Market Extra: Tesla joining the S&P 500 is going to be ‘the mother of all’ stock-market events

Wall Street will soon find out, as investors strap in for what could be a frenetic ride in equities thanks to electric-vehicle maker Tesla joining the benchmark U.S. index.

Wall Street will soon find out, as investors strap in for what could be a frenetic ride in equities thanks to electric-vehicle maker Tesla joining the benchmark U.S. index.