 NEW YORK, Aug. 4, 2021 PRNewswire -- WeissLaw LLP is investigating possible breaches of fiduciary duty and other violations of law by the board of directors of HollyFrontier Corporation HollyFrontier or the Company NYSE: HFC in connection with the Companys proposed merger with Sinclair Oil Corporation and Sinclair Transportation Company Sinclair. Under the terms of the agreement, HollyFrontier will form a new parent company, named HF Sinclair Corporation HF Sinclair, which will replace HollyFrontier as the public company trading on the NYSE. 