WA
IMSR

Whitebox Advisors’s Terrestrial Energy IMSR Stock Holding History

Whitebox Advisors’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
2025
Q4 		– Sell
-115,000
Closed -$1.89M – 530
2025
Q3 		$1.89M Sell
115,000
-203,914
-64% -$2.43M 0.03% 202
2025
Q2 		$3.54M Sell
318,914
-81,086
-20% -$902K 0.08% 143
2025
Q1 		$4.21M Hold
400,000
– – 0.11% 120
2024
Q4 		$4.01M Buy
+400,000
New +$4M 0.12% 102

Other funds holding IMSR

Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $77.1B AUM 42.89% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
SIG
Senator Investment Group New York $2.18B AUM 58.56% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Verition Fund Management
Verition Fund Management Greenwich, Connecticut $15.4B AUM 30.69% 1-Year Est. Return
MI
MMCAP International Grand Cayman, Cayman Islands $1.16B AUM 77.9% 1-Year Est. Return

Whitebox Advisors's IMSR Position: Q4 2025 in Review

Whitebox Advisors sold out of Terrestrial Energy (IMSR) in Q4 2025, closing a stake of 115,000 shares — an estimated $1.89M sold.

Whitebox Advisors first reported a position in IMSR in Q4 2024 and held it in 4 quarters. The position peaked at $4.21M in Q1 2025. 82 funds tracked by Wall St. Rank hold IMSR as of Q4 2025.

  • Whitebox Advisors reported no remaining Terrestrial Energy position as of Q4 2025 after selling out during the quarter.
  • Whitebox Advisors sold 115,000 Terrestrial Energy shares in Q4 2025, an estimated $1.89M.
  • Whitebox Advisors first reported a position in Terrestrial Energy in Q4 2024 and held it in 4 quarters.
  • Whitebox Advisors's Terrestrial Energy position peaked at $4.21M in Q1 2025.
  • 82 funds tracked by Wall St. Rank held Terrestrial Energy as of Q4 2025.

Based on Whitebox Advisors's 13F filing for Q4 2025, filed 17 Feb 2026.