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United States Biotechnology & Medical Research

Dyne Therapeutics Inc (DYN)

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Over the last 90 days, Dyne Therapeutics Inc. saw significant insider selling activity, with a net value of -$69,087,181. While there were 111 transactions, the net value was heavily influenced by large sell-offs. Notably, several officers and shareholders engaged in planned and proposed sales, contrasting with a few smaller buy transactions by Brian S. Posner.
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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
ForDyne B.V.
Affiliate
1 sale — total 100,000 USD
Proposed sale 17 Jun 2026
Value US$4,086,578.14 | Price 63.47 | Shares 43,480
Planned sale 16 Jun 2026
Value US$2,685,825.77 | Price 420.05 | Shares 74,632
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
Planned sale 24 Apr 2026
Value US$528,213.84 | Price 18.48 | Shares 28,583
Planned sale 24 Apr 2026
Value US$13,120.80 | Price 18.48 | Shares 710
Planned sale 24 Apr 2026
Value US$1,336,288.80 | Price 18.48 | Shares 72,310
Planned sale 24 Apr 2026
Value US$671,655.60 | Price 18.48 | Shares 36,345
Proposed sale 24 Apr 2026
Value US$540,218.70 | Price 18.90 | Shares 28,583
Proposed sale 24 Apr 2026
Value US$1,366,659.00 | Price 18.90 | Shares 72,310
Proposed sale 24 Apr 2026
Value US$686,920.50 | Price 18.90 | Shares 36,345
Proposed sale 24 Apr 2026
Value US$13,419.00 | Price 18.90 | Shares 710
Planned sale 23 Apr 2026
Value US$290,690.12 | Price 19.19 | Shares 15,148
Planned sale 23 Apr 2026
Value US$7,234.63 | Price 19.19 | Shares 377
Planned sale 23 Apr 2026
Value US$735,399.18 | Price 19.19 | Shares 38,322
Planned sale 23 Apr 2026
Value US$369,618.59 | Price 19.19 | Shares 19,261
Proposed sale 23 Apr 2026
Value US$297,961.16 | Price 19.67 | Shares 15,148
Proposed sale 23 Apr 2026
Value US$753,793.74 | Price 19.67 | Shares 38,322
Proposed sale 23 Apr 2026
Value US$378,863.87 | Price 19.67 | Shares 19,261
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
2026-06-17 2026-06-17 PrS Proposed sale
ForDyne B.V.

Affiliate
43,480
63.47
US$4,086,578 		43,480 63.47 US$4,086,578
2026-06-17 2026-06-16 PlS Planned sale
Kerr Douglas

Chief Medical Officer

Officer
74,632 -46.9%
420.05
US$2,685,826 		74,632 -46.9% 420.05 US$2,685,826
2026-06-17 2026-06-16 PlS Planned sale
2.1
Cox John

CEO & President

Executive Director
95,382 +34.6%
464.77
US$2,784,558 		95,382 +34.6% 464.77 US$2,784,558
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
2026-04-27 2026-04-24 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
28,583 -2.2%
18.48
US$528,214 		28,583 -2.2% 18.48 US$528,214
2026-04-27 2026-04-24 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
710 -6.3%
18.48
US$13,121 		710 -6.3% 18.48 US$13,121
2026-04-27 2026-04-24 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
72,310 -1.4%
18.48
US$1,336,289 		72,310 -1.4% 18.48 US$1,336,289
2026-04-27 2026-04-24 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
36,345 -2.1%
18.48
US$671,656 		36,345 -2.1% 18.48 US$671,656
2026-04-24 2026-04-24 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
28,583
18.90
US$540,219 		28,583 18.90 US$540,219
2026-04-24 2026-04-24 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
72,310
18.90
US$1,366,659 		72,310 18.90 US$1,366,659
2026-04-24 2026-04-24 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
36,345
18.90
US$686,920 		36,345 18.90 US$686,920
2026-04-24 2026-04-24 PrS Proposed sale
Atlas Venture Associates XI, LP

Shareholder
710
18.90
US$13,419 		710 18.90 US$13,419
2026-04-27 2026-04-23 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
15,148 -1.2%
19.19
US$290,690 		15,148 -1.2% 19.19 US$290,690
2026-04-27 2026-04-23 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
377 -3.2%
19.19
US$7,235 		377 -3.2% 19.19 US$7,235
2026-04-27 2026-04-23 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
38,322 -0.7%
19.19
US$735,399 		38,322 -0.7% 19.19 US$735,399
2026-04-27 2026-04-23 PlS Planned sale
3.5
Rhodes Jason P
Non-Executive Director
19,261 -1.1%
19.19
US$369,619 		19,261 -1.1% 19.19 US$369,619
2026-04-23 2026-04-23 PrS Proposed sale
Atlas Venture Opportunity Fund I, LP

Shareholder
15,148
19.67
US$297,961 		15,148 19.67 US$297,961
2026-04-23 2026-04-23 PrS Proposed sale
2.0
Atlas Venture Fund XI, LP

Shareholder
38,322
19.67
US$753,794 		38,322 19.67 US$753,794
2026-04-23 2026-04-23 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, LP

Shareholder
19,261
19.67
US$378,864 		19,261 19.67 US$378,864
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