Elon Musk has now sold more than half the stock he vowed on Twitter

Tesla shares have rebounded 9.4% after initially slumping following Musk's Twitter poll.

After a few days’ break, Elon Musk resumed selling shares in Tesla Inc., now coming more than halfway to making good on his promise to offload 10% of his stake in the electric-car maker.

The billionaire sold an additional 934,091 shares for $1.05 billion, according to regulatory filings late on Tuesday U.S. time. He also exercised 2.15 million stock options, and the sales were made to cover the taxes related to that transaction, the documents showed.

With the most recent disposals, Musk now has offloaded 9.2 million shares and collected about $9.9 billion of proceeds since he conducted a Twitter