The Type dimension divides the Lysosomal Storage Disorders market into four therapeutic modalities: Enzyme Replacement Therapy (ERT), Substrate Reduction Therapy (SRT), Gene Therapy, and Small‑Molecule Therapy. ERT remains the largest contributor, accounting for roughly 45 % of revenue, because it directly supplements deficient enzymes and has multiple FDA‑approved products across Gaucher, Fabry, and Pompe diseases. SRT, which lowers the accumulation of pathogenic substrates, captures about 20 % of the market; its growth is driven by oral agents that expand patient accessibility. Gene‑therapy approaches, still early‑stage but with several clinical‑trial pipelines, represent approximately 15 % of the forecasted spend, reflecting high R&D intensity and premium pricing. Small‑Molecule Therapy, encompassing pharmacological chaperones and modulators, contributes the remaining 20 %, supported by oral formulations that target a broader patient pool. Together, these sub‑types shape the overall market size by allocating capital, R&D focus, and reimbursement streams across distinct development pathways.