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Rock Springs Capital Management’s Sionna Therapeutics SION Stock Holding History

Rock Springs Capital Management’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
Q2 		$4.37M Hold
99,429
– – 0.21% 74
2026
Q1 		$3.99M Hold
99,429
– – 0.23% 69
2025
Q4 		$4.09M Hold
99,429
– – 0.21% 79
2025
Q3 		$2.92M Hold
99,429
– – 0.17% 73
2025
Q2 		$1.73M Hold
99,429
– – 0.11% 78
2025
Q1 		$1.04M Buy
+99,429
New +$1.62M 0.06% 87

Other funds holding SION

RA Capital Management
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
TPG GP A
TPG GP A Fort Worth, Texas $5B AUM 58.56% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
OrbiMed
OrbiMed New York $5.4B AUM 163.13% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $345M AUM 134.64% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return

Rock Springs Capital Management's SION Position: Q2 2026 in Review

Rock Springs Capital Management held its Sionna Therapeutics (SION) position steady in Q2 2026 at 99,429 shares worth $4.37M. The position accounts for 0.21% of the portfolio, ranked #74.

Rock Springs Capital Management first reported a position in SION in Q1 2025 and has held it in 6 quarters since. 146 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Rock Springs Capital Management held 99,429 shares of Sionna Therapeutics worth $4.37M as of Q2 2026.
  • Rock Springs Capital Management left its Sionna Therapeutics share count unchanged in Q2 2026.
  • Sionna Therapeutics made up 0.21% of Rock Springs Capital Management's portfolio in Q2 2026, its #74 holding.
  • Rock Springs Capital Management first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 6 quarters since.
  • 146 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Rock Springs Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.