Insiders who reported open-market trades in the last 12 months at the companies Gerald M. Blumenstock files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Russell Low - $1.57M in ACLS purchases and sales in the last 12 months
Todd Sutton - $742K in ACLS purchases and sales in the last 12 months
Robert John Mahoney - $543K in ACLS purchases and sales in the last 12 months
John T. Kurtzweil - $486K in ACLS purchases and sales in the last 12 months
Greg Redinbo - $464K in ACLS purchases and sales in the last 12 months
Gregory B. Graves - $457K in ACLS purchases and sales in the last 12 months
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Gerald M. Blumenstock is a corporate insider, tracked as EVP, Research, Dev. & Eng. of AXCELIS TECHNOLOGIES INC (ACLS). InsiderAlpha holds 7 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Gerald M. Blumenstock last file a Form 4?
The most recent primary Form 4 on record is dated 16 June 2026, one of 7 filings going back to 2025.
Has Gerald M. Blumenstock been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($342K) across all tracked filings.
Gerald M. Blumenstock is EVP, Research, Dev. & Eng. of AXCELIS TECHNOLOGIES INC (ACLS). 7 SEC Form 4 filings on record going back to 2025, most recently on 16 June 2026. Most recent open-market trade: sold $177K of ACLS on 22 May 2026. Lifetime open-market sales: $342K.
Recent transactions
12
The latest 12 SEC Form 4 transactions reported by Gerald M. Blumenstock.
InsiderAlpha's records for Gerald M. Blumenstock go back to 2025: 7 primary Form 4 filings, an average of 3.5 per year. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
