13F Pro

SEC Form 4 reporting owner

Blumenstock Gerald M

Blumenstock Gerald M has filed 8 Form 4 transactions reported between December 11, 2025 and June 15, 2026, as EVP, Research, Dev. & Eng. of AXCELIS TECHNOLOGIES INC.

Name as filed: Blumenstock Gerald M

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$613K
3 lines
Companies
1
with Form 4 filings
Latest transaction
Jun 15, 2026
transaction date

Roles and reported holdings

  • ACLSAXCELIS TECHNOLOGIES INC
    Dec 11, 2025 – Jun 15, 2026

    EVP, Research, Dev. & Eng.

    Held directly19,987 sh as of Jun 15, 2026 · Form 4

    24 months: $613K sold

Transaction history

All 8 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Jun 15, 2026ACLSEVP, Research, Dev. & Eng.Shares withheld for tax or exercise priceCode F · direct506$97K@ $191.60Form 4
May 21, 2026ACLSEVP, Research, Dev. & Eng.Open-market saleCode S · direct1,161$177K@ $152.70Form 4
May 15, 2026ACLSEVP, Research, Dev. & Eng.Shares withheld for tax or exercise priceCode F · direct345$54K@ $155.18Form 4
May 15, 2026ACLSEVP, Research, Dev. & Eng.Shares withheld for tax or exercise priceCode F · direct744$115K@ $155.18Form 4
May 15, 2026ACLSEVP, Research, Dev. & Eng.Grant or awardCode A · direct2,725—Form 4
May 14, 2026ACLSEVP, Research, Dev. & Eng.Open-market saleCode S · direct1,015$165K@ $162.31Form 4
Mar 2, 2026ACLSEVP, Research, Dev. & Eng.Shares withheld for tax or exercise priceCode F · direct1,121$97K@ $86.58Form 4
Dec 11, 2025ACLSEVP, Research, Dev. & Eng.Open-market saleCode S · direct3,034$271K@ $89.46Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.