Alyeska Investment Group
SION

Alyeska Investment Group’s Sionna Therapeutics SION Stock Holding History

Alyeska Investment Group’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 		$5.99M Hold
136,222
– – 0.02% 488
2026
Q1 		$5.46M Hold
136,222
– – 0.02% 465
2025
Q4 		$5.6M Sell
136,222
-50,000
-27% -$1.9M 0.02% 446
2025
Q3 		$5.48M Hold
186,222
– – 0.02% 447
2025
Q2 		$3.23M Hold
186,222
– – 0.01% 458
2025
Q1 		$1.95M Buy
+186,222
New +$3.04M 0.01% 415

Other funds holding SION

RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
TGA
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
O
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

Alyeska Investment Group's SION Position: Q2 2026 in Review

Alyeska Investment Group held its Sionna Therapeutics (SION) position steady in Q2 2026 at 136,222 shares worth $5.99M. The position accounts for 0.02% of the portfolio, ranked #488.

Alyeska Investment Group 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.

  • Alyeska Investment Group held 136,222 shares of Sionna Therapeutics worth $5.99M as of Q2 2026.
  • Alyeska Investment Group left its Sionna Therapeutics share count unchanged in Q2 2026.
  • Sionna Therapeutics made up 0.02% of Alyeska Investment Group's portfolio in Q2 2026, its #488 holding.
  • Alyeska Investment Group 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 Alyeska Investment Group's 13F filing for Q2 2026, filed 14 Aug 2026.