Things started with "IBM loves you, and pledges to stay hands off and help you do what you're already doing", continued to "We're going to replace a few management positions with folks from IBM" and "We're changing some benefits, titles, and procedures to better align with The IBM Way", and finally ended up with "You aren't meeting your sales targets, so we're going to overhaul your leadership."
Admittedly, this was a much smaller company than Red Hat. But they were profitable before being bought and had a respected product and growth.