Dyne Therapeutics, Inc. (DYN) has 20 known insider and institutional holders on record. The largest holder is ECP ControlCo, LLC with 14,291,152 shares. Other notable holders include FRANKLIN RESOURCES INC and Kersten Dirk.
Over the last 12 months, insiders have made 40 transactions in DYN stock — 19 buys (valued at $18.34M) and 18 sells (valued at $11.68M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
DYN Insider Ownership
Top Holder
ECP ControlCo, LLC
14,291,152 shares
Buys (12 mo)
19
$18.34M value
Sells (12 mo)
18
$11.68M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Ecp Controlco, Llc |
10 Percent Owner |
14,291,152 |
2018-01-11 |
|
| 2 |
Franklin Resources Inc |
10 Percent Owner |
8,927,023 |
2015-06-03 |
|
| 3 |
Kersten Dirk |
Director |
4,644,386 |
2026-03-13 |
|
| 4 |
Atlas Venture Opportunity Fund Ii, L.p. |
Director |
934,581 |
2022-12-14 |
|
| 5 |
Atlas Venture Fund Xi, L.p. |
10 Percent Owner |
903,527 |
2024-02-28 |
|
| 6 |
Atlas Venture Opportunity Fund I, L.p. |
10 Percent Owner |
847,388 |
2024-03-05 |
|
| 7 |
Flexon Robert C |
President and CEO |
497,281 |
2018-03-12 |
|
| 8 |
Cox John |
CEO & President |
374,145 |
2026-03-06 |
|
| 9 |
Beskrovnaya Oxana |
Chief Scientific Officer |
195,840 |
2025-03-13 |
|
| 10 |
Kerr Douglas |
Chief Medical Officer |
171,606 |
2026-03-06 |
|
| 11 |
Friedl-naderer Johanna |
Chief Commercial Officer |
154,581 |
2026-03-06 |
|
| 12 |
Farwell Wildon |
Chief Medical Officer |
143,222 |
2024-08-20 |
|
| 13 |
Mcneill Jonathan |
Chief Business Officer |
132,106 |
2024-08-20 |
|
| 14 |
High Susanna Gatti |
Chief Operating Officer |
131,636 |
2024-09-19 |
|
| 15 |
Subramanian Romesh |
10 Percent Owner, Officer: Chief Scientific Officer |
128,185 |
2020-09-18 |
|
| 16 |
Lucera Erick |
Chief Financial Officer |
125,373 |
2026-04-03 |
|
| 17 |
Scalzo Richard William |
SVP, Head of Finance & Admin. |
122,330 |
2025-03-13 |
|
| 18 |
Freeland Clint |
Exec. VP and CFO |
94,161 |
2018-03-12 |
|
| 19 |
James Catherine C. |
Exec VP and General Counsel |
84,712 |
2018-03-12 |
|
| 20 |
Brumm Joshua T |
CEO & President |
83,269 |
2024-03-12 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Lucera Erick |
Chief Financial Officer |
Informative Sell |
5,727 |
$18.64 |
$106.75K |
| 2026-03-30 |
Posner Brian S |
Director |
Informative Buy |
2,000 |
$17.08 |
$34.16K |
| 2026-03-11 |
Kersten Dirk |
Director |
Informative Sell |
129,672 |
$19.52 |
$2.53M |
| 2026-03-11 |
Posner Brian S |
Director |
Informative Buy |
2,000 |
$19.35 |
$38.7K |
| 2026-03-10 |
Kersten Dirk |
Director |
Informative Sell |
281,858 |
$19.80 |
$5.58M |
| 2026-03-09 |
Kersten Dirk |
Director |
Informative Sell |
177,690 |
$17.72 |
$3.15M |
| 2026-03-06 |
Posner Brian S |
Director |
Informative Buy |
3,000 |
$15.06 |
$45.18K |
| 2026-03-05 |
Friedl-naderer Johanna |
Chief Commercial Officer |
Informative Sell |
148 |
$14.90 |
$2.21K |
| 2026-03-05 |
Kerr Douglas |
Chief Medical Officer |
Informative Sell |
904 |
$14.90 |
$13.47K |
| 2026-03-05 |
Cox John |
CEO & President |
Informative Sell |
2,732 |
$14.90 |
$40.71K |
| 2026-02-12 |
Friedl-naderer Johanna |
Chief Commercial Officer |
RSU Award |
90,000 |
$16.00 |
$1.44M |
| 2026-02-12 |
Kerr Douglas |
Chief Medical Officer |
RSU Award |
130,000 |
$16.00 |
$2.08M |
| 2026-02-12 |
Lucera Erick |
Chief Financial Officer |
RSU Award |
105,000 |
$16.00 |
$1.68M |
| 2026-02-12 |
Cox John |
CEO & President |
RSU Award |
285,000 |
$16.00 |
$4.56M |
| 2025-12-22 |
Karnani Vikram |
Director |
RSU Award |
59,665 |
$20.78 |
$1.24M |
| 2025-12-22 |
Karnani Vikram |
Officer |
Unknown |
- |
- |
- |
| 2025-12-05 |
Friedl-naderer Johanna |
Chief Commercial Officer |
Informative Sell |
144 |
$20.72 |
$2.98K |
| 2025-12-05 |
Kerr Douglas |
Chief Medical Officer |
Informative Sell |
880 |
$20.72 |
$18.23K |
| 2025-12-05 |
Cox John |
CEO & President |
Informative Sell |
2,662 |
$20.72 |
$55.16K |
| 2025-10-01 |
Posner Brian S |
Director |
RSU Award |
70,000 |
$12.50 |
$875K |
| 2025-10-01 |
Posner Brian S |
Director |
Unknown |
- |
- |
- |
| 2025-09-05 |
Cox John |
CEO & President |
Informative Sell |
2,640 |
$13.41 |
$35.4K |
| 2025-09-05 |
Friedl-naderer Johanna |
Chief Commercial Officer |
Informative Sell |
144 |
$13.41 |
$1.93K |
| 2025-09-04 |
Friedl-naderer Johanna |
Chief Commercial Officer |
Informative Sell |
894 |
$13.27 |
$11.86K |
| 2025-09-05 |
Kerr Douglas |
Chief Medical Officer |
Informative Sell |
873 |
$13.41 |
$11.71K |
