Why is Tesla stock gaining 5% today?

Tesla stock TSLA rose around 5% on Monday after Barclays upgraded the electric vehicle maker, citing a potential merger with SpaceX and improving prospects for its automotive, energy storage, and autonomous driving businesses. Barclays analyst Dan Levy upgraded Tesla to Overweight from Equal Weight and raised his price target to $450 from $370, implying nearly 19% upside from recent levels.