Senator Investment Group’s Terrestrial Energy IMSR Stock Holding History

Senator Investment Group’s Portfolio IMSR Stock Details IMSR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	–	Sell	-900,000	Closed	-$5.5M	–	83
2025 Q4	$5.5M	Buy	+900,000	New	+$12M	0.22%	46
2025 Q3	–	Sell	-340,000	Closed	-$3.77M	–	71
2025 Q2	$3.77M	Buy	+340,000	New	+$3.78M	0.15%	49

Other funds holding IMSR

ETC

Exchange Traded Concepts Oklahoma City, Oklahoma $21.9B AUM 68.6% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return

LMR Partners London, United Kingdom $45.4B AUM 60.68% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

VCM

Vennlight Capital Management Weston, Connecticut $99M AUM 77.4% 1-Year Est. Return

Senator Investment Group's IMSR Position: Q1 2026 in Review

Senator Investment Group sold out of Terrestrial Energy (IMSR) in Q1 2026, closing a stake of 900,000 shares — an estimated $5.5M sold.

Senator Investment Group first reported a position in IMSR in Q2 2025 and held it in 2 quarters. The position peaked at $5.5M in Q4 2025. 88 funds tracked by Wall St. Rank hold IMSR as of Q1 2026.

Senator Investment Group reported no remaining Terrestrial Energy position as of Q1 2026 after selling out during the quarter.
Senator Investment Group sold 900,000 Terrestrial Energy shares in Q1 2026, an estimated $5.5M.
Senator Investment Group first reported a position in Terrestrial Energy in Q2 2025 and held it in 2 quarters.
Senator Investment Group's Terrestrial Energy position peaked at $5.5M in Q4 2025.
88 funds tracked by Wall St. Rank held Terrestrial Energy as of Q1 2026.

Based on Senator Investment Group's 13F filing for Q1 2026, filed 13 May 2026.