Micro, was granted 64,246 restricted stock units (RSUs) on March 6, 2026. The grant is reported as an award (transaction code A) with an acquisition price of $0.00 (no cash paid at grant). This Form 4 was amended on April 2, 2026 to correct the RSU vesting commencement date.

Key Details

• Transaction date: March 6, 2026; Form 4 filed (amended) April 2, 2026.
• Security: 64,246 RSUs granted; reported acquisition price: $0.00; total reported value at grant: $0.
• Vesting (footnote): 25% of the RSUs vest on October 1, 2027; thereafter 1/12 of the original grant vests quarterly, subject to continuous service and the Issuer’s 2025 Equity Incentive Plan.
• Post-transaction beneficial ownership: not specified in the provided filing.
• Filing status: Amended filing — amendment corrects an administrative error about the vesting commencement date.

Context

• RSUs are a contingent right to receive shares upon settlement and generally have no immediate cash value until they vest and are settled; they are typically subject to service-based vesting and may have tax implications when they vest. This transaction is an award/grant (not an open-market purchase or sale) and should be viewed as a compensation/retention action rather than a direct buy or sell signal.