Type segmentation distinguishes BiSpecific MAbS by molecular architecture, directly influencing development cost, manufacturing complexity, and market adoption. IgG-like formats, which retain a full Fc region, dominate the market because they leverage established IgG production platforms, offering longer half‑life and effector functions; they account for roughly 55% of total revenue. Fragment‑based constructs, such as BiTEs and DARTs, omit the Fc region, enabling smaller size and rapid tissue penetration, but require continuous infusion, representing about 25% of sales. Non‑IgG scaffolds—including engineered proteins and antibody fragments fused to alternative carriers—provide enhanced stability and reduced immunogenicity, contributing approximately 12% of the market value. Emerging multispecific platforms that bind three or more antigens are still niche, comprising the remaining 8%, yet they signal future diversification. This BiSpecific MAbS segmentation by type clarifies how each architectural class supports the overall market size through distinct value propositions and pipeline intensity.