Millennium Management
SION

Millennium Management’s Sionna Therapeutics SION Stock Holding History

Millennium 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
Q1 		$5.64M Buy
140,641
+60,095
+75% +$2.29M ﹤0.01% 2799
2025
Q4 		$3.31M Sell
80,546
-133,539
-62% -$5.06M ﹤0.01% 3447
2025
Q3 		$6.3M Buy
214,085
+200,051
+1,425% +$4.35M ﹤0.01% 2895
2025
Q2 		$243K Sell
14,034
-165,038
-92% -$2.16M ﹤0.01% 5275
2025
Q1 		$1.87M Buy
+179,072
New +$2.93M ﹤0.01% 3843

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

Millennium Management's SION Position: Q1 2026 in Review

Millennium Management increased its Sionna Therapeutics (SION) stake by 75% in Q1 2026, buying an estimated $2.29M and bringing the position to 140,641 shares worth $5.64M. The position accounts for ﹤0.01% of the portfolio, ranked #2799.

Millennium Management first reported a position in SION in Q1 2025 and has held it in 5 quarters since. The position peaked at $6.3M in Q3 2025. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • Millennium Management held 140,641 shares of Sionna Therapeutics worth $5.64M as of Q1 2026.
  • Millennium Management bought 60,095 Sionna Therapeutics shares in Q1 2026, an estimated $2.29M.
  • Sionna Therapeutics made up ﹤0.01% of Millennium Management's portfolio in Q1 2026, its #2799 holding.
  • Millennium Management first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 5 quarters since.
  • Millennium Management's Sionna Therapeutics position peaked at $6.3M in Q3 2025.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

Based on Millennium Management's 13F filing for Q1 2026, filed 15 May 2026.