These Terms of Service are a binding agreement between you and Dyne Therapeutics, Inc. (“Dyne”), and govern your access and use of the Site, which includes any information, data, tools, products, services and other content (together, “Content”) available on or through the Site.

PLEASE READ THESE TERMS OF SERVICE CAREFULLY BEFORE ENTERING THE SITE. EACH TIME YOU ENTER THE SITE, YOUR USE INDICATES YOUR FULL ACCEPTANCE OF AND AGREEMENT TO ABIDE BY THESE TERMS OF SERVICE IN THEIR THEN CURRENT FORM. IF YOU DO NOT ACCEPT THE TERMS AND CONDITIONS STATED IN THESE TERMS OF SERVICE, PLEASE EXIT THE SITE.

As we may revise these Terms of Service from time to time, you should review them periodically.

Dyne grants you a limited right to use the Site only for lawful informational and internal business purposes, and to print pages from the Site only in connection with that use. You may not modify, distribute, transmit, perform, reproduce, publish, license, create derivative works from, transfer or sell any Content, including any text, graphics, logos and other source-identifying symbols, designs, icons, images, or other information, software or code obtained from the Site. You are prohibited from removing any copyright, trademark or other proprietary notice or legend contained on (or printed from) the Site or on any printed pages. In addition, you are prohibited from decomposing, decompiling, reverse engineering, disassembling or otherwise deconstructing all or any portion of the Site.

Further, you shall not: (i) use the Site or any related services in violation of any applicable law, regulation, or third-party right; (ii) attempt to gain unauthorized access to the Site, its servers, networks, accounts, databases, or any related systems; (iii) introduce, transmit, or distribute any viruses, malware, malicious code, or other harmful technologies through or in connection with the Site; (iv) interfere with, disrupt, compromise, or circumvent the security, integrity, or operation of the Site or any related systems; or (v) submit, upload, provide, or otherwise transmit any false, inaccurate, misleading, deceptive, or fraudulent information.

Medical Advice Disclaimer

NO INFORMATION IN THIS SITE IS PROVIDED WITH THE INTENTION TO GIVE MEDICAL ADVICE OR INSTRUCTIONS ON THE ACCURATE USE OF DYNE PRODUCTS. DYNE CANNOT ANSWER UNSOLICITED E-MAILS REQUESTING PERSONAL MEDICAL ADVICE.

VISITORS SHOULD ALWAYS CONSULT A HEALTHCARE PROFESSIONAL PRIOR TO MAKING ANY DECISIONS, OR UNDERTAKING ANY ACTIONS OR NOT UNDERTAKING ANY ACTIONS RELATED TO ANY HEALTH CARE PROBLEM OR ISSUE YOU MIGHT HAVE AT ANY TIME, NOW OR IN THE FUTURE.

Privacy Policy

Dyne’s Privacy Policy is a part of these Terms of Service. Use of this Site indicates your consent to the collection and use of your Personal Data as set forth in the Privacy Policy.

Copyrights and Trademarks

The Site and the Content contain copyrighted materials, trademarks, and other proprietary materials that are owned by Dyne, its affiliates and/or third parties and are protected by intellectual property laws of the United States and other countries.

You should assume that all Content of the Site is copyrighted unless expressly stated otherwise and may not be used, copied, reproduced, downloaded, modified, published, distributed, transmitted, or exploited, in whole or in part, in any form or by any means, without the express written permission of Dyne or the original creator of the material, except as provided herein.

Product names, logos, trademarks, and service marks that are used or displayed on the Site (collectively, the “Trademarks”) are registered or unregistered trademarks and the exclusive property of Dyne, or its affiliates. No use of the Trademarks may be made without Dyne’s prior written authorization, except solely to identify Dyne’s products or services. Any other product names, logos, trademarks, and service marks appearing on the Site that are not owned by Dyne may not be used without express permission from their respective owners.

Nothing contained herein shall be construed as conferring by implication, estoppel, or otherwise any license or right, either express or implied, under any intellectual property of Dyne, or any third party.

User Responsibility; Limitations on Liability; Disclaimer of Warranties

Each person assumes full responsibility and all risks arising from use of the Site.

IN NO EVENT, INCLUDING BUT NOT LIMITED TO NEGLIGENCE, SHALL ANY OF DYNE, ITS AFFILIATES, AND THEIR RESPECTIVE OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, REPRESENTATIVES, DATA PROVIDERS, AND LICENSORS AND THEIR RESPECTIVE HEIRS AND ASSIGNS BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY DAMAGES OF ANY KIND OR NATURE, INCLUDING, BUT NOT LIMITED TO, DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, EXEMPLARY, SPECIAL (INCLUDING LOSS OF PROFIT), PUNITIVE, OR OTHER DAMAGES ARISING FROM OR IN CONNECTION WITH THE EXISTENCE OR USE OF THE SITE, REGARDLESS OF WHETHER DYNE, OR ANY OF THE OTHER ENTITIES OR PERSONS LISTED ABOVE HAS BEEN ADVISED AS TO THE POSSIBILITY OF SUCH DAMAGES. THIS INCLUDES DAMAGES TO, OR FOR VIRUSES THAT MAY INFECT YOUR COMPUTER EQUIPMENT.

IF YOU RELY ON THIS SITE OR ANY INFORMATION, PRODUCT OR SERVICE AVAILABLE THROUGH THIS SITE, YOU AGREE THAT YOU DO SO AT YOUR OWN RISK. THERE MAY BE DELAYS, OMISSIONS, INTERRUPTIONS, INACCURACIES, AND/OR OTHER PROBLEMS WITH THE INFORMATION, PRODUCTS, AND SERVICES PUBLISHED ON OR PROMOTED OVER THIS SITE.

WITHOUT LIMITING THE FOREGOING, EVERYTHING ON THE SITE IS PROVIDED TO YOU AS IS AND DYNE MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND OR NATURE WITH RESPECT TO THE SITE.

DYNE HEREBY DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES, WHETHER EXPRESS OR IMPLIED, CREATED BY LAW, CONTRACT OR OTHERWISE, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, OR NON-INFRINGEMENT.

DYNE MAKES NO REPRESENTATION OR WARRANTIES THAT ACCESS TO THE SITE WILL BE AVAILABLE ON A TIMELY BASIS, WILL BE UNINTERRUPTED, OR THAT THE DATA CONTAINED ON THE SITE WILL BE TIMELY OR ERROR FREE.

Please note that some jurisdictions may not allow the exclusion of implied warranties, so some of the above exclusions may not apply to you. Check your local laws for any restrictions or limitations regarding the exclusion of implied warranties. To the extent that Dyne may not, as a matter of applicable law, disclaim any implied warranty or limit its liabilities, the scope and duration of such warranty and the extent of Dyne’s liability will be equal to the minimum permitted under such applicable law.

Indemnification

YOU AGREE TO INDEMNIFY AND HOLD HARMLESS DYNE, ITS AFFILIATES, AGENTS, VENDORS AND LICENSORS, AND THEIR RESPECTIVE EMPLOYEES, OWNERS AND REPRESENTATIVES AGAINST ANY AND ALL CLAIMS, OF WHATEVER NATURE, THAT ARISE OUT OF ANY BREACH BY YOU OF THIS AGREEMENT OR YOUR USE OF THIS SITE, TO THE FULLEST EXTENT ALLOWED BY LAW.

You further agree that any claim related to this Site must be filed within one year after it arises.

Non-Personal Data

Any non-Personal Data that you transmit to, or post on, this Site by electronic mail or otherwise, including any data, questions, comments, suggestions, or the like, is, and will be treated as, non-confidential and nonproprietary data, and Dyne shall have no obligation of any kind with respect to such data. Dyne and any of its affiliates may use such data for any purpose whatsoever in accordance with applicable laws and regulations, including, but not limited to, the following purposes: reproduction, disclosure, transmission, publication, broadcast, and further posting. Further, we and any of our affiliates shall be free to use such data, including, but not limited to, any ideas, concepts, know-how, or techniques contained therein, for any purpose whatsoever, including, but not limited to, researching, developing, manufacturing, and marketing products incorporating such data. Please consult our Privacy Policy for more information.

Accessibility

Dyne is committed to making the Site accessible and usable for all individuals. Users who experience accessibility issues or require assistance accessing any content, feature, or functionality of the Site may contact Dyne at info@dyne-tx.com.

Links to Dyne’s Websites

Dyne encourages other websites to link to this Site, provided that such links do not state or imply any endorsement or sponsorship by Dyne and comply with these Terms of Service. Links to this Site from other sites should be text-only and may not use Dyne’s logo, trademarks or other intellectual property without Dyne’s prior written consent. Without Dyne’s prior written permission, you may not frame, scrape, mirror, or otherwise incorporate any portion of the Site or its content into another website or service. We strictly prohibit any suggestion that Dyne endorses, sponsors, recommends, or is affiliated with any company, product, service, website, or content that may link to Dyne’s websites without our prior written consent.

Links from Dyne’s Websites

This Site may include links to other sites. These links are provided solely for purposes of convenience. Unless the Site is owned and operated by Dyne, Dyne is not responsible for the content or accuracy of data contained on other sites or other sites’ privacy practices. Dyne is not liable for any damages or injury arising from content contained on other sites. Links to third-party sites are not a referral or endorsement of any other entity, item, or service. You release Dyne, and its affiliates from any damages that you may incur, and agree not to assert any claims against them, arising from your purchase or use of third-party supplied data, products and services.

Social Media

The X account, Facebook, LinkedIn and other social media pages for Dyne are designed to facilitate conversations about our business, core values, career opportunities and advances in healthcare. These pages are not to be used as a forum for discussing specific products (whether Dyne products or another company’s products).

We may not always be able to reshare or otherwise publicly respond to your posts, or publicly respond to your comments on our Facebook, LinkedIn or other social media pages. Although we monitor these accounts, we may not review or respond to comments, messages, mentions, tags, or other communications submitted through social media channels. We do want to connect with you – if you have questions or you need to reach us directly, our contact information can be found here: https://www.dyne-tx.com/about-us/#contact.

Dyne is not responsible for any posts or comments from third-parties, and posts or comments tagging Dyne or mentioning Dyne, its products or product candidates or its business or operations do not necessarily reflect our views. Dyne did not create and does not control the user-generated content posted by third-party organizations or individuals, including those in response to posts or status updates on Dyne’s LinkedIn or other social media pages. Dyne reserves the right, but assumes no obligation (unless required by law or regulation), to monitor, review, remove, edit or preserve content posted to its social media channels, and to block users, for reasons including, without limitation, making statements that are or contain information that is unlawful, non-compliant, confidential, offensive, misleading, factually inaccurate, infringes a copyright or other intellectual property rights, or that, in our sole discretion, we determine to be inappropriate or inconsistent with the purpose of the social media channel.

Dyne’s social media channels are not intended for the submission of personal health information, confidential information, adverse event reports, product complaints, medical inquiries, promotional materials, commercial solicitations, or other content that is unrelated to the purpose of the channel.

Jurisdiction

Nothing contained on the Site should be construed as solicitation or promotion for any product or for the use of any product in a way which is not authorized by the country in which the reader is physically located. This Site provides information about products or uses that may not be available in particular countries. Some of the products mentioned may in certain countries be approved or cleared by regulatory authorities for sale or use with different indications, dosages, and restrictions.

Governing Law

These Terms of Service shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflicts of laws principles. Any dispute arising out of or relating to these Terms of Service or the Site shall be brought exclusively in the state or federal courts located in Massachusetts, and each party irrevocably submits to the jurisdiction of such courts.

Forward-Looking Statements

This Site contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, contained in this Site, including statements regarding Dyne’s strategy, future operations, prospects and plans, objectives of management, the potential of the FORCE platform, the clinical and therapeutic potential of our product candidates, and expectations regarding the timing and outcome of interactions with regulatory authorities and the timing of regulatory authority action, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “objective,” “ongoing,” “plan,” “predict,” “project,” “potential,” “should,” “will” or “would,” or the negative of these terms, or other comparable terminology are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Dyne may not actually achieve the plans, intentions or expectations disclosed in these forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result of various important factors, including: uncertainties inherent in the identification and development of product candidates, including the initiation and completion of preclinical studies and clinical trials; uncertainties as to the availability and timing of results from preclinical studies and clinical trials; uncertainties as to the FDA’s and other regulatory authorities’ interpretation of the data from Dyne’s clinical trials and the regulatory approval process; whether Dyne’s cash resources will be sufficient to fund its foreseeable and unforeseeable operating expenses and capital expenditure requirements; as well as the risks and uncertainties identified in Dyne’s filings with the Securities and Exchange Commission (SEC), including the Company’s most recent Form 10-K or 10-Q and in subsequent filings Dyne may make with the SEC. In addition, the forward-looking statements included on this Site represent Dyne’s views as of August 26, 2026 (the “Effective Date”). Dyne anticipates that subsequent events and developments will cause its views to change. However, while Dyne may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Dyne’s views as of any date subsequent to the Effective Date. None of the information contained herein is intended to be, and shall not be deemed to be, incorporated into any of Dyne’s securities-related filings or documents.

Reservation of Rights

Dyne reserves the right to alter or delete material from this Site at any time without notice. Please check often for updates, as we reserve the right, in our sole discretion, to modify these Terms of Service at any time, and your use of the Site indicates your acceptance of any revisions to these terms.

These Terms of Service and any other terms and conditions of service on the Site constitute the entire agreement between you and Dyne and govern your use of the Site. Dyne’s failure to enforce any right or provision of these Terms of Service shall not constitute a waiver of such right or provision. If any provision of these Terms of Service is unlawful, void, or unenforceable, then it shall be severed and shall not affect the validity and enforceability of any Terms of Service. If any provision of these Terms of Service is held to be invalid or unenforceable in any jurisdiction, such provision shall be deemed modified to the minimum extent necessary so that such provision shall no longer be held to be invalid or unenforceable, and these Terms of Service shall be interpreted so as to achieve the intent expressed herein to the greatest extent possible in the jurisdiction in question. Any such modification, invalidity or unenforceability shall be strictly limited both to such provision and to such jurisdiction.

Dyne may assign its ownership, control, or other rights to any party at any time without any notice to you. Your rights and duties cannot be assigned without Dyne’s written consent. Nothing in these Terms of Service provides any third party with any remedy, claim, or cause of action.