Who owns Dyne Therapeutics (DYN)
Which tracked institutional funds hold DYN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See DYN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on DYN is one-sided between 2026-Q1 and 2026-Q2: 99 added or opened and 30 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
DYN’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes DYN more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in DYN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 235 tracked filers holding DYN, 131 increased or opened the position and 110 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in DYN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 13
- Jupiter Topco LLC$267M
- NOVO HOLDINGS A/S$21M
- Granahan Investment Management, LLC$8M
- Alyeska Investment Group, L.P.$5M
- ALPS ADVISORS INC$4M
- AXXCESS WEALTH MANAGEMENT, LLC$3M
Full exits 12
- T. Rowe Price Investment Management, Inc.$558M
- JANUS HENDERSON GROUP PLC$247M
- STEMPOINT CAPITAL LP$9M
- Qube Research & Technologies Ltd$5M
- PDT Partners, LLC$3M
- Burkehill Global Management, LP$3M
Largest adds
- FMR LLC$87M
- BlackRock, Inc.$63M
- PRICE T ROWE ASSOCIATES INC /MD/$45M
- STATE STREET CORP$45M
- Orbis Allan Gray Ltd$33M
- MARSHALL WACE, LLP$32M
Largest trims
- PERCEPTIVE ADVISORS LLC$25M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$15M
- Atlas Venture Life Science Advisors, LLC$15M
- BRAIDWELL LP$10M
- Squarepoint Ops LLC$8M
- Fiera Capital Corp$7M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 12,404,330 | $276M | 7.9% | 2026-Q2 |
| Jupiter Topco LLC new | 11,997,738 | $267M | 7.6% | 2026-Q2 |
| FMR LLC added | 11,207,000 | $249M | 7.1% | 2026-Q2 |
| STATE STREET CORP added | 7,458,263 | $166M | 4.8% | 2026-Q2 |
| Orbis Allan Gray Ltd added | 7,006,542 | $156M | 4.5% | 2026-Q2 |
| Atlas Venture Life Science Advisors, LLC trimmed | 6,800,099 | $151M | 4.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 6,310,969 | $140M | 4.0% | 2026-Q2 |
| TCG Crossover Management, LLC | 4,615,144 | $103M | 2.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 4,048,428 | $90M | 2.6% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 3,936,806 | $87M | 2.5% | 2026-Q2 |
| FCPM III SERVICES B.V. trimmed | 3,848,256 | $85M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,743,427 | $83M | 2.4% | 2026-Q2 |
| Vestal Point Capital, LP trimmed | 3,375,000 | $75M | 2.2% | 2026-Q2 |
| ORBIMED ADVISORS LLC added | 3,235,684 | $72M | 2.1% | 2026-Q2 |
| Frazier Life Sciences Management, L.P. | 3,153,082 | $70M | 2.0% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 3,151,656 | $67M | 1.9% | 2026-Q2 |
| ARMISTICE CAPITAL, LLC trimmed | 3,087,226 | $69M | 2.0% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC trimmed | 2,689,235 | $60M | 1.7% | 2026-Q2 |
| Logos Global Management LP added | 2,550,000 | $57M | 1.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 2,233,398 | $50M | 1.4% | 2026-Q2 |
| Venrock Adviser, LLC | 2,173,913 | $48M | 1.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,157,195 | $48M | 1.4% | 2026-Q2 |
| Siren, L.L.C. trimmed | 2,129,125 | $47M | 1.4% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 2,030,819 | $45M | 1.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,946,479 | $43M | 1.2% | 2026-Q2 |
| MPM BIOIMPACT LLC added | 1,922,093 | $43M | 1.2% | 2026-Q2 |
| SAMLYN CAPITAL, LLC trimmed | 1,754,708 | $39M | 1.1% | 2026-Q2 |
| Sofinnova Investments, Inc. added | 1,658,384 | $37M | 1.1% | 2026-Q2 |
| Palo Alto Investors LP trimmed | 1,647,521 | $37M | 1.0% | 2026-Q2 |
| Vivo Capital, LLC | 1,557,466 | $35M | 1.0% | 2026-Q2 |
| Aberdeen Group plc added | 1,539,434 | $34M | 1.0% | 2026-Q2 |
| Deep Track Capital, LP trimmed | 1,500,000 | $33M | 1.0% | 2026-Q2 |
| MARSHALL WACE, LLP added | 1,488,917 | $33M | 0.9% | 2026-Q2 |
| Polar Capital Holdings Plc trimmed | 1,286,811 | $29M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,278,081 | $28M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,202,203 | $27M | 0.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,143,958 | $25M | 0.7% | 2026-Q2 |
| Saturn V Capital Management LP added | 1,057,493 | $23M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 988,949 | $22M | 0.6% | 2026-Q2 |
| NOVO HOLDINGS A/S new | 960,394 | $21M | 0.6% | 2026-Q2 |
| Rock Springs Capital Management LP trimmed | 942,154 | $21M | 0.6% | 2026-Q2 |
| BRAIDWELL LP trimmed | 921,598 | $20M | 0.6% | 2026-Q2 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 874,138 | $19M | 0.6% | 2026-Q2 |
| BAKER BROS. ADVISORS LP | 813,449 | $18M | 0.5% | 2026-Q2 |
| Fiera Capital Corp trimmed | 789,989 | $18M | 0.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 746,200 | $17M | 0.5% | 2026-Q2 |
| Artisan Partners Limited Partnership added | 659,786 | $15M | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 576,350 | $13M | 0.4% | 2026-Q2 |
| TD Asset Management Inc added | 548,112 | $12M | 0.3% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 506,273 | $11M | 0.3% | 2026-Q2 |
| WASATCH ADVISORS LP | 443,668 | $10M | 0.3% | 2026-Q2 |
| UBS Group AG added | 443,284 | $10M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 431,850 | $10M | 0.3% | 2026-Q2 |
| Clearbridge Investments, LLC added | 415,131 | $9M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 409,801 | $9M | 0.3% | 2026-Q2 |
| ArrowMark Colorado Holdings LLC trimmed | 397,221 | $9M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 386,787 | $9M | 0.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 360,572 | $8M | 0.2% | 2026-Q2 |
| Tetragon Partners GP Ltd added | 356,657 | $8M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 355,953 | $8M | 0.2% | 2026-Q2 |
| Granahan Investment Management, LLC new | 338,565 | $8M | 0.2% | 2026-Q2 |
| University of Wisconsin Foundation trimmed | 313,559 | $7M | 0.2% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 305,794 | $7M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 300,074 | $7M | 0.2% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 298,505 | $7M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 298,317 | $7M | 0.2% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 289,730 | $6M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 269,985 | $6M | 0.2% | 2026-Q2 |
| Alyeska Investment Group, L.P. new | 245,278 | $5M | 0.2% | 2026-Q2 |
| Catalio Capital Management, LP trimmed | 244,929 | $5M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 242,392 | $5M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 232,000 | $5M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 220,664 | $5M | 0.1% | 2026-Q2 |
| SPHERA FUNDS MANAGEMENT LTD. added | 199,594 | $4M | 0.1% | 2026-Q2 |
| SummitTX Capital, L.P. trimmed | 194,643 | $4M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 187,915 | $4M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 183,799 | $4M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 174,457 | $4M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 172,080 | $3M | 0.1% | 2026-Q2 |
| HighVista Strategies LLC trimmed | 171,961 | $4M | 0.1% | 2026-Q2 |
| ALPS ADVISORS INC new | 167,082 | $4M | 0.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 164,598 | $4M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 157,916 | $4M | 0.1% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 156,203 | $3M | 0.1% | 2026-Q2 |
| AXXCESS WEALTH MANAGEMENT, LLC added | 155,270 | $3M | 0.1% | 2026-Q2 |
| Darwin Wealth Management, LLC added | 155,270 | $3M | 0.1% | 2026-Q2 |
| Aegis Wealth Management LLC added | 150,030 | $3M | 0.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 150,000 | $3M | 0.1% | 2026-Q2 |
| Woodline Partners LP | 149,388 | $3M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 135,147 | $3M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 134,752 | $3M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 125,786 | $3M | 0.1% | 2026-Q2 |
| Jain Global LLC trimmed | 116,341 | $3M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 115,102 | $3M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 105,553 | $2M | 0.1% | 2026-Q2 |
| Legal & General Group Plc added | 97,940 | $2M | 0.1% | 2026-Q2 |
| FIDEURAM - INTESA SANPAOLO PRIVATE BANKING S.P.A. added | 87,069 | $2M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 84,054 | $2M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 81,238 | $2M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 79,775 | $2M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.