Driehaus Capital Management
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Driehaus Capital Management’s Sionna Therapeutics SION Stock Holding History

Driehaus Capital Management’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 		$17M Buy
385,447
+308,814
+403% +$12.4M 0.1% 243
2026
Q1 		$3.07M Sell
76,633
-7,217
-9% -$275K 0.02% 295
2025
Q4 		$3.45M Hold
83,850
– – 0.02% 318
2025
Q3 		$2.47M Hold
83,850
– – 0.02% 341
2025
Q2 		$1.45M Sell
83,850
-245,039
-75% -$3.21M 0.01% 347
2025
Q1 		$3.44M Buy
+328,889
New +$5.37M 0.03% 311

Other funds holding SION

RA Capital Management
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
TPG GP A
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
Atlas Venture Life Science Advisors
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
OrbiMed
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

Driehaus Capital Management's SION Position: Q2 2026 in Review

Driehaus Capital Management increased its Sionna Therapeutics (SION) stake by 403% in Q2 2026, buying an estimated $12.4M and bringing the position to 385,447 shares worth $17M. The position accounts for 0.1% of the portfolio, ranked #243.

Driehaus Capital Management 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.

  • Driehaus Capital Management held 385,447 shares of Sionna Therapeutics worth $17M as of Q2 2026.
  • Driehaus Capital Management bought 308,814 Sionna Therapeutics shares in Q2 2026, an estimated $12.4M.
  • Sionna Therapeutics made up 0.1% of Driehaus Capital Management's portfolio in Q2 2026, its #243 holding.
  • Driehaus Capital Management 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 Driehaus Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.