Aberdeen Group
SION

Aberdeen Group’s Sionna Therapeutics SION Stock Holding History

Aberdeen 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 		$12.5M Sell
284,138
-280,037
-50% -$11.2M 0.02% 557
2026
Q1 		$22.6M Sell
564,175
-275,785
-33% -$10.5M 0.04% 394
2025
Q4 		$34.6M Sell
839,960
-110,587
-12% -$4.19M 0.05% 286
2025
Q3 		$28M Hold
950,547
– – 0.04% 331
2025
Q2 		$16.5M Buy
950,547
+204,583
+27% +$2.68M 0.03% 467
2025
Q1 		$7.8M Buy
+745,964
New +$12.2M 0.02% 622

Other funds holding SION

AA
ALPS Advisors Denver, Colorado $21.3B AUM 23.41% 1-Year Est. Return
New York State Common Retirement Fund
New York State Common Retirement Fund Albany, New York $79.3B AUM 43.63% 1-Year Est. Return
CUAMC
China Universal Asset Management Company Shanghai, China $1.67B AUM 89% 1-Year Est. Return
PFSRSONJ
Police & Firemen's Retirement System of New Jersey Trenton, New Jersey $13.3B AUM 45.46% 1-Year Est. Return
AA
AlphaCentric Advisors San Juan, Puerto Rico $118M AUM
SO
STRS Ohio Columbus, Ohio $26.7B AUM 43.32% 1-Year Est. Return
Mirae Asset Global Investments
Mirae Asset Global Investments Seoul, South Korea $67.7B AUM 51.91% 1-Year Est. Return
GI
GAMMA Investing Foster City, California $2.69B AUM 42.78% 1-Year Est. Return
FFA
Farther Finance Advisors San Francisco, California $12.8B AUM 26.53% 1-Year Est. Return
SCM
Sterling Capital Management Charlotte, North Carolina $5.9B AUM 29.63% 1-Year Est. Return

Aberdeen Group's SION Position: Q2 2026 in Review

Aberdeen Group reduced its Sionna Therapeutics (SION) stake by 50% in Q2 2026, selling an estimated $11.2M and leaving 284,138 shares worth $12.5M. The position accounts for 0.02% of the portfolio, ranked #557.

Aberdeen Group first reported a position in SION in Q1 2025 and has held it in 6 quarters since. The position peaked at $34.6M in Q4 2025. 17 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Aberdeen Group held 284,138 shares of Sionna Therapeutics worth $12.5M as of Q2 2026.
  • Aberdeen Group sold 280,037 Sionna Therapeutics shares in Q2 2026, an estimated $11.2M.
  • Sionna Therapeutics made up 0.02% of Aberdeen Group's portfolio in Q2 2026, its #557 holding.
  • Aberdeen Group first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 6 quarters since.
  • Aberdeen Group's Sionna Therapeutics position peaked at $34.6M in Q4 2025.
  • 17 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Aberdeen Group's 13F filing for Q2 2026, filed 31 Jul 2026.