BTR plc was a British multinational industrial conglomerate company headquartered in London, United Kingdom. It was founded in 1924, grew strongly by acquisition under Sir Owen Green's leadership, and merged with Siebe plc in 1999 to form BTR Siebe plc, later renamed Invensys. BTR was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index. Invensys was bought by and absorbed into Schneider Electric in 2014.