Form4insider filings, from the source

Company · CIK 0001818794 · SIC 2834 — Pharmaceutical Preparations · Nasdaq

Dyne Therapeutics, Inc. · DYN

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $78k · 2sales $113.8M · 18net −$113.7M
$10k$10k$1M$1M$100M$100MbuyssalesJun 2Jun 18Jul 5Jul 21Aug 7Aug 23Sep 9

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 8, 2026 SForm 4 →Sep 8, 4:13 pm EDTJohn CoxCEO & President, Director5,658$18.88$106,823357,507−1.56%10b5-1
Sep 4, 2026 SForm 4 →Sep 8, 4:15 pm EDTJohanna Friedl-NadererChief Commercial Officer1,085$23.42$25,408152,897−0.70%10b5-1
Sep 4, 2026 SForm 4 →Sep 8, 4:14 pm EDTDouglas KerrChief Medical Officer5,035$22.95$115,546162,564−3.00%10b5-1
Aug 13, 2026 SForm 4 →Aug 17, 5:30 pm EDTJason P RhodesDirector2,586,928$25.20$65,184,894428,946−85.8%10b5-1
Aug 13, 2026 SForm 4 →Aug 17, 4:08 pm EDTJohanna Friedl-NadererChief Commercial Officer226$26.28$5,939153,982−0.15%10b5-1
Aug 13, 2026 SForm 4 →Aug 17, 4:08 pm EDTDouglas KerrChief Medical Officer1,556$26.28$40,892167,599−0.92%10b5-1
Aug 13, 2026 SForm 4 →Aug 17, 4:07 pm EDTJohn CoxCEO & President, Director4,986$26.28$131,032363,165−1.35%10b5-1
Aug 13, 2026 SForm 4 →Aug 17, 4:06 pm EDTErick LuceraChief Financial Officer1,797$26.28$47,225119,766−1.48%10b5-1
Jul 27, 2026 SForm 4 →Jul 29, 4:15 pm EDTDirk KerstenDirector261,460$25.51$6,670,7693,586,796−6.79%10b5-1
Jul 6, 2026 SForm 4 →Jul 8, 5:35 pm EDTJason P RhodesDirector777,451$22.97$17,858,4922,962−99.6%10b5-1
Jun 26, 2026 SForm 4 →Jun 30, 7:05 pm EDTJason P RhodesDirector504,695$21.23$10,712,550975,931−34.1%10b5-1
Jun 25, 2026 SForm 4 →Jun 26, 4:15 pm EDTErick LuceraChief Financial Officer2,362$20.37$48,114121,563−1.91%
Jun 23, 2026 SForm 4 →Jun 26, 8:40 am EDTJason P RhodesDirector267,760$21.09$5,646,4971,081,044−19.9%10b5-1 late
Jun 22, 2026 SForm 4 →Jun 24, 4:27 pm EDTDirk KerstenDirector263,962$20.70$5,464,6113,848,256−6.42%10b5-1
Jun 17, 2026 SForm 4 →Jun 22, 4:15 pm EDTDirk KerstenDirector84,355$20.10$1,695,6894,112,218−2.01%10b5-1
Jun 16, 2026 SForm 4 →Jun 17, 4:08 pm EDTDouglas KerrChief Medical Officer887$18.33$16,259169,155−0.52%10b5-1
Jun 16, 2026 SForm 4 →Jun 17, 4:07 pm EDTJohanna Friedl-NadererChief Commercial Officer145$18.33$2,658154,208−0.09%10b5-1
Jun 16, 2026 SForm 4 →Jun 17, 4:07 pm EDTJohn CoxCEO & President, Director2,683$18.33$49,179368,151−0.72%10b5-1
Jun 8, 2026 PForm 4 →Jun 9, 5:06 pm EDTBrian S PosnerDirector2,000$16.94$33,88024,500+8.89%
Jun 3, 2026 PForm 4 →Jun 5, 4:10 pm EDTBrian S PosnerDirector2,500$17.48$43,70022,500+12.5%

Reported at this company — derivatives (options, RSUs, warrants)

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Jun 22, 2026 AForm 4 →Jun 23, 4:07 pm EDTBarry E GreeneDirector57,463——57,463—
Jun 5, 2026 AForm 4 →Jun 9, 5:15 pm EDTEdward HurwitzDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:13 pm EDTDavid Charles LubnerDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:13 pm EDTJason P RhodesDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:12 pm EDTDirk KerstenDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:12 pm EDTCarlo IncertiDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:09 pm EDTCatherine Stehman-BreenDirector35,152——35,152—
Jun 5, 2026 AForm 4 →Jun 9, 5:06 pm EDTBrian S PosnerDirector35,152——35,152—