IMSRNasdaqFabricated Plate Work (Boiler Shops)Fiscal year ends December 31Also trades as IMSRW
Terrestrial Energy Inc. /DE/
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 11, 2026
$2.85−0.20 (-6.56%)
Close on Oct 19, 2026
- Market cap
- $301.92M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
22M
Shares held, 13F filers
Institutional holders
108
38 new, 16 sold out
Net institutional buying
3M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Shawn Matthews | 5,750,000 | 20.00% | 13G (passive) | Aug 19, 2024 |
| First Trust Capital Solutions L.P. | 1,748,952 | 7.60% | 13G (passive) amendment | Mar 31, 2025 |
| Roberto Marco Sella | 15,378,689 | 14.34% | 13G (passive) | Oct 29, 2025 |
| Barclays PLC | 1,420,360 | 6.17% | 13G (passive) amendment | Dec 31, 2024 |
| Ramya Rao | 1,420,360 | 6.17% | 13G (passive) | Dec 31, 2024 |
| Magnetar Capital Partners LP | 1,397,166 | 6.07% | 13G (passive) amendment | Jun 30, 2025 |
| Simon Irish | 13,586,445 | 12.80% | 13D (active) | Oct 28, 2025 |
| AQR Capital Management, LLC | 1,288,674 | 5.60% | 13G (passive) amendment | Mar 31, 2025 |
| The Goldman Sachs Group, Inc. | 1,185,894 | 5.20% | 13G (passive) | Dec 31, 2024 |
| David LeBlanc | 11,400,410 | 9.70% | 13D (active) | Oct 28, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of IMSR | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 3,414,196 | – | $24.17M | +2,110,744 | 0.00% |
| Exchange Traded Concepts, LLC | 2,160,074 | – | $15.29M | +68,913 | 0.07% |
| UBS Group AG | 1,772,173 | – | $12.55M | +1,278,596 | 0.00% |
| Hrt Financial LP | 1,125,849 | – | $7.97K | New | 0.00% |
| BlackRock, Inc. | 1,074,524 | – | $7.61M | −46,361 | 0.00% |
| JPMorgan Chase & Co | 966,797 | – | $6.78M | −106,276 | 0.00% |
| Geode Capital Management, LLC | 693,934 | – | $4.92M | +34,546 | 0.00% |
| LMR Partners LLP | 690,702 | – | $4.89M | – | 0.02% |
| D. E. Shaw & Co., Inc. | 667,968 | – | $4.73M | −546,809 | 0.00% |
| Hudson Bay Capital Management LP | 589,293 | – | $4.17M | +137,006 | 0.01% |
| Pacer Advisors, Inc. | 574,618 | – | $4.07K | New | 0.01% |
| Susquehanna International Group, Llp | 571,832 | – | $4.05M | +241,556 | 0.00% |
| WINTON GROUP Ltd | 504,000 | – | $3.57M | +7,700 | 0.12% |
| Morgan Stanley | 412,815 | – | $2.92M | +127,266 | 0.00% |
| Verition Fund Management LLC | 374,958 | – | $2.65M | −70,000 | 0.01% |
| Vanguard Fiduciary Trust Co | 365,772 | – | $2.59M | +65,365 | 0.00% |
| Vennlight Capital Management, LP | 353,010 | – | $2.50M | −222,489 | 1.68% |
| State Street Corp | 346,696 | – | $2.45M | +1,176 | 0.00% |
| Charles Schwab Investment Management Inc | 333,599 | – | $2.36M | −4,392 | 0.00% |
| Highbridge Capital Management LLC | 244,000 | – | $1.71M | New | 0.04% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|
| Q2 2026 | 108 | 22M | 38 / 29 | 22 / 16 | 8M | 5M |
| Q1 2026 | 88 | 19M | 35 / 19 | 22 / 27 | 7M | 7M |
| Q4 2025 | 82 | 21M | 82 / 0 | 0 / 0 | 21M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of IMSR | Value | % of fund | As of |
|---|---|---|---|---|---|
| Global X Uranium ETF | 3,842,214 | – | $18.87M | 0.35% | Jul 31, 2026 |
| Vanguard Total Stock Market Index Fund | 2,699,400 | – | $19.11M | 0.00% | Jun 30, 2026 |
| Range Nuclear Renaissance Index ETF | 2,170,676 | – | $19.82M | 2.23% | May 31, 2026 |
| Vanguard Extended Market Index Fund | 627,155 | – | $4.44M | 0.00% | Jun 30, 2026 |
| Pacer Data & Infrastructure Real Estate ETF | 580,548 | – | $2.85M | 0.77% | Jul 31, 2026 |
| Fidelity Extended Market Index Fund | 277,078 | – | $2.53M | 0.01% | May 31, 2026 |
| Schwab U.S. Small-Cap ETF | 251,937 | – | $2.30M | 0.01% | May 31, 2026 |
| Fidelity Total Market Index Fund | 106,902 | – | $976.02K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 81,259 | – | $741.89K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 49,569 | – | $452.56K | 0.00% | May 31, 2026 |
| Vanguard Balanced Index Fund | 45,090 | – | $319.24K | 0.00% | Jun 30, 2026 |
| Schwab U.S. Broad Market ETF | 43,388 | – | $396.13K | 0.00% | May 31, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 42,749 | – | $302.66K | 0.00% | Jun 30, 2026 |
| Schwab Total Stock Market Index Fund | 38,400 | – | $188.54K | 0.00% | Jul 31, 2026 |
| Fidelity ZERO Total Market Index Fund | 28,898 | – | $141.89K | 0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | Latest filing |
|---|---|---|---|
| David Michael LeBlanc | Chief Technology Officer, Director | 19,712 | Apr 14, 2026 |
| Simon Irish | Chief Executive Officer, Director | 5,166,709 | Nov 7, 2025 |
| Pamela Beth Cowan | EVP, Engineering | – | Jul 31, 2026 |
| William F. Smith | Chief Operating Officer | – | Apr 14, 2026 |
| Brian Patrick Thrasher | Chief Financial Officer | – | Apr 14, 2026 |
| Steven M. Millsap | General Counsel | – | Apr 14, 2026 |
| Kathryn Ann McCarthy | Director | – | Jul 27, 2026 |
| William D. Johnson | Director | – | Jan 9, 2026 |
| Robert Wood Jones | Director | – | Dec 22, 2025 |
| John Hugh MacDiarmid | Director | 25,946 | Dec 22, 2025 |
| David John Hill | Director | 18,470 | Dec 22, 2025 |
| Charles G. Pardee | Director | 6,758 | Dec 22, 2025 |
| Shawn Matthews | Director | 6,208,514 | Dec 22, 2025 |
| Frederick W. Buckman | Director | 21,599 | Dec 22, 2025 |
| Roberto Marco Sella | 10% owner | 1,641,523 | Feb 17, 2026 |
| HCM Investor Holdings II, LLC | – | 8,963,514 | Nov 13, 2025 |
| Andrew Scott Brenner | – | 50,000 | Oct 30, 2025 |
| Michael J. Connor | – | 50,000 | Oct 30, 2025 |
| Jacob Loveless | – | 50,000 | Oct 30, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| HCM Investor Holdings II, LLC – | Nov 6, 2025 | Other | −2,920,000 | – | – | 2,755,000 |
| Michael J. Connor – | Oct 28, 2025 | Other | +25,000 | – | – | 25,000 |
| Shawn Matthews Director | Oct 28, 2025 | Other | +533,514 | – | – | 533,514 |
| Shawn Matthews Director | Oct 28, 2025 | Other | +5,675,000 | – | – | 5,675,000 |
| Jacob Loveless – | Oct 28, 2025 | Other | +25,000 | – | – | 25,000 |
| Andrew Scott Brenner – | Oct 28, 2025 | Other | +25,000 | – | – | 25,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.