Elon Musk sold about $1.02 billion worth of his holdings in Tesla, reaching closer to his sales target of 10 percent that he had promised Twitter followers last month, while at the same time bought millions of shares via options. According to filings with the U.S. Securities & Exchange Commission, as cited by the Wall Street Journal, Musk sold a total of 15.6 million shares. For offloading 10 percent, he’d need to dispose of almost 17 million shares. The world’s richest man based his pledge on a Twitter poll that voted “yes” to selling Tesla stock in retaliation to a government proposal to tax unrealized gains of billionaires in the country. Meanwhile, the Tesla chief exercised his right to buy the stock at a strike price of $6.24 per share, as granted to him through a compensation package back in 2012. The options trade got him shares that are currently …