An Illinois business entity search is free and takes about a minute at the Secretary of State’s Business Entity Search page, apps.ilsos.gov/businessentitysearch.1ILSOS.gov. Business Entity Search Enter the entity’s legal name or its eight-digit Secretary of State file number and the system returns the company’s current status, formation date, registered agent, principal office, and full filing history. That is enough for most vetting: confirming a company exists, checking whether it’s authorized to operate, and finding the person you’d serve with legal papers.
What to Have Ready Before You Search
The cleanest way in is the Secretary of State File Number, an eight-digit code assigned when a business first files its formation or authorization documents with the state.2Illinois.gov GATA. How to Set Your Organization Type and Secretary of State File ID The number is unique to each entity, so it cuts through any confusion caused by two companies with similar names.
If you don’t have the file number, search by legal name. Legal name is the formal name on file with the state, which is not always the brand name a business uses in public. A contractor marketed as “Midwest Home Solutions” might be registered as “MHS Holdings, LLC.” Search the marketing name and you’ll come up empty. Check invoices, signed contracts, or the footer of the company’s website for the legal name; it usually carries a suffix like Inc., LLC, or Corp.
The database covers corporations (including professional corporations), LLCs, limited partnerships, limited liability partnerships, and not-for-profit corporations. You don’t need to know which category applies to run a search, but knowing the entity type helps when you’re trying to distinguish two near-identical names.
How to Run the Search
On the search page, toggle between searching by entity name and searching by file number to activate the correct input field. If you’re searching by name, three matching options are available:
- Starts with returns every entity whose name begins with what you type. Good when you know the first word but not the full legal name.
- Contains catches your term anywhere in the name. This is the widest net.
- Exact match returns only names that mirror your entry precisely. Use this when you already have the full legal name.
You need at least two characters to trigger a search. Before you hit search, make sure you’re in the Corporate and LLC database rather than the Uniform Commercial Code database. UCC is a different section that tracks security interests and liens on personal property; it won’t tell you whether a business exists or is in good standing.
Results come back as a list of every entity matching your criteria. Click the name to open the detail page, which is where the useful information lives:
- Entity status. Active, Inactive, Dissolved, Revoked, or Not in Good Standing.
- Formation or authorization date. When the entity was created (for domestic entities) or authorized to do business in Illinois (for foreign entities organized in another state).
- Registered agent. The name and street address of the person designated to accept legal papers. If you need to serve a lawsuit, this is your starting point.
- Principal office address. The business’s main office on file.
- Jurisdiction. The state or country where the entity was originally organized.
The detail page also includes a File History link showing every document the entity has submitted to the Secretary of State in chronological order, from its original articles of incorporation or organization through amendments, name changes, and mergers.
What the Status Field Is Telling You
The status line is the single most important piece of information for anyone doing due diligence.
Active means the business has kept up with its filing obligations and is authorized to operate in Illinois. That’s the green light.
Not in Good Standing is a warning. It usually means the entity has failed to file an annual report or pay franchise taxes. Illinois requires corporations and LLCs to file an annual report, and the corporate filing fee is $75.3Illinois General Assembly. Business Corporation Act of 1983 – Section 15.10 A business that skips the filing is on the path toward administrative dissolution.
Dissolved means the entity’s legal existence has been terminated, either voluntarily by its owners or involuntarily by the Secretary of State. A dissolved corporation can wind up its affairs, collect debts owed to it, and settle liabilities, but it can’t take on new business.4Justia. Illinois Code 805 ILCS 5 Article 12 – Dissolution and Remedies
If you’re about to sign a contract or wire a large payment to a company that shows anything other than Active, slow down. A dissolved or not-in-good-standing entity may not be able to fulfill its obligations, and chasing accountability later gets complicated.
What the Search Won’t Find
The state database won’t find every business name you see in the world. Sole proprietorships and general partnerships file their “Doing Business As” or assumed names with the county clerk in the county where they operate, not with the Secretary of State. If your search comes back empty and you suspect you’re dealing with a sole proprietor or general partnership, contact the county clerk’s office where the business is located.
Corporations can file assumed corporate names with the Secretary of State, and if they have, the assumed name will surface in the Corporate and LLC search. Corporate assumed-name filing fees run from $30 to $150 depending on where the application falls in the five-year renewal cycle.3Illinois General Assembly. Business Corporation Act of 1983 – Section 15.10
When You Need an Official Document
The online lookup is free, but official paperwork costs money. Two things people commonly order:
A Certificate of Good Standing is a formal document confirming an entity is active and current on its filings. Banks, landlords, and government agencies often require one. You can order it online through the Secretary of State’s business services portal for $25.5ILSOS.gov. Business Search / Certificate of Good Standing
Copies of filed documents can be ordered from the File History page. These are images of original filings like articles of incorporation, amendments, and annual reports, useful when you need to review the actual language rather than the summary data. If you need a copy that can be admitted in court, the Business Corporation Act provides that documents certified by the Secretary of State are accepted as prima facie evidence of the facts they contain.6Illinois General Assembly. Business Corporation Act of 1983 Full Text – Section 1.20 Copy and certification fees are posted on the Secretary of State’s fee schedule.