 Shares of Tesla Inc. TSLA, 0.59 rose 0.3 in afternoon trading Thursday, after SP Global Ratings raised the electric vehicle EV makers credit rating by two notches into investment grade territory, given higher-than-expected deliveries and a ramp up in production to meet strong demand. The rating was raised to BBB, which is the second-lowest investment grade rating, from BB, which was the highest speculative grade, or junk, rating. 