Dyne Therapeutics, Inc.
DYN- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001818794
In the last 90 days, Dyne Therapeutics, Inc. insiders filed 1 open-market purchase and 8 sales; 247 institutions reported holding it in 13F filings for Q2 2026, worth $4.23B in total; no superinvestor holds it.
Holders of 5% or more of DYN
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Dyne Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 13G/A | 18.70%30.8M shares | +2.50 ppfrom 16.20% | Jan 8, 20263 filings | May 15, 2026 | SEC |
| Janus Henderson Group PLC | 13G/A | 7.30%12.0M shares | −1.00 ppfrom 8.30% | Nov 14, 20248 filings | Aug 13, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 7.00%11.5M shares | +1.20 ppfrom 5.80% | Oct 22, 20244 filings | Jul 28, 2026 | SEC |
| FMR LLC | 13G/A | 6.80%11.2M shares | +1.40 ppfrom 5.40% | Nov 12, 20245 filings | Aug 6, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
68 Schedule 13D and 13G filings on Dyne Therapeutics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 13, 20264:51 PM ET | Atlas Venture Fund XI, L.P.and 8 others | 13G/A | 2.40%4.48M shares | −1.60 ppfrom 4.00%Below 5% | Jun 30, 2026 | SEC |
| Aug 13, 202612:47 PM ET | Janus Henderson Group PLC | 13G/A | 7.30%12.0M shares | −1.00 ppfrom 8.30% | Jun 30, 2026 | SEC |
| Aug 6, 202610:20 AM ET | FMR LLCand 1 other | 13G/A | 6.80%11.2M shares | +1.40 ppfrom 5.40% | Jun 30, 2026 | SEC |
| Jul 28, 20264:44 PM ET | BlackRock, Inc. | 13G/A | 7.00%11.5M shares | +1.20 ppfrom 5.80% | Jun 30, 2026 | SEC |
| May 15, 202612:36 PM ET | Janus Henderson Group PLC | 13G/A | 8.30%13.6M shares | −0.20 ppfrom 8.50% | Mar 31, 2026 | SEC |
| May 15, 202610:06 AM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 18.70%30.8M shares | +2.50 ppfrom 16.20% | Mar 31, 2026 | SEC |
| May 6, 202611:13 AM ET | FMR LLCand 1 other | 13G | 5.40%8.91M shares | +0.80 ppfrom 4.60% | Mar 31, 2026 | SEC |
| Mar 26, 20266:04 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Mar 6, 202612:57 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 16.20%26.6M shares | +5.50 ppfrom 10.70% | Feb 28, 2026 | SEC |
| Feb 17, 20264:34 PM ET | Janus Henderson Group PLC | 13G/A | 8.50%13.9M shares | −1.90 ppfrom 10.40% | Dec 31, 2025 | SEC |
| Jan 8, 202612:15 PM ET | T. Rowe Price Investment Management, Inc. | 13G | 10.70%17.5M shares | New | Dec 31, 2025 | SEC |
| Nov 14, 20254:14 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 0.00%0 shares | −8.50 ppfrom 8.50%Below 5% | Sep 30, 2025 | SEC |
| Nov 14, 202511:58 AM ET | Janus Henderson Group PLC | 13G/A | 10.40%14.7M shares | +0.30 ppfrom 10.10% | Sep 30, 2025 | SEC |
| Nov 13, 20254:23 PM ET | Atlas Venture Fund XI, L.P.and 8 others | 13G/A | 4.00%5.71M shares | –Below 5% | Sep 30, 2025 | SEC |
| Aug 7, 202510:34 AM ET | Janus Henderson Group PLC | 13G/A | 10.10%14.4M shares | +0.90 ppfrom 9.20% | Jul 31, 2025 | SEC |
| May 15, 20254:56 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 8.50%9.71M shares | – | Mar 31, 2025 | SEC |
| May 15, 20253:54 PM ET | Point72 Asset Management, L.P.and 2 others | 13G/A | 1.50%1.67M shares | −3.60 ppfrom 5.10%Below 5% | Mar 31, 2025 | SEC |
| May 15, 20258:46 AM ET | Forbion Capital Fund IV Cooperatief U.A.and 4 others | 13G/A | 4.80%5.40M shares | –Below 5% | Mar 31, 2025 | SEC |
| May 15, 20258:17 AM ET | RTW Investments, LPand 1 other | 13G/A | 1.50%1.69M shares | −3.60 ppfrom 5.10%Below 5% | Mar 31, 2025 | SEC |
| May 14, 202512:16 PM ET | Janus Henderson Group PLC | 13G/A | 9.20%10.4M shares | +1.90 ppfrom 7.30% | Mar 31, 2025 | SEC |
| May 12, 202510:32 AM ET | FMR LLCand 1 other | 13G/A | 4.60%5.20M shares | −3.30 ppfrom 7.90%Below 5% | Mar 31, 2025 | SEC |
| Apr 17, 20259:35 AM ET | BlackRock, Inc. | 13G/A | 5.80%6.58M shares | – | Mar 31, 2025 | SEC |
| Feb 14, 202512:22 PM ET | Janus Henderson Group PLC | 13G/A | 7.30%7.38M shares | – | Dec 31, 2024 | SEC |
| Feb 14, 20259:00 AM ET | RTW Investments, LPand 1 other | 13G/A | 5.10%5.22M shares | – | Dec 31, 2024 | SEC |
| Feb 12, 20259:28 AM ET | FMR LLCand 1 other | 13G/A | 7.90%8.00M shares | – | Dec 31, 2024 | SEC |
| Feb 3, 20255:07 PM ET | Point72 Asset Management, L.P.and 2 others | 13G | 5.10%5.20M shares | New | Jan 31, 2025 | SEC |
| Nov 14, 2024 | Janus Henderson Group PLC | 13GOld format | – | New | – | SEC |
| Nov 14, 2024 | Forbion Capital Fund IV Cooperatief U.A. | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Deep Track Capital, LP | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Ra Capital Management, L.P. | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Atlas Venture Fund XI, L.P. | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Citadel Advisors LLC | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | RTW Investments, LP | 13GOld format | – | New | – | SEC |
| Nov 12, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Nov 12, 2024 | FMR LLC | 13GOld format | – | New | – | SEC |
| Nov 8, 2024 | BlackRock, Inc. | 13G/AOld format | – | – | – | SEC |
| Nov 4, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Oct 22, 2024 | BlackRock, Inc. | 13G/AOld format | – | – | – | SEC |
| Apr 4, 2024 | Ra Capital Management, L.P. | 13GOld format | – | – | – | SEC |
| Feb 14, 2024 | Deep Track Capital, LP | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Citadel Advisors LLC | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2024 | MPM Bioventures 2018, L.P. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | Atlas Venture Fund XI, L.P. | 13G/AOld format | – | – | – | SEC |
| Jan 29, 20243:26 PM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Jan 19, 2024 | Deep Track Capital, LP | 13GOld format | – | – | – | SEC |
| Jan 19, 2024 | Deep Track Capital, LP | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Atlas Venture Fund XI, L.P. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Deep Track Capital, LP | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Citadel Advisors LLC | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Logos Global Management LP | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
207 notices from officers, directors and other affiliates planning to sell Dyne Therapeutics, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Sep 8, 20264:39 PM ET | Cox JohnOfficer | 5.66K | $106.8K | Sep 8, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Sep 8, 20264:38 PM ET | Kerr DouglasOfficer | 35 | $661 | Sep 8, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Sep 4, 20264:02 PM ET | Kerr DouglasOfficer | 5.00K | $121.7K | Sep 4, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Aug 14, 20265:47 PM ET | Atlas Venture Opportunity Fund I, LPShareholder | 322.5K | $8.37M | Aug 14, 202610b5-1 | Merrill Lynch | SEC |
| Aug 14, 20265:47 PM ET | Atlas Venture Fund XI, LPShareholder | 1.36M | $35.3M | Aug 14, 202610b5-1 | Merrill Lynch | SEC |
| Aug 14, 20265:46 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 478.4K | $12.4M | Aug 14, 202610b5-1 | Merrill Lynch | SEC |
| Aug 13, 20265:36 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 94.4K | $2.47M | Aug 13, 202610b5-1 | Merrill Lynch | SEC |
| Aug 13, 20265:36 PM ET | Atlas Venture Fund XI, LPShareholder | 268.4K | $7.02M | Aug 13, 202610b5-1 | Merrill Lynch | SEC |
| Aug 13, 20265:36 PM ET | Atlas Venture Opportunity Fund I, LPShareholder | 63.6K | $1.67M | Aug 13, 202610b5-1 | Merrill Lynch | SEC |
| Aug 13, 20265:04 PM ET | Cox JohnOfficer | 4.99K | $131.0K | Aug 13, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Aug 13, 20265:03 PM ET | Lucera ErickOfficer | 1.80K | $47.2K | Aug 13, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Aug 13, 20265:03 PM ET | Kerr DouglasOfficer | 2.44K | $64.2K | Aug 13, 2026 | Stifel Nicolaus & Company Inc | SEC |
| Jul 27, 20264:19 PM ET | ForDyne B.V.Affiliate | 261.5K | $6.67M | Jul 27, 202610b5-1 | UBS Financial Services Inc. | SEC |
| Jul 7, 20265:06 PM ET | Atlas Venture Associates XI, L.P.Shareholder | 5.00K | $114.2K | Jul 7, 2026 | Merrill Lynch | SEC |
| Jul 7, 20265:06 PM ET | Atlas Venture Opportunity Fund I, LPShareholder | 60.9K | $1.39M | Jul 7, 202610b5-1 | Merrill Lynch | SEC |
| Jul 7, 20265:05 PM ET | Atlas Venture Fund XI, LPShareholder | 154.0K | $3.52M | Jul 7, 202610b5-1 | Merrill Lynch | SEC |
| Jul 7, 20265:05 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 77.4K | $1.77M | Jul 7, 202610b5-1 | Merrill Lynch | SEC |
| Jul 6, 20265:17 PM ET | Atlas Venture Opportunity Fund I, LPShareholder | 100.0K | $2.31M | Jul 6, 202610b5-1 | Merrill Lynch | SEC |
| Jul 6, 20265:17 PM ET | Atlas Venture Fund XI, LPShareholder | 253.0K | $5.84M | Jul 6, 202610b5-1 | Merrill Lynch | SEC |
| Jul 6, 20265:17 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 127.2K | $2.93M | Jul 6, 202610b5-1 | Merrill Lynch | SEC |
| Jun 29, 20265:50 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 51.8K | $1.08M | Jun 29, 202610b5-1 | Merrill Lynch | SEC |
| Jun 29, 20265:50 PM ET | Atlas Venture Fund XI, LPShareholder | 103.0K | $2.16M | Jun 29, 202610b5-1 | Merrill Lynch | SEC |
| Jun 29, 20265:49 PM ET | Atlas Venture Opportunity Fund I, LPShareholder | 40.7K | $852.3K | Jun 29, 202610b5-1 | Merrill Lynch | SEC |
| Jun 26, 20265:04 PM ET | Atlas Venture Opportunity Fund II, LPShareholder | 81.9K | $1.69M | Jun 26, 202610b5-1 | Merrill Lynch | SEC |
| Jun 26, 20265:04 PM ET | Atlas Venture Fund XI, LPShareholder | 163.0K | $3.36M | Jun 26, 202610b5-1 | Merrill Lynch | SEC |
Showing the latest 25. See the DYN notices from the last 12 months