https://www.theguardian.com/technology/2018/aug/21/tesla-elon-musk-short-sellers-made-1bn

Musk tweeted on 7 August that he had ‘secured’ funding to take the company private, but so far no offer has been made

Investors betting on a fall in Tesla’s share price have made $1.09bn since 7 August, when Tesla founder Elon Musk tweeted he had “secured” funding to take the troubled company private.