4D Molecular Therapeutics, Inc., a clinical-stage gene therapy company, develops product candidates using its adeno-associated viruses vectors.It develops a portfolio of gene therapy product candidates focuses in three therapeutic areas: ophthalmology, cardiology, and pulmonology. The company has three product candidates that are in clinical trials: 4D-125 that is in a Phase 1/2 clinical trial for the treatment of X-linked retinitis pigmentosa, choroideremia, and 4 D-310.