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SEC Edgar

Terrestrial Energy Inc. /DE/

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Terrestrial Energy Inc. /DE/

CIK 0002019804IMSRIMSRW· quarter ending 2026-06-30
Shares outstanding
105,935,254
as of 2026-08-11 · 10-Q cover page, filed 2026-08-11
Held by 13F filers
12,270,437
selection includes debt or preferreds — no % of shares outstanding
Holders
24
-2 vs 2026-03-31 · 3 new, 5 exited
Value
$43.3M
shares +11.8% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-11, as of 2026-08-11)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stockIMSR · NASDAQ105,935,25421,561,95820.4%110881454102

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
881454102COM SHS11021,561,958105,935,25420.4%$151.4M5 call / 5 put13DGholders →
881454110*W EXP 10/28/203not common2412,270,437——$43.3M1 call / 0 putprefixholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 3 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (24 of 24 · 881454110)

change vs 2026-03-31
#FilerShares / principal% of classValueChange
1LMR Partners LLP3,246,410—$11.0M-101,100 (-3.0%)
2CANTOR FITZGERALD, L. P.2,165,702—$7.1M+1,082,651 (+100.0%)
3Hudson Bay Capital Management LP1,296,174—$4.4M-6,876 (-0.5%)
4PEAK6 LLC1,236,146—$4.2M+50,000 (+4.2%)
5Caption Management, LLC865,372—$2.9M—
6ARISTEIA CAPITAL, L.L.C.840,047—$2.8M+104,654 (+14.2%)
7Magnetar Financial LLC723,000—$2.4M-57,000 (-7.3%)
8BOOTHBAY FUND MANAGEMENT, LLC621,000—$4.4M+231,000 (+59.2%)
9MORGAN STANLEY203,165—$687K-77,603 (-27.6%)
10Linden Advisors LP194,560—$648K—
11Arosa Capital Management LP175,000—$592K—
12Periscope Capital Inc.152,500—$418K—
13Yorkville Advisors Global, LP152,499—$515KNEW
14CastleKnight Management LP73,200—$239K—
15Saba Capital Management, L.P.65,681—$219K—
16Walleye Capital LLC52,616—$178K-87,370 (-62.4%)
17WOLVERINE ASSET MANAGEMENT LLC50,067—$169K+1,345 (+2.8%)
18Alberta Investment Management Corp50,000—$169K—
19Meteora Capital, LLC43,200—$146KNEW
20Virtu Financial LLC23,041—$75K-5,380 (-18.9%)
21Stoic Point Capital Management LLC13,402—$45K—
22US BANCORP \DE\11,655—$39KNEW
23Clear Street Group Inc.10,000—$34K—
24Rockefeller Capital Management L.P.6,000—$20K—
Exited since 2026-03-31 (5 filers; largest 5 shown)
Balyasny Asset Management L.P.−40,743
Advisory Services Network, LLC−6,050
Federation des caisses Desjardins du Quebec−2,000
OSAIC HOLDINGS, INC.−600
SUMMIT SECURITIES GROUP LLC−1

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Citadel Securities LLCSCHEDULE 13G/A2026-02-172025-12-31274,5880.3%
Kenneth GriffinSCHEDULE 13G/A2026-02-172025-12-312,303,7962.2%
Citadel Advisors Holdings LPSCHEDULE 13G/A2026-02-172025-12-312,029,2081.9%
Citadel Advisors LLCSCHEDULE 13G/A2026-02-172025-12-312,029,2081.9%
Citadel GP LLCSCHEDULE 13G/A2026-02-172025-12-312,029,2081.9%
Citadel Securities GP LLCSCHEDULE 13G/A2026-02-172025-12-31274,5880.3%
Citadel Securities Group LPSCHEDULE 13G/A2026-02-172025-12-31274,5880.3%
Roberto M. Sella 2012 Family TrustSCHEDULE 13G2026-01-222025-10-291,538,3191.44%
Roberto Marco SellaSCHEDULE 13G2026-01-222025-10-2915,378,68914.34%
LL Charitable FoundationSCHEDULE 13G2026-01-222025-10-29653,3340.62%
Linden Capital L.P.SCHEDULE 13G/A2025-11-122025-09-30209,4260.9%
Linden GP LLCSCHEDULE 13G/A2025-11-122025-09-30209,4260.9%
SUPERNOVA MANAGEMENT LLCSCHEDULE 13G/A2025-11-122025-09-30142,3040.62%
Siu Min WongSCHEDULE 13G/A2025-11-122025-09-30209,4260.9%
MAGNETAR FINANCIAL LLCSCHEDULE 13G/A2025-11-122025-09-30142,3040.62%
MAGNETAR CAPITAL PARTNERS LPSCHEDULE 13G/A2025-11-122025-09-30142,3040.62%
DAVID J. SNYDERMANSCHEDULE 13G/A2025-11-122025-09-30142,3040.62%
Linden Advisors LPSCHEDULE 13G/A2025-11-122025-09-30209,4260.9%
David LeBlancSCHEDULE 13D2025-11-042025-10-2811,400,4109.7%
Simon IrishSCHEDULE 13D2025-11-042025-10-2813,586,44512.8%
LMR Partners (Ireland) LimitedSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
Merus Global Investments, LLCSCHEDULE 13G/A2025-08-142025-06-30866,0583.8%
First Trust Capital Management L.P.SCHEDULE 13G/A2025-08-142025-06-301,071,1244.66%
LMR Partners AGSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
LMR PARTNERS (DIFC) LtdSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
Ben LevineSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
LMR Partners LLCSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
LMR Partners LLPSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
LMR PARTNERS LtdSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
Stefan RenoldSCHEDULE 13G/A2025-08-142025-06-30941,2874.1%
FTCS Sub GP LLCSCHEDULE 13G/A2025-08-142025-06-301,071,1244.66%
First Trust Capital Solutions L.P.SCHEDULE 13G/A2025-08-142025-06-301,071,1244.66%
First Trust Merger Arbitrage FundSCHEDULE 13G/A2025-08-142025-06-30959,2834.17%
AQR Capital Management, LLCSCHEDULE 13G/A2025-08-132025-06-301,4490.01%
AQR Capital Management Holdings, LLCSCHEDULE 13G/A2025-08-132025-06-301,4490.01%
AQR Arbitrage, LLCSCHEDULE 13G/A2025-08-132025-06-301,4490.01%
Picton Mahoney Asset ManagementSCHEDULE 13G/A2025-08-062025-06-30942,0814.1%
GOLDMAN SACHS & CO. LLCSCHEDULE 13G/A2025-05-122025-03-31746,4473.2%
THE GOLDMAN SACHS GROUP, INC.SCHEDULE 13G/A2025-05-122025-03-31746,4473.2%
Barclays PLCSCHEDULE 13G/A2025-03-212024-12-311,420,3606.17%
Ramya RaoSCHEDULE 13G2025-02-072024-12-311,420,3606.17%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.