# OF EMPLOYEES: 4,940

WEBSITE: www.edward.org

Edward-Elmhurst Health is one of the larger integrated health systems in Illinois. The system was created by the merger of Edward Hospital and Elmhurst Memorial Healthcare in 2013.

# OF EMPLOYEES: 3,000

WEBSITE: networks.nokia.com

Nokia is a global leader in creating the technologies at the heart of our connected world.

# OF EMPLOYEES: 3,022

WEBSITE: www.ipsd.org

Indian Prairie School District 204 (abbreviated IPSD) serves roughly 28,500 students from the Illinois communities of Aurora, Bolingbrook, Plainfield and Naperville, in DuPage and Will counties. Currently, one preschool, twenty-one elementary schools, seven middle schools, three high schools, and one alternative high school are in the district. There are thirty-one District 204 schools in Naperville and Aurora and one in Bolingbrook.

# OF EMPLOYEES: 2,367

WEBSITE: www.naperville203.org

Naperville 203 is a nationally recognized school district committed to a mission focused on student success and a passion for life-long learning.

# OF EMPLOYEES: 2,140

WEBSITE: www.nicorgas.com

Nicor Gas is a natural gas distribution company that serves more than 2.2 million customers in a service territory that encompasses most of the northern third of Illinois, excluding the city of Chicago.

# OF EMPLOYEES: 1,800

WEBSITE: www.bp.com

The world is changing fast and BP is changing with it. The mix of energy that provides heat, light and mobility for billions of people is shifting towards lower carbon sources, driven by advances in technology and growing concerns about climate change.

# OF EMPLOYEES: 1,250

WEBSITE: www.bmoharris.com

Established in 1882 as Harris Bank, and owned by BMO Financial Group (TSX, NYSE: BMO) since 1984, BMO Harris Bank has grown to become one of the largest banks in the Midwest serving personal, commercial and affluent customers.

# OF EMPLOYEES: 1,300

WEBSITE: www.nalco.com

A trusted partner at more than one million customer locations, Ecolab (ECL) is the global leader in water, hygiene and energy technologies and services that protect people and vital resources.

# OF EMPLOYEES: 965

WEBSITE: www.naperville.il.us

Located 28 miles west of Chicago, Naperville, Ill., consistently ranks as a top community in the nation in which to live, raise children and retire. This vibrant, thriving city is home to acclaimed public and parochial schools, the best public library system in the country, world-class parks, diverse worship options, an array of healthcare options and an exceptionally low crime rate.

# OF EMPLOYEES: 625

WEBSITE: www.northcentralcollege.edu

North Central College is an independent, comprehensive college of the liberal arts and sciences that offers more than 55 undergraduate majors and graduate programming in five areas.

# OF EMPLOYEES: 848

WEBSITE: www.sikich.com

Sikich LLP is a professional services firm helping middle market companies. Services include accounting, tax, advisory, managed services, ERP and technology.