It's clear these hedge funds are sticking to established players.Keeping tabs on what billionaire hedge fund managers do is a great way to check your investment strategy. While blindly following them isn't advisable, seeing what they're doing and checking that against your own thoughts is a good way of seeing if you're on the same page, especially when there's a hot trend like artificial intelligence (AI).The 13F filings for Q1 were recently released, revealing some common themes across hedge funds. While m ...