Mealey's (July 12, 2019, 9:19 AM EDT) -- PITTSBURGH — Cambridge Retirement System (CRS) on June 25 filed a federal securities class action in Pennsylvania federal court against a hydraulic fracturing company and some of its executives, contending that they violated the Securities Exchange Act (SEA) and Securities Exchange Commission regulations (Cambridge Retirement System v. EQT Corporation, et al., No. 19-754, W.D. Pa.)....