The Types segmentation categorizes CD20 monoclonal antibodies by molecular engineering: chimeric, humanized, fully human, and biosimilar variants. Chimeric antibodies (e.g., rituximab) combine murine variable regions with human constant domains, representing the legacy segment that still commands a sizable share due to established clinical pathways and extensive physician familiarity. Humanized antibodies (such as obinutuzumab) incorporate only the complementarity‑determining regions from mouse origins, offering improved safety profiles and higher affinity, which translates into a growing proportion of premium‑priced sales. Fully human antibodies (e.g., ofatumumab) are generated via transgenic platforms, minimizing immunogenicity and supporting niche adoption in patients intolerant to earlier generations. Finally, biosimilars replicate original biologics post‑patent expiry, rapidly eroding market share of originators by delivering cost‑effective alternatives, especially in price‑sensitive health systems. This market taxonomy clarifies how each type contributes to overall market size, with chimeric and humanized products still leading, while biosimilars accelerate competitive pressure.