Elon Musk sold an additional 5.2 million Tesla shares, about $4.5 billion, Thursday, at prices ranging between about $823 and $903 per share, according to new disclosure documents as he sought to secure funding for his massive acquisition deal. On the social networking company Twitter Twitter.

This brings his total stock sales this week to about 10 million shares, according to new disclosure documents issued by the US Securities and Exchange Commission.