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United States Biotechnology & Medical Research

Dyne Therapeutics Inc (DYN)

Track

Recent insider activity at Dyne Therapeutics shows a significant volume of proposed and planned sales, primarily from shareholders and affiliates, totaling over $8 million. Notably, CEO John Cox and CMO Douglas Kerr also engaged in planned sales. Conversely, Brian S. Posner made several smaller buy transactions.
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Ticker: DYN Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Atlas Venture Opportunity Fund II, LP
Shareholder
1 sale — total 100,000 USD
Proposed sale 25 Jun 2026
Value US$2,733,704.75 | Price 471.81 | Shares 47,669
Proposed sale 25 Jun 2026
Value US$1,934,289.61 | Price 93.08 | Shares 76,584
Proposed sale 25 Jun 2026
Value US$100,000.00 | Price 20.33 | Shares 1,000
Proposed sale 25 Jun 2026
Value US$100,000.00 | Price 20.37 | Shares 1,000
Proposed sale 24 Jun 2026
Value US$100,000.00 | Price 20.26 | Shares 1,000
Proposed sale 24 Jun 2026
Value US$100,000.00 | Price 20.26 | Shares 1,000
Proposed sale 24 Jun 2026
Value US$100,000.00 | Price 20.26 | Shares 1,000
Planned sale 23 Jun 2026
Value US$100,000.00 | Price 21.47 | Shares 1,000
Planned sale 23 Jun 2026
Value US$100,000.00 | Price 21.04 | Shares 1,000
Proposed sale 23 Jun 2026
Value US$100,000.00 | Price 20.87 | Shares 1,000
Proposed sale 23 Jun 2026
Value US$100,000.00 | Price 20.87 | Shares 1,000
Planned sale 22 Jun 2026
Value US$100,000.00 | Price 20.57 | Shares 1,000
Proposed sale 22 Jun 2026
Value US$100,000.00 | Price 20.87 | Shares 1,000
Planned sale 18 Jun 2026
Value US$100,000.00 | Price 20.07 | Shares 1,000
Planned sale 17 Jun 2026
Value US$100,000.00 | Price 20.14 | Shares 1,000
Proposed sale 17 Jun 2026
Value US$100,000.00 | Price 18.33 | Shares 1,000
Planned sale 16 Jun 2026
Value US$100,000.00 | Price 18.33 | Shares 1,000
Planned sale 16 Jun 2026
Value US$100,000.00 | Price 18.33 | Shares 1,000
Proposed sale 16 Jun 2026
Value US$100,000.00 | Price 18.33 | Shares 1,000
Planned sale 16 Jun 2026
Value US$100,000.00 | Price 18.33 | Shares 1,000
Buy 8 Jun 2026
Value US$100,000.00 | Price 16.94 | Shares 1,000
Buy 3 Jun 2026
Value US$100,000.00 | Price 17.48 | Shares 1,000
Buy 3 Jun 2026
Value US$100,000.00 | Price 17.48 | Shares 1,000
Buy 26 May 2026
Value US$36,420.00 | Price 18.21 | Shares 2,000
Buy 20 May 2026
Value US$42,800.00 | Price 17.12 | Shares 2,500
Planned sale 13 May 2026
Value US$4,186.08 | Price 18.36 | Shares 228
Planned sale 13 May 2026
Value US$60,789.96 | Price 18.36 | Shares 3,311
Proposed sale 13 May 2026
Value US$60,805.00 | Price 18.36 | Shares 3,311
Planned sale 13 May 2026
Value US$28,715.04 | Price 18.36 | Shares 1,564
Planned sale 13 May 2026
Value US$26,585.28 | Price 18.36 | Shares 1,448
Proposed sale 13 May 2026
Value US$26,592.00 | Price 18.36 | Shares 1,448
Planned sale 6 May 2026
Value US$313,495.92 | Price 18.18 | Shares 17,244
Planned sale 6 May 2026
Value US$7,781.04 | Price 18.18 | Shares 428
Planned sale 6 May 2026
Value US$793,029.78 | Price 18.18 | Shares 43,621
Planned sale 6 May 2026
Value US$398,614.68 | Price 18.18 | Shares 21,926
Proposed sale 6 May 2026
Value US$762,058.87 | Price 17.47 | Shares 43,621
Proposed sale 6 May 2026
Value US$7,477.16 | Price 17.47 | Shares 428
Proposed sale 6 May 2026
Value US$301,252.68 | Price 17.47 | Shares 17,244
Proposed sale 6 May 2026
Value US$383,047.22 | Price 17.47 | Shares 21,926
Planned sale 5 May 2026
Value US$43,326.09 | Price 18.03 | Shares 2,403
Planned sale 5 May 2026
Value US$1,081.80 | Price 18.03 | Shares 60
Planned sale 5 May 2026
Value US$109,640.43 | Price 18.03 | Shares 6,081
Planned sale 5 May 2026
Value US$55,099.68 | Price 18.03 | Shares 3,056
Proposed sale 5 May 2026
Value US$107,694.51 | Price 17.71 | Shares 6,081
Proposed sale 5 May 2026
Value US$54,121.76 | Price 17.71 | Shares 3,056
Proposed sale 5 May 2026
Value US$42,557.13 | Price 17.71 | Shares 2,403
Proposed sale 5 May 2026
Value US$1,062.60 | Price 17.71 | Shares 60
Planned sale 4 May 2026
Value US$44,388.00 | Price 18.00 | Shares 2,466
Planned sale 4 May 2026
Value US$1,098.00 | Price 18.00 | Shares 61
Planned sale 4 May 2026
Value US$112,338.00 | Price 18.00 | Shares 6,241
Planned sale 4 May 2026
Value US$56,448.00 | Price 18.00 | Shares 3,136
Proposed sale 4 May 2026
Value US$42,883.74 | Price 17.39 | Shares 2,466
Proposed sale 4 May 2026
Value US$108,530.99 | Price 17.39 | Shares 6,241
Proposed sale 4 May 2026
Value US$54,535.04 | Price 17.39 | Shares 3,136
Proposed sale 29 Apr 2026
Value US$1,060.79 | Price 17.39 | Shares 61
Planned sale 28 Apr 2026
Value US$399.00 | Price 19.00 | Shares 21
Planned sale 28 Apr 2026
Value US$19.00 | Price 19.00 | Shares 1
Planned sale 28 Apr 2026
Value US$988.00 | Price 19.00 | Shares 52
Planned sale 28 Apr 2026
Value US$494.00 | Price 19.00 | Shares 26
Planned sale 28 Apr 2026
Value US$865,367.16 | Price 18.38 | Shares 47,082
Planned sale 28 Apr 2026
Value US$21,504.60 | Price 18.38 | Shares 1,170
Planned sale 28 Apr 2026
Value US$2,189,333.70 | Price 18.38 | Shares 119,115
Planned sale 28 Apr 2026
Value US$1,100,410.60 | Price 18.38 | Shares 59,870
Proposed sale 28 Apr 2026
Value US$849,738.12 | Price 18.04 | Shares 47,103
Proposed sale 28 Apr 2026
Value US$21,124.84 | Price 18.04 | Shares 1,171
Proposed sale 28 Apr 2026
Value US$2,149,772.68 | Price 18.04 | Shares 119,167
Proposed sale 28 Apr 2026
Value US$1,079,441.44 | Price 18.04 | Shares 59,836
Planned sale 27 Apr 2026
Value US$652,438.05 | Price 18.15 | Shares 35,947
Planned sale 27 Apr 2026
Value US$16,226.10 | Price 18.15 | Shares 894
Planned sale 27 Apr 2026
Value US$1,650,615.45 | Price 18.15 | Shares 90,943
Planned sale 27 Apr 2026
Value US$829,618.35 | Price 18.15 | Shares 45,709
Proposed sale 27 Apr 2026
Value US$656,392.22 | Price 18.26 | Shares 35,947
Proposed sale 27 Apr 2026
Value US$1,660,619.18 | Price 18.26 | Shares 90,943
Proposed sale 27 Apr 2026
Value US$16,324.44 | Price 18.26 | Shares 894
Proposed sale 27 Apr 2026
Value US$834,646.34 | Price 18.26 | Shares 45,709
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-25 2026-06-25 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
47,669
471.81
US$2,733,705 		47,669 471.81 US$2,733,705
2026-06-25 2026-06-25 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
76,584
93.08
US$1,934,290 		76,584 93.08 US$1,934,290
2026-06-25 2026-06-25 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
60,754
96.15
US$783,158 		60,754 96.15 US$783,158
2026-06-25 2026-06-25 PrS Proposed sale
3.7
Lucera Erick

Officer

Officer
1,000
20.37
US$100,000 		1,000 20.37 US$100,000
2026-06-24 2026-06-24 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
1,000
20.26
US$100,000 		1,000 20.26 US$100,000
2026-06-24 2026-06-24 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
1,000
20.26
US$100,000 		1,000 20.26 US$100,000
2026-06-24 2026-06-24 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
1,000
20.26
US$100,000 		1,000 20.26 US$100,000
2026-06-24 2026-06-23 PlS Planned sale
3.9
Kersten Dirk
Non-Executive Director
1,000 -0.0%
21.47
US$100,000 		1,000 -0.0% 21.47 US$100,000
2026-06-24 2026-06-23 PlS Planned sale
3.9
Kersten Dirk
Non-Executive Director
1,000 -1.8%
21.04
US$100,000 		1,000 -1.8% 21.04 US$100,000
2026-06-23 2026-06-23 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
1,000
20.87
US$100,000 		1,000 20.87 US$100,000
2026-06-23 2026-06-23 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
1,000
20.87
US$100,000 		1,000 20.87 US$100,000
2026-06-24 2026-06-22 PlS Planned sale
3.9
Kersten Dirk
Non-Executive Director
1,000 -4.6%
20.57
US$100,000 		1,000 -4.6% 20.57 US$100,000
2026-06-23 2026-06-22 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
1,000
20.87
US$100,000 		1,000 20.87 US$100,000
2026-06-22 2026-06-18 PlS Planned sale
3.9
Kersten Dirk
Non-Executive Director
1,000 -1.1%
20.07
US$100,000 		1,000 -1.1% 20.07 US$100,000
2026-06-22 2026-06-17 PlS Planned sale
3.9
Kersten Dirk
Non-Executive Director
1,000 -0.9%
20.14
US$100,000 		1,000 -0.9% 20.14 US$100,000
2026-06-17 2026-06-17 PrS Proposed sale
ForDyne B.V.

Affiliate
1,000
18.33
US$100,000 		1,000 18.33 US$100,000
2026-06-17 2026-06-16 PlS Planned sale
Kerr Douglas

Chief Medical Officer

Officer
1,000 -0.5%
18.33
US$100,000 		1,000 -0.5% 18.33 US$100,000
2026-06-17 2026-06-16 PlS Planned sale
2.1
Cox John

CEO & President

Executive Director
1,000 -0.7%
18.33
US$100,000 		1,000 -0.7% 18.33 US$100,000
2026-06-17 2026-06-16 PlS Planned sale
0.9
Friedl-Naderer Johanna

Chief Commercial Officer

Officer
1,000 -0.1%
18.33
US$100,000 		1,000 -0.1% 18.33 US$100,000
2026-06-16 2026-06-16 PrS Proposed sale
2.1
Cox John

Officer

Officer
1,000
18.33
US$100,000 		1,000 18.33 US$100,000
2026-06-09 2026-06-08 B Purchase
3.5
Posner Brian S
Non-Executive Director
1,000 +8.9%
16.94
US$100,000 		1,000 +8.9% 16.94 US$100,000
2026-06-05 2026-06-03 B Purchase
3.5
Posner Brian S
Non-Executive Director
1,000 +12.5%
17.48
US$100,000 		1,000 +12.5% 17.48 US$100,000
2026-06-05 2026-06-03 B Purchase
3.5
Posner Brian S
Non-Executive Director
1,000 +12.5%
17.48
US$100,000 		1,000 +12.5% 17.48 US$100,000
2026-05-28 2026-05-26 B Purchase
3.5
Posner Brian S
Non-Executive Director
2,000 +11.1%
18.21
US$36,420 		2,000 +11.1% 18.21 US$36,420
2026-05-22 2026-05-20 B Purchase
3.5
Posner Brian S
Non-Executive Director
2,500 +16.1%
17.12
US$42,800 		2,500 +16.1% 17.12 US$42,800
2026-05-14 2026-05-13 PlS Planned sale
0.9
Friedl-Naderer Johanna

Chief Commercial Officer

Officer
228 -0.1%
18.36
US$4,186 		228 -0.1% 18.36 US$4,186
2026-05-14 2026-05-13 PlS Planned sale
2.1
Cox John

CEO & President

Executive Director
3,311 -0.9%
18.36
US$60,790 		3,311 -0.9% 18.36 US$60,790
2026-05-14 2026-05-13 PlS Planned sale
Kerr Douglas

Chief Medical Officer

Officer
1,564 -0.9%
18.36
US$28,715 		1,564 -0.9% 18.36 US$28,715
2026-05-14 2026-05-13 PlS Planned sale
3.7
Lucera Erick

Chief Financial Officer

Officer
1,448 -1.2%
18.36
US$26,585 		1,448 -1.2% 18.36 US$26,585
2026-05-13 2026-05-13 PrS Proposed sale
2.1
Cox John

Officer

Officer
3,311
18.36
US$60,805 		3,311 18.36 US$60,805
2026-05-13 2026-05-13 PrS Proposed sale
3.7
Lucera Erick

Officer

Officer
1,448
18.36
US$26,592 		1,448 18.36 US$26,592
2026-05-06 2026-05-06 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
17,244 -1.5%
18.18
US$313,496 		17,244 -1.5% 18.18 US$313,496
2026-05-06 2026-05-06 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
428 -5.1%
18.18
US$7,781 		428 -5.1% 18.18 US$7,781
2026-05-06 2026-05-06 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
43,621 -0.9%
18.18
US$793,030 		43,621 -0.9% 18.18 US$793,030
2026-05-06 2026-05-06 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
21,926 -1.4%
18.18
US$398,615 		21,926 -1.4% 18.18 US$398,615
2026-05-06 2026-05-06 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
43,621
17.47
US$762,059 		43,621 17.47 US$762,059
2026-05-06 2026-05-06 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
428
17.47
US$7,477 		428 17.47 US$7,477
2026-05-06 2026-05-06 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
17,244
17.47
US$301,253 		17,244 17.47 US$301,253
2026-05-06 2026-05-06 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
21,926
17.47
US$383,047 		21,926 17.47 US$383,047
2026-05-06 2026-05-05 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
2,403 -0.2%
18.03
US$43,326 		2,403 -0.2% 18.03 US$43,326
2026-05-06 2026-05-05 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
60 -0.7%
18.03
US$1,082 		60 -0.7% 18.03 US$1,082
2026-05-06 2026-05-05 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
6,081 -0.1%
18.03
US$109,640 		6,081 -0.1% 18.03 US$109,640
2026-05-06 2026-05-05 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
3,056 -0.2%
18.03
US$55,100 		3,056 -0.2% 18.03 US$55,100
2026-05-05 2026-05-05 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
6,081
17.71
US$107,695 		6,081 17.71 US$107,695
2026-05-05 2026-05-05 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
3,056
17.71
US$54,122 		3,056 17.71 US$54,122
2026-05-05 2026-05-05 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
2,403
17.71
US$42,557 		2,403 17.71 US$42,557
2026-05-05 2026-05-05 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
60
17.71
US$1,063 		60 17.71 US$1,063
2026-05-06 2026-05-04 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
2,466 -0.2%
18.00
US$44,388 		2,466 -0.2% 18.00 US$44,388
2026-05-06 2026-05-04 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
61 -0.7%
18.00
US$1,098 		61 -0.7% 18.00 US$1,098
2026-05-06 2026-05-04 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
6,241 -0.1%
18.00
US$112,338 		6,241 -0.1% 18.00 US$112,338
2026-05-06 2026-05-04 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
3,136 -0.2%
18.00
US$56,448 		3,136 -0.2% 18.00 US$56,448
2026-05-04 2026-05-04 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
2,466
17.39
US$42,884 		2,466 17.39 US$42,884
2026-05-04 2026-05-04 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
6,241
17.39
US$108,531 		6,241 17.39 US$108,531
2026-05-04 2026-05-04 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
3,136
17.39
US$54,535 		3,136 17.39 US$54,535
2026-05-04 2026-04-29 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
61
17.39
US$1,061 		61 17.39 US$1,061
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
21 -0.0%
19.00
US$399 		21 -0.0% 19.00 US$399
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
1 -0.0%
19.00
US$19 		1 -0.0% 19.00 US$19
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
52 -0.0%
19.00
US$988 		52 -0.0% 19.00 US$988
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
26 -0.0%
19.00
US$494 		26 -0.0% 19.00 US$494
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
47,082 -3.9%
18.38
US$865,367 		47,082 -3.9% 18.38 US$865,367
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
1,170 -12.1%
18.38
US$21,505 		1,170 -12.1% 18.38 US$21,505
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
119,115 -2.4%
18.38
US$2,189,334 		119,115 -2.4% 18.38 US$2,189,334
2026-04-30 2026-04-28 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
59,870 -3.7%
18.38
US$1,100,411 		59,870 -3.7% 18.38 US$1,100,411
2026-04-28 2026-04-28 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
47,103
18.04
US$849,738 		47,103 18.04 US$849,738
2026-04-28 2026-04-28 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
1,171
18.04
US$21,125 		1,171 18.04 US$21,125
2026-04-28 2026-04-28 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
119,167
18.04
US$2,149,773 		119,167 18.04 US$2,149,773
2026-04-28 2026-04-28 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
59,836
18.04
US$1,079,441 		59,836 18.04 US$1,079,441
2026-04-27 2026-04-27 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
35,947 -2.9%
18.15
US$652,438 		35,947 -2.9% 18.15 US$652,438
2026-04-27 2026-04-27 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
894 -8.5%
18.15
US$16,226 		894 -8.5% 18.15 US$16,226
2026-04-27 2026-04-27 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
90,943 -1.8%
18.15
US$1,650,615 		90,943 -1.8% 18.15 US$1,650,615
2026-04-27 2026-04-27 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
45,709 -2.7%
18.15
US$829,618 		45,709 -2.7% 18.15 US$829,618
2026-04-27 2026-04-27 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
35,947
18.26
US$656,392 		35,947 18.26 US$656,392
2026-04-27 2026-04-27 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
90,943
18.26
US$1,660,619 		90,943 18.26 US$1,660,619
2026-04-27 2026-04-27 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
894
18.26
US$16,324 		894 18.26 US$16,324
2026-04-27 2026-04-27 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
45,709
18.26
US$834,646 		45,709 18.26 US$834,646
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