IMSR · Insider trading · 13F holders · Congress trades
Terrestrial Energy Inc. (IMSR)
Who is buying and selling IMSR: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 4
- Insider buys, 90 days
- $112K
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
IMSR at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 3 IMSR insiders filed 3 open-market purchases worth $112K on SEC Form 4.
- 4 13F filers hold IMSR among their 50 largest positions, worth $4.7M combined. The biggest bets by portfolio weight are Vennlight Capital Management, LP (1.7%), Yorkville Advisors Global, LP (1.0%) and Creek Drive Management Group LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
- No member of Congress has disclosed a trade in IMSR.
- IMSR last closed at $3.46 on Oct 29, 2026.
IMSR insider trading
Between Aug 1, 2026 and Oct 29, 2026, 3 IMSR insiders filed 3 open-market purchases worth $112K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 15, 2026 | Pardee Charles G | Director | Buy | 7,500 | $2.95 | $22K | SEC |
| Oct 14, 2026 | Irish Simon | Chief Executive Officer, Director | Buy | 16,900 | $3.01 | $51K | SEC |
| Oct 13, 2026 | Buckman Frederick W | Director | Buy | 12,000 | $3.28 | $39K | SEC |
Who owns IMSR? Hedge funds and superinvestors
4 13F filers hold IMSR among their 50 largest positions, worth $4.7M combined. The biggest bets by portfolio weight are Vennlight Capital Management, LP (1.7%), Yorkville Advisors Global, LP (1.0%) and Creek Drive Management Group LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Vennlight Capital Management, LPHedge fund | 1.7% | $2.5M | 353,010 | -38.7% shares | Q2 2026 |
| Creek Drive Management Group LLCHedge fund | 0.8% | $1.2M | 175,000 | -47.0% shares | Q2 2026 |
| Yorkville Advisors Global, LPHedge fund | 1.0% | $864K | 122,000 | +0.0% shares | Q2 2026 |
| Flax Pond Capital, LLCWealth manager | 0.1% | $126K | 21,000 | +31.3% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 4). Screen IMSR in the grand portfolio →
IMSR stock trades by members of Congress
No member of Congress has disclosed a trade in IMSR.
Analysis mentioning IMSR
Posts from the blog that cover Terrestrial Energy Inc., newest first.
IMSR questions and answers
Are insiders buying IMSR stock?
Between Aug 1, 2026 and Oct 29, 2026, 3 IMSR insiders filed 3 open-market purchases worth $112K on SEC Form 4.
Which hedge funds own IMSR?
4 13F filers hold IMSR among their 50 largest positions, worth $4.7M combined. The biggest bets by portfolio weight are Vennlight Capital Management, LP (1.7%), Yorkville Advisors Global, LP (1.0%) and Creek Drive Management Group LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
Has Congress traded IMSR?
No member of Congress has disclosed a trade in IMSR.
Who is the largest holder of IMSR?
Among 13F filers, Vennlight Capital Management, LP reports the largest IMSR position, $2.5M (353,010 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Vennlight Capital Management, LP's: 1.7% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.