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
Q2 		$978K Sell
44,054
-919
-2% -$17.1K ﹤0.01% 2306
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 $153B AUM 38.14% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
OAG
Orbis Allan Gray Hamilton, Bermuda $29.1B AUM 60.8% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
TCM
TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

SEI Investments's DYN Position: Q2 2026 in Review

SEI Investments reduced its Dyne Therapeutics (DYN) stake by 2% in Q2 2026, selling an estimated $17.1K and leaving 44,054 shares worth $978K. The position accounts for ﹤0.01% of the portfolio, ranked #2306.

SEI Investments first reported a position in DYN in Q1 2024 and has held it in 5 quarters since. The position peaked at $1.15M in Q4 2025. 245 funds tracked by Wall St. Rank hold DYN as of Q2 2026.

  • SEI Investments held 44,054 shares of Dyne Therapeutics worth $978K as of Q2 2026.
  • SEI Investments sold 919 Dyne Therapeutics shares in Q2 2026, an estimated $17.1K.
  • Dyne Therapeutics made up ﹤0.01% of SEI Investments's portfolio in Q2 2026, its #2306 holding.
  • SEI Investments first reported a position in Dyne Therapeutics in Q1 2024 and has held it in 5 quarters since.
  • SEI Investments's Dyne Therapeutics position peaked at $1.15M in Q4 2025.
  • 245 funds tracked by Wall St. Rank held Dyne Therapeutics as of Q2 2026.

Based on SEI Investments's 13F filing for Q2 2026, filed 14 Aug 2026.