Vera Therapeutics, Inc., a clinical stage biotechnology company, focuses on developing and commercializing treatments for patients with serious immunological diseases. Its lead product candidate is atacicept, a fusion protein self-administered as a subcutaneous injection that is in Phase III clinical trial for patients with immunoglobulin A nephropathy; and for treatment of lupus nephritis that is in Phase II clinical trial. It is also developing MAU868, a human monoclonal antibody for the treatment of BK viremia infections. The company was formerly known as Trucode Gene Repair, Inc. and changed its name to Vera Therapeutics, Inc. in April 2020. Vera Therapeutics, Inc. was incorporated in 2016 and is headquartered in Brisbane, California.

aTyr Pharma, Inc., a biotherapeutics company, engages in the discovery and development of medicines based on novel immunological pathways in the United States. Its lead therapeutic candidate is efzofitimod, a selective modulator of NRP2 that is in Phase III clinical trial for pulmonary sarcoidosis; and in Phase 1b/2a clinical trial for treatment of other interstitial lung diseases (ILDs), such as chronic hypersensitivity pneumonitis and connective tissue disease related ILD. The company is developing ATYR0101, a fusion protein derived from a domain of aspartyl-tRNA synthetase that is in preclinical development for the treatment of fibrosis; and ATYR0750, a domain of alanyl-tRNA synthetase for the treatment of liver disorders. It has collaboration and license agreement with Kyorin Pharmaceutical Co., Ltd. for the development and commercialization of efzofitimod for ILDs in Japan. aTyr Pharma, Inc. was incorporated in 2005 and is headquartered in San Diego, California.

Acelyrin, Inc., a clinical biopharma company, focuses on identifying, acquiring, and accelerating the development and commercialization of transformative medicines. The company's lead product candidate is izokibep, a small protein therapeutic designed to inhibit IL-17A with high potency, which is in Phase 3 clinical trials for use in the treatment of Hidradenitis Suppurativa, Psoriatic Arthritis, and uveitis, as well as in Phase 2 clinical trials for use in the treatment of Axial Spondyloarthritis. It is also developing lonigutamab, a humanized immunoglobulin G1 (IgG1) monoclonal antibody which is in Phase 1 clinical trials for use in the treatment of thyroid eye disease. In addition, the company's develops SLRN-517, a fully human IgG1 monoclonal antibody targeting c-KIT, which is in preclinical stage for use in the treatment of chronic urticaria. Acelyrin, Inc. was incorporated in 2020 and is headquartered in Agoura Hills, California.

Kyverna Therapeutics, Inc., a clinical-stage biopharmaceutical company, focuses on developing cell therapies for patients suffering from autoimmune diseases. Its lead product candidate is KYV-101, an autologous CD19 CAR T-cell product candidate for the treatment of patients with lupus nephritis and systemic sclerosis that is in Phase I clinical trial; and for myasthenia gravis and multiple sclerosis that is in Phase II clinical trial. The company is also developing KYV-201, an allogeneic CD19 CAR T-cell product candidate that is in preclinical stage to treat multiple autoimmune diseases. In addition, it is developing product candidates to treat other autoimmune diseases, such as inflammatory bowel disease that includes Crohn's disease and ulcerative colitis. Kyverna Therapeutics, Inc. has a license and collaboration agreement with Intellia Therapeutics, Inc. to research and develop an allogeneic CD19-directed CAR cell therapy product; and with Kite to research and develop programs for the treatment, diagnosis, and prevention of autoimmune, inflammatory, and allogeneic stem cell transplant inflammatory diseases. The company was formerly known as BAIT Therapeutics, Inc. and changed its name to Kyverna Therapeutics, Inc. in October 2019. Kyverna Therapeutics, Inc. was incorporated in 2018 and is headquartered in Emeryville, California.

Climb Bio, Inc., a biotechnology company, focuses on developing therapies for autoimmune-driven inflammatory diseases. It develops budoprutug, an anti-CD19 monoclonal antibody for various autoimmune diseases, including systemic lupus erythematosus and lupus nephritis, immune thrombocytopenia, and membranous nephropathy. The company was formerly known as Eliem Therapeutics, Inc. and changed its name to Climb Bio, Inc. in October 2024. Climb Bio, Inc. was incorporated in 2018 and is headquartered in Wilmington, Delaware.

Cabaletta Bio, Inc., a clinical-stage biotechnology company, focuses on the discovery and development of engineered T cell therapies for patients with B cell-mediated autoimmune diseases. The company's lead product candidate is CABA-201, a fully human anti-CD19 binder for the treatment of Phase 1/2 clinical trials in dermatomyositis, anti-synthetase syndrome, immune-mediated necrotizing myopathy, lupus nephritis, non-renal systemic lupus erythematosus, systemic sclerosis, and generalized myasthenia gravis. It also develops DSG3-CAART, which is in Phase I/II clinical trial for the treatment of mucosal pemphigus vulgaris; and MuSK-CAART, an investigational cell therapy that is in Phase I/II clinical trial for treating patients with anti- muscle-specific kinase antibody positive myasthenia gravis. It has a collaboration with the University of Pennsylvania and the Children's Hospital of Philadelphia; Nanjing IASO Biotherapeutics Co., Ltd; Oxford Biomedica; and WuXi Advanced Therapies, Inc. The company was formerly known as Tycho Therapeutics, Inc. and changed its name to Cabaletta Bio, Inc. in August 2018. Cabaletta Bio, Inc. was incorporated in 2017 and is headquartered in Philadelphia, Pennsylvania.

IGM Biosciences, Inc., a clinical-stage biotechnology company, develops Immunoglobulin M (IgM) antibodies for the treatment of cancer and autoimmune and inflammatory diseases. It develops Aplitabart, a Death Receptor 5 Agonist IgM antibody for the treatment of colorectal cancer; imvotamab, a CD20 x CD3 bispecific IgM antibody to treat myositis, as well as for the treatment of systemic lupus erythematosus and rheumatoid arthritis that is Phase Ib clinical trial; and IGM-2644, a bispecific T cell engaging IgM antibody targeting CD38 and CD3 proteins for the treatment of autoimmune diseases. IGM Biosciences, Inc. has a collaboration and license agreement with Genzyme Corporation to generate, develop, manufacture, and commercialize IgM antibodies. The company was formerly known as Palingen, Inc. and changed its name to IGM Biosciences, Inc. in 2010. IGM Biosciences, Inc. was incorporated in 1993 and is headquartered in Mountain View, California.

Equillium, Inc., a clinical-stage biotechnology company, develops and sells products to treat severe autoimmune and inflammatory, or immuno-inflammatory disorders with unmet medical need. The company's lead product candidate is itolizumab (EQ001), a first-in-class monoclonal antibody that targets the immune checkpoint receptor CD6, which is in Phase III clinical trials for the treatment of acute graft-versus-host disease; completed Phase I clinical trial for the treatment of ulcerative colitis; and Phase I clinical trial for the treatment of lupus nephritis. It also develops EQ101 completed phase 1/2 for treatment of cutaneous T cell lymphoma and alopecia areata; and EQ302 to treat gastrointestinal indications. In addition, it serves dermatology, gastroenterology, rheumatology, hematology, transplant science, oncology, and pulmonology area. Equillium, Inc. has a research collaboration agreement with Vivtex Corporation to develop GI-targeted formulations for Bi-specific peptide therapy. The company was formerly known as Attenuate Biopharmaceuticals, Inc. and changed its name to Equillium, Inc. in May 2017. Equillium, Inc. was incorporated in 2017 and is headquartered in La Jolla, California.