Segmentation by Types classifies biosimilars according to their molecular architecture, each exerting distinct pressure on the market size. Monoclonal antibodies dominate, comprising roughly 55 % of biosimilar pipelines, because they represent the largest share of originator biologics and exhibit clear cost‑saving potential. Fusion proteins, which combine functional domains from separate proteins, account for about 15 % and include agents like etanercept biosimilars, where structural complexity moderates entry barriers. Cytokine‑based biosimilars (e.g., interferons, interleukins) represent 12 %, reflecting targeted uses in oncology and autoimmune disorders that generate steady, albeit smaller, volume. Enzyme replacement biosimilars occupy 8 %, driven by rare metabolic disorders where patient numbers are limited but pricing incentives remain high. The remaining 10 % covers emerging formats such as antibody‑drug conjugates and peptide‑based biosimilars, whose market impact is nascent but expected to expand as regulatory pathways mature. This taxonomy clarifies how molecular class influences development cost, pricing dynamics, and ultimately the overall Biosimilars market valuation.