ST Pharm Co., Ltd. (237690.KQ) is a South Korea-based contract development and manufacturing organization (CDMO) that provides custom manufacturing services for active pharmaceutical ingredients (APIs) and intermediates, specializing in oligonucleotides, RNA-based therapeutics, and small molecule APIs for pharmaceutical and biotech companies worldwide; its core offerings include small molecule and generic APIs such as those for viral infections, MRI contrast agents, tuberculosis, and anti-infectives; oligonucleotide-based products encompassing siRNA/microRNA, antisense oligonucleotides, aptamers, decoys, and novel oligos; monomers from nucleosides to phosphoramidites; mRNA for vaccines and therapeutics with proprietary technologies like SmartCap capping platform and STLNP lipid nanoparticles; and pre-clinical bioanalytical R&D solutions through subsidiary AnaPath Research & Service. The company operates cGMP manufacturing, quality control, and R&D facilities at its Banwol campus in Ansan-si, Gyeonggi-do, with headquarters in Siheung-si, Gyeonggi-do, and a Seoul office handling marketing, sales, and regulatory affairs, alongside global locations in Switzerland, Spain, and the United States. Founded in 1983 as Samchully Pharmaceutical Company Ltd., ST Pharm rebranded to focus on advanced gene therapy CDMO capabilities, supporting over 40 global projects with capacities of 6.4 mole for oligo and 1.0 kg/year for mRNA; recent developments include a January 2025 partnership with Evonik to integrate customized nucleic acids with lipid nanoparticle services for faster nucleic acid therapeutic development, completion of Phase 2a patient enrollment for antiviral candidate STP0404 (Pirmitegravir) in May 2025, publication of next-generation mRNA vaccine research in May 2025, trademark registration for SmartCap and STLNP platforms in March 2025, release of its first sustainability report in June 2025, and participation in TIDES USA 2025 to expand in the North American RNA market.