Jennison Associates
SION

Jennison Associates’s Sionna Therapeutics SION Stock Holding History

Jennison Associates’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 		$51.6M Sell
1,172,133
-279,087
-19% -$11.2M 0.03% 232
2026
Q1 		$58.2M Buy
1,451,220
+335,942
+30% +$12.8M 0.04% 200
2025
Q4 		$45.9M Buy
1,115,278
+117,903
+12% +$4.47M 0.03% 220
2025
Q3 		$29.3M Buy
997,375
+244,575
+32% +$5.32M 0.02% 291
2025
Q2 		$13.1M Sell
752,800
-107,127
-12% -$1.4M 0.01% 363
2025
Q1 		$8.99M Buy
+859,927
New +$14.1M 0.01% 387

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
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

Jennison Associates's SION Position: Q2 2026 in Review

Jennison Associates reduced its Sionna Therapeutics (SION) stake by 19% in Q2 2026, selling an estimated $11.2M and leaving 1,172,133 shares worth $51.6M. The position accounts for 0.03% of the portfolio, ranked #232.

Jennison Associates first reported a position in SION in Q1 2025 and has held it in 6 quarters since. The position peaked at $58.2M in Q1 2026. 146 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Jennison Associates held 1,172,133 shares of Sionna Therapeutics worth $51.6M as of Q2 2026.
  • Jennison Associates sold 279,087 Sionna Therapeutics shares in Q2 2026, an estimated $11.2M.
  • Sionna Therapeutics made up 0.03% of Jennison Associates's portfolio in Q2 2026, its #232 holding.
  • Jennison Associates first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 6 quarters since.
  • Jennison Associates's Sionna Therapeutics position peaked at $58.2M in Q1 2026.
  • 146 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Jennison Associates's 13F filing for Q2 2026, filed 3 Aug 2026.