X0508 4 2023-12-08 0 0000872589 REGENERON PHARMACEUTICALS, INC. REGN 0001663758 McCourt Marion 777 OLD SAW MILL RIVER ROAD TARRYTOWN NY 10591 0 1 0 0 EVP Commercial 1 Common Stock 2023-12-08 4 F 0 852 843.79 D 18951 D Common Stock 2023-12-08 4 A 0 2133 0.0 A 21084 D Common Stock 2023-12-11 4 S 0 270 838.44 D 20814 D Common Stock 2023-12-11 4 F 0 373 844.09 D 20441 D Common Stock 158 I By 401(k) Plan Non-Qualified Stock Option (right to buy) 843.79 2023-12-08 4 A 0 7649 0.0 A 2033-12-08 Common Stock 7649 7649 D Award of Restricted Stock under the Second Amended and Restated 2014 Long-Term Incentive Plan that vests 50% on December 8, 2025 and 50% on December 8, 2027. Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 16, 2023. The stock option award vests in four equal annual installments, commencing one year after the date of grant. /s/**Marion McCourt 2023-12-12