Table of Contents TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 OR Washington, D.C. 20549 FORM 10-Q (781) 250-0111 Registrant's Telephone Number, Including Area Code For the transition period from ___________ to___________ Commission File Number 000-14656 REPLIGEN CORPORATION (Exac ...