This natural gas and oil producer, active in Ohio and Oklahoma, reported a significant insider sale in its latest SEC filing.Lester Zitkus, a senior vice president at Gulfport Energy Corporation (GPOR +0.17%), directly sold 4,745 shares in multiple open-market transactions on Jan. 7 for a total consideration of approximately $881,087.70, as disclosed in a recent SEC Form 4 filing.Transaction summaryMetricValueShares sold (direct)4,745Transaction value$881,087.70Post-transaction shares (direct)7,821Post-tran ...