Tzuo Tien

Director · Officer · Ten-percent owner · AMPL, ZUO

As of 2026-09-16, Tzuo Tien has 27 Form 4 transactions on record across 2 companies — 4 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: $1.4MIndirect: $0$1.4Mas of 2026-09-16
  • Direct $1.4M
  • Indirect $0
AMPLdirect101,601 sh$1.4M

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

ZUO · 20 trades
2025-02-14: Disposition, 7,698,605 sh ($77.0M)2025-02-14: Disposition, 640,542 sh ($6.4M)2025-02-14: Disposition, 600,000 sh ($6.0M)2025-02-14: Disposition, 291,669 sh ($2.9M)2025-02-14: Disposition, 225,000 sh ($2.3M)2025-02-14: Disposition, 110,104 sh ($1.1M)2025-02-14: Disposition, 12,500 sh ($125K)2025-02-14: Disposition, 300,000 sh ($0)2025-02-14: Disposition, 350,000 sh ($0)2025-02-14: Disposition, 500,000 sh ($0)2025-02-14: Disposition, 362,406 sh2025-02-14: Disposition, 362,406 sh2025-02-03: Award / grant, 600,000 sh ($0)2025-01-02: Sale, 48,569 sh ($482K)2024-12-31: Option exercise, 12,500 sh ($0)2024-12-31: Option exercise, 25,000 sh ($0)2024-12-31: Option exercise, 12,500 sh ($0)2024-12-31: Option exercise, 58,333 sh ($0)2024-12-31: Option exercise, 25,000 sh ($0)2024-12-31: Option exercise, 58,333 sh ($0)
AMPL · 7 trades
2026-07-05: Award / grant, 1,521 sh ($0)2026-04-05: Award / grant, 1,538 sh ($0)2026-01-05: Award / grant, 999 sh ($0)2025-10-05: Award / grant, 977 sh ($0)2025-07-05: Award / grant, 894 sh ($0)2025-04-05: Award / grant, 398 sh ($0)2025-02-22: Award / grant, 44,462 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2025-01-02ZUOSale48,569 @ $9.93$482K−30.5% of holding110,576Form 4
26 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-07-05AMPLAward / grant1,521101,601Form 4
2026-04-05AMPLAward / grant1,538100,080Form 4
2026-01-05AMPLAward / grant99998,542Form 4
2025-10-05AMPLAward / grant97797,543Form 4
2025-07-05AMPLAward / grant89496,566Form 4
2025-04-05AMPLAward / grant39895,672Form 4
2025-02-22AMPLAward / grant44,46295,274Form 4
2025-02-14ZUODisposition7,698,6050Form 4
2025-02-14ZUODisposition640,5420Form 4
2025-02-14ZUODisposition600,0000Form 4
2025-02-14ZUODisposition291,6690Form 4
2025-02-14ZUODisposition225,0000Form 4
2025-02-14ZUODisposition110,1040Form 4
2025-02-14ZUODisposition12,5000Form 4
2025-02-14ZUODisposition300,0000Form 4
2025-02-14ZUODisposition350,0000Form 4
2025-02-14ZUODisposition500,0000Form 4
2025-02-14ZUODisposition362,4060Form 4
2025-02-14ZUODisposition362,4060Form 4
2025-02-03ZUOAward / grant600,000600,000Form 4
2024-12-31ZUOOption exercise12,50012,500Form 4
2024-12-31ZUOOption exercise25,000159,145Form 4
2024-12-31ZUOOption exercise12,50075,812Form 4
2024-12-31ZUOOption exercise58,333134,145Form 4
2024-12-31ZUOOption exercise25,000225,000Form 4
2024-12-31ZUOOption exercise58,333291,669Form 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.