Tronc Inc. shares surged Thursday following a report that identified the private-equity group considering an acquisition of the media company. Tronc shares touched an intraday high of $18.65, and were last up 5.7% at $17.58. On Thursday, Reuters reported that investment firm Donerail Group had secured financing for the deal and was in advanced negotiations with Tronc. On Wednesday, Tronc shares closed up 12% on reports of interest from a then-unnamed private-equity firm.