Summary
Updated Aug 31, 2026
Frederick W. Buckman is Director of Terrestrial Energy Inc. /DE/ (IMSR). 1 SEC Form 4 filing on record, dated 22 December 2025.
Trading Pattern
InsiderAlpha's records for Frederick W. Buckman go back to 2025: 1 primary Form 4 filing, an average of 0.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Most Active Insiders Right Now
Frederick W. Buckman has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- John G. Danhakl - $410.21M of LTH open-market activity in the last 90 days
- Mark A. Stevens - $407.10M of NVDA open-market activity in the last 90 days
- Frank Slootman - $405.01M of SNOW open-market activity in the last 90 days
- Xuning Wang - $401.19M of SN open-market activity in the last 90 days
- Fairmount Funds Management LLC - $399.66M of SYRE open-market activity in the last 90 days
- Andreas Bechtolsheim - $393.27M of ANET open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Frederick W. Buckman?
Frederick W. Buckman is a corporate insider, tracked as Director of Terrestrial Energy Inc. /DE/ (IMSR). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Frederick W. Buckman last file a Form 4?
The only primary Form 4 on record is dated 22 December 2025.
Where can I see all of Frederick W. Buckman's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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