Avidity Biosciences INVESTORS | FAQS ABOUT AVIDITY Our mission is to profoundly improve people’s lives by delivering a new class of RNA therapeutics – AOCs. Our proprietary AOCs are designed to combine the specificity of monoclonal antibodies with the precision of oligonucleotide therapies to target the root cause of diseases previously untreatable with RNA therapeutics. Our advancing and expanding pipeline includes multiple skeletal muscle programs. We are also broadening the reach of AOCs beyond muscle tissues through both internal discovery efforts and key partnerships as the company continues to deliver on the RNA revolution. Learn More Where is Avidity Biosciences’ corporate headquarters? Avidity Biosciences is headquartered at 10975 N. Torrey Pines Rd. Suite 150 La Jolla, CA 92037, US. The main phone number is 858-401-7900. When was the company founded? When did Avidity Biosciences go public? When is Avidity Biosciences’ fiscal year-end? How is Avidity Biosciences’ stock traded? Who is Avidity Biosciences’ transfer agent? Who are Avidity Biosciences’ independent auditors? Who is Avidity Biosciences’ legal counsel? © 2021 Avidity Biosciences EXPLORE About Platform Pipeline Patients Investors Contact Careers CONTACT 10578 Science Center Dr. Suite 125 San Diego, CA 92121 info@aviditybio.com Tel: 858-401-7900 FOLLOW LEGAL Patents

Avidity Biosciences INVESTORS | COMMITTEE COMPOSITION ABOUT AVIDITY Our mission is to profoundly improve people’s lives by delivering a new class of RNA therapeutics – AOCs. Our proprietary AOCs are designed to combine the specificity of monoclonal antibodies with the precision of oligonucleotide therapies to target the root cause of diseases previously untreatable with RNA therapeutics. Our advancing and expanding pipeline includes multiple skeletal muscle programs. We are also broadening the reach of AOCs beyond muscle tissues through both internal discovery efforts and key partnerships as the company continues to deliver on the RNA revolution. Learn More Avidity Biosciences has the committees listed below in place. The grid below provides an overview of the individuals that make up each committee. To learn more about a particular committee or an individual member click the titles below. Audit Committee Compensation Committee Nominating and Corporate Governance Committee Carsten Boess Sarah Boyce Noreen Henig, M.D. Edward Kaye, M.D. Jean Kim Eric Mosbrooker Tamar Thompson Troy Wilson, PhD, JD Chair Member © 2021 Avidity Biosciences EXPLORE About Platform Pipeline Patients Investors Contact Careers CONTACT 10578 Science Center Dr. Suite 125 San Diego, CA 92121 info@aviditybio.com Tel: 858-401-7900 FOLLOW LEGAL Patents