Connecticut Business ID & ALEI Search

Connecticut business ID search returns a single entity when the identifier is correct, which makes it the most reliable query in the state registry. The identifier is called the ALEI, short for Authoritative Legal Entity Identifier, and it appears on every filing confirmation, certificate, and search result the Secretary of the State issues. A query with the ALEI skips the name-matching problem entirely, because the number belongs to one entity and never transfers to another.

This page covers where the ALEI comes from, how it differs from a filing number and a federal tax number, what a single-result lookup shows, and what to do when a number returns nothing. It is written for bookkeepers, vendor managers, and owners who already have a number and need the record behind it. Fees appear in the table only.

How to search by Connecticut business ID

The Business Records Search accepts a business name, a business ALEI, or a filing number in the same field. Paste the ALEI and the result is one record rather than a list. The record opens with the legal name, the entity type, the status, and the formation date, followed by the registered agent, the principal office, and the filing history.

Where to find the ALEI

The number appears on the certificate of organization or incorporation confirmation, on every annual report acknowledgment, on a certificate of legal existence, and on the top of a search result. It also appears on correspondence from the Business Services Division. If you have a filing but not the number, open the filing confirmation email and read the top of the message.

Entering the number

Enter the ALEI as a continuous string without spaces, dashes, or leading labels such as “ALEI”. The search field treats punctuation as part of the query in some browsers, so a copied number that carries a hidden character can fail. If the first attempt returns nothing, retype the digits rather than pasting them again.

Searching by filing number instead

The filing number identifies a document rather than the entity. Use it when you need a specific certificate or annual report and you already know which one. A filing number search returns the document that carries that number, which may not be the current record of the entity. The Connecticut filing history page covers how documents stack up behind the entity.

What a single result looks like

A single result is short. It shows the legal name, the ALEI, the entity type, the status, the formation date, the registered agent and address, the principal office, the NAICS code, the members or officers on file, and a list of filings. It does not show revenue, ownership percentages, or tax standing, because the registry does not hold those records.

What the ALEI actually is

The ALEI is the state’s permanent identifier for a legal entity. It is assigned when the formation filing is accepted and it remains with the entity through name changes, address changes, agent changes, conversions, and reinstatement. It is the number the state uses internally to connect filings, and it is the number a business should quote whenever it contacts the office.

The word behind the acronym

Authoritative Legal Entity Identifier describes the role rather than a technical standard. The state treats the ALEI as the authoritative reference for the entity, which is why a search by number is preferred over a search by name. Other states use terms such as entity number, file number, or business ID for the same idea, and a form written for another state may use a different label for a similar field.

What the ALEI is not

The ALEI is not a federal tax number, a state tax registration, a license number, or a credit identifier. It does not encode the entity type, the formation date, or the town. It is a sequence assigned by the registry, and reading meaning into the digits is a mistake that leads to bad assumptions about the business.

Why the state adopted the term

Connecticut rebuilt its business portal and needed a single label that separated the entity identifier from the filing number and from the federal employer identification number. The ALEI label appears throughout the modern portal, while older filings and third-party guides still use “business ID” or “entity ID” for the same number. All three labels point to the same field.

ALEI, EIN, and filing number compared

Three identifiers appear on Connecticut business paperwork, and they are easy to confuse because they are all short strings of digits. Each one answers a different question, and a form that asks for one is not asking for the others.

When a form asks for the business ID

A bank, a vendor portal, or a procurement office that asks for a Connecticut business ID usually wants the ALEI. A federal form that asks for a taxpayer identification number wants the EIN. A state tax form that asks for a registration number wants the Department of Revenue Services account. Read the label rather than the length of the field, and keep all the numbers in one place so the next form is fast to complete.

Where the ALEI appears on a record

The number sits at the top of the record and repeats in the filing history beside each document. It also appears on the certificate of legal existence, which is the document a bank or a landlord usually requests. A certificate carries the number, the legal name, the formation date, and a statement that the entity is current with its filing obligations.

When you save a record, save the ALEI with it. A screenshot without the number is hard to match later, and a printed page without the date cannot show what the record said on the day you checked. Store the number, the status, and the date together, and the next review takes seconds.

Using the business ID across agencies

The ALEI is a state registry number, not a universal business identifier. Each agency keeps its own account numbers, and a business that registers with several agencies ends up with several identifiers. The ALEI is the thread that ties the records together when you need to confirm that two accounts belong to the same entity.

Tax registration

The Department of Revenue Services issues a separate registration number for sales and use tax and for withholding. That number is not the ALEI, and the tax portal does not accept the ALEI in place of it. A business that needs both should record them side by side, because a vendor form may ask for the state ID and the tax permit in the same section.

Licensing

Licenses are issued by the agency that regulates the activity, and each license carries its own number. The entity record confirms that the business exists; the license record confirms that it may perform the regulated work. A contractor with an active entity record and a lapsed license is still not permitted to take the job.

UCC filings

A UCC financing statement names the debtor by its legal name and often includes the ALEI in the collateral or the addendum. The lien search returns the filing, the secured party, and the amendment history. A lender checking a borrower uses the ALEI to confirm that the debtor on the lien is the same entity that signed the loan documents.

Court and lien records

Court filings and municipal liens use the legal name rather than the ALEI, which is why a judgment can be hard to match to a business record. When the names differ because of a former name or an assumed name, the filing history and the amendment record are what connect the two. The Connecticut business status page covers how a status change appears after a judgment or a reinstatement.

When the ID does not return a result

An empty result is not proof that the business does not exist. The number may belong to another state, the entity may have been formed under a different type, or the digits may have been copied with an error. Work through the possibilities before you tell a colleague that the record is missing.

Wrong registry

A business formed in Massachusetts, New York, or Rhode Island has its own home-state number, and that number will not return a Connecticut record unless the business registered as a foreign entity. A foreign entity that registered in Connecticut has both numbers, and the Connecticut record shows the home state.

Transcription errors

A number copied from a fax, a photographed certificate, or a handwritten note can carry a wrong digit. Compare the number with a second source, such as an annual report acknowledgment or a bank letter. If the two sources disagree, the state record is the one that governs.

Phone calls are another source of error. A number read aloud can turn eight into three and one into seven, and the caller rarely notices until the search fails. Ask the other party to send the number in writing, then compare it with the certificate before you spend time on a lookup that cannot succeed.

Name changes and mergers

A merger can retire an ALEI, and a conversion can move the entity to a new type without changing the number. A reinstatement keeps the original ALEI, which is why a forfeited record returns when the entity is restored. If a number returns nothing, check the filing history of the likely survivor before concluding that the entity is gone.

Bulk data and business lists

Connecticut publishes bulk access to business entity data and to active UCC lien data through the business portal. The business entity database is available at no charge for download, and it is the source behind many commercial directories. A bulk list is useful for research and for market mapping, but it goes out of date fast and it does not include tax, license, or credit information.

A commercial directory that sells a “Connecticut business list” is usually repackaging the same state data. Check the date of the extract before you buy, and confirm a few records against the official search. A list that omits the ALEI or the status is hard to verify and easy to misuse.

ID checks in vendor onboarding

Vendor onboarding usually needs four confirmations: the entity exists, the entity is current, the person signing can bind it, and the bank account matches the legal name. The ALEI settles the first two when combined with a certificate of legal existence. The third needs an operating agreement or a board resolution, and the fourth needs the bank’s own verification.

Record the ALEI on the vendor file and date the check. A vendor that is active today can be forfeited next quarter, and a dated record shows what the state held when the contract was signed. That detail matters in a dispute, because the counterparty may claim it was current throughout.

Reading the number on a certificate

A certificate of legal existence is the document a bank, a landlord, or a procurement office usually asks for. It carries the legal name, the ALEI, the formation date, the entity type, and a statement that the entity is current with its filing obligations. The certificate is dated, and the date is what makes it useful, because it speaks only to the day it was issued.

A certificate does not stay valid forever. Most counterparties accept one that is a few months old, and some require a fresh copy within thirty days. Order the short form when you only need to prove existence and standing, and order the long form when a transaction requires the full history. The long form costs more and cannot be expedited.

Read the certificate before you file it. A name that differs from the contract, a formation date that does not match the vendor’s claim, or a status line that says something other than active are all reasons to stop and ask a question. The certificate is a short document, and the errors it exposes are usually the important ones.

How the number links filings over time

Every document the entity files carries the same ALEI, which is what turns a stack of separate filings into a history. A certificate of organization, an amendment, an annual report, and a change of agent all point to the same number even when the legal name changes in between. Without the number, a name change would split the record in two.

That linkage matters after a merger or a conversion. A conversion keeps the ALEI and changes the entity type, so the record shows the old type in the early filings and the new type in the later ones. A merger retires the ALEI of the disappearing entity, and the survivor’s number carries the combined history forward.

A reinstatement keeps the original number as well. A business that was forfeited for two years and then restored still shows the gap, but the number ties the two periods together. A buyer who checks only the current status will miss the gap, which is why the filing history deserves a look whenever the number returns an old record.

Business ID in due diligence

A due diligence request usually includes the entity record, the certificate of legal existence, the operating agreement or bylaws, and the tax registrations. The ALEI is the field that keeps those documents attached to the same business. When two files arrive with different names, the number settles whether they describe one entity or two.

Ask the seller for the ALEI in writing rather than copying it from a website. A number printed on a marketing page can belong to a parent company, an affiliated entity, or a predecessor that was merged away. The number on the formation certificate is the one that matches the entity that signed the contract.

Record the number in the deal file and check it against the state record on the day of closing. A status that was active at the start of negotiations can change before signing, and a dated printout from the closing date is the only record that proves what the state held at that moment. The Connecticut registered agent page covers the field that most often changes between the two dates.

What the ID does not prove

The ALEI proves that an entity is registered and that the record belongs to it. It does not prove ownership, creditworthiness, insurance, licensure, or tax compliance. It also does not prove that the person who quoted the number is authorized to act for the business. A number is an index, not a character reference.

A record with an active status and a clean filing history can still belong to a business with unpaid taxes, a lapsed license, and a judgment. Those facts live in other offices, and each one needs its own search. The identifier helps you keep the searches attached to the same entity, which is the real value.

Frequent ID search mistakes

Most failed lookups come from a handful of habits. The registry is exact about the number, and it does not guess at a near match. A query that ignores that rule returns an empty page that looks like a missing record.

• Pasting with formatting. Hidden characters from a PDF break the match. Retype the digits.
• Using the EIN. The federal number is not in the state registry.
• Using a filing number as an entity ID. The two fields are different, and one does not return the other.
• Assuming an empty result means no business. Check the home state and the filing history first.
• Ignoring the status. A record that opens is not always a record that is current.

Frequently asked questions

The questions below come from bookkeepers and vendor managers who already hold a number. Each reply identifies the field or the agency that resolves it.

Where do I find my Connecticut business ALEI?

It appears on the certificate of organization or incorporation confirmation, on every annual report acknowledgment, on a certificate of legal existence, and at the top of a search result. If you have the legal name, the search returns the number.

Is the Connecticut business ID the same as an EIN?

No. The ALEI comes from the Secretary of the State and identifies the entity for state filings. The EIN comes from the Internal Revenue Service and identifies the business for federal tax. A vendor form may ask for both.

Can I search Connecticut businesses by EIN?

No. The public Business Records Search accepts a name, an ALEI, or a filing number. The EIN is not a search field, and the state does not publish federal tax numbers on the public record.

Does the ALEI change when a business changes its name?

No. The ALEI stays with the entity through a name change, an address change, an agent change, a conversion, and a reinstatement. A merger can retire a number, and the survivor keeps its own.

Is the Connecticut business database free to download?

Yes. The Secretary of the State offers bulk access to business entity data at no charge, and it also offers active UCC lien data. Both extracts go out of date fast, so confirm individual records against the live search.