Chen Sean Chihhsiang — SEC Form 4 filings
SEC reporting owner CIK 2078559. 6 Form 4 filings on record with FilingPulse; latest filed 2026-09-15.
Transaction summary — filings shown
Covers all 6 filings on record, filed 2025-10-06 to 2026-09-15. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 7 legs across 3 filings — 85,685 shares, $5,706,969 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 9.
- Largest priced transaction: sale of 32,351 shares @ $70.53 ($2,281,826) in Ambiq Micro, Inc., filed 2026-05-18.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Ambiq Micro, Inc. (AMBQ) | President and COO | 6 | — | 7 legs · 85,685 sh · $5,706,969 | 9 |
Form 4 filings — Chen Sean Chihhsiang
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-15 | 4 | Ambiq Micro, Inc. (AMBQ) | Option exercise (M): 15,000 @ $8.12 · Sale (S): 2,600 @ $59.36 · Sale (S): 11,000 @ $60.24 · Sale (S): 1,400 @ $60.83 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2026-09-09 | 4 | Ambiq Micro, Inc. (AMBQ) | Option exercise (M): 15,000 @ $8.12 · Sale (S): 12,874 @ $57.09 · Sale (S): 2,126 @ $57.68 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2026-05-18 | 4 | Ambiq Micro, Inc. (AMBQ) | Option exercise (M): 55,685 @ $5.88 · Sale (S): 32,351 @ $70.53 · Sale (S): 23,334 @ $71.37 · Option exercise (M): 55,685 (derivative) @ $0 | EDGAR |
| 2026-04-02 | 4/A | Ambiq Micro, Inc. (AMBQ) | Grant/award (A): 64,246 @ $0 | EDGAR |
| 2026-03-10 | 4 | Ambiq Micro, Inc. (AMBQ) | Grant/award (A): 64,246 @ $0 | EDGAR |
| 2025-10-06 | 4 | Ambiq Micro, Inc. (AMBQ) | Grant/award (A): 56,029 @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
Need this as JSON?
GET https://api.filingpulse.io/v1/insider-trades?owner_cik=2078559 returns every filing on this page — normalized, with footnotes and derivative legs — and webhooks push new filings to you in seconds. API docs →