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Tzu Yin Chiu

CIK 1738290 · last filed 2026-05-18

Tzu Yin Chiu is a corporate insider who has filed 15 SEC Form 4 insider transactions across 1 company since 2018. The most recent filing, for ACLS, was dated May 18, 2026. Across all open-market trades the lifetime net is −$3.3M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.4M across reported positions.

"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

$1.36M

Companies

1

Total Filings

15

Lifetime Open-Market Net

-$3.34M

Filer Profile

Reported Address
108 CHERRY HILL DRIVE
BEVERLY, MA 01915
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
ACLS Director 11,843 $115.08 $1.36M -$3.34M 13 2026-05-18

Recent Filings

15 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
2026-05-18 ACLS Grant (A) +1,440 $0 EDGAR
2025-05-15 ACLS Grant (A) +3,586 $0 EDGAR
2024-05-16 ACLS Grant (A) +1,662 $0 EDGAR
2024-05-15 ACLS Grant (A) +1,162 $0 EDGAR
2023-05-16 ACLS Notice (144) −15,000 -$1.94M EDGAR
2023-05-16 ACLS Sell (S) −15,000 -$1.94M EDGAR
2023-05-15 ACLS Grant (A) +1,282 $0 EDGAR
2023-05-09 ACLS Notice (144) −10,000 -$1.19M EDGAR
2023-05-09 ACLS Sell (S) −10,000 -$1.19M EDGAR
2023-02-14 ACLS Sell (S) −1,700 -$216.1K EDGAR
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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.