Halma was listed on the London Stock Exchange in January 1972 and became a publicly-traded company. A series of acquisitions was made of mechanical, electrical and electronic engineering companies and successful management generated strong organic growth. This created the basis for the international manufacturing group that Halma is today. The company changed its name to Halma Limited in 1973 and registered as a public limited company in 1981, becoming Halma plc.

Halma has grown to be an established FTSE 250 business and currently comprises nearly 50 subsidiary companies operating worldwide. Today, Halma's technology centres on hazard detection, life protection, personal and public health improvement and environmental protection. Its markets are primarily the protection of human and capital assets, and the Group continues to grow through organic expansion and acquisition.