The refiner announced alignment with its activist investor as refining margins continued to increase.Shares of U.S. oil and chemical refiner and midstream giant Phillps 66 (PSX 0.04%) rallied 14.6% in March, according to data from S&P Global Market Intelligence.Not only did Phillips 66 benefit from an increasingly favorable pricing environment for refiners, but the company's CEO also said in an interview its new strategy earned the approval of the company's high-profile activist investor.Elliott signs off a ...