Kersten Dirk 4
4 · Dyne Therapeutics, Inc. · Filed Apr 17, 2026
Research Summary
AI-generated summary of this filing
Dyne Therapeutics (DYN) Director Dirk Kersten Sells 99,613 Shares
What Happened
Dirk Kersten, a director of Dyne Therapeutics (DYN), disposed of a total of 99,613 shares in open-market sales on April 15–16, 2026, generating aggregate proceeds of about $2.03 million. The sales were executed pursuant to a Rule 10b5-1 trading plan adopted by ForDyne B.V. on November 11, 2025. Specific transactions reported: 81,840 shares (weighted avg $20.27) for $1,659,044; 11,116 shares (weighted avg $21.10) for $234,591; and 6,657 shares (weighted avg $20.06) for $133,523. These were sales (not purchases), which are often routine dispositions under prearranged plans.
Key Details
- Transaction dates: April 15, 2026 (81,840 shares) and April 16, 2026 (11,116 and 6,657 shares).
- Reported proceeds: approximately $2,027,158 total.
- Prices: weighted-average prices reported; individual execution prices fell in ranges noted in the filing:
- 81,840 shares: weighted avg $20.27 (executions within $20.00–$20.99).
- 11,116 shares: weighted avg $21.10 (executions within $21.00–$21.345).
- 6,657 shares: weighted avg $20.06 (executions within $20.00–$20.16).
- Plan: Sales made pursuant to a Rule 10b5-1 trading plan adopted by ForDyne B.V. on Nov 11, 2025.
- Ownership/agency: The shares were held directly by ForDyne B.V.; footnotes describe Forbion-related entities and partners (including Kersten) that may be deemed to have voting/dispositive power over portions of ForDyne’s holdings. The reporting person disclaims beneficial ownership except to the extent of his pecuniary interest.
- Filing timeliness: Form 4 was filed April 17, 2026; filing appears timely under the two-business-day rule.
Context
- These were sales executed via a pre-established 10b5-1 plan, which is a common mechanism for insiders to sell shares according to a preset schedule and is typically treated as routine rather than an ad hoc signal of company prospects.
- The filing provides weighted-average prices and execution ranges; the reporting person has offered to supply full per-price breakdowns on request.
- This was institutional/managed trading through ForDyne rather than a direct personal open-market sale by an individual beneficial owner; footnotes describe the chain of management and delegation among Forbion-related entities.
Insider Transaction Report
Form 4
Kersten Dirk
Director
Transactions
- Sale
Common Stock
[F1][F2][F3][F4]2026-04-15$20.27/sh−81,840$1,659,044→ 4,562,546 total(indirect: See footnote) - Sale
Common Stock
[F1][F5][F3][F4]2026-04-16$21.10/sh−11,116$234,591→ 4,551,430 total(indirect: See footnote) - Sale
Common Stock
[F1][F6][F3][F4]2026-04-16$20.06/sh−6,657$133,523→ 4,544,773 total(indirect: See footnote)
Footnotes (6)
- [F1]This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by ForDyne B.V. ("ForDyne") on November 11, 2025.
- [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 $20.00 to $20.99, 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.
- [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 3,118,403 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.
- [F4](Continued from Footnote 2) 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.
- [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 $21.00 to $21.345, 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.
- [F6]The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $20.00 to $20.16, 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.
Signature
/s/ Dirk Kersten|2026-04-17