Illinois Secretary of State (SOS) Business Entity And Corporation Search

Illinois state map

Illinois Business Corporation Registry Search

Updated: February 17th, 2018

The Secretary of State of Illinois maintains one of the country’s largest databases which contain information on hundreds of thousands of business entities, primarily including Corporations and Limited Liability Companies (LLCs).

The business database also has information regarding the following entities:

  • Corporations
  • Not-for-Profit Corporations
  • Limited Partnerships
  • Limited Companies
  • Limited liability Companies

Illinois Business Entity Search

To do your search for a business entity, you need to know to have at least one of the following information with you:

  • Name
  • Keyword
  • Partial Word
  • File Number

To make your search easier, we have created an easy-to-follow guide for you below.

1. Click here to go to the Search Page (it will look like the screenshot below).

illinois business entity and corporation search

2. Choose what type of business entity you are searching for. In this example, we’ve selected “Corporate and LLC”.

Illinois search by entity name

3. Next, choose any of the search methods provided. In this example, we’ve chosen to search by name.

4. Now enter the Business Entity name in the field. For our sample name, let us type in “Exelon“, then click the “Submit” button.

Business search result

5. The Results Page will then appear (see the screenshot below for reference).

Company Details

Click on the business entity’s name to access more information including its File Number, Status, Entity Type, Qualification Date, etc.

Here you can also request a certificate of good standing.


Information on the Illinois (IL) SOS

Illinois sos seal


As the second largest constitutional office of the state, the Secretary of State of Illinois is also an elected governmental institution.

The Secretary of State of Illinois is a government office visited by more Illinois residents than any other government office in the state.

Jesse White, a Democrat, has been the incumbent office holder since 1999.


The Secretary of State of Illinois is the custodian of the public records, Illinois UCC filings and archives, state laws, state records, State Capitol and Library. Aside from registering corporations, lobbyists and notaries, he is also in charge of issuing licenses to Illinois-registered vehicles and motorists.

Select the State Where the Corporation is Registered: