Re: That's settled then
Microsoft quite liked the tax deal where they sold software out of Ireland instead of the U.K. To reduce their tax by around £10m/year.
While HMRC should have stopped it (or tax rules changed to address the loophole), leaving the EU would potentially stop said loophole.
On the issue of immigration, the EU provides a huge pool of talent and the ability for a company to move between countries as required to get the most benefit for the company. Not so great for the workers unless they're prepared to move as well.
The EU - a socialist^h^h^h corporate dream.