Halma plc is a British global group of safety equipment companies that makes products for hazard detection and life protection based in Amersham, England.

[3] It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.

[4] During the early 1950s the company's rubber estates were nationalised by the Sri Lankan government, and in 1956 the company became Halma Investments Limited, thereby severing its connections with both tea and rubber and becoming an investment and industrial holding company.

[4] In the early 1970s the company began a sequence of acquisitions in the mechanical, electrical and electronic engineering sectors.

[5] The company undertook three acquisitions in the second half of 2019, including Ampac, another fire detection business, and two further acquisitions in the medical sector in early 2020.