The latest stock sale comes as analysts had also widely expected Musk to sell additional Tesla shares. Tesla has lost nearly half its market value and Musk's net worth slumped by $70 billion ever since he bid for Twitter in April. Musk pledged to provide $46.5 billion in equity and debt financing for the acquisition, which covered the $44 billion price tag and the closing costs. Banks, including Morgan Stanley (MS.N) and Bank of America Corp (BAC.N), committed to provide $13 billion in debt financing. Tesla and Twitter did not immediately respond to Reuters' requests for comment.

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