Segmentation by type differentiates biosimilars according to their molecular architecture, which influences development complexity, regulatory pathways, and pricing dynamics. Monoclonal antibodies dominate the type landscape, capturing the bulk of revenue because they represent the majority of high‑volume biologics transitioning to biosimilar status. Fusion proteins occupy a secondary tier, offering engineered constructs that combine functional domains and are gaining traction in oncology and autoimmune disorders. Peptide hormones such as biosimilar erythropoietin and growth hormone form a niche but steady segment, driven by chronic disease management and sizable patient pools. Enzyme therapeutics remain the smallest category, limited by a narrower pipeline and higher manufacturing costs, yet they present growth potential as more enzyme‑based biologics lose patent protection. By isolating these molecular categories, analysts can assess investment risk and forecast revenue streams, reinforcing the precision of Biosimilars Drug segmentation within market taxonomy frameworks.