Segmentation by types of phosphoramidites delineates the market into standard DNA phosphoramidites, RNA phosphoramidites, and modified nucleoside phosphoramidites. Standard DNA phosphoramidites (A, T, G, C) remain the baseline offering, supporting the bulk of oligonucleotide synthesis for both research and diagnostic kits; their widespread use sustains a stable revenue stream. RNA phosphoramidites (A, U, G, C) have gained prominence as RNA‑based therapeutics expand, contributing a growing proportion of sales despite higher manufacturing complexity. Modified nucleoside phosphoramidites—such as 2′‑O‑methyl, locked nucleic acids (LNA), and phosphorothioate analogues—address the need for enhanced stability, affinity, and nuclease resistance, commanding premium pricing and driving the high‑margin segment of the market. This market taxonomy clarifies how each type supports different end‑uses, influencing cost structures, production scaling, and ultimately the total addressable market for phosphoramidites.