Tesla said two directors plan to leave its board in June and two more intend to depart next year as part of a move to improve corporate governance of the electric car company.

Brad Buss, a member of the board since 2009, and Linda Johnson Rice, who joined two years ago, have asked not to be re-elected when shareholders convene on June 11 for Tesla’s annual general meeting, the company said in a preliminary proxy statement.

Steve Jurvetson, who just returned from an extended leave of absence, will not seek re-election at the 2020 shareholders’ meeting, the proxy said; Antonio Gracias, a close associate of the chief executive, Elon Musk, intends to leave at the same time, a year before his term ends. Mr. Gracias’s early departure must be approved by shareholders at the June 11 meeting.