Relentless film series

[OceanBlue]

A few years ago, I asked in the United Kingdom & Ireland sub-forum about the Relentless film series (they starred Leo Rossi, who I know best from being in the original Halloween II):

I've got a feeling they might be with Warner Brothers in the UK, after checking the films' IMDb company credits pages, but the Relentless series (four films in total), who currently owns UK rights to them? Was the first film released in cinemas and the three sequels went straight to video? I may have read about the first Relentless film before, but forgot about it until recently. Was reading the Mondo Digital review of an 80's trailer compilation US Blu-ray, and among the titles mentioned in the 1989 film trailers section was Relentless.

I received a reply from another poster at the time:

I think Sony have Relentless I & II, whilst III & IV are with Boulevard (in the US III & IV are with New Line/Warner).