California State Teachers Retirement System (CalSTRS)
SION

California State Teachers Retirement System (CalSTRS)’s Sionna Therapeutics SION Stock Holding History

California State Teachers Retirement System (CalSTRS)’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
Q1 		$34.8K Sell
868
-120
-12% -$4.58K ﹤0.01% 2288
2025
Q4 		$40.6K Buy
988
+217
+28% +$8.23K ﹤0.01% 2323
2025
Q3 		$22.7K Buy
771
+1
+0.1% +$22 ﹤0.01% 2514
2025
Q2 		$13.4K Buy
+770
New +$10.1K ﹤0.01% 2633

Other funds holding SION

RCM
RA Capital Management Boston, Massachusetts $9.44B AUM 157.3% 1-Year Est. Return
TGA
TPG GP A Fort Worth, Texas $3.68B AUM 14.99% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

California State Teachers Retirement System (CalSTRS)'s SION Position: Q1 2026 in Review

California State Teachers Retirement System (CalSTRS) reduced its Sionna Therapeutics (SION) stake by 12% in Q1 2026, selling an estimated $4.58K and leaving 868 shares worth $34.8K. The position accounts for ﹤0.01% of the portfolio, ranked #2288.

California State Teachers Retirement System (CalSTRS) first reported a position in SION in Q2 2025 and has held it in 4 quarters since. The position peaked at $40.6K in Q4 2025. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • California State Teachers Retirement System (CalSTRS) held 868 shares of Sionna Therapeutics worth $34.8K as of Q1 2026.
  • California State Teachers Retirement System (CalSTRS) sold 120 Sionna Therapeutics shares in Q1 2026, an estimated $4.58K.
  • Sionna Therapeutics made up ﹤0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q1 2026, its #2288 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Sionna Therapeutics in Q2 2025 and has held it in 4 quarters since.
  • California State Teachers Retirement System (CalSTRS)'s Sionna Therapeutics position peaked at $40.6K in Q4 2025.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q1 2026, filed 18 May 2026.