The type segmentation of the PEG-modified Drugs market distinguishes four primary sub‑categories: PEGylated proteins, PEGylated peptides, PEGylated small molecules, and PEGylated nucleic acids. PEGylated proteins, such as interferon‑α and growth factors, dominate the market by leveraging extended half‑life and reduced immunogenicity, accounting for roughly 40 % of total revenue. PEGylated peptides, exemplified by liraglutide, contribute about 25 % as they combine enhanced stability with improved patient compliance. PEGylated small molecules, though fewer in number, capture approximately 20 % of sales by enabling controlled release and solubility improvements for otherwise challenging chemistries. Finally, PEGylated nucleic acids—including siRNA and antisense oligonucleotides—represent a growing niche, currently responsible for near 15 % of market size, driven by advances in delivery platforms. Together, these type categories define the structural foundation of the PEG-modified Drugs market, each adding distinct value propositions that collectively shape overall market dynamics.