Terrestrial Energy Inc.: which funds bought and sold

Institutions that bought and sold Terrestrial Energy shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 67 institutions that filed 13F reports for both quarters added to or opened positions in Terrestrial Energy, and 38 cut or closed them. Together they added a net 2.9M shares, +15.7% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 2.0M shares (−29.9%); index fund managers were net buyers of 2.2M shares (+51.6%). 38 opened a new position and 16 sold out entirely.

Bought, Q2 2026 67 institutions, 38 of them new holders Sold, Q2 2026 38 institutions, 16 of them sold out

Net change, all compared +2.9M shares (+15.7%)

Net change, active managers −2.0M shares (−29.9%), 12 bought, 10 sold

Buyers versus sellers

institutions compared, 124

67 bought 19 38 sold

Active managers and hedge funds 12 bought · 10 sold · −2.0M

Index fund managers 5 bought · 2 sold · +2.2M

Other institutions 50 bought · 26 sold · +2.7M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Vanguard Capital Management LLC Index funds	+2.1M +161.9%	3.4M	$24.2M
UBS Group AG	+1.3M +259.0%	1.8M	$12.5M
HRT Financial LP	+1.1M New position	1.1M	$8M
Pacer Advisors, Inc.	+575K New position	575K	$4.1M
Highbridge Capital Management LLC Hedge fund	+244K New position	244K	$1.7M
Susquehanna International Group, LLP	+242K +73.1%	572K	$4M
Jane Street Group, LLC	+241K New position	241K	$1.7M
Hudson Bay Capital Management LP Hedge fund	+137K +30.3%	589K	$4.2M
Morgan Stanley	+127K +44.6%	413K	$2.9M
Castleknight Management LP Hedge fund	+105K +172.5%	165K	$1.2M
Millennium Management LLC Hedge fund	+96K New position	96K	$679,928
Xtx Topco Ltd	+95K New position	95K	$669,775
Aquatic Capital Management LLC	+89K New position	89K	$629,780
Fny Investment Advisers, LLC	+85K +129.2%	152K	$1.1M
Voloridge Investment Management, LLC Hedge fund	+83K New position	83K	$590,288
Engineers Gate Manager LP Hedge fund	+82K New position	82K	$582,649
Exchange Traded Concepts, LLC	+69K +3.3%	2.2M	$15.3M
Parallax Volatility Advisers, L.P.	+69K New position	69K	$485,107
Vanguard Fiduciary Trust Co Index funds	+65K +21.8%	366K	$2.6M
AQR Capital Management LLC Hedge fund	+60K New position	60K	$423,221

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Highbridge Capital Management LLC Hedge fund	+244K New position	244K	$1.7M
Hudson Bay Capital Management LP Hedge fund	+137K +30.3%	589K	$4.2M
Castleknight Management LP Hedge fund	+105K +172.5%	165K	$1.2M
Millennium Management LLC Hedge fund	+96K New position	96K	$679,928
Voloridge Investment Management, LLC Hedge fund	+83K New position	83K	$590,288
Engineers Gate Manager LP Hedge fund	+82K New position	82K	$582,649
AQR Capital Management LLC Hedge fund	+60K New position	60K	$423,221
Exoduspoint Capital Management, LP Hedge fund	+40K New position	40K	$284,651
Tudor Investment Corp Et Al Hedge fund	+31K +275.2%	42K	$298,953
American Century Companies Inc Active manager	+27K New position	27K	$189,517

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	−1.3M −99.2%	10K	$71,232
D. E. Shaw & Co., Inc. Hedge fund	−547K −45.0%	668K	$4.7M
Alyeska Investment Group, L.P. Hedge fund	−500K −69.3%	222K	$1.6M
Goldman Sachs Group Inc	−337K −85.0%	59K	$420,729
Hite Hedge Asset Management LLC	−240K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−224K −54.9%	184K	$1.3M
Vennlight Capital Management, LP	−222K −38.7%	353K	$2.5M
Creek Drive Management Group LLC	−155K −47.0%	175K	$1.2M
Balyasny Asset Management L.P. Hedge fund	−149K −72.6%	56K	$399,744
Toronto Dominion Bank	−116K −51.3%	110K	$778,800
Bank Of America Corp	−107K −80.8%	25K	$180,051
Jpmorgan Chase & Co	−106K −9.9%	967K	$6.8M
Squarepoint Ops LLC Hedge fund	−88K −50.6%	86K	$605,340
K2 Principal Fund, L.P.	−80K Sold out	0	—
Verition Fund Management LLC Hedge fund	−70K −15.7%	375K	$2.7M
Massar Capital Management, LP	−65K Sold out	0	—
Diametric Capital, LP	−59K Sold out	0	—
Blackrock, Inc. Index funds	−46K −4.1%	1.1M	$7.6M
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	−37K −58.4%	26K	$186,905
Bluefin Capital Management, LLC	−32K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	−1.3M −99.2%	10K	$71,232
D. E. Shaw & Co., Inc. Hedge fund	−547K −45.0%	668K	$4.7M
Alyeska Investment Group, L.P. Hedge fund	−500K −69.3%	222K	$1.6M
Renaissance Technologies LLC Hedge fund	−224K −54.9%	184K	$1.3M
Balyasny Asset Management L.P. Hedge fund	−149K −72.6%	56K	$399,744
Squarepoint Ops LLC Hedge fund	−88K −50.6%	86K	$605,340
Verition Fund Management LLC Hedge fund	−70K −15.7%	375K	$2.7M
Brevan Howard Capital Management LP Hedge fund	−25K Sold out	0	—
Schonfeld Strategic Advisors LLC Hedge fund	−19K Sold out	0	—
Marshall Wace, LLP Hedge fund	−5,999 −22.8%	20K	$143,568

New positions

largest by value

Institution	Shares	Value June 30, 2026
HRT Financial LP	1.1M	$8M
Pacer Advisors, Inc.	575K	$4.1M
Highbridge Capital Management LLCHedge fund	244K	$1.7M
Jane Street Group, LLC	241K	$1.7M
Millennium Management LLCHedge fund	96K	$679,928
Xtx Topco Ltd	95K	$669,775
Aquatic Capital Management LLC	89K	$629,780
Voloridge Investment Management, LLCHedge fund	83K	$590,288
Engineers Gate Manager LPHedge fund	82K	$582,649
Parallax Volatility Advisers, L.P.	69K	$485,107

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Hite Hedge Asset Management LLC	240K	$1.4M
K2 Principal Fund, L.P.	80K	$480,800
Massar Capital Management, LP	65K	$390,325
Diametric Capital, LP	59K	$355,441
Bluefin Capital Management, LLC	32K	$194,940
Brevan Howard Capital Management LPHedge fund	25K	$151,044
Flow Traders U.S. LLC	22K	$129,000
Schonfeld Strategic Advisors LLCHedge fund	19K	$115,620
Level Four Advisory Services, LLC	16K	$98,332
T3 Companies, LLC	16K	$97,851

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 108
Ten largest holders: 61.0%
Index fund managers: 29.5%
Active managers and hedge funds: 21.6%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	12	10	8	2	−2.0M	−29.9%
Index fund managers	5	2	0	0	+2.2M	+51.6%
Other institutions	50	26	30	14	+2.7M	+35.0%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Terrestrial Energy.

Only managers that filed a holdings report for both quarters are compared (124 here). 2 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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