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Siren LLC’s Cogent Biosciences COGT Stock Holding History

Siren LLC’s Portfolio COGT Stock Details COGT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$72M Buy
1,859,279
+150,000
+9% +$5.25M 1.46% 21
2026
Q1 		$65.8M Buy
1,709,279
+80,000
+5% +$2.95M 1.82% 15
2025
Q4 		$57.9M Sell
1,629,279
-95,000
-6% -$2.67M 1.73% 18
2025
Q3 		$24.8M Buy
1,724,279
+869,900
+102% +$10.3M 0.97% 31
2025
Q2 		$6.13M Buy
+854,379
New +$4.74M 0.32% 54

Other funds holding COGT

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
FFM
Fairmount Funds Management West Conshohocken, Pennsylvania $1.51B AUM 546.08% 1-Year Est. Return
DM
Deerfield Management New York $9.59B AUM 113.36% 1-Year Est. Return
TCM
TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Siren LLC's COGT Position: Q2 2026 in Review

Siren LLC increased its Cogent Biosciences (COGT) stake by 8.8% in Q2 2026, buying an estimated $5.25M and bringing the position to 1,859,279 shares worth $72M. The position accounts for 1.46% of the portfolio, ranked #21.

Siren LLC first reported a position in COGT in Q2 2025 and has held it in 5 quarters since. 323 funds tracked by Wall St. Rank hold COGT as of Q2 2026.

  • Siren LLC held 1,859,279 shares of Cogent Biosciences worth $72M as of Q2 2026.
  • Siren LLC bought 150,000 Cogent Biosciences shares in Q2 2026, an estimated $5.25M.
  • Cogent Biosciences made up 1.46% of Siren LLC's portfolio in Q2 2026, its #21 holding.
  • Siren LLC first reported a position in Cogent Biosciences in Q2 2025 and has held it in 5 quarters since.
  • 323 funds tracked by Wall St. Rank held Cogent Biosciences as of Q2 2026.

Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.