Dyne Therapeutics, Inc.
US ˙ NasdaqGS ˙ US26818M1080

SecurityDYN / Dyne Therapeutics, Inc.
InstitutionQuest Partners LLC
Latest Disclosed Ownership15,963 shares
Latest Disclosed Value $ 312,236
Quest Partners LLC reports 8.95% increase in ownership of DYN / Dyne Therapeutics, Inc.

On February 9, 2026 - Quest Partners LLC filed a 13F-HR form disclosing ownership of 15,963 shares of Dyne Therapeutics, Inc. (US:DYN) valued at $312,236 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 3, 2025 disclosing 14,652 shares of Dyne Therapeutics, Inc.. This represents a change in shares of 8.95% during the quarter. The current value of the position is $293,879 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-09 2025-12-31 13F DYNE THERAPEUTICS COM 26818M108 15,963 1,311 8.95 312 68.65 0.0175
2025-11-03 2025-09-30 13F DYNE THERAPEUTICS COM 26818M108 14,652 -3,665 -20.01 185 6.32 0.0121
2025-07-31 2025-06-30 13F DYNE THERAPEUTICS COM 26818M108 18,317 1,985 12.15 174 2.35 0.0171
2025-05-14 2025-03-31 13F DYNE THERAPEUTICS COM 26818M108 16,332 16,332 171 0.0186
2025-02-07 2024-12-31 13F DYNE THERAPEUTICS COM 26818M108 0 -3,434 -100.00 0 -100.00
2024-11-07 2024-09-30 13F DYNE THERAPEUTICS COM 26818M108 3,434 3,090 898.26 123 925.00 0.0110
2024-08-06 2024-06-30 13F DYNE THERAPEUTICS COM 26818M108 344 179 108.48 12 200.00 0.0016
2024-05-09 2024-03-31 13F DYNE THERAPEUTICS COM 26818M108 165 -1,217 -88.06 5 -77.78 0.0008
2024-02-09 2023-12-31 13F DYNE THERAPEUTICS COM 26818M108 1,382 1,382 18 0.0039
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.