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Gerald M Blumenstock

CIK 1979418 · EVP, Research, Dev. & Eng. · last filed 2026-06-16

Gerald M Blumenstock is an EVP, Research, Dev. & Eng. who has filed 15 SEC Form 4 insider transactions across 1 company since 2023. The most recent filing shows the insider had shares withheld for taxes covering $96.9K of ACLS on Jun 16, 2026. Across all open-market trades the lifetime net is −$613.5K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.3M 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

$2.30M

Companies

1

Total Filings

15

Lifetime Open-Market Net

-$613.5K

Filer Profile

Reported Address
AXCELIS TECHNOLOGIES, INC.
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 EVP, Research, Dev. & Eng. 19,987 $115.08 $2.30M -$613.5K 12 2026-06-16

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
2026-06-16 ACLS Tax (F) −506 -$96.9K EDGAR
2026-05-22 ACLS Sell (S) −1,161 -$177.3K EDGAR
2026-05-21 ACLS Notice (144) −1,161 -$177.3K EDGAR
2026-05-19 ACLS Mixed +4,361 -$169.0K EDGAR
2026-05-15 ACLS Sell (S) −1,015 -$164.7K EDGAR
2026-05-14 ACLS Notice (144) −1,015 -$164.7K EDGAR
2026-03-03 ACLS Tax (F) −1,121 -$97.1K EDGAR
2025-12-12 ACLS Sell (S) −3,034 -$271.4K EDGAR
2025-12-11 ACLS Notice (144) −3,034 -$271.4K EDGAR
2025-06-17 ACLS Tax (F) −506 -$34.9K 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.