Investors in Delek US Holdings, Inc. (NYSE: DK) need to pay close attention to the stock based on moves in the options market lately. That is because the Jul 19, 2024 $15 Call had some of the highest implied volatility of all equity options today. What is Implied Volatility? Implied volatility shows how much movement the market is expecting in the future. Options with high levels of implied volatility suggest that investors in the underlying stocks are expecting a big move in one direction or the other. It could also mean ...