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Sean Chihhsiang Chen

Insider · President and COO · AMBQ

Sean Chihhsiang Chen files insider transactions with the SEC as a president and coo of Ambiq Micro. We hold 2 disclosed purchases and sales filed since 6 October 2025, 1 of them in the last 90 days.

  • Files forAMBQ
  • Disclosed buys and sells2 in all, 1 in the last 90 days
  • Last disclosure9 September 2026

Positions held

1 post we hold — a term names its own dates; a run of filings only says when they filed
  • Filed 2 October 2025 — 4 September 2026President and COO · Ambiq Micro 12 Form 4 lines · source: SEC Form 4

Every transaction

12 transactions from SEC Form 4 — one row each, sort any column, open a row for the filing
12 of 12 shown
4 Sep 20269 Sep 2026SEC Form 45 dexercised options overnot a tradeAmbiq Micro15,000 sharesup +3.8%up +0.0%
4 Sep 20269 Sep 2026SEC Form 45 dsold on the open marketAmbiq Micro12,874 sharesup +3.8%up +0.0%
4 Sep 20269 Sep 2026SEC Form 45 dsold on the open marketAmbiq Micro2,126 sharesup +3.8%up +0.0%
4 Sep 20269 Sep 2026SEC Form 45 dexercised options overnot a tradeAmbiq Microderivative15,000 sharesup +3.8%up +0.0%
15 May 202618 May 2026SEC Form 43 dexercised options overnot a tradeAmbiq Micro55,685 sharesdown −15.5%down −16.4%
15 May 202618 May 2026SEC Form 43 dsold on the open marketAmbiq Micro32,351 sharesdown −15.5%down −16.4%
15 May 202618 May 2026SEC Form 43 dsold on the open marketAmbiq Micro23,334 sharesdown −15.5%down −16.4%
15 May 202618 May 2026SEC Form 43 dexercised options overnot a tradeAmbiq Microderivative55,685 sharesdown −15.5%down −16.4%
6 Mar 20262 Apr 2026SEC Form 427 dwas grantednot a tradeAmbiq Micro64,246 sharesup +110.0%up +109.0%
6 Mar 202610 Mar 2026SEC Form 44 dwas grantednot a tradeAmbiq Micro64,246 sharesup +110.0%up +94.6%
6 Mar 202610 Mar 2026SEC Form 44 dwas grantednot a tradeAmbiq Micro64,246 sharesup +110.0%up +94.6%
2 Oct 20256 Oct 2025SEC Form 44 dwas grantednot a tradeAmbiq Micro56,029 sharesup +100.9%up +91.0%

Both percentages are the stock’s move, not Sean Chihhsiang Chen’s return: a disclosure gives a band, never an amount, so nobody can say how much was bought or what it made. They run to the last close we hold — 9 Sep 2026, except where a name has since delisted, when the row names its own last session. We publish no close, no volume and no dollar figure behind them. 12 of the 12 rows shown carry a percentage; the rest are dashes with the reason on the row.

Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.

Some filings reach us as photographs of paper rather than as a form we can read as text. Those are shown here only once they have been read and checked, so this page can hold fewer lines than the filings behind it contain. The link on every row opens the original document, which is always the full record.