Billionaire Elon Musk sold nearly $2 billion in Tesla Inc. stock on Thursday and Friday for $6.9 billion total on the week, which happened to be the worst for Tesla stock in more than a year.

Filings with the Securities and Exchange Commission made public Friday showed Musk sold more than 600,000 Tesla TSLA shares on Thursday, and exactly 1.2 million in Friday’s trading session, taking in a combined total of nearly $2 billion. The sales follow disclosures earlier this week that the electric vehicle car maker’s chief executive…