0001453687 2021-09-20 2021-09-20 0001453687 false 8-K 2021-09-20 SELECTA BIOSCIENCES, INC. DE 001-37798 26-1622110 65 Grove Street, Watertown, MA 02472 617 923-1400 false false false false Common Stock, $0.0001 par value per share SELB NASDAQ true true