Why Hawaiian Electric Industries Stock Was Soaring Today

The utility was enjoying a double-digit gain, but not because of any proprietary news.Hawaiian Electric Industries (HE +10.80%) was providing plenty of financial juice to its shareholders on Monday. Following news that the utility stock is set to be included in a key equity index, market players rushed to buy it, driving the price up by 11% in mid-afternoon trading.Graduation dayJust after market close last Friday, S&P Global Indices -- the company behind such closely followed stock market gauges as the S&P ...