Passage Bio, Inc. operates as a genetic medicines company. The company is headquartered in Philadelphia, Pennsylvania and currently employs 24 full-time employees. The company went IPO on 2020-02-28. Its lead clinical product candidate, PBFT02, seeks to elevate progranulin levels to enhance lysosomal function and slow disease progression across a variety of neurodegenerative diseases. PBFT02 utilizes an adeno-associated virus serotype 1, or AAV1, capsid to deliver a functional granulin gene, encoding progranulin (PGRN), to the brain via intra cisterna magna (ICM) administration. Its development programs consist of PBFT02 for the treatment of FTD-GRN, PBFT02 for the treatment of FTD-C9orf72 and amyotrophic lateral sclerosis, and PBFT02 for the treatment of Alzheimer’s disease. Its clinical product candidates include PBGM01, PBKR03 and PBML04. The company also has a preclinical research program that explores multiple potential treatment targets for Huntington's disease.