X0306 4 2021-05-18 0 0001815442 Kymera Therapeutics, Inc. KYMR 0001628098 Atlas Venture Fund X, L.P. 300 TECHNOLOGY SQUARE, 8TH FLOOR CAMBRIDGE MA 02139 0 0 1 0 Common Stock 2021-05-18 4 J 0 1122619 0.00 D 5763012 D Represent a pro rata distribution, and not a purchase or sale of securities, by Atlas Venture Fund X, L.P. to its general partner and limited partners without additional consideration. This distribution was effected pursuant to a plan adopted in accordance with Rule 10b5-1 on November 17, 2020. Atlas Venture Fund X, L.P., By: Atlas Venture Associates X, L.P., its general partner, by Atlas Associates X, LLC, its general partner, By: Ommer Chohan, Chief Financial Officer /s/ Ommer Chohan 2021-05-18