Avidity Biosciences ABOUT | BOARD OF DIRECTORS DELIVERING ON OUR VISION Our vision is to profoundly improve people’s lives by revolutionizing the delivery of RNA therapeutics. We’re utilizing our proprietary AOC platform to design, engineer, and develop therapeutics that combine the tissue selectivity of monoclonal antibodies (mAbs) with the precision of oligonucleotide-based therapies in order to redefine RNA therapeutics and more effectively target underlying genetic drivers of diseases. We are delivering on this vision by investing in our platform, our pipeline and our people. Troy Wilson, PhD, JD Chairman and Co-Founder Carsten Boess Board Member Noreen Henig, M.D. Chief Medical Officer, Kezar Life Sciences Edward Kaye, M.D. Chief Executive Officer and Director, Stoke Therapeutics Jean Kim Board Member Eric Mosbrooker Chief Operations Officer, Cognoa Tamar Thompson VP, Govt. Affairs and Policy, Alexion Pharmaceuticals Sarah Boyce President & Chief Executive Officer © 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 Terms of Use Privacy Policy Patents

Avidity Biosciences INVESTORS | HISTORICAL STOCK PRICE 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 Select the date below to view the historical closing price for that particular day. The closing price is not indicative of future price performance. Historical Stock Prices are provided for informational purposes only and are not intended for trading purposes. NASDAQRNA Select A Date December 2021 Sun Mon Tue Wed Thu Fri Sat 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 Results for Thursday, December 2, 2021 $24.15 Closing Price 281,197 Volume $24.49 Day's High $22.45 Day's Low 1:1 Split Adjustment Jun 13 Nov 18 Nov 25 Dec 2 Dec 9 Dec 16 $10 $20 Currency in USD. Quote data delayed by at least 15 minutes. © 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