What I want to know is why would he want to now "unhide" himself? To get a photo-op with Musk? Flex his bragging rights? Smart investor he might be, but ain't so smart otherwise. If I were him, I would have stayed anonymous.
Quote from the news article in the OP: Why does he get margin calls at all when he just buys long calls? Something is fishy with these reporter clerk idis, as usual... I think this guy rather short sells Puts, isn't it?
Man, this is not possible if he is a 5+% investor in any company, as he then must disclose his identity in mandatory public record filings to the SEC...
Yes, if your stake in the company is more than 5%. However, according to the linked article in the first post, his holding of TSLA wasn't even close (see below). Any yet he decided to come out and expose himself to everyone's scrutiny. Now he's definitely under the radar of IRS.