0001984086 2026-04-13 2026-04-13 false 0001984086 8-K 2026-04-13 Septerna, Inc. DE 001-42382 84-3891440 250 East Grand Avenue South San Francisco CA 94080 650 338-3533 false false false false Common Stock, par value $0.001 per share SEPN NASDAQ true false