GSK is buying biopharmaceutical company Aiolos Bio for up to $1.4 billion in a deal that expands its respiratory pipeline and follows a string of pharmaceutical majors buying fast-growing biotechs to restock their pipelines.

The British pharmaceutical giant said Tuesday that the deal to buy San Francisco and London-based Aiolos Bio, which focuses on patients with respiratory and inflammatory conditions, includes a Phase 2-ready antibody called AIO-001 for the treatment of adult patients with certain respiratory and inflammatory conditions.