0000872589 2021-11-04 2021-11-04 0000872589 false 8-K 2021-11-04 2021-11-04 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 $.001 per share REGN NASDAQ false