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SEC Form 4 reporting owner

Buckman Frederick W

Buckman Frederick W has filed 3 Form 4 transactions reported between December 18, 2025 and October 9, 2026, as Director of Terrestrial Energy Inc. /DE/.

Name as filed: BUCKMAN FREDERICK W

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Buckman Frederick W holds 33,599 shares of IMSR, worth $110K, 0.03% of the company.

As of their Oct 9, 2026 Form 4 (filed Oct 13, 2026) · the filing on SEC EDGAR · 18,669 direct, 14,930 indirect · valued at the live price of $3.26 · 105.9M shares outstanding on Aug 11, 2026

Open-market buys, 24 mo
$39K
1 lines
Open-market sales, 24 mo
None
reported
Companies
1
with Form 4 filings
Latest transaction
Oct 9, 2026
transaction date

Roles and reported holdings

  • IMSRTerrestrial Energy Inc. /DE/
    Dec 18, 2025 – Oct 9, 2026

    Director

    Held directly18,669 sh
    Through Trust14,930 sh

    As of Oct 9, 2026 · Form 4

    24 months: $39K bought

How their buys did since

1 open-market purchase against today’s price: -0.6% on average.

DatePaidReturn
Oct 9, 2026IMSR$3.28-0.6%now $3.26

Each purchase at the price on its Form 4, against the latest trade or close, adjusted for stock splits. Past returns say nothing about future ones.

Transaction history

All 3 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Oct 9, 2026IMSROpen-market purchaseCode P · direct12,000$39K@ $3.28Form 4
Dec 18, 2025IMSRDirectorGrant or awardCode A · direct1,176—Form 4
Dec 18, 2025IMSRDirectorGrant or awardCode A · direct6,703—Form 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 each ownership line is left at by the person’s latest Form 4, 4/A or 5: held directly, and through each trust or entity named on the filing. A second class of common stock that converts into the listed one counts as shares; options and restricted stock units are listed but not counted. Value uses the latest trade or close, and the share of the company uses the latest shares-outstanding count the company reported. Where a filing has not yet been read line by line, the figure comes from the latest direct and indirect lines that traded and is shown as “at least”.

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