The BBC has been unable to verify the post was written by Mr Musk himself, but it has pushed the shares 6% higher. Much of that increase was driven by an earlier report that Saudi Arabia's sovereign wealth fund has bought $2 billion in Tesla stock, representing a 3-5% stake in the company.
A short squeeze is a trading scenario that occurs from time to time in heavily shorted stocks, when bearish traders are forced to buy shares to avoid big losses - something that ends up pushing the stock only higher. Musk owns almost 20pc of the company.
The news caused Tesla's share price to jump by $14.
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At a share price of $420, Electrek points out that taking Tesla private would be a costly decision, to the tune of some $70 billion.
Tesla spokespeople have not yet confirmed the proposal to any media outlets. "Funding secured." It isn't clear what prompted the tweet.
"Details, structure, participants and how the valuation has been determined remain to be seen".