SEI Investments
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SEI Investments’s Dyne Therapeutics DYN Stock Holding History

SEI Investments’s Portfolio DYN Stock Details DYN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$815K Sell
44,973
-13,782
-23% -$238K ﹤0.01% 2450
2025
Q4 		$1.15M Buy
+58,755
New +$1.11M ﹤0.01% 2123
2024
Q3 		– Sell
-18,092
Closed -$638K – 2708
2024
Q2 		$638K Sell
18,092
-6,318
-26% -$184K ﹤0.01% 2073
2024
Q1 		$693K Buy
+24,410
New +$552K ﹤0.01% 2005

Other funds holding DYN

T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
OAG
Orbis Allan Gray Hamilton, Bermuda $23.7B AUM 65.43% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
PA
Perceptive Advisors New York $5.12B AUM 314.02% 1-Year Est. Return
FIS
FCPM III Services Naarden, Netherlands $722M AUM 73.61% 1-Year Est. Return

SEI Investments's DYN Position: Q1 2026 in Review

SEI Investments reduced its Dyne Therapeutics (DYN) stake by 23% in Q1 2026, selling an estimated $238K and leaving 44,973 shares worth $815K. The position accounts for ﹤0.01% of the portfolio, ranked #2450.

SEI Investments first reported a position in DYN in Q1 2024 and has held it in 4 quarters since. The position peaked at $1.15M in Q4 2025. 227 funds tracked by Wall St. Rank hold DYN as of Q1 2026.

  • SEI Investments held 44,973 shares of Dyne Therapeutics worth $815K as of Q1 2026.
  • SEI Investments sold 13,782 Dyne Therapeutics shares in Q1 2026, an estimated $238K.
  • Dyne Therapeutics made up ﹤0.01% of SEI Investments's portfolio in Q1 2026, its #2450 holding.
  • SEI Investments first reported a position in Dyne Therapeutics in Q1 2024 and has held it in 4 quarters since.
  • SEI Investments's Dyne Therapeutics position peaked at $1.15M in Q4 2025.
  • 227 funds tracked by Wall St. Rank held Dyne Therapeutics as of Q1 2026.

Based on SEI Investments's 13F filing for Q1 2026, filed 13 May 2026.