Elon Musk sells more Tesla shares, but stock drops in early trading

Elon Musk (AP Photo/Susan Walsh, File)

Tesla chief Elon Musk has sold another chunk of his stock after pledging on Twitter to liquidate 10% of his holdings in the electric car maker.

He sold about 640,000 shares for roughly 687.3 million dollars (£512.7 million), according to two filings with the US Securities and Exchange Commission.