 Another selloff in Tesla Inc.s stock TSLA, -1.76 on Tuesday, toward a more than two-year low, could drop the electric vehicle maker down to 13th on the list of most valuable SP 500 SPX, 0.59 companies. The electric vehicle makers stock slumped 3.3 toward a seventh-straight loss in premarket trading, with recent trading prices implying a market capitalization of about 375.96 billion, down from 388.88 billion as of Fridays close. 