SELECTA BIOSCI(SELB) - 2025 Q3 - Quarterly Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q þ 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 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware 26-1622110 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 7495 New Horizon Way, Frederick, MD 21703 (Address of principal executive of ...