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Siren LLC’s Korro Bio KRRO Stock Holding History

Siren LLC’s Portfolio KRRO Stock Details KRRO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$4.58M Hold
347,718
– – 0.09% 89
2026
Q1 		$3.94M Hold
347,718
– – 0.11% 83
2025
Q4 		$2.79M Sell
347,718
-71,115
-17% -$1.66M 0.08% 93
2025
Q3 		$20.1M Hold
418,833
– – 0.78% 34
2025
Q2 		$5.23M Hold
418,833
– – 0.27% 64
2025
Q1 		$7.29M Hold
418,833
– – 0.41% 48
2024
Q4 		$15.9M Hold
418,833
– – 0.7% 36
2024
Q3 		$14M Buy
+418,833
New +$17.6M 0.7% 37

Other funds holding KRRO

LCM
Lynx1 Capital Management San Juan, Puerto Rico $866M AUM 231.68% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.59B AUM 234.06% 1-Year Est. Return
VA
VR Adviser New York $3.3B AUM 525.74% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $80.2B AUM 51.53% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
AAA
Affinity Asset Advisors New York $2.21B AUM 431.26% 1-Year Est. Return
NCM
Nantahala Capital Management New Canaan, Connecticut $3.01B AUM 119.46% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return

Siren LLC's KRRO Position: Q2 2026 in Review

Siren LLC held its Korro Bio (KRRO) position steady in Q2 2026 at 347,718 shares worth $4.58M. The position accounts for 0.09% of the portfolio, ranked #89.

Siren LLC first reported a position in KRRO in Q3 2024 and has held it in 8 quarters since. The position peaked at $20.1M in Q3 2025. 106 funds tracked by Wall St. Rank hold KRRO as of Q2 2026.

  • Siren LLC held 347,718 shares of Korro Bio worth $4.58M as of Q2 2026.
  • Siren LLC left its Korro Bio share count unchanged in Q2 2026.
  • Korro Bio made up 0.09% of Siren LLC's portfolio in Q2 2026, its #89 holding.
  • Siren LLC first reported a position in Korro Bio in Q3 2024 and has held it in 8 quarters since.
  • Siren LLC's Korro Bio position peaked at $20.1M in Q3 2025.
  • 106 funds tracked by Wall St. Rank held Korro Bio as of Q2 2026.

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