Segmentation by type classifies the Rare Neurodegenerative Disease Treatment market into four technology families, each shaping the pipeline composition and competitive landscape. Small‑molecule drugs dominate with the broadest chemical diversity, enabling oral administration and relatively rapid development cycles; they contribute the largest share of approved products and generate steady revenue streams. Biologics, principally monoclonal antibodies and recombinant proteins, address extracellular targets and account for a growing proportion of late‑stage trials, reflecting higher development costs but premium pricing. Gene‑therapy platforms—viral vectors and genome‑editing approaches—aim to correct pathogenic mutations at the DNA level, representing a high‑risk, high‑reward segment with a modest but accelerating market share. RNA‑based therapies, including antisense oligonucleotides and siRNA, modulate gene expression post‑transcriptionally and have recently achieved regulatory milestones, positioning them as a fast‑growing niche. Collectively, these types determine R&D allocation, manufacturing complexity, and pricing strategies, thereby influencing total market valuation.