Tesla Motors Inc.

Tesla shares hit a 52-week high on Monday, and edged closer to an all-time high, as the company prepares to announce earnings and takes further steps to develop its eagerly awaited Model 3 sedan.

Shares rose 4 percent Monday, at one point trading as high as $280.67, its loftiest level over the past year. At that price, the stock was less than 4 percent away from its all-time high of $291.42, set in Sept. 14.