0000950170-24-002275.txt : 20240104 0000950170-24-002275.hdr.sgml : 20240104 20240104214535 ACCESSION NUMBER: 0000950170-24-002275 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20240104 DATE AS OF CHANGE: 20240104 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: Dyne Therapeutics, Inc. CENTRAL INDEX KEY: 0001818794 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences IRS NUMBER: 364883909 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-39509 FILM NUMBER: 24514336 BUSINESS ADDRESS: STREET 1: 1560 TRAPELO ROAD CITY: WALTHAM STATE: MA ZIP: 02451 BUSINESS PHONE: (781) 786-8230 MAIL ADDRESS: STREET 1: 1560 TRAPELO ROAD CITY: WALTHAM STATE: MA ZIP: 02451 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: Beskrovnaya Oxana CENTRAL INDEX KEY: 0001824542 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 144 MAIL ADDRESS: STREET 1: C/O DYNE THERAPEUTICS, INC. STREET 2: 830 WINTER STREET CITY: WALTHAM STATE: MA ZIP: 02451 144 1 primary_doc.xml 144 0001824542 XXXXXXXX LIVE 0001818794 Dyne Therapeutics, Inc. 001-39509 1560 Trapelo Road Waltham MA 02451 (781)-786-8230 Oxana Beskrovnaya Officer Common Stock Stifel Financial Corporation

3 Bryant Park, 4th Floor 1095 Avenue of the Americas New York NY 10036

42453 769702 61375598 01/04/2024 NASDAQ Common Stock 09/17/2021 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 3378 09/17/2021 Equity compensation Common Stock 03/10/2022 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 1589 03/10/2022 Equity compensation Common Stock 06/10/2022 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 1556 06/10/2022 Equity compensation Common Stock 09/10/2022 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 1570 09/10/2022 Equity compensation Common Stock 09/17/2022 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 3409 09/17/2022 Equity compensation Common Stock 12/10/2022 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 1602 12/10/2022 Equity compensation Common Stock 03/10/2023 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 3367 03/10/2023 Equity compensation Common Stock 06/10/2023 Shares acquired upon vesting of restricted stock units granted pursuant to issuer's 2020 stock incentive plan Issuer N 3308 06/10/2023 Equity compensation Common Stock 01/04/2024 Stock option exercise Issuer N 22674 01/04/2024 Cash N Oxana Beskrovnaya

1560 Trapelo Road Waltham MA 02451

Common Stock 12/11/2023 1467 15726 Oxana Beskrovnaya

1560 Trapelo Road Waltham MA 02451

Common Stock 01/03/2024 45326 860378 The sales reported in this Form 144 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 30, 2023. 01/04/2024 06/30/2023 /s/ Richard Scalzo, Attorney-in-Fact