Best fortune-500 companies in Missouri

Ameren Corporation is an American power company created December 31, 1997 by the merger of St. Louis, Missouri's Union Electric Company and the neighboring Central Illinois Public Service Company of Springfield, Illinois. It is now a holding company for several power companies and energy companies.

Olin Corporation is a Virginia Corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. They are a manufacturer concentrated in three business segments: Chlor Alkali Products, Chemical Distribution and Winchester. They have been involved in the U.S. chlor alkali industry for more than 100 years and are the 4th largest producer in the North American chlor alkali market. Chlor Alkali Products manufactures chlorine and caustic soda, hydrochloric acid, hydrogen, potassium hydroxide and bleach products. Chemical Distribution manufacturers bleach products and distributes caustic soda, bleach products, potassium hydroxide and hydrochloric acid. Winchester is in its 148th year of operation and its 84th year as part of Olin. Winchester products include sporting ammunition, reloading components, small caliber military ammunition and components, and industrial cartridges.

Reinsurance Group of America, Incorporated is a leader in the global life reinsurance industry with approximately $2.9 trillion of life reinsurance in force and assets of $39.7 billion. they are one of the largest life reinsurance companies in the world. They are the only global reinsurance company to focus primarily on life and health-related reinsurance solutions. Their core products and services include individual life reinsurance, individual living benefits reinsurance, group reinsurance, health reinsurance, financial solutions, facultative underwriting and product development. In 2013, they reviewed more than 580,000 facultative applications, more than any other life reinsurer in the world.

Graybar, a Fortune 500 company, specializes in supply chain management services and is a leading North American distributor of high-quality components, equipment and materials for a number of industries. With $6 billion in revenue (2014), Graybar employs thousands of men and women at more than 260 North American distribution centers. As one of North America's largest employee-owned companies, Graybar has the power and stability of a big company coupled with the integrity and drive of a neighborhood business. Founded in 1869, Graybar procures, warehouses, and delivers tens of thousands of electrical supplies, communications and data products, components and related services to its customers. Graybar stocks and sells hundreds of thousands of items from thousands of manufacturers. Graybar serves customers in the construction market, the commercial, institutional and government (CIG) market, and the industrial and utility markets, with products and services that support new construction, infrastructure updates, building renovation, facility maintenance, repair and operations, and original equipment manufacturing. Through its distribution network and value-added services, including kitting and integrated solutions, Graybar is helping its customers to power and network their facilities with speed, intelligence and efficiency. By adding sophisticated logistics and project management to its operations, Graybar has become a vital link in America's supply chain.

Centene Corporation is at the forefront of providing quality health access for individuals across the United States, including those who are under-insured and uninsured. As a leading multi-national healthcare enterprise, Centene is dedicated to transforming the health of communities we serve by providing local services for the families and individuals in our care. In 1984, Centene Corporation was founded as Family Hospital Physician Associates, a nonprofit health plan in Milwaukee, WI, by Elizabeth “Betty” Brinn. As the company grew, Michael Neidorff joined as Centene's President and Chief Executive Officer in 1996, helping to establish the new name and move its headquarters in St. Louis, MO. By the early 2000s, Centene's positive impact on healthcare spurred additional health plans, significant growth in revenue, and its transformation into a publicly traded company. After joining the FORTUNE 500 list in 2010, Centene continued to expand by launching operations in correctional healthcare, commercial insurance, and coverage for the military community, while acquiring large companies like Health Net and WellCare. As the #1 U.S. insurer in the Health Insurance Marketplace, Centene has never lost its focus on individual care or its passion toward community health. The company currently provides coverage across the United States and internationally in Spain, Slovakia, and the UK. With local health plans all over the U.S., staying connected with those individuals and families that need care most is central to Centene's unwavering commitment to quality healthcare for everyone.

Edward Jones Ltd is UK subsidiary of the company that dedicates to serving the needs of individual investors. The company leads in the financial-services industry, but we take a personal approach to business, an approach that starts with a face-to-face meeting between a financial advisor and client. Edward Jones opened its first office in the U.K. in 1997. The company said it now has more than 300 offices there, with about 1,000 total U.K. staff and 50,000 clients. As of November 12, 2009, Edward Jones Ltd. operates as a subsidiary of Towry Law.

Emerson is where technology and engineering come together to create solutions for the benefit of our customers, driven without compromise for a world in action.

O'Reilly Automotive is a retailer of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States. Its product line includes re-manufactured automotive hard parts, accessories, and a complete line of auto body paint and related materials, automotive tools, and professional service equipment. O'Reilly Automotive was started in 1957 and is based in Springfield, Missouri.

Express Scripts operates as a pharmacy benefit management company in the United States and Canada. Its PBM segment offers clinical solutions; and specialized pharmacy care, home delivery and specialty pharmacy, retail network pharmacy administration, benefit design consultation, drug utilization review, drug formulary management, public exchange, administration of group purchasing organization, and digital consumer health and drug information services. This segment also provides Medicare, Medicaid, and health insurance marketplace products; Express Scripts SafeGuardRx, a suite of solutions targeting the therapy classes that pose clinical challenges and budgetary threat to its clients; and Inside Rx, a program that provide affordable access to medication for uninsured and underinsured individuals. Its Other Business Operations segment distributes specialty pharmaceuticals and medical supplies, including injectable and infusible pharmaceuticals and medications to treat specialty and rare/orphan diseases. This segment also provides medical benefit management solutions for radiology, cardiology, musculoskeletal disorders, sleep disorders, post-acute care, genetic lab, specialty pharmacy, and medical oncology. The company serves patients, self-funded plans, health plans, regulated markets, workers' compensation, physicians, and pharmacists. It operated 4 automated dispensing home delivery pharmacies; 1 non-automated dispensing home delivery pharmacy; 7 non-dispensing order processing centers; 5 patient contact centers; 9 specialty home delivery pharmacies; and 34 specialty branch pharmacies as of December 31, 2017. Aristotle Holding that began operation in 1986 became Express Scripts Holding Company in April 2012, with its headquarters in Saint Louis in Missouri. Express Scripts operates as a subsidiary of Cigna as of December 20, 2018.