0001680581 2023-01-17 2023-01-17 false 0001680581 8-K 2023-01-17 FULCRUM THERAPEUTICS, INC. DE 001-38978 47-4839948 26 Landsdowne Street Cambridge MA 02139 (617) 651-8851 false false false false Common Stock, $0.001 par value per share FULC NASDAQ true false