HollyFrontier, a petroleum refiner headquartered in Dallas, and members of its board of directors were hit with a securities lawsuit Tuesday in New York Southern District Court over its proposed acquisition of Sinclair Oil Corporation for $1.8 billion. The lawsuit was brought by Weisslaw LLP on behalf of Shannon Jenkins. Counsel have not yet appeared for the defendants. The case is 1:21-cv-09497, Jenkins v. HollyFrontier Corporation et al.