Amadeus invests venture capital in new technologies from offices in London and Cambridge, UK. Since its inception in 1997, Amadeus has backed 48 companies in the UK and continental Europe, covering computer hardware and software, mobile and fixed communications technologies and medical technologies. Investments include Cambridge Silicon Radio, producing single chip bluetooth radios for short range connections and floated on the London Stock Exchange in 2004, Optos, a manufacturer of laser retinal scanners and number one in 2003's Tech Track 100, Cambridge Broadband, developing technologies for wireless broadband networks in countries with poor infrastructure and number one in 2004's Tech Track 100, Valista, an electronic payments company, Solexa, developing ultra high speed gene sequencing machines and AePONA, a developer of standards-based software gateways for the telecoms industry. Successful realisations from the Amadeus portfolio include Entropic, bought by Microsoft and Element-14, bought by Broadcom Corporation.