Exmo is a cryptocurrency exchange based in the UK and is not regulated. Nor it needs to be, at least for the time being.
There is also another legal entity, mentioned on the site as a service provider: Finerta Business Inc., registered in the offshore zone of British Virgin Islands.
According to its own site, for the company work developers from Spain, Russia, India and Thailand, in partnership with financial advisors from Great Britain, USA, Lithuania and Singapore.
The company says it has 700 000 clients from all over the world and has several language options, including Chinese, but we get the impression that the exchange is mostly targeting clients from Russia and Ukraine – it accepts deposits in RUB and UAH and provides funding options mostly popular in these two countries. Besides, there are some sections of the site with Russian as default language. Not that there is something wrong with that, of course, but it seems that in January 2017 the Russian communications megaregulator Rosskomnadzor has blocked the access to the platform from Russia. Exmo has set up a mirror site for its Russian clients.
Judging by the user comments and reviews, Exmo is a fairly easy to use platform with decent reputation, although there are complaints that its servers are often down for maintenance.