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Siren LLC’s Cartesian Therapeutics RNAC Stock Holding History

Siren LLC’s Portfolio RNAC Stock Details RNAC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-563,272
Closed -$5.76M – 129
2025
Q3 		$5.76M Hold
563,272
– – 0.23% 60
2025
Q2 		$5.85M Hold
563,272
– – 0.3% 55
2025
Q1 		$7.42M Sell
563,272
-8,964
-2% -$160K 0.42% 46
2024
Q4 		$10.2M Hold
572,236
– – 0.45% 46
2024
Q3 		$9.22M Buy
+572,236
New +$8.94M 0.46% 47

Other funds holding RNAC

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return
EAM
Erste Asset Management Vienna, Austria $10.8B AUM 38.54% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
PFM
Privium Fund Management Amsterdam, Netherlands $480M AUM 77.45% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Siren LLC's RNAC Position: Q4 2025 in Review

Siren LLC sold out of Cartesian Therapeutics (RNAC) in Q4 2025, closing a stake of 563,272 shares — an estimated $5.76M sold.

Siren LLC first reported a position in RNAC in Q3 2024 and held it in 5 quarters. The position peaked at $10.2M in Q4 2024. 67 funds tracked by Wall St. Rank hold RNAC as of Q4 2025.

  • Siren LLC reported no remaining Cartesian Therapeutics position as of Q4 2025 after selling out during the quarter.
  • Siren LLC sold 563,272 Cartesian Therapeutics shares in Q4 2025, an estimated $5.76M.
  • Siren LLC first reported a position in Cartesian Therapeutics in Q3 2024 and held it in 5 quarters.
  • Siren LLC's Cartesian Therapeutics position peaked at $10.2M in Q4 2024.
  • 67 funds tracked by Wall St. Rank held Cartesian Therapeutics as of Q4 2025.

Based on Siren LLC's 13F filing for Q4 2025, filed 13 Feb 2026.