0000872589 2020-01-13 2020-01-13 8-K 2020-01-13 REGENERON PHARMACEUTICALS, INC. NY 000-19034 13-3444607 777 Old Saw Mill River Road Tarrytown NY 10591-6707 914 847-7000 false false false false Common Stock – par value $0.001 per share REGN NASDAQ false false 0000872589