Wellington Management Group
SION

Wellington Management Group’s Sionna Therapeutics SION Stock Holding History

Wellington Management 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 		$1.64M Sell
37,365
-8,714
-19% -$349K ﹤0.01% 1668
2026
Q1 		$1.85M Buy
46,079
+7,732
+20% +$295K ﹤0.01% 1567
2025
Q4 		$1.58M Sell
38,347
-3,887
-9% -$147K ﹤0.01% 1646
2025
Q3 		$1.24M Buy
+42,234
New +$919K ﹤0.01% 1734

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

Wellington Management Group's SION Position: Q2 2026 in Review

Wellington Management Group reduced its Sionna Therapeutics (SION) stake by 19% in Q2 2026, selling an estimated $349K and leaving 37,365 shares worth $1.64M. The position accounts for ﹤0.01% of the portfolio, ranked #1668.

Wellington Management Group first reported a position in SION in Q3 2025 and has held it in 4 quarters since. The position peaked at $1.85M in Q1 2026. 147 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Wellington Management Group held 37,365 shares of Sionna Therapeutics worth $1.64M as of Q2 2026.
  • Wellington Management Group sold 8,714 Sionna Therapeutics shares in Q2 2026, an estimated $349K.
  • Sionna Therapeutics made up ﹤0.01% of Wellington Management Group's portfolio in Q2 2026, its #1668 holding.
  • Wellington Management Group first reported a position in Sionna Therapeutics in Q3 2025 and has held it in 4 quarters since.
  • Wellington Management Group's Sionna Therapeutics position peaked at $1.85M in Q1 2026.
  • 147 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Wellington Management Group's 13F filing for Q2 2026, filed 14 Aug 2026.