IMSR · Terrestrial Energy Inc. · Shareholders & Ownership

$3.35 +0.41 (+13.95%) Q2 2026 earnings call transcript

Market Cap

$311.45M

105.94M

Volume · Oct 27 3.71M Avg daily vol (3M) 1.57M

Every disclosed holder of IMSR in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns IMSR

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	126	32,708,625	30.88%	Yes
Insiders (Forms 3, 4, 5)	0	0	0.00%	No
13D/G-only blocks	4	40,574,970	38.30%	Yes
Remaining	—	32,651,659	30.82%	Rest
Registered funds (N-PORT, not summed)	24	10,900,888	10.29%	No

Shares outstanding: 105,935,254, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of IMSR

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Sella Roberto Marco Insider CIK 1770593 · Oct 29, 2025 10% Owner, issuer-wide, not summed	13,885,611	13.11%	—	Oct 29, 2025	10% Owner, issuer-wide, not summed
1.1	Roberto Marco Sella 13G CIK 1770593 · Unknown · Oct 29, 2025 Rule 13d-1(c), passive investor	15,378,689	14.52%	—	Oct 29, 2025	Rule 13d-1(c), passive investor
2	Irish Simon Insider CIK 2091865 · Oct 21, 2026 Director, Chief Executive Officer, issuer-wide, not summed	5,695,189	5.38%	+511,580	Oct 21, 2026	Director, Chief Executive Officer, issuer-wide, not summed
2.1	Simon Irish 13D CIK 2091865 · Unknown · Oct 28, 2025 Item 4 purpose: Passive investment, Other	13,586,445	12.83%	—	Oct 28, 2025
3	LMR Partners LLP 13F CIK 1578621 · Exempt reporting adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	3,937,112	3.72%	-101,100	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
4	Global X Uranium ETF Fund S000029442 · Registered fund · Jul 31, 2026 GLOBAL X FUNDS, not summed	3,842,214	3.63%	—	Jul 31, 2026	GLOBAL X FUNDS, not summed
5	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,414,196	3.22%	+2,110,744	Jun 30, 2026	carried, not yet filed for the newest quarter
6	Matthews Shawn Insider CIK 1855118 · Nov 6, 2025 Director, issuer-wide, not summed	3,288,514	3.10%	-2,920,000	Nov 6, 2025	Director, issuer-wide, not summed
7	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	2,699,400	2.55%	+2,017,400	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
8	EXCHANGE TRADED CONCEPTS, LLC 13F CIK 1457320 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,160,074	2.04%	+68,913	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	Range Nuclear Renaissance Index ETF Fund S000083243 · Registered fund · May 31, 2026 EXCHANGE TRADED CONCEPTS TRUST, not summed	2,170,676	2.05%	—	May 31, 2026	EXCHANGE TRADED CONCEPTS TRUST, not summed
9	Hudson Bay Capital Management LP 13F CIK 1393825 · Registered investment adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	1,885,467	1.78%	+130,130	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
10	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,772,173	1.67%	+1,278,596	Jun 30, 2026	carried, not yet filed for the newest quarter
11	PEAK6 LLC 13F CIK 1389958 · Broker-dealer · Jun 30, 2026 carried, not yet filed for the newest quarter	1,236,146	1.17%	+50,000	Jun 30, 2026	carried, not yet filed for the newest quarter
12	HRT FINANCIAL LP 13F CIK 1475597 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,125,849	1.06%	+1,125,849	Jun 30, 2026	carried, not yet filed for the newest quarter
13	CANTOR FITZGERALD, L. P. 13F CIK 1024896 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,082,851	1.02%	-200	Jun 30, 2026	carried, not yet filed for the newest quarter
14	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,074,524	1.01%	-46,361	Jun 30, 2026	carried, not yet filed for the newest quarter
14.1	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	228	0.00%	-52	Jun 30, 2026	iShares Trust, not summed
15	Magnetar Financial LLC 13F CIK 1352851 · Registered investment adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	967,000	0.91%	-57,000	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
16	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	966,797	0.91%	-106,276	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Caption Management, LLC 13F CIK 1706766 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	865,372	0.82%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
18	ARISTEIA CAPITAL, L.L.C. 13F CIK 1080171 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	840,047	0.79%	+104,654	Jun 30, 2026	carried, not yet filed for the newest quarter
19	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	693,934	0.66%	+34,546	Jun 30, 2026	carried, not yet filed for the newest quarter
20	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	667,968	0.63%	-546,809	Jun 30, 2026	carried, not yet filed for the newest quarter
21	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	627,155	0.59%	+28,637	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
22	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	621,000	0.59%	+231,000	Jun 30, 2026	carried, not yet filed for the newest quarter
23	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	615,980	0.58%	+49,663	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
24	Pacer Data & Infrastructure Real Estate ETF Fund S000061573 · Registered fund · Jul 31, 2026 Pacer Funds Trust, not summed	580,548	0.55%	—	Jul 31, 2026	Pacer Funds Trust, not summed
25	Pacer Advisors, Inc. 13F CIK 1616667 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	574,618	0.54%	+574,618	Jun 30, 2026	carried, not yet filed for the newest quarter
26	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	571,832	0.54%	+241,556	Jun 30, 2026	carried, not yet filed for the newest quarter
27	WINTON GROUP Ltd 13F CIK 1612063 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	504,000	0.48%	+7,700	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Verition Fund Management LLC 13F CIK 1454027 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	374,958	0.35%	-70,000	Jun 30, 2026	carried, not yet filed for the newest quarter
29	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	365,772	0.35%	+65,365	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Vennlight Capital Management, LP 13F CIK 2013462 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	353,010	0.33%	-222,489	Jun 30, 2026	carried, not yet filed for the newest quarter
31	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	346,696	0.33%	+1,176	Jun 30, 2026	carried, not yet filed for the newest quarter
32	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	333,599	0.31%	-4,392	Jun 30, 2026	carried, not yet filed for the newest quarter
32.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	249,723	0.24%	-2,214	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
32.2	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	43,831	0.04%	+443	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
32.3	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	38,400	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
33	Periscope Capital Inc. 13F CIK 1695320 · Exempt reporting adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	274,500	0.26%	0	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
34	Yorkville Advisors Global, LP 13F CIK 1838613 · Registered investment adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	274,499	0.26%	+152,499	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
35	HIGHBRIDGE CAPITAL MANAGEMENT LLC 13F CIK 919185 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	244,000	0.23%	+244,000	Jun 30, 2026	carried, not yet filed for the newest quarter
36	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	240,719	0.23%	+240,719	Jun 30, 2026	carried, not yet filed for the newest quarter
37	CastleKnight Management LP 13F CIK 1835751 · Registered investment adviser · Jun 30, 2026 Classes IMSR, IMSRW, carried, not yet filed for the newest quarter	238,600	0.23%	+104,700	Jun 30, 2026	Classes IMSR, IMSRW, carried, not yet filed for the newest quarter
38	Alyeska Investment Group, L.P. 13F CIK 1453072 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	222,000	0.21%	-500,000	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Linden Advisors LP 13G CIK 1349339 · Unknown · Sep 30, 2025 Rule 13d-1(c), passive investor	209,426	0.20%	—	Sep 30, 2025	Rule 13d-1(c), passive investor
40	Linden Advisors LP 13F CIK 1279396 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	194,560	0.18%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
41	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	183,800	0.17%	-224,100	Jun 30, 2026	carried, not yet filed for the newest quarter
42	FNY Investment Advisers, LLC 13F CIK 1742998 · Unknown · Sep 30, 2026	179,235	0.17%	+27,585	Sep 30, 2026
43	Arosa Capital Management LP 13F CIK 1596053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	175,000	0.17%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
44	Creek Drive Management Group LLC 13F CIK 2111824 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	175,000	0.17%	-155,000	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Shay Capital LLC 13F CIK 1723643 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	134,539	0.13%	+16,453	Jun 30, 2026	carried, not yet filed for the newest quarter
46	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	126,539	0.12%	+2,002	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Harraden Circle Investments, LLC 13F CIK 1910592 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	122,000	0.12%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
48	COMMONWEALTH EQUITY SERVICES, LLC 13F CIK 312272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	110,794	0.10%	+10,663	Jun 30, 2026	carried, not yet filed for the newest quarter
49	TORONTO DOMINION BANK 13F CIK 947263 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	110,000	0.10%	-115,974	Jun 30, 2026	carried, not yet filed for the newest quarter
50	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	96,035	0.09%	+96,035	Jun 30, 2026	carried, not yet filed for the newest quarter

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 148 holders

Create a free account to page through every holder, filter by source and group by ultimate parent.

Key facts CIK 2019804 CUSIP 881454102 13F (30d) 10 filings 10 filers Visit website Investor relations