November, Tesla Inc. board chair Robyn Denholm has been selling the company’s stock. During that time, shares whipsawed and the company’s sales slowed — and then cratered — around the world.As part of a pre-arranged plan around exercising equity options,

Robyn Denholm, who leads Tesla’s board, said on social media that board members were “highly confident” in Mr. Musk, the company’s chief executive.