Chu Steven

Director · AMPX

As of 2026-09-16, Chu Steven has 12 Form 4 transactions on record across 1 company — 11 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: $1.3MIndirect: $0$1.3Mas of 2026-09-16
  • Direct $1.3M
  • Indirect $0
AMPXdirect137,762 sh$1.3M

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

AMPX · 12 trades
2026-06-12: Award / grant, 10,423 sh ($0)2026-03-12: Sale, 100,000 sh ($1.9M)2026-03-12: Sale, 50,000 sh ($911K)2026-03-12: Option exercise, 86,143 sh ($225K)2026-03-12: Option exercise, 86,143 sh ($225K)2026-03-12: Sale, 5,565 sh ($103K)2026-03-12: Option exercise, 69,422 sh ($43K)2026-03-12: Option exercise, 69,422 sh ($43K)2026-03-10: Sale, 166,632 sh ($3.0M)2026-03-10: Option exercise, 104,132 sh ($65K)2026-03-10: Option exercise, 104,132 sh ($65K)2025-06-13: Award / grant, 44,444 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-03-12AMPXSale100,000 @ $18.65$1.9M−35.3% of holding182,904Form 4
2026-03-12AMPXSale50,000 @ $18.21$911K−27.3% of holding132,904Form 4
2026-03-12AMPXSale5,565 @ $18.53$103K−4.2% of holding127,339Form 4
2026-03-10AMPXSale166,632 @ $17.92$3.0M−56.7% of holding127,339Form 4
8 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-06-12AMPXAward / grant10,423137,762Form 4
2026-03-12AMPXOption exercise86,143213,482Form 4
2026-03-12AMPXOption exercise86,143184,108Form 4
2026-03-12AMPXOption exercise69,4220Form 4
2026-03-12AMPXOption exercise69,422282,904Form 4
2026-03-10AMPXOption exercise104,13269,422Form 4
2026-03-10AMPXOption exercise104,132293,971Form 4
2025-06-13AMPXAward / grant44,444189,839Form 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.