https://www.reuters.com/article/us-tesla-musk/musk-mocks-hedge-fund-owner-einhorn-over-tesla-shorts-idUSKBN1XI1ZY

Tesla Inc Chief Executive Officer Elon Musk took to Twitter on Friday to taunt short-seller David Einhorn in an open letter after the hedge fund owner wrote to clients about losing money on his short position in the Silicon Valley car maker.