2019 CEI Score: 100 Fortune 1000 position: 1 Where they're headquartered: Bentonville, Arkansas Industry: Retail2019 CEI Score: 100 Fortune 1000 position: 3 Where they're headquartered: Cupertino, California Industry: Tech2019 CEI Score: 100 Fortune 1000 position: 5 Where they're headquartered: San Francisco, California Industry: Healthcare2019 CEI Score: 100 Fortune 1000 position: 6 Where they're headquartered: Minnetonka, Minnesota Industry: Healthcare2019 CEI Score: 100 Fortune 1000 position: 8 Where they're headquartered: Detroit, Michigan Industry: Automotive2019 CEI Score: 100 Fortune 1000 position: 9 Where they're headquartered: Dallas, Texas Industry: Telecommunications2019 CEI Score: 100 Fortune 1000 position: 11 Where they're headquartered: Chesterbrook, Pennsylvania Industry: Pharmaceuticals2019 CEI Score: 100 Fortune 1000 position: 12 Where they're headquartered: Seattle, Washington Industry: E-commerce2019 CEI Score: 100 Fortune 1000 position: 15 Where they're headquartered: Dublin, Ohio Industry: Pharmaceuticals2019 CEI Score: 100 Fortune 1000 position: 17 Where they're headquartered: Deerfield, Illinois Industry: Retail2019 CEI Score: 100 Fortune 1000 position: 18 Where they're headquartered: Cincinnati, Ohio Industry: Retail2019 CEI Score: 100 Fortune 1000 position: 19 Where they're headquartered: San Ramon, California Industry: Oil and gas2019 CEI Score: 100 Fortune 1000 position: 20 Where they're headquartered: Washington, DC Industry: Financial services