2 - Act of 1934, as amended, and the rules and regulations thereunder (collectively, the “Exchange Act”). The Company has prepared a prospectus supplement specifically relating to the Placement Shares (the “Prospectus Supplement”) to the base...

Exhibit 10.2 AVIDITY BIOSCIENCES, INC. $400,000,000 COMMON STOCK SALES AGREEMENT August 9, 2024 TD Securities (USA) LLC 0 Xxxxxxxxxx Xxxxxx Xxx Xxxx, Xxx Xxxx 00000 Ladies and Gentlemen: Avidity Biosciences, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with TD Securities (USA) LLC (“XX Xxxxx”), as follows: 1. Issuance and Sale of Placement Shares. The Company agrees that, from time to time during the term of this Agreement, on the terms and subject to the conditions set forth herein, it may issue and sell through XX Xxxxx, acting as agent and/or principal, shares (the “Placement Shares”) of the Company’s common stock, par value $0.0001 per share (the “Common Stock”), having an aggregate offering price of up to $400,000,000 (the “Maximum Amount”). Notwithstanding anything to the contrary contained herein, the parties hereto agree that compliance with the limitation set forth in this Section 1 on the number of shares of Common Stock issued and sold under this Agreement shall be the sole responsibility of the Company, and XX Xxxxx shall have no obligation in connection with such compliance. The issuance and sale of the Placement Shares through XX Xxxxx will be effected pursuant to the Registration Statement (as defined below) filed by the Company which became automatically effective under Rule 462(e) of the Securities Act (as defined below) upon filing with the Securities and Exchange Commission (the “Commission”), although nothing in this Agreement shall be construed as requiring the Company to use the Registration Statement (as defined below) to issue the Placement Shares. The Registration Statement is an “automatic shelf registration statement” (as defined in Rule 405) and the Placement Shares (as defined below) have been and remain eligible for registration by the Company on such automatic shelf registration statement. The Company acknowledges and agrees that sales of Common Stock under this Agreement may be made through affiliates of XX Xxxxx and that XX Xxxxx may otherwise fulfill its obligations pursuant to this Agreement to or through an affiliated broker-dealer. For the avoidance of doubt, XX Xxxxx has a duty to fulfill all obligations under this Agreement. The Company has filed, in accordance with the provisions of the Securities Act of 1933, as amended, and the rules and regulations thereunder (collectively, the “Securities Act”), with the Commission an automatic registration statement on Form S-3 (File No. 333-279264), including a base prospectus, relating to certain securities, including the Common Stock, to be issued from time to time by the Company, and which incorporates by reference documents that the Company has filed or will file in accordance with the provisions of the Securities Exchange

- 12 - of any other person, and have not received written notice of any challenge, which is to their knowledge still pending, by any other person to the rights of the Company and its Subsidiaries with respect to any Intellectual Property Rights or Intellectual Property Assets owned or used by the Company or its Subsidiaries. To the Company’s knowledge, the Company and its Subsidiaries’ respective businesses as now conducted do not give rise to any infringement of, any misappropriation of, or other violation of, any valid and enforceable Intellectual Property Rights of any other person. All licenses for the use of the Intellectual Property Rights described in the Registration Statement and the Prospectus are valid, binding upon, and enforceable by or against the parties thereto in accordance to its terms. The Company has complied in all material respects with, and is not in breach nor has received any asserted or threatened claim of breach of any Intellectual Property license, and the Company has no knowledge of any breach or anticipated breach by any other person to any Intellectual Property license. Except as described in the Registration Statement or the Prospectus, no claim has been made against the Company alleging the infringement by the Company of any patent, trademark, service mark, trade name, copyright, trade secret, license in or other intellectual property right or franchise right of any person. The Company has taken all reasonable steps to protect, maintain and safeguard its Intellectual Property Rights, including the execution of appropriate nondisclosure and confidentiality agreements. The consummation of the transactions contemplated by this Agreement will not result in the loss or impairment of or payment of any additional amounts with respect to, nor require the consent of any other person in respect of, the Company’s right to own, use, or hold for use any of the Intellectual Property Rights as owned, used or held for use in the conduct of the business as currently conducted. With respect to the use of the software in the Company’s business as it is currently conducted, the Company has not experienced any material defects in such software including any material error or omission in the processing of any transactions other than defects which have been corrected, and to the Company’s knowledge, no such software contains any device or feature designed to disrupt, disable, or otherwise impair the functioning of any software or is subject to the terms of any “open source” or other similar license that provides for the source code of the software to be publicly distributed or dedicated to the public. To the Company’s knowledge, except as disclosed in the Registration Statement or the Prospectus, (i) all patents and patent applications have been properly filed and each issued patent is being diligently maintained; (ii) the Company has taken reasonable steps to obtain executed nondisclosure, confidentiality agreements and invention assignment agreements and invention assignments with its employees, (iii) no employee of the Company is in or has been in violation of any term of any employment contract, patent disclosure agreement, invention assignment agreement, non-competition agreement, non-solicitation agreement, nondisclosure agreement, or any restrictive covenant to or with a former employer where the basis of such violation relates to such employee’s employment with the Company; (iv) the duty of candor and good faith as required by the United States Patent and Trademark Office during the prosecution of the United States patents and patent applications included in the Intellectual Property Rights have been complied with, and in all foreign offices having similar requirements, all such requirements have been complied with; (v) there are no third parties who have rights to any Intellectual Property Rights owned by the Company, except for non-exclusive out-licenses to such Intellectual Property granted in the ordinary course of business; and (vi) there is no infringement by third parties of any Intellectual Property Rights owned or licensed to the Company; in each case that would reasonably be expected, singly or in the aggregate, to have a Material Adverse Effect.

- 21 - in connection with the (i) issuance, grant or sale of Common Stock, options to purchase shares of Common Stock or Common Stock issuable upon the exercise of options or other equity awards pursuant to any stock option, stock bonus or other stock plan or arrangement described in the Prospectus, (ii) adopt a new equity incentive plan, and file a registration statement on Form S-8 under the Securities Act to register the offer and sale of securities to be issued pursuant to such new equity incentive plan, and issue securities pursuant to such new equity incentive plan (including, without limitation, the issuance of shares of Common Stock upon the exercise of options or other securities issued pursuant to such new equity incentive plan), provided that such new equity incentive plan satisfies the transaction requirements of General Instruction A.1 of Form S-8 under the Securities Act, (iii) issue shares of Common Stock in connection with a licensing agreement, joint venture, acquisition or business combination or other collaboration or strategic transaction (including the filing of a registration statement on Form S-4 or other appropriate form with respect thereto), provided that the sum of the aggregate number of shares of Common Stock so issued shall not exceed 5% of the total outstanding shares of Common Stock outstanding immediately following the completion of such issuance, (iv) the issuance or sale of Common Stock pursuant to any dividend reinvestment plan that the Company may adopt from time to time provided the implementation of such is disclosed to XX Xxxxx in advance or (v) the issuance of any shares of Common Stock issuable upon the exchange, conversion or redemption of securities or the exercise of warrants, options or other rights in effect or outstanding. (j) Change of Circumstances. The Company will, at any time during a fiscal quarter in which the Company intends to tender a Placement Notice or sell Placement Shares, advise XX Xxxxx promptly after it shall have received notice or obtained knowledge thereof, of any information or fact that would alter or affect in any material respect any opinion, certificate, letter or other document provided to XX Xxxxx pursuant to this Agreement. (k) Due Diligence Cooperation. The Company will cooperate with any reasonable due diligence review conducted by XX Xxxxx or its agents in connection with the transactions contemplated hereby, including, without limitation, providing information and making available documents and senior corporate officers, during regular business hours and at the Company’s principal offices, as XX Xxxxx may reasonably request. (l) Required Filings Relating to Placement of Placement Shares. The Company agrees that on such dates as the Securities Act shall require, the Company will (i) file a prospectus supplement with the Commission under the applicable paragraph of Rule 424(b) under the Securities Act and (ii) deliver such number of copies of each such prospectus supplement to each exchange or market on which such sales were effected as may be required by the rules or regulations of such exchange or market. The Company shall disclose in its quarterly reports on Form 10-Q and in its annual report on Form 10-K, the number of the Placement Shares sold through XX Xxxxx under this Agreement, the gross proceeds to the Company from the sale of the Placement Shares and the average price of the Placement Shares sold pursuant to this Agreement during the relevant quarter or, in the case of an Annual Report on Form 10-K, during the fiscal year covered by such Annual Report and the fourth quarter of such fiscal year. (m) Bring-Down Dates; Certificate. On or prior to the First Delivery Date and each time (i) the Company files the Prospectus relating to the Placement Shares or amends or

- 22 - supplements the Registration Statement or the Prospectus relating to the Placement Shares (other than a prospectus supplement filed in accordance with Section 7(l) of this Agreement) by means of a post-effective amendment, sticker, or supplement but not by means of incorporation of document(s) by reference to the Registration Statement or the Prospectus relating to the Placement Shares; (ii) the Company files an annual report on Form 10-K under the Exchange Act; (iii) the Company files its quarterly reports on Form 10-Q under the Exchange Act; or (iv) the Company files a report on Form 8-K containing amended financial information (other than an earnings release) under the Exchange Act (each date of filing of one or more of the documents referred to in clauses (i) through (iv) shall be a “Bring-Down Date”); the Company shall furnish XX Xxxxx with a certificate, in the form attached hereto as Exhibit 7(m) within one (1) Trading Day of any Bring-Down Date if requested by XX Xxxxx. The requirement to provide a certificate under this Section 7(m) shall be waived for any Bring-Down Date occurring at a time at which no Placement Notice is pending, which waiver shall continue until the earlier to occur of the date the Company delivers a Placement Notice hereunder (which for such calendar quarter shall be considered a Bring-Down Date) and the next occurring Bring-Down Date. Notwithstanding the foregoing, if the Company subsequently decides to sell Placement Shares following a Bring-Down Date when the Company relied on such waiver and did not provide XX Xxxxx with a certificate under this Section 7(m), then before the Company delivers the Placement Notice or XX Xxxxx sells any Placement Shares, the Company shall provide XX Xxxxx with a certificate, in the form attached hereto as Exhibit 7(m), dated the date of the Placement Notice. (n) Legal Opinion. On or prior to the First Delivery Date and within one (1) Trading Day of each Bring-Down Date with respect to which the Company is obligated to deliver a certificate in the form attached hereto as Exhibit 7(m) for which no waiver is applicable, the Company shall cause to be furnished to XX Xxxxx a written opinion of Xxxxxx & Xxxxxxx, LLP (“Company Counsel”), or other counsel satisfactory to XX Xxxxx, in form and substance satisfactory to XX Xxxxx and its counsel, dated the date that the opinion is required to be delivered, modified, as necessary, to relate to the Registration Statement and the Prospectus as then amended or supplemented; provided, however, that in lieu of such opinions for subsequent Bring-Down Dates, counsel may furnish XX Xxxxx with a letter (a “Reliance Letter”) to the effect that XX Xxxxx may rely on a prior opinion delivered under this Section 7(n) to the same extent as if it were dated the date of such letter (except that statements in such prior opinion shall be deemed to relate to the Registration Statement and the Prospectus as amended or supplemented at such Bring-Down Date). (o) Comfort Letter. On or prior to the First Delivery Date and within one (1) Trading Day of each Bring-Down Date with respect to which the Company is obligated to deliver a certificate in the form attached hereto as Exhibit 7(m) for which no waiver is applicable, the Company shall cause its independent accountants to furnish XX Xxxxx letters (the “Comfort Letters”), dated the date the Comfort Letter is delivered, in form and substance satisfactory to XX Xxxxx, (i) confirming that they are an independent registered public accounting firm within the meaning of the Securities Act and the PCAOB, (ii) stating, as of such date, the conclusions and findings of such firm with respect to the financial information and other matters ordinarily covered by accountants’ “comfort letters” to XX Xxxxx in connection with registered public offerings (the first such letter, the “Initial Comfort Letter”) and (iii) updating the Initial Comfort Letter with any information that would have been included in the Initial Comfort Letter

- 30 - Xxxxx’x obligations hereunder is not fulfilled, or (iv) any suspension or limitation of trading in the Placement Shares or in securities generally on Nasdaq shall have occurred. Any such termination shall be without liability of any party to any other party except that the provisions of Section 7(g) (Expenses), Section 9 (Indemnification and Contribution), Section 10 (Representations and Agreements to Survive Delivery), Section 16 (Applicable Law; Consent to Jurisdiction) and Section 17 (Waiver of Jury Trial) hereof shall remain in full force and effect notwithstanding such termination. If XX Xxxxx elects to terminate this Agreement as provided in this Section 11(a), XX Xxxxx shall provide the required notice as specified in Section 12 (Notices). (b) The Company shall have the right, by giving ten (10) days’ notice as hereinafter specified to terminate this Agreement in its sole discretion at any time after the date of this Agreement. Any such termination shall be without liability of any party to any other party except that the provisions of Section 7(g), Section 9, Section 10, Section 16 and Section 17 hereof shall remain in full force and effect notwithstanding such termination. (c) XX Xxxxx shall have the right, by giving ten (10) days’ notice as hereinafter specified to terminate this Agreement in its sole discretion at any time after the date of this Agreement. Any such termination shall be without liability of any party to any other party except that the provisions of Section 7(g), Section 9, Section 10, Section 16 and Section 17 hereof shall remain in full force and effect notwithstanding such termination. (d) Unless earlier terminated pursuant to this Section 11, this Agreement shall automatically terminate upon the issuance and sale of all of the Placement Shares through XX Xxxxx on the terms and subject to the conditions set forth herein; provided that the provisions of Section 7(g), Section 9, Section 10, Section 16 and Section 17 hereof shall remain in full force and effect notwithstanding such termination. (e) This Agreement shall remain in full force and effect unless terminated pursuant to Sections 11(a), (b), (c), or (d) above or otherwise by mutual agreement of the parties; provided, however, that any such termination by mutual agreement shall in all cases be deemed to provide that Section 7(g), Section 9, Section 10, Section 16 and Section 17 shall remain in full force and effect. (f) Any termination of this Agreement shall be effective on the date specified in such notice of termination; provided, however, that such termination shall not be effective until the close of business on the date of receipt of such notice by XX Xxxxx or the Company, as the case may be. If such termination shall occur prior to the Settlement Date for any sale of Placement Shares, such Placement Shares shall settle in accordance with the provisions of this Agreement. 12. Notices. All notices or other communications required or permitted to be given by any party to any other party pursuant to the terms of this Agreement shall be in writing, unless otherwise specified in this Agreement, and if sent to XX Xxxxx, shall be delivered to XX Xxxxx at TD Securities (USA) LLC, 0 Xxxxxxxxxx Xxxxxx, Xxx Xxxx, XX 00000, fax no. 646-562- 1130, Attention: General Counsel, email: XXXXxxxx@xxxxxxxxxxxx.xxx, with a copy to Xxxxxx LLP, e-mail: xxxxxxxxx@xxxxxx.xxx, attention: Xxxxxx X. Xxxxxxxx; or if sent to the Company, shall be delivered to Avidity Biosciences, Inc., 00000 Xxxxxxx Xxxxxx Xxxxx, Xxxxx 000, Xxx

- 31 - Diego, California, 92121 Attention: Chief Legal Officer, email: xxxx.xxxxxxxx@xxxxxxxxxx.xxx, with a copy to Xxxxxx & Xxxxxxx LLP, attention: Xxxxxxx X. Xxxx, email: xxxx.xxxx@xx.xxx. Each party to this Agreement may change such address for notices by sending to the parties to this Agreement written notice of a new address for such purpose. Each such notice or other communication shall be deemed given (i) when delivered personally or by verifiable facsimile transmission (with an original to follow) on or before 4:30 p.m., New York City time, on a Business Day (as defined below), or, if such day is not a Business Day on the next succeeding Business Day, (ii) on the next Business Day after timely delivery to a nationally-recognized overnight courier and (iii) on the Business Day actually received if deposited in the U.S. mail (certified or registered mail, return receipt requested, postage prepaid). For purposes of this Agreement, “Business Day” shall mean any day on which the Nasdaq and commercial banks in the City of New York are open for business. 13. Successors and Assigns. This Agreement shall inure to the benefit of and be binding upon the Company and XX Xxxxx and their respective successors and the affiliates, controlling persons, officers and directors referred to in Section 9 hereof. References to any of the parties contained in this Agreement shall be deemed to include the successors and permitted assigns of such party. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and permitted assigns any rights, remedies, obligations or liabilities under or by reason of this Agreement, except as expressly provided in this Agreement. Neither party may assign its rights or obligations under this Agreement without the prior written consent of the other party; provided, however, that XX Xxxxx may assign its rights and obligations hereunder to an affiliate of XX Xxxxx without obtaining the Company’s consent. 14. Adjustments for Share Splits. The parties acknowledge and agree that all share- related numbers contained in this Agreement shall be adjusted to take into account any share split, share dividend or similar event effected with respect to the Common Stock. 15. Entire Agreement; Amendment; Severability. This Agreement (including all schedules and exhibits attached hereto and Placement Notices issued pursuant hereto) constitutes the entire agreement and supersedes all other prior and contemporaneous agreements and undertakings, both written and oral, among the parties hereto with regard to the subject matter hereof. Neither this Agreement nor any term hereof may be amended except pursuant to a written instrument executed by the Company and XX Xxxxx. In the event that any one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable as written by a court of competent jurisdiction, then such provision shall be given full force and effect to the fullest possible extent that it is valid, legal and enforceable, and the remainder of the terms and provisions herein shall be construed as if such invalid, illegal or unenforceable term or provision was not contained herein, but only to the extent that giving effect to such provision and the remainder of the terms and provisions hereof shall be in accordance with the intent of the parties as reflected in this Agreement. 16. Applicable Law; Consent to Jurisdiction. This Agreement shall be governed by, and construed in accordance with, the internal laws of the State of New York without regard to the principles of conflicts of laws. Each party hereby irrevocably submits to the non-exclusive jurisdiction of the state and federal courts sitting in the City of New York, borough of Manhattan,

34 If the foregoing correctly sets forth the understanding between the Company and XX Xxxxx, please so indicate in the space provided below for that purpose, whereupon this letter shall constitute a binding agreement between the Company and XX Xxxxx. Very truly yours, TD SECURITIES (USA) LLC By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Managing Director ACCEPTED as of the date first-above written: AVIDITY BIOSCIENCES, INC. By: /s/ Xxxxxxx X. XxxXxxx Name: Xxxxxxx X. XxxXxxx Title: Chief Financial and Chief Business Officer Acknowledged and agreed to with respect to Section 21 hereof, as of the date first-above written: XXXXX AND COMPANY, LLC By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Managing Director

SCHEDULE 1 FORM OF PLACEMENT NOTICE From: [ ] Cc: [ ] To: [ ] Subject: XX Xxxxx At the Market Offering—Placement Notice Gentlemen: Pursuant to the terms and subject to the conditions contained in the Sales Agreement between Avidity Biosciences, Inc., a Delaware corporation (the “Company”), and TD Securities (USA) LLC (“XX Xxxxx”) dated August 9, 2024 (the “Agreement”), I hereby request on behalf of the Company that XX Xxxxx sell up to [ ] shares of the Company’s common stock, par value $0.0001 per share, at a minimum market price of $_______ per share. Sales should begin on the date of this Notice and shall continue until [DATE] [all shares are sold].

SCHEDULE 2 Notice Parties Company Xxxxx Xxxxx President and Chief Executive Officer Xxxxxxx XxxXxxx Chief Financial and Chief Business Officer With a copy to: Xxxx Xxxxxxxx, Xx. Chief Legal Officer and Corporate Secretary Xxxx Xxxxxxxx Vice President, Finance XX Xxxxx Xxxxxxx X. Xxxxxx Managing Director Xxxxxxx Xxxxxx Managing Director Xxxxxxx Xxxxxxx Director Xxxxx Xxxxxxx Analyst

SCHEDULE 3 Compensation XX Xxxxx shall be paid compensation up to 3.0% of the gross proceeds from the sales of Placement Shares pursuant to the terms of this Agreement.

Exhibit 7(m) OFFICER CERTIFICATE The undersigned, the duly qualified and elected _______________________, of Avidity Biosciences, Inc. (“Company”), a Delaware corporation, does hereby certify in such capacity and on behalf of the Company, pursuant to Section 7(m) of the Sales Agreement dated August 9, 2024 (the “Sales Agreement”) between the Company and TD Securities (USA) LLC, that to the best of the knowledge of the undersigned. (i) The representations and warranties of the Company in Section 6 of the Sales Agreement (A) to the extent such representations and warranties are subject to qualifications and exceptions contained therein relating to materiality or Material Adverse Effect, are true and correct on and as of the date hereof with the same force and effect as if expressly made on and as of the date hereof, except for those representations and warranties that speak solely as of a specific date and which were true and correct as of such date, and (B) to the extent such representations and warranties are not subject to any qualifications or exceptions, are true and correct in all material respects as of the date hereof as if made on and as of the date hereof with the same force and effect as if expressly made on and as of the date hereof except for those representations and warranties that speak solely as of a specific date and which were true and correct as of such date; and (ii) The Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied pursuant to the Sales Agreement at or prior to the date hereof. Xxxxxx LLP and Xxxxxx & Xxxxxxx LLP are entitled to rely upon this Certificate in connection with the opinions given by such firms pursuant to the Sales Agreement. Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Sales Agreement. By: Name: Title: Date: