According to a study conducted by the compensation, culture, and career monitoring website, Comparably, Costco has the best company culture in the large business category (more than 500 employees). Comparably Awards are based on sentiment ratings from employees who anonymously rated their employers on Comparably.com from November 26, 2017 to November 26, 2018. Comparably notes, "There were no fees or costs associated with participating, nor was nomination required.