Elon Musk's younger brother and Tesla board member, Kimbal Musk, sold 30,000 shares worth $25.6 million in the electric car maker earlier this week, according to a regulatory filing. The transaction reduced Kimbal's holding in Tesla to 599,740 shares, which amounts to $483 million. Tesla shares soared 743% in 2020 and have jumped 14% so far this year.