Security key
881454110
Terrestrial Energy Inc. /DE/ - *W EXP 10/28/203 (IMSRW)
CUSIP: 881454110
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / *W EXP 10/28/203
- Total 13F shares
- 10,588,156
- Total 13F value
- $27,306,006
- Share change
- -357,023
- SEC-reported price per share
- $2.59
- Number of holders
- 25
- Value change
- -$673,722
- Number of buys
- 8
- Number of sells
- 14
Report period
Q1 2026
Institutions
25
Top holders
10
IMSRW full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 2025
Terrestrial Energy Inc. /DE/ SEC filings
Terrestrial Energy Inc. /DE/ company facts
Broader feeds
Reporting periods
Holder history for CUSIP 881454110
Recent filing periods:
Ownership snapshot
Top reported holders of IMSRW - Terrestrial Energy Inc. /DE/ - *W EXP 10/28/203 (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Roberto Marco Sella
Disclosed value leader
Simon Irish
Comparable rows
15/15
Latest evidence
31 Dec 2025
13D/G
3/4/5
13F
Lead comparable stake: 14%
13D/G row: Roberto Marco Sella
Showing 1-6 of 15 holder rows.
Quick read
Roberto Marco Sella leads the comparable SEC ownership view at 14%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Comparable ownership
Top 5
Roberto Marco Sella
14%
Simon Irish
13%
David Michael LeBlanc
9.7%
BARCLAYS PLC
6.2%
First Trust Capital Management L.P.
4.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Roberto Marco Sella |
13D/G
3/4/5
10%+ Owner
|
14%
|
$93,974,555
15,378,689 shares
|
$0 | 29 Oct 2025 |
| Simon Irish |
3/4/5
13D/G
Chief Executive Officer, Director
|
13%
from 13D/G
|
$98,684,142
5,333,007 shares
mixed-class rows
|
— | 28 Oct 2025 |
| David Michael LeBlanc |
13D/G
David LeBlanc
|
9.7%
|
—
11,400,410 shares
|
$0 | 28 Oct 2025 |
| BARCLAYS PLC |
13D/G
13F
Company
|
6.2%
|
$15,368,295
1,420,360 shares
|
$0 | 31 Dec 2024 |
| First Trust Capital Management L.P. |
13D/G
|
4.7%
|
$11,889,476
1,071,124 shares
|
-$7,523,891 | 30 Jun 2025 |
| PICTON MAHONEY ASSET MANAGEMENT |
13D/G
|
4.1%
|
$10,457,099
942,081 shares
|
-$11,520,901 | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
25
Shares
10,588,156
Rows available
25
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
27
Q1 2026 holders
25
Holder diff
-2
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend