0001984086 2026-05-11 2026-05-11 false 0001984086 8-K 2026-05-11 Septerna, Inc. DE 001-42382 84-3891440 250 East Grand Avenue South San Francisco CA 94080 650 338-3533 Not Applicable false false false false Common Stock, par value $0.001 per share SEPN NASDAQ true false