Jason P. Rhodes - 06 Jul 2026 Form 4 Insider Report for Dyne Therapeutics, Inc. (DYN)

Reporting relationship: Director
Issuer ticker: DYN
Reported as of: 06 Jul 2026
Net transaction value: -$17,858,492
SEC form: 4
Accepted by SEC: 08 Jul 2026, 17:35:11 UTC
Prior SEC filing: 30 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Ommer Chohan, Attorney-in-Fact

Key filing fact

Jason P. Rhodes filed Form 4 for Dyne Therapeutics, Inc. (DYN) on 08 Jul 2026.

Key facts

This page summarizes Jason P. Rhodes's Form 4 filing for Dyne Therapeutics, Inc. (DYN).
10 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 08 Jul 2026, 17:35.

Change

Previous filing in this sequence was filed on 30 Jun 2026.
Current net transaction value: -$17,858,492.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001577014 Primary reporting owner

Rhodes Jason P

Relationship: Director
Address: C/O DYNE THERAPEUTICS, INC., 830 WINTER ST., WALTHAM
Signature: /s/ Ommer Chohan, Attorney-in-Fact
Signature date: 08 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DYN transaction

Common Stock

Sale

Transaction value: $5,766,759
Shares: -253,039
Change %: -5.7%
Price: $22.79
Shares after: 4,223,448
Date: 06 Jul 2026
Ownership: See footnote
Footnotes: F1, F2, F3

DYN transaction

Common Stock

Sale

Transaction value: $2,898,478
Shares: -127,182
Change %: -9.5%
Price: $22.79
Shares after: 1,217,537
Date: 06 Jul 2026
Ownership: See footnote
Footnotes: F1, F2, F4

DYN transaction

Common Stock

Sale

Transaction value: $2,279,433
Shares: -100,019
Change %: -10%
Price: $22.79
Shares after: 875,912
Date: 06 Jul 2026
Ownership: See footnote
Footnotes: F1, F2, F5

DYN transaction

Common Stock

Sale

Transaction value: $2,881,861
Shares: -124,379
Change %: -2.9%
Price: $23.17
Shares after: 4,099,069
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F3, F6

DYN transaction

Common Stock

Sale

Transaction value: $698,845
Shares: -29,587
Change %: -0.72%
Price: $23.62
Shares after: 4,069,482
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F3, F7

DYN transaction

Common Stock

Sale

Transaction value: $1,449,121
Shares: -62,543
Change %: -5.1%
Price: $23.17
Shares after: 1,154,994
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F4, F6

DYN transaction

Common Stock

Sale

Transaction value: $350,615
Shares: -14,844
Change %: -1.3%
Price: $23.62
Shares after: 1,140,150
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F4, F7

DYN transaction

Common Stock

Sale

Transaction value: $1,139,802
Shares: -49,193
Change %: -5.6%
Price: $23.17
Shares after: 826,719
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F5, F6

DYN transaction

Common Stock

Sale

Transaction value: $275,527
Shares: -11,665
Change %: -1.4%
Price: $23.62
Shares after: 815,054
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F1, F5, F7

DYN transaction

Common Stock

Sale

Transaction value: $118,050
Shares: -5,000
Change %: -63%
Price: $23.61
Shares after: 2,962
Date: 07 Jul 2026
Ownership: See footnote
Footnotes: F8, F9

^* 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 9 footnotes

Footnote F1

Shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 19, 2026.

Footnote F2

The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $22.4163 to $23.25 inclusive. The Reporting Persons undertake 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 securities sold at each separate price within the ranges set forth in footnotes (2) and (6) through (8).

Footnote F3

The shares are held directly by Atlas Venture Fund XI, L.P. ("Atlas Venture Fund XI"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. ("AVA XI LP"). Atlas Venture Associates XI, LLC ("AVA XI LLC") is the general partner of AVA XI LP. The Reporting Person is a member of AVA XI LLC and disclaims Section 16 beneficial ownership of such securities held by Atlas Venture Fund XI, except to the extent of his pecuniary interest therein, if any.

Footnote F4

The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. ("AVOF II"). Atlas Venture Associates Opportunity II, LP ("AVAO II LP") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC ("AVAO II LLC") is the general partner of AVAO II LP. The Reporting Person is a member of AVAO II LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF II, except to the extent of his pecuniary interest therein, if any.

Footnote F5

The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF I"). The general partner of AVOF I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF I, except to the extent of his pecuniary interest therein, if any.

Footnote F6

The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $22.4572 to $23.4553 inclusive.

Footnote F7

The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $23.46 to $23.8628 inclusive.

Footnote F8

The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $23.50 to $23.794 inclusive.

Footnote F9

The shares are held directly by AVA XI LP. AVA XI LLC is the general partner of AVA XI LP. The Reporting Person is a member of AVA XI LLC and disclaims Section 16 beneficial ownership of the securities held by AVA XI LP, except to the extent of his pecuniary interest therein, if any.