Mariner’s Dyne Therapeutics DYN Stock Holding History

Mariner’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	$292K	Buy	+16,089	New	+$277K	﹤0.01%	2908
2025 Q4	–	Sell	-19,541	Closed	-$247K	–	3609
2025 Q3	$247K	Buy	19,541 +7,588	+63%	+$86.5K	﹤0.01%	2984
2025 Q2	$114K	Sell	11,953 -13,699	-53%	-$151K	﹤0.01%	3216
2025 Q1	$268K	Buy	25,652 +14,495	+130%	+$207K	﹤0.01%	2732
2024 Q4	$263K	Sell	11,157 -1,667	-13%	-$49.3K	﹤0.01%	2751
2024 Q3	$461K	Buy	12,824 +1,855	+17%	+$73.8K	﹤0.01%	2199
2024 Q2	$387K	Buy	10,969 +1,224	+13%	+$35.6K	﹤0.01%	2254
2024 Q1	$277K	Buy	+9,745	New	+$220K	﹤0.01%	2509

Other funds holding DYN

T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

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 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 Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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

Mariner's DYN Position: Q1 2026 in Review

Mariner opened a new position in Dyne Therapeutics (DYN) in Q1 2026: 16,089 shares worth $292K. The stake represents ﹤0.01% of the portfolio and ranks #2908 among its holdings. This is a return to the name: Mariner previously reported a position in DYN as recently as Q3 2025.

Mariner first reported a position in DYN in Q1 2024 and has held it in 8 quarters since. The position peaked at $461K in Q3 2024. 227 funds tracked by Wall St. Rank hold DYN as of Q1 2026.

Mariner held 16,089 shares of Dyne Therapeutics worth $292K as of Q1 2026.
Dyne Therapeutics was a new Mariner position in Q1 2026.
Dyne Therapeutics made up ﹤0.01% of Mariner's portfolio in Q1 2026, its #2908 holding.
Mariner first reported a position in Dyne Therapeutics in Q1 2024 and has held it in 8 quarters since.
Mariner's Dyne Therapeutics position peaked at $461K in Q3 2024.
227 funds tracked by Wall St. Rank held Dyne Therapeutics as of Q1 2026.

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