Tesla told investors in a new regulatory filing on Monday that “retaining Elon Musk is more important than ever,” signalling the board’s intention to secure the chief executive’s long-term commitment as the company scales its autonomous-driving, robotics and energy businesses. The electric-vehicle maker added that it does not expect to book additional compensation expense when issuing any future equity awards to Musk, indicating that the cost has already been accounted for under existing plans. The disclosure came as analysts continued to highlight Tesla’s competitive edge in artificial intelligence. Morgan Stanley’s Adam Jonas wrote that few U.S. companies are as well positioned as Tesla across data, robotics, energy and manufacturing, a view that helped the shares rebound after recent weakness tied to an Autopilot crash ruling reported by Barron’s.