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$DYN All transactions

Dyne Therapeutics, Inc.

▼ SELL 10b5-1 Plan

$ Value

$55K

Shares

2,662

Price

$21

Filed

Dec 5

Insider

Name

Cox John

Title

CEO & President

CIK

0001498428

Roles

Director Officer

Transaction Details

Transaction Date

2025-12-05

Code

S

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

196,877

Footnotes

Represents shares automatically sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting of restricted stock units granted to the Reporting Person on December 4, 2024. The automatic sale of the Reporting Person's shares is provided for in a restricted stock unit agreement constituting a "binding contract" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the Reporting Person. | The Reporting Person's sale of shares of Common Stock reported herein was matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), to the extent of 2,662 shares, with the Reporting Person's purchase of 100,000 shares on July 14, 2025. The Reporting Person has paid to the Issuer an aggregate amount of $31,111.88, representing the amount of the profit deemed realized in connection with the short-swing transaction under Section 16(b) of the Exchange Act. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $20.58 to $20.96, 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 set forth in this footnote of this Form 4. | Includes 108,976 unvested RSUs. | These shares are held in a trust for the benefit of a child of the Reporting Person.

Filing Info

Accession No.

0001193125-25-309666

Form Type

4

Issuer CIK

0001818794

Cox John's History

Date Ticker Type Value
2025-12-05 DYN $55K
2025-09-05 DYN $35K
2025-07-16 DYN A $0
2025-07-15 DYN G $0
2025-07-15 DYN G $0
2025-07-15 DYN G $0
2025-07-15 DYN G $0
2025-07-14 DYN $911K
2025-06-05 DYN $54K

Other Insiders at DYN (90d)

Insider Bought Sold Last
Posner Brian S $34K 2026-03-30
Rhodes Jason P $16.5M 2026-04-22
Lucera Erick
Chief Financial Officer
$107K 2026-04-01
Kersten Dirk $9.1M 2026-04-22