In a series of tweets for his 25 million followers accusing the US Securities and Exchange Commission earlier this week, Musk accused the regulator of not reading Tesla's annual reports and saying that the audit was "broken".
Last night he changed the display name and added an elephant tag.
Shares in the company were up nearly 5 percent at $ 312.15 in afternoon trading on Wednesday, after Musk said Tesla would have "news" at 2 in California on Thursday.
The company, which is deep in debt as it hits the production of its popular Model 3 sedan, is due to repay a $ 920 million convertible bond a day later.
Convertible issues give bondholders the right to trade their debt for equity after shares rise above a certain price. Tesla shares are currently around $ 48 during the conversion price of $ 359.87.
Tesla had NOK 3.7 billion in cash and cash equivalents at the end of December, according to the company's annual filing.
Last year, Musk promised to get his public statements made by the company's board, as part of a settlement with the SEC that led him to resign as Tesla CEO.
Tesla did not immediately respond to a request for comment.