Best fortune 500 companies in Portland, ME

Humana Inc., headquartered in Louisville, Kentucky, is a leading health care company that offers a wide range of insurance products and health and wellness services that incorporate an integrated approach to lifelong well-being. Since Humana's establishment in 1961, the company's main purpose has been to support people in their daily endeavors to live a healthy life, create innovative programs and partnerships that reflect the company's commitment.

For over 40 years, Animal Health International, Inc. has been the premier animal health service provider in North America. The company represents over 1,000 manufacturers that supply products focused on beef and dairy cattle, equine, poultry, and swine. Moreover, this reliable business offers products ranging from vaccines and pharmaceuticals to high-technology art equipment and software.

Owens-Illinois, Inc. is a glass container manufacturer. The Company is also a preferred partner for various food and beverage brands. It provides glass packaging for beer, wine, spirits, food, non-alcoholic beverages, cosmetics and pharmaceuticals. It also produces tableware and stemware for household use. The Company manufactures glass containers in a range of sizes, shapes and colors. It has 77 glass manufacturing plants in 21 countries. The Company has four reportable segments based on its geographic locations: Europe, North America, South America and Asia Pacific. Its customers include Anheuser-Busch InBev, Brown Forman, Carlsberg, Coca-Cola, Constellation, Diageo, Heineken, Kirin, MillerCoors, Nestle, PepsiCo, Pernod Ricard, SABMiller, and Saxco International. The Company has 35 glass container manufacturing plants located in the Czech Republic, Estonia, France, Germany, Hungary, Italy, the Netherlands, Poland, Spain and the United Kingdom

Robert Half is a professional services company and is the world's first and largest accounting and finance staffing firm. The company was founded by Robert Half in 1948 by providing professional staffing services. Robert Half is also now involved in risk consulting and internal audit services in addition to its human resources consultancy business. The company reported revenues of US$4.2 billion for the fiscal year 2013.

Tyson Foods, Inc. The company is the world's second largest processor and marketer of chicken, beef, and pork after JBS SA and annually exports the largest percentage of beef out of the United States.

Since their founding in 1848, Unum has been known for breaking new ground in the business of benefits. Integrity, determination, innovation and leadership were at the core of their company 165 years ago, and they are just as relevant to their business today. Just as long-lasting has been their commitment to being there when people need us most, a simple but compelling philosophy that began before the Civil War during a time when investing in insurance to protect yourself from the financial effects of illness and injury was a radical idea. They persevered during the fledgling insurance landscape then, and we're equally committed today to educating consumers about the value of financial protection benefits. Take a look below at Unum and its predecessor companies throughout the years.

Fiserv is a global organization with more than 13,000 clients and 21,000 associates worldwide and takes pride in its mission to enable clients to achieve best-in-class results. The company is highly regarded for its financial services technology and services innovation, including award-winning solutions for mobile and online banking, payments, risk management, data analytics and core account processing. Fiserv is helping its clients push the boundaries of what's possible in financial services, delivering deep expertise and innovative solutions to help financial institutions, businesses and consumers move and manage money faster and with greater ease than ever before.