Key facts
- This page summarizes Dirk Kersten's Form 4 filing for Dyne Therapeutics, Inc. (DYN).
- 2 reported transactions and 0 derivative rows are listed below.
- Accepted by SEC: 29 Jul 2026, 16:15.
Dirk Kersten - 27 Jul 2026 Form 4 Insider Report for Dyne Therapeutics, Inc. (DYN)
- Reporting relationship
- Director
- Issuer ticker
- DYN
- Reported as of
- 27 Jul 2026
- Net transaction value
- -$6,670,769
- SEC form
- 4
- Accepted by SEC
- 29 Jul 2026, 16:15:04 UTC
- Prior SEC filing
- 24 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Dirk Kersten
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Dirk Kersten filed Form 4 for Dyne Therapeutics, Inc. (DYN) on 29 Jul 2026.
Change
- Previous filing in this sequence was filed on 24 Jun 2026.
- Current net transaction value: -$6,670,769.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001823682
Primary reporting owner
Kersten Dirk
- Relationship
- Director
- Address
- C/O DYNE THERAPEUTICS, INC., 1560 TRAPELO ROAD, WALTHAM
- Signature
- /s/ Dirk Kersten
- Signature date
- 29 Jul 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
DYN
transaction
Common Stock
Sale
- Transaction value
- $6,530,451
- Shares
- -256,072
- Change %
- -6.7%
- Price
- $25.50
- Shares after
- 3,592,184
- Date
- 27 Jul 2026
- Ownership
- See footnote
- Footnotes
- F1, F2, F3, F4
DYN
transaction
Common Stock
Sale
- Transaction value
- $140,319
- Shares
- -5,388
- Change %
- -0.15%
- Price
- $26.04
- Shares after
- 3,586,796
- Date
- 27 Jul 2026
- Ownership
- See footnote
- Footnotes
- F1, F3, F4, F5
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 5 footnotes
Footnote F1
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by ForDyne B.V. ("ForDyne") on November 11, 2025.
Footnote F2
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $25.00 to $25.995, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range(s) set forth in the footnotes of this Form 4.
Footnote F3
The shares are held directly by ForDyne. ForDyne is jointly owned by Forbion Capital Fund IV Cooperatief U.A. ("FCF IV") and Forbion Growth Opportunities Fund II Cooperatief U.A. ("FGO II"). Forbion IV Management B.V. ("Forbion Management") may be deemed to have voting and dispositive power over 2,160,426 of the shares of common stock held by ForDyne. Investment decisions with respect to the shares held by ForDyne can be made by FCPM III Services B.V., the director of Forbion Management, which may delegate such powers to its investment committee which may delegate such powers to the authorized representatives of Forbion Management. Messrs. Slootweg, van Osch, Mulder, van Houten, Reithinger and Boorsma (the "Partners") are partners of FCPM III Services B.V., which acts as the investment advisor to the directors of ForDyne. The Reporting Person is a partner of Forbion Management and a member of the investment committee of Forbion Management.
Footnote F4
(Continued from Footnote 3) Forbion Growth II Management B.V. ("FGO II Management"), the director of FGO II, may be deemed to have voting and dispositive power over 1,426,370 of the shares of common stock held by ForDyne. Investment decisions with respect to the shares held by ForDyne can be made by FCPM III Services B.V., the director of FGO II Management, which may delegate such powers to its investment committee which may delegate such powers to the authorized representatives of FGO II Management. The Partners are partners of FCPM III Services B.V., which acts as the investment advisor to the directors of ForDyne. The Reporting Person is a partner of FGO II Management and a member of the investment committee of FGO II Management. The Reporting Person disclaims beneficial ownership of the shares, except to the extent of his pecuniary interest therein.
Footnote F5
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $26.00 to $26.12, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range(s) set forth in the footnotes of this Form 4.