Application-based Large Molecule Injectable Drugs segmentation reveals a market dominated by oncology, which commands roughly 42 % of 2023 global sales. Monoclonal antibodies such as pembrolizumab and trastuzumab drive this share by addressing unmet need in solid tumours, while haematologic malignancies increasingly rely on bispecific antibodies. Auto-immune indications, primarily RA, psoriasis and IBD, contribute 28 %; here, TNF-α and IL inhibitors are migrating from hospital to home administration, expanding volume. Endocrine & metabolic disorders—insulins, GLP-1 analogues, growth hormone—account for 18 %; payer pressure is shifting demand toward biosimilar basal insulins, compressing value growth. Infectious disease applications (e.g., RSV, HIV monoclonals) and orphan enzyme-replacement therapies together supply the residual 12 %, with the latter posting double-digit CAGR because of ultra-high annual cost per patient.