DownstreamInvestorsShell sells US refinery to HollyFrontier Corp. for $350 millioneditorMay 5, 2021May 5, 2021 by editorMay 5, 2021May 5, 20210788 This week, Royal Dutch Shell plc announced it reached an agreement to sell its Puget Sound Refinery to HollyFrontier Corp. Accordingly, the purchase valued at $350 million,...