It's a combination. In some cases the companies just buy our companies, take the IP back, and use it in their own firms. In other cases they buy the companies, and then the people who created and developed that intellectual property leave as well, to further develop it elsewhere.
Evidence of meeting #39 for Industry, Science and Technology in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was universities.
A recording is available from Parliament.