S&P Dow Jones Indices, which oversees the index, rebalances it on a quarterly basis, but its components can shift more frequently, spokesman Ray McConville said by phone on Friday."The index committee can make a change to the index at any time," he said.
"Tesla not getting into the S&P 500 will be a head scratcher to the bulls that viewed this as virtually a lock given all the parameters met," he wrote.
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