CSL Limited (OTCMKTS: CSLLY) is a global biotechnology company headquartered in Melbourne, Australia that develops, manufactures and delivers a range of plasma-derived and recombinant therapeutics, vaccines and related services. Its principal businesses include CSL Behring, which focuses on specialty biotherapies for bleeding disorders, immune deficiencies, hereditary angioedema and other serious conditions; Seqirus, an influenza vaccine company formed following CSL’s acquisition of Novartis’ influenza vaccine business; and CSL Plasma, a network of plasma collection centers that supplies the raw material for many of its therapies.
The company’s product portfolio spans immunoglobulins, clotting factor concentrates, albumin and other protein-based treatments used in the management of chronic and acute rare diseases, as well as seasonal and pandemic influenza vaccines. CSL invests in research and development to advance recombinant protein technologies, novel delivery formats and expanded indications for rare and serious conditions. Its integrated model—combining plasma collection, biologics manufacturing and global distribution—supports scale and supply reliability for clinically critical medicines.
Founded originally as Commonwealth Serum Laboratories, CSL has evolved from a national public health laboratory into a multinational biopharma enterprise with manufacturing, R&D and commercial operations across North America, Europe and the Asia–Pacific region. The company operates multiple manufacturing sites and maintains a broad global commercial footprint to serve hospital, specialist and public health customers worldwide.
CSL positions itself as a specialist provider to clinicians and public health agencies, emphasizing long-term investment in manufacturing capacity, plasma supply chains and scientific innovation. Its business model centers on continuity of supply for life‑sustaining therapies and vaccines, and on advancing treatments for rare and serious medical conditions through targeted research and strategic acquisitions.
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