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Who Must File

Under state law, three classes of businesses are required to file assumed names with the local county clerk's office. The business classifications listed below are defined fully in the Illinois Compiled Statutes.

Businesses required to file

The following types of companies that conduct business in Cook County are required to file assumed names with the Clerk's office:
  • Sole proprietorships
    Businesses defined under state law as being owned by an individual or husband and wife.

  • General partnerships
    An association of two or more persons who carry on as co-owners a for-profit business entity.

  • Professional services corporations
    A business corporation formed by an individual or group of individuals who are required by law to be licensed or obtain other legal authorization from the state to deliver services (examples include doctors, dentists, land surveyors, podiatrists and some attorneys).

Businesses not required to file

The following types of companies that conduct business in Cook County are not required to file assumed names:
  • Limited liability companies
    A business entity, distinct from its members, which maintains on file a limited liability registration with the Secretary of State's office.

  • Limited liability partnerships
    An association of two or more persons who carry on as co-owners for a for-profit business entity that is distinct from its partners and which maintains on file a limited liability registration with the Secretary of State's office.

  • Limited partnerships
    An association of two or more persons who carry on as full and partial owners or investors for a for-profit business entity that is distinct from its partners.

  • Corporations
    A business managed by directors and created with powers (to issue shares, buy properties, etc.) and liabilities independent of its individual members as defined by state law.
 

Business Name Registration...
Who Must File
Registering an assumed name
Notification of business changes

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