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Siren LLC’s Caribou Biosciences CRBU Stock Holding History

Siren LLC’s Portfolio CRBU Stock Details CRBU Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-105,347
Closed -$168K – 108
2025
Q4 		$168K Hold
105,347
– – 0.01% 112
2025
Q3 		$245K Hold
105,347
– – 0.01% 114
2025
Q2 		$133K Hold
105,347
– – 0.01% 109
2025
Q1 		$96.2K Hold
105,347
– – 0.01% 116
2024
Q4 		$168K Hold
105,347
– – 0.01% 118
2024
Q3 		$206K Buy
+105,347
New +$216K 0.01% 110

Other funds holding CRBU

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VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
KCM
Kynam Capital Management Princeton, New Jersey $1.62B AUM 138.67% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Aberdeen Group
Aberdeen Group Edinburgh, United Kingdom $61.9B AUM 29.81% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Siren LLC's CRBU Position: Q1 2026 in Review

Siren LLC sold out of Caribou Biosciences (CRBU) in Q1 2026, closing a stake of 105,347 shares — an estimated $168K sold.

Siren LLC first reported a position in CRBU in Q3 2024 and held it in 6 quarters. The position peaked at $245K in Q3 2025. 137 funds tracked by Wall St. Rank hold CRBU as of Q1 2026.

  • Siren LLC reported no remaining Caribou Biosciences position as of Q1 2026 after selling out during the quarter.
  • Siren LLC sold 105,347 Caribou Biosciences shares in Q1 2026, an estimated $168K.
  • Siren LLC first reported a position in Caribou Biosciences in Q3 2024 and held it in 6 quarters.
  • Siren LLC's Caribou Biosciences position peaked at $245K in Q3 2025.
  • 137 funds tracked by Wall St. Rank held Caribou Biosciences as of Q1 2026.

Based on Siren LLC's 13F filing for Q1 2026, filed 14 May 2026.