Chen Sean Chihhsiang

Officer · AMBQ

As of 2026-09-16, Chen Sean Chihhsiang has 15 Form 4 transactions on record across 1 company — 15 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $8.1MIndirect: $0$8.1Mas of 2026-09-16
  • Direct $8.1M
  • Indirect $0
AMBQdirect134,423 sh$8.1M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

AMBQ · 15 trades
2026-09-14: Sale, 11,000 sh ($663K)2026-09-14: Sale, 2,600 sh ($154K)2026-09-14: Option exercise, 15,000 sh ($122K)2026-09-14: Sale, 1,400 sh ($85K)2026-09-14: Option exercise, 15,000 sh ($0)2026-09-04: Sale, 12,874 sh ($735K)2026-09-04: Sale, 2,126 sh ($123K)2026-09-04: Option exercise, 15,000 sh ($122K)2026-09-04: Option exercise, 15,000 sh ($0)2026-05-15: Sale, 32,351 sh ($2.3M)2026-05-15: Sale, 23,334 sh ($1.7M)2026-05-15: Option exercise, 55,685 sh ($327K)2026-05-15: Option exercise, 55,685 sh ($0)2026-03-06: Award / grant, 64,246 sh ($0)2025-10-02: Award / grant, 56,029 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-09-14AMBQSale11,000 @ $60.24$663K−8.3% of holding121,675Form 4
2026-09-14AMBQSale2,600 @ $59.36$154K−1.9% of holding132,675Form 4
2026-09-14AMBQSale1,400 @ $60.83$85K−1.2% of holding120,275Form 4
2026-09-04AMBQSale12,874 @ $57.09$735K−9.5% of holding122,401Form 4
2026-09-04AMBQSale2,126 @ $57.68$123K−1.7% of holding120,275Form 4
2026-05-15AMBQSale32,351 @ $70.53$2.3M−18.4% of holding143,609Form 4
2026-05-15AMBQSale23,334 @ $71.37$1.7M−16.2% of holding120,275Form 4
8 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-09-14AMBQOption exercise15,000135,275Form 4
2026-09-14AMBQOption exercise15,000134,423Form 4
2026-09-04AMBQOption exercise15,000135,275Form 4
2026-09-04AMBQOption exercise15,000149,423Form 4
2026-05-15AMBQOption exercise55,685175,960Form 4
2026-05-15AMBQOption exercise55,6851Form 4
2026-03-06AMBQAward / grant64,246120,275Form 4
2025-10-02AMBQAward / grant56,02956,029Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.