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Mary Z. Luo

CIK 1611156 · COO, Chief Scientist, Chairman · last filed 2026-03-06

Mary Z. Luo is a COO, Chief Scientist, Chairman who has filed 29 SEC Form 4 insider transactions across 1 company since 2015. The most recent filing shows the insider had shares withheld for taxes covering $327.4K of AMPH on Mar 6, 2026. Across all open-market trades the lifetime net is −$46.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $224.1M across reported positions. 62 SEC filings were submitted jointly with Jack Y. Zhang.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$224.14M

Companies

1

Total Filings

29

Lifetime Open-Market Net

-$46.15M

Filer Profile

Reported Address
11570 6TH STREET
RANCHO CUCAMONGA, CA 91730
Related Filers
Jack Y. Zhang — 62 joint filings, latest 2026-03-17
Applied Physics & Chemistry Laboratories, Inc. — 6 joint filings, latest 2021-02-18
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
AMPH COO, Chief Scientist, Chairman 9,669,569 $23.18 $224.14M -$46.15M 26 2026-03-06

Recent Filings

29 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-03-06 AMPH Tax (F) −16,402 -$327.4K EDGAR
2025-06-16 AMPH Exer (M) +400,000 $5.21M EDGAR
2024-11-12 AMPH Gift (G) −500,000 $0 EDGAR
2024-01-11 AMPH Sell (S) −262,772 -$14.34M EDGAR
2024-01-10 AMPH Notice (144) −131,386 -$7.17M EDGAR
2024-01-09 AMPH Notice (144) −86,156 -$5.05M EDGAR
2024-01-08 AMPH Notice (144) −133,644 -$7.88M EDGAR
2023-03-17 AMPH Tax (F) −22,474 -$827.9K EDGAR
2023-03-08 AMPH Grant (A) +231,368 $0 EDGAR
2022-05-20 AMPH Sell (S) −217,552 -$7.40M EDGAR
Showing 1–10 of 29
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.