When investors talk about the stock market, they’re usually referencing an index such as the S&P 500. Every index is made up of a mix of different stocks, and carry different weightings. Over time, markets tend to rise because weaker companies in the index are replaced with stronger companies. Such rebalancings occur periodically, and investors who buy shares of companies going into a bigger index can often get in ahead of billions of dollars flowing into a stock. The Nasdaq 100 just announced three additions. Two are fast-moving tech plays, leavingAxon Enterprise (AXON) a surpri...
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