144 0001683607 XXXXXXXX LIVE 0000872589 REGENERON PHARMACEUTICALS, INC. 000-19034 777 OLD SAW MILL RIVER ROAD TARRYTOWN NY 10591 9148477000 Bassler Bonnie L Director COMMON RBC WEALTH MANAGEMENT

250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401

610 530700.00 107128838 12/13/2023 NASDAQ COMMON 12/13/2023 STOCK OPTION EXERCISE ISSUER N 610 12/13/2023 N/A Y SOLD PURSUANT TO A RULE 10B5-1 PLAN ESTABLISHED 05/11/2023 12/13/2023 05/11/2023 JEFFREY EISCHENS