Morgan Stanley
SION icon

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
Q3 		$1.6M Buy
303,883
+152,836
+101% +$3.51M ﹤0.01% 5042
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

Atlas Venture Life Science Advisors
Atlas Venture Life Science Advisors Cambridge, Massachusetts $631M AUM 38.42% 1-Year Est. Return
BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Aberdeen Group
Aberdeen Group Edinburgh, United Kingdom $72.4B AUM 31.32% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Y-Intercept (HK)
Y-Intercept (HK) Hong Kong $4.52B AUM 6.6% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $85.7B AUM 51.02% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Walleye Capital
Walleye Capital New York $109B AUM 29.28% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $114B AUM 35.47% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return

Morgan Stanley's SION Position: Q3 2026 in Review

Morgan Stanley increased its Sionna Therapeutics (SION) stake by 101% in Q3 2026, buying an estimated $3.51M and bringing the position to 303,883 shares worth $1.6M. The position accounts for ﹤0.01% of the portfolio, ranked #5042.

Morgan Stanley first reported a position in SION in Q1 2025 and has held it in 7 quarters since. The position peaked at $6.64M in Q2 2026. 87 funds tracked by Wall St. Rank hold SION as of Q3 2026.

  • Morgan Stanley held 303,883 shares of Sionna Therapeutics worth $1.6M as of Q3 2026.
  • Morgan Stanley bought 152,836 Sionna Therapeutics shares in Q3 2026, an estimated $3.51M.
  • Sionna Therapeutics made up ﹤0.01% of Morgan Stanley's portfolio in Q3 2026, its #5042 holding.
  • Morgan Stanley first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 7 quarters since.
  • Morgan Stanley's Sionna Therapeutics position peaked at $6.64M in Q2 2026.
  • 87 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q3 2026.

Based on Morgan Stanley's 13F filing for Q3 2026, filed 13 Nov 2026.