Morgan Stanley
SION

Morgan Stanley’s Sionna Therapeutics SION Stock Holding History

Morgan Stanley’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 		$6.64M Buy
151,047
+18,024
+14% +$721K ﹤0.01% 4035
2026
Q1 		$5.33M Buy
133,023
+83,147
+167% +$3.17M ﹤0.01% 4087
2025
Q4 		$2.05M Buy
49,876
+27,039
+118% +$1.03M ﹤0.01% 4793
2025
Q3 		$672K Sell
22,837
-21,181
-48% -$461K ﹤0.01% 5368
2025
Q2 		$764K Buy
44,018
+40,079
+1,017% +$525K ﹤0.01% 5244
2025
Q1 		$41.2K Buy
+3,939
New +$64.4K ﹤0.01% 6336

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

Morgan Stanley's SION Position: Q2 2026 in Review

Morgan Stanley increased its Sionna Therapeutics (SION) stake by 14% in Q2 2026, buying an estimated $721K and bringing the position to 151,047 shares worth $6.64M. The position accounts for ﹤0.01% of the portfolio, ranked #4035.

Morgan Stanley 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.

  • Morgan Stanley held 151,047 shares of Sionna Therapeutics worth $6.64M as of Q2 2026.
  • Morgan Stanley bought 18,024 Sionna Therapeutics shares in Q2 2026, an estimated $721K.
  • Sionna Therapeutics made up ﹤0.01% of Morgan Stanley's portfolio in Q2 2026, its #4035 holding.
  • Morgan Stanley 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 Morgan Stanley's 13F filing for Q2 2026, filed 13 Aug 2026.