SL
SION

Siren LLC’s Sionna Therapeutics SION Stock Holding History

Siren LLC’s Portfolio SION Stock Details SION Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$12M Hold
300,000
– – 0.33% 55
2025
Q4 		$12.3M Sell
300,000
-25,000
-8% -$948K 0.37% 47
2025
Q3 		$9.56M Hold
325,000
– – 0.37% 48
2025
Q2 		$5.64M Hold
325,000
– – 0.29% 58
2025
Q1 		$3.4M Buy
+325,000
New +$5.31M 0.19% 73

Other funds holding SION

RCM
RA Capital Management Boston, Massachusetts $9.44B AUM 157.3% 1-Year Est. Return
TGA
TPG GP A Fort Worth, Texas $3.68B AUM 14.99% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 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
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Siren LLC's SION Position: Q1 2026 in Review

Siren LLC held its Sionna Therapeutics (SION) position steady in Q1 2026 at 300,000 shares worth $12M. The position accounts for 0.33% of the portfolio, ranked #55.

Siren LLC first reported a position in SION in Q1 2025 and has held it in 5 quarters since. The position peaked at $12.3M in Q4 2025. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • Siren LLC held 300,000 shares of Sionna Therapeutics worth $12M as of Q1 2026.
  • Siren LLC left its Sionna Therapeutics share count unchanged in Q1 2026.
  • Sionna Therapeutics made up 0.33% of Siren LLC's portfolio in Q1 2026, its #55 holding.
  • Siren LLC first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 5 quarters since.
  • Siren LLC's Sionna Therapeutics position peaked at $12.3M in Q4 2025.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

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