Exhibit 99.1 Press Release Regeneron Reports Second Quarter 2026 Financial and Operating Results Tarrytown, New York (July 30, 2026) -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) today announced financial results for the second quarter of 2026 and provided a business update. "Regeneron delivered another quarter of strong financial performance, with double-digit top- and bottom-line growth reflecting the continued strength of our commercial portfolio and the potential of our pipeline," said Leonard S. Sc ...