Tesla appears poised to electrify S&P 500

Tesla Incappears on the verge of joining the S&P 500, a major accomplishment for Chief Executive Officer Elon Musk that would unleash a flood of new demand for the electric car maker's shares, which have already surged 500% over the past year.With a market capitalization of about $250 billion, Tesla would be among the most valuable companies ever added to the S&P 500, larger than 95% of the index's existing components.While analysts and investors have recently become more confident of Te