CSL Limited is a global biopharmaceutical enterprise dedicated to the research, development, production, marketing, and distribution of a wide array of biopharmaceutical and related healthcare products. The company boasts a significant international presence, with operations spanning major markets such as Australia, the United States, Germany, the United Kingdom, Switzerland, and China, alongside other territories worldwide.

Its business is primarily structured around two key divisions: CSL Behring and Seqirus. The CSL Behring segment specializes in plasma-derived and recombinant therapies, which are crucial for treating serious medical conditions including immunodeficiency, various bleeding disorders, hereditary angioedema, Alpha-1 antitrypsin deficiency, and certain neurological ailments.

This division also conducts extensive research into both plasma and non-plasma-based treatments and generates income through licensing agreements and royalties from its proprietary innovations. In contrast, the Seqirus segment is focused on manufacturing and supplying biotherapeutic products that are not derived from plasma, with a particular emphasis on the development of solutions related to influenza.

CSL Limited, originally founded in 1916, has its corporate headquarters situated in Parkville, Australia.