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Harpoon Therapeutics, Inc., a clinical-stage immunotherapy company, engages in the development of a novel class of T cell engagers that harness the power of the body's immune system to treat patients suffering from cancer and other diseases in the United States. The company develops tri-specific T cell activating construct (TriTAC) product candidate, including HPN328, which is in Phase I/II clinical trials for the treatment of small cell lung cancer and other Delta-like canonical Notch ligand 3-expressing tumors; and HPN217 that is in Phase I clinical trials for the treatment of multiple myeloma. Its preclinical stage product is HPN601 for the treatment of multiple solid tumor indications. It has a discovery collaboration and license agreement with AbbVie Biotechnology Ltd. to develop and commercialize products that incorporate its proprietary TriTAC platform technology together with soluble T cell receptors. The company was incorporated in 2015 and is headquartered in South San Francisco, California. As of March 11, 2024, Harpoon Therapeutics, Inc. operates as a subsidiary of Merck Sharp & Dohme LLC.

SAB Biotherapeutics, Inc., a clinical-stage biopharmaceutical company, engages in the development of immunotherapies based on human antibodies. It has applied advanced genetic engineering and antibody science to develop transchromosomic bovine herds that produce fully human antibodies targeted at infectious diseases and immune and autoimmune disorders, including infectious diseases, influenza, CDI, type 1 diabetes, organ transplantation, and oncology, as well as immunology, gastroenterology, and respiratory diseases. The company also uses its DiversitAb immunotherapy platform to produce fully-human polyclonal antibodies without the need for human donors or plasma. In addition, its lead product candidates include SAB-185, a fully-human polyclonal antibody therapeutic candidate that is in Phase III clinical trial for the treatment of COVID-19; and SAB-176, a fully-human polyclonal antibody therapeutic candidate that is in development for the treatment or prevention of severe influenza. Further, the company's pre-clinical product candidates in development for autoimmune diseases include SAB-142 for type 1 diabetes and organ transplant induction/rejection. SAB Biotherapeutics, Inc. was founded in 2014 and is headquartered in Sioux Falls, South Dakota.

Surrozen, Inc., a clinical stage biotechnology company, discovers and develops drug candidates to selectively modulate the Wnt pathway for tissue repair and regeneration. The company is developing antibody-based therapeutics with application across various disease areas, including diseases of the intestine, liver, retina, cornea, lung, kidney, cochlea, skin, pancreas, and central nervous system. Its products in pipeline include SZN-043, a hepatocyte-specific R-spondin mimetic bispecific fusion protein, which is in Phase 1b clinical trial for the treatment of severe liver diseases, including alcoholic hepatitis and asialoglycoprotein receptor 1; and SZN-1326, a bi-specific antibody, which is in Phase 1b clinical trial for the treatment of moderate to severe inflammatory bowel disease, Frizzled, and LRP receptors. The company also develops SZN-413, a Fzd4 targeted bi-specific antibody, which is in preclinical stage for the treatment of retinal vascular associated diseases. Surrozen, Inc. has collaboration and license agreement with Boehringer Ingelheim International GmbH to research, develop, and commercialize Fzd4 bi-specific antibodies. Surrozen, Inc. was founded in 2015 and is based in South San Francisco, California.