Superior Tank Lines
Petroleum & Petroleum Products Wholesalers; Specialized Freight Trucking
Superior Tank Lines Holding Company is proud to be a 100% employee-owned company built on the combined legacies of two longstanding leaders in petroleum transportation.
Our story brings together two companies that each spent decades building strong reputations in the industry. Founded in 1989, Superior Tank Lines grew through its commitment to safe, reliable fuel transportation throughout the West Coast and became employee-owned in 2020. That legacy is joined by Williams Tank Lines, founded by Mike and Marlys Williams in 1976, which grew from a small family business into one of the region’s largest petroleum carriers, serving hundreds of customers throughout the Western United States.
Following the merger of Superior Tank Lines and Williams Tank Lines, our employees now share in one unified Employee Stock Ownership Plan (ESOP) and a much broader organization. Together, our operations span California, Oregon, Washington, Arizona, and Nevada, with a network of locations and a fleet serving customers from the Canadian border to the Mexican border. Across that footprint, our teams provide around-the-clock transportation of gasoline, diesel, ethanol, and other bulk petroleum products for customers ranging from independent operators to major oil companies.
While our company has grown in size and reach, the values that built both organizations remain at its foundation. Decades of experience, strong customer relationships, and a tradition of safety, service, and dependability now come together to support our customers, employee owners, key partners, and the future of our business.
As employee owners, we all have a stake in the success we create together. The work we do every day helps build long-term value for all of us. Moving forward means staying focused, working collaboratively, and continually looking for ways to be better tomorrow than we are today.
Two legacies. One team.
Superior Tank Lines is an employee-owned company headquartered in Colton, California.
Superior Tank Lines is an employee-owned company.
While they are not certified, based on Department of Labor 5500 fillings and other third-party data sources, we believe their ESOP meets our standards of significant and broad-based employee ownership.
While they are not certified, based third-party data sources, we believe their Worker Cooperative meets our standards of significant and broad-based employee ownership.
While they are not certified, based third-party data sources, we believe their Employee Ownership Trust meets our standards of significant and broad-based employee ownership.
While they are not certified, we believe they meet our standards of significant and broad-based employee ownership.