 NEW YORK, May 18, 2021 PRNewswire -- Rowley Law PLLC is investigating potential securities law violations by Core-Mark Holding Company, Inc. NASDAQ: CORE and its board of directors concerning the proposed acquisition of the company by Performance Food Group Company PFG; NYSE: PFGC. Stockholders will receive 23.875 and 0.44 shares of PFG common stock for each share of Core-Mark Holding Company stock that they hold. 