Shares of fintech firm Fidelity National Information Services Inc (NYSE:FIS) are trading at their highest level since February 2023 following a post-earnings gap higher on the charts. The equity also reclaimed support from its 50-day moving average after earnings, though the $76 level kept a lid on further gains. However, a "buy" signal is flashing that could keep the wind at the stock's back.  Specifically, FIS' Schaeffer's Volatility Index (SVI) of 22% is higher than just 4% of the other readings from the ...