LYTIR

Company · DYN

Dyne Therapeutics, Inc.

Nasdaq's symbol directory lists DYN on Nasdaq as “Dyne Therapeutics, Inc. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 1 occasion ($40K); insiders sold on 22 occasions ($113.6M); 3 filings by holders of 5% or more; 2 company reports (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $40K in total; Insider sales: $113.6M in total.Jun: Insider sales $23.6MJul: Insider sales $24.5MAug: Insider sales $65.4MOct: Insider purchases $40KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $40KInsider sales below: $113.6M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Rhodes Jason P sold on 9 days all under a 10b5-1 plan latest Aug 14, 2026 sold $99.4M
  2. Dirk Kersten sold on 5 days all under a 10b5-1 plan latest Jul 27, 2026 sold $13.8M
  3. Cox John, CEO & President sold on 2 days all under a 10b5-1 plan latest Aug 13, 2026 sold $180K
  4. Lucera Erick, Chief Financial Officer sold on 2 days 1 of them under a 10b5-1 plan latest Aug 13, 2026 sold $95K
  5. Kerr Douglas, Chief Medical Officer sold on 2 days all under a 10b5-1 plan latest Aug 13, 2026 sold $57K
  6. Posner Brian S bought on 1 day latest Oct 2, 2026 bought $40K
  7. Friedl-Naderer Johanna, Chief Commercial Officer sold on 2 days all under a 10b5-1 plan latest Aug 13, 2026 sold $9K
Every trade (23)
  1. BUYPosner Brian S bought Oct 2, 2026 2,500 shares filing $40K
  2. SELLRhodes Jason P sold Aug 14, 2026 2,160,516 shares 3 legs combined 10b5-1 plan (scheduled) filing $54.0M
  3. SELLRhodes Jason P sold Aug 13, 2026 426,412 shares 3 legs combined 10b5-1 plan (scheduled) filing $11.2M
  4. SELLCox John, CEO & President sold Aug 13, 2026 4,986 shares 10b5-1 plan (scheduled) filing $131K
  5. SELLLucera Erick, Chief Financial Officer sold Aug 13, 2026 1,797 shares 10b5-1 plan (scheduled) filing $47K
  6. SELLKerr Douglas, Chief Medical Officer sold Aug 13, 2026 1,556 shares 10b5-1 plan (scheduled) filing $41K
  7. SELLFriedl-Naderer Johanna, Chief Commercial Officer sold Aug 13, 2026 226 shares 10b5-1 plan (scheduled) filing $6K
  8. SELLDirk Kersten sold Jul 27, 2026 261,460 shares 2 legs combined 10b5-1 plan (scheduled) filing $6.7M
  9. SELLRhodes Jason P sold Jul 7, 2026 297,211 shares 7 legs combined 10b5-1 plan (scheduled) filing $6.9M
  10. SELLRhodes Jason P sold Jul 6, 2026 480,240 shares 3 legs combined 10b5-1 plan (scheduled) filing $10.9M
  11. SELLRhodes Jason P sold Jun 29, 2026 195,427 shares 3 legs combined 10b5-1 plan (scheduled) filing $4.1M
  12. SELLRhodes Jason P sold Jun 26, 2026 309,268 shares 3 legs combined 10b5-1 plan (scheduled) filing $6.6M
  13. SELLRhodes Jason P sold Jun 25, 2026 24,100 shares 3 legs combined 10b5-1 plan (scheduled) filing $509K
  14. SELLLucera Erick, Chief Financial Officer sold Jun 25, 2026 2,362 shares filing $48K
  15. SELLRhodes Jason P sold Jun 24, 2026 95,900 shares 3 legs combined 10b5-1 plan (scheduled) filing $2.0M
  16. SELLRhodes Jason P sold Jun 23, 2026 147,760 shares 3 legs combined 10b5-1 plan (scheduled) filing $3.1M
  17. SELLDirk Kersten sold Jun 23, 2026 73,286 shares 2 legs combined 10b5-1 plan (scheduled) filing $1.5M
  18. SELLDirk Kersten sold Jun 22, 2026 190,676 shares 10b5-1 plan (scheduled) filing $3.9M
  19. SELLDirk Kersten sold Jun 18, 2026 46,901 shares 10b5-1 plan (scheduled) filing $941K
  20. SELLDirk Kersten sold Jun 17, 2026 37,454 shares 10b5-1 plan (scheduled) filing $754K
  21. SELLCox John, CEO & President sold Jun 16, 2026 2,683 shares 10b5-1 plan (scheduled) filing $49K
  22. SELLKerr Douglas, Chief Medical Officer sold Jun 16, 2026 887 shares 10b5-1 plan (scheduled) filing $16K
  23. SELLFriedl-Naderer Johanna, Chief Commercial Officer sold Jun 16, 2026 145 shares 10b5-1 plan (scheduled) filing $3K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. JANUS HENDERSON GROUP Ltd. filed Aug 13, 2026 Schedule 13G/A passive filing 7.3%
  2. Atlas Venture Fund XI, L.P. filed Aug 13, 2026 Schedule 13G/A passive filing 2.4%
  3. FMR LLC filed Aug 6, 2026 Schedule 13G/A passive 11,206,999 shares filing 6.8%

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Results of operations and financial condition filing Nov 5, 2026
  2. Regulation FD disclosure; Other events filing Sep 29, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.