Yes there's a lot of firms that are actually in some senses UK companies from a tech perspective, but are owned by Americans. I used to work for one. All the engineering work was done out of the UK. The US focused on sales. Funnily enough, when we started working together I was getting drinks with the CEO and I mentioned I seemed to have spent my whole life working for Americans. He laughed and said he'd spent his whole life working for Brits (his background was finance).