They're not FAANG or JPMorgan, but he's not the CEO of Elon's Cheese Emporium on Main either. SpaceX has a market cap of $100B, Tesla $700B. That's bigger than any company I'm CEO of.
Actually, due to the downturn Netflix's market cap is only $125B, and Meta is $250B. So although they aren't all monstrously huge, I'd say Elon's companies are pretty big and require work to keep running.