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Freeline Therapeutics Holdings plc, a clinical-stage biotechnology company, develops transformative adeno-associated virus (AAV) vector-mediated gene therapies. It develops FLT180a for the treatment of hemophilia B.; FLT201 for the treatment of Type 1 Gaucher disease; and FLT190 for the treatment of Fabry disease. in addition, it has research programs for systemic gene therapy. The company was founded in 2015 and is headquartered in Stevenage, the United Kingdom.

Proteon Therapeutics, Inc., a late-stage biopharmaceutical company, focuses on the development of pharmaceuticals to address the needs of patients with renal and vascular disease. Its lead product candidate is vonapanitase, an investigational drug intended to enhance hemodialysis vascular access outcomes. The company develops vonapanitase, a recombinant human elastase, which has completed Phase II and Phase III clinical trials for patients with chronic kidney disease. It is also evaluating vonapanitase in a Phase I clinical trial in patients with peripheral artery disease. The company was founded in 2001 and is based in Waltham, Massachusetts.

Rubius Therapeutics, Inc., a biopharmaceutical company, focuses on the development of red cell therapeutics for the treatment of cancer and autoimmune diseases. The company was formerly known as VL26, Inc and as changed its name to Rubius Therapeutics, Inc. in 2015. Rubius Therapeutics, Inc. was incorporated in 2013 and is based in Foxborough, Massachusetts.

Sutro Biopharma, Inc. operates as a clinical-stage oncology company. The company develops site-specific and novel-format antibody drug conjugates (ADCs) that enables its proprietary integrated cell-free protein synthesis platform, XpressCF and XpressCF+. Its product candidates include STRO-002, an ADC directed against folate receptor-alpha, which is in Phase II/III clinical trials for patients with ovarian and endometrial cancers; VAX-24 and Vax-31 pneumococcal conjugate vaccine candidates that is in Phase II/III clinical trials for the treatment of invasive pneumococcal disease; and MK-1484, a distinct cytokine derivative molecule that is in Phase I clinical study for the treatment of cancer. The company's pre-clinical product candidates include STRO-003, an ADC directed against an anti-receptor tyrosine kinase-like orphan receptor 1 (ROR1) for the treatment of solid tumors and hematological cancers; and STRO-004, a tissue factor (TF) targeting ADC for the treatment of TF-expressing solid tumors, including cervical, lung, and breast cancer. Sutro Biopharma, Inc. has collaboration and license agreements with Merck Sharp & Dohme Corporation to develop research programs focusing on cytokine derivatives for cancer and autoimmune disorders; Vaxcyte to discover and develop vaccine candidates for the treatment or prophylaxis of infectious diseases; Tasly Biopharmaceuticals Co., Ltd. to develop and commercialize STRO-002 in Greater China; EMD Serono to develop ADCs for multiple cancer targets; and Astellas Pharma Inc. to develop immunostimulatory ADC. The company was formerly known as Fundamental Applied Biology, Inc. Sutro Biopharma, Inc. was incorporated in 2003 and is headquartered in South San Francisco, California.

Voyager Therapeutics, Inc., a biotechnology company, focuses on the treatment of gene therapy and neurology diseases. The company's lead clinical candidate is VY-TAU01, an anti-tau antibody program for the treatment of alzheimer's disease. Its product pipeline includes superoxide dismutase 1 silencing gene therapy, which is in preclinical trial for the treatment of amyotrophic lateral sclerosis; tau silencing gene therapy, which is in preclinical trial for the treatment of alzheimer's disease; and vectorized anti-amyloid antibody, a gene therapy targeting anti-amyloid for the treatment of alzheimer's disease and is in preclinical trial. In addition, the company develops VY-FXN01, which is in preclinical trial to treat friedreich's ataxia; and GBA1 gene replacement to treat parkinson's disease and is in preclinical trial. Further, it provides research program for the treatment of Huntington's disease. The company has collaboration and license agreements with Alexion; AstraZeneca Rare Disease; Novartis Pharma AG; Neurocrine Biosciences, Inc; and Sangamo Therapeutics, Inc. Voyager Therapeutics, Inc. was incorporated in 2013 and is headquartered in Lexington, Massachusetts.