> Largest company: Koch Industries, Inc.
> Revenue: $100.0 billion
> Headquarters: Wichita, KS
> Industry: Conglomerate
Founded in 1940, Koch Industries is the biggest company in Kansas and one of the biggest private companies in the world. Through its subsidiaries, the family-owned and -operated conglomerate has interests on six continents in industries as disparate as chemicals, ranching, commodity trading, and fuel production.
> Largest company: Humana Inc. (NYSE: HUM)
> Revenue: $54.4 billion
> Headquarters: Louisville, KY
> Industry: Insurance
Close to 320 million Americans have health insurance coverage. Health insurance networks are often divided by geographical region, and as a result, there are very large health insurance companies found all over the country. Humana, one of the largest health insurance companies in the United States, is based in Louisville. The company covers more than 14 million Americans, including about 630,000 in Kentucky. Of its over 500 offices and medical facilities, only 26 are in Kentucky and over 200 are in Florida.
> Largest company: Rain CII Carbon LLC
> Revenue: $23.6 billion
> Headquarters: Covington, LA
> Industry: Coal producer
In 2007, Indian company Rain Calcining Limited acquired U.S.-based CII Carbon. The resulting company, Rain CII Carbon LLC, relocated its headquarters to Covington, Louisiana in 2014 — some 10 years after it had to move out of the state following the events of Hurricane Katrina. The company reported revenue of $23.6 billion in 2016, and is one of the largest calcined petroleum coke producers in the world.
> Largest company: IDEXX Laboratories, Inc. (Nasdaq: IDXX)
> Revenue: $1.8 billion
> Headquarters: Westbrook, ME
> Industry: Healthcare
IDEXX Laboratories is a multinational corporation that develops and manufactures products related to the veterinary and animal testing industries. One of the company’s flagship products, the SNAP test, can detect a range of diseases in dogs, cats, and other animals. Since 2006, the company has invested more than $80 million in new facilities throughout southern Maine, where it employs many of its 7,365 employees.
> Largest company: Lockheed Martin Corporation (NYSE: LMT)
> Revenue: $47.2 billion
> Headquarters: Bethesda, MD
> Industry: Defense contractor
Lockheed Martin is one of a number of large defense contractors are based in the Washington D.C. area. It is the largest company in Maryland, with $47.2 billion in revenue in 2016. The company had a total of $36.3 billion in federal contract obligations in the government’s 2015 fiscal year, the most of any U.S. defense contractor. Lockheed has produced many of the military’s most widely-used vehicles, aircraft, and weapons systems.