Tesla Inc Chief Executive Officer Elon Musk has sold 19.5 million shares of the electric vehicle maker worth $3.95 billion, according to U.S. securities filings, days after he completed the $44 billion takeover of Twitter Inc. Musk, the world’s richest man, had about $20 billion in cash after selling a part of his stake in Tesla and would have required to raise an additional $2 billion to $3 billion to finance the Twitter deal.