Data on how many UK companies have a licence to supply firearms is not available. The Home Office publishes statistics on the number of firearm dealers that are registered with the police in England and Wales. The latest figures on the number of firearm dealers is available from table 6 of the ‘Firearm and Shotgun Certificates in England and Wales Statistics - Financial Year 2018/19’ publication.
Information on future Home Office statistical release dates can be found in the ‘Research and statistics calendar’.
Statistics on Firearm Certificates on issue in Scotland are published by Police Scotland.
The Police Service of Northern Ireland lists its statistical outputs on the Statistics page of its website, but there are no series that are directly comparable to those for England and Wales.