Elon Musk said he could've sold his SpaceX shares to take Tesla private when he took the witness stand again to defend his 2018 "funding secured" tweets in a lawsuit filed by the automaker's shareholders. According to CNBC, Musk proclaimed: "SpaceX stock alone meant 'funding secured' by itself. It's not that I want to sell SpaceX stock but I could have, and if you look at the Twitter transaction — that is what I did. I sold Tesla stock to complete the Twitter transaction. And I would have done the same here." He didn't say how many of his shares he'd have to sell, however, to be able to fund the transaction.