Staffing providers Manpower Inc. (NYSE: MAN), Paychex Inc. (NASD: PAYX) and Fluor Corp. (NYSE: FLR) were named to the Ethisphere Institute’s 2015 world’s most ethical companies list. Manpower and Paychex were listed in the staffing and outsourcing category, marking the fifth consecutive year ManpowerGroup has earned the award and the seventh time Paychex has landed on the list.

Fluor, parent company of staffing provider TRS Staffing Solutions, garnered a spot in the engineering and design category.

Ethisphere is an international think-tank that promotes best practices in corporate ethics and compliance. The World’s Most Ethical Company assessment is based upon the Ethisphere Institute’s Ethics Quotient framework. Scores are generated in five key categories: ethics and compliance program; corporate citizenship and responsibility; culture of ethics; governance; and leadership, innovation and reputation.

For more on the list, click here.