13F Pro

SEC Form 4 reporting owner

Chen Sean Chihhsiang

Chen Sean Chihhsiang has filed 11 Form 4 transactions reported between March 6, 2026 and September 14, 2026, as President and COO of Ambiq Micro, Inc..

Name as filed: Chen Sean Chihhsiang

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$5.7M
7 lines
Companies
1
with Form 4 filings
Latest transaction
Sep 14, 2026
transaction date

Roles and reported holdings

  • AMBQAmbiq Micro, Inc.
    Mar 6, 2026 – Sep 14, 2026

    President and COO

    Held directly120,275 sh as of Sep 14, 2026 · Form 4

    24 months: $5.7M sold

Transaction history

All 11 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Sep 14, 2026AMBQPresident and COOOpen-market saleCode S · direct1,400$85K@ $60.83Form 4
Sep 14, 2026AMBQPresident and COOOpen-market saleCode S · direct11,000$663K@ $60.24Form 4
Sep 14, 2026AMBQPresident and COOOpen-market saleCode S · direct2,600$154K@ $59.36Form 4
Sep 14, 2026AMBQPresident and COOOption exerciseCode M · direct15,000$122K@ $8.12Form 4
Sep 4, 2026AMBQPresident and COOOpen-market saleCode S · direct2,126$123K@ $57.68Form 4
Sep 4, 2026AMBQPresident and COOOpen-market saleCode S · direct12,874$735K@ $57.09Form 4
Sep 4, 2026AMBQPresident and COOOption exerciseCode M · direct15,000$122K@ $8.12Form 4
May 15, 2026AMBQPresident and COOOpen-market saleCode S · direct23,334$1.7M@ $71.37Form 4
May 15, 2026AMBQPresident and COOOpen-market saleCode S · direct32,351$2.3M@ $70.53Form 4
May 15, 2026AMBQPresident and COOOption exerciseCode M · direct55,685$327K@ $5.88Form 4
Mar 6, 2026AMBQPresident and COOGrant or awardCode A · direct64,246—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.