0001650648 2026-03-25 2026-03-25 false 0001650648 8-K 2026-03-25 4D Molecular Therapeutics, Inc. DE 001-39782 47-3506994 5858 Horton Street #455 Emeryville CA 94608 (510) 505-2680 N/A false false false false Common Stock, $0.0001 par value per share FDMT NASDAQ false