95. Options Technology

Revenue: £45.1m (+19%)

Staff: 199

Backed by Abry Partners, this London-based Microsoft, VMware and Equinix partner provides cloud managed services to 550 hedge funds and other financial services firm. Calendar 2021 revenues leapt by nearly a fifth thanks to a combination of upsell to existing customers and a contract which transitioned to Options following its acquisition of peer Fixnetix in April of that year. It operates satellite offices in New York, Toronto, Chicago, Belfast, Hong Kong, Singapore and New Zealand.