UK quantum start-ups

69 UK quantum start-ups (also written startups): trading companies founded in 2015 or later, plus any marked as a start-up in the data. 62 have a recorded founding year, the earliest 2015. Most are in London (20), Cambridge (8) and Glasgow (8), and the commonest specialisms are quantum software (22), quantum hardware (18) and quantum photonics (16).

"Start-up" has no legal definition, so this page uses the founding year. 7 start-ups below have no recorded year. For every UK quantum company, including older firms, universities and funders, see UK quantum companies and organisations; for where they are, see quantum companies by city.