UEN explained: Singapore's Unique Entity Number

If you sell B2B in Singapore, you have seen UENs everywhere: on invoices, in email footers, on the corporate registry, on every government form. The UEN, or Unique Entity Number, is the single identifier every registered Singapore entity carries, and it is quietly one of the most useful fields a sales team can keep on a contact record. Here is how the number works, what it tells you about a company before you ever speak to them, and how to put it to work in prospecting.

What a UEN is and who must have one

The UEN is Singapore's standard identification number for entities. It was introduced in 2009 so that one number works across every government interaction, from filing taxes with IRAS to applying for permits and grants, instead of a different reference for each agency. Companies and business firms receive their UEN from ACRA, the Accounting and Corporate Regulatory Authority, when they register; other entities such as societies, management corporations, and healthcare institutions get theirs from their own issuing agency. Any entity registered in Singapore that deals with government agencies needs one, which in practice means every legitimate local business you will ever prospect has a UEN.

Decoding the three UEN formats

A UEN is 9 or 10 characters, and the structure is not random. There are three formats, and each tells you what kind of entity you are looking at, and often how old it is.

That third format rewards a closer look. A UEN beginning T09LL belongs to a limited liability partnership issued its number in 2009; S98 marks 1998. The two-letter codes cover dozens of entity types, so the UEN alone often tells you whether you are dealing with a local company, a foreign branch, or a partnership before you have read a single line of their website.

UEN vs ACRA registration number vs GST number

Three identifiers get mixed up constantly, so here is the untangling. For entities registered with ACRA from 2009 onwards, the UEN and the ACRA registration number are the same number; ACRA simply issues registration numbers in UEN format. Entities that existed before 2009 kept their old ACRA number as their UEN, which is why the 9-digit format exists. The GST registration number is a different thing: a business only has one if it is registered for GST, and for most local entities the GST number is simply their UEN again, though some registrants are issued a separate GST number in a different format. The practical takeaways:

• Every registered entity has a UEN, and it never changes for the life of the entity.
• For ACRA-registered businesses and companies, the ACRA registration number and the UEN are one and the same.
• A GST registration only exists once a business crosses the compulsory threshold of S$1 million in annual taxable turnover (or registers voluntarily), so its presence is a useful size signal on its own.

Why UENs matter for B2B prospecting

For a sales team, the UEN is the cleanest join key in the Singapore market. Company names are messy: 'ABC Holdings', 'ABC Holdings Pte. Ltd.', and 'ABC Holdings Pte Ltd' might be one company or three. The UEN is unambiguous, so matching on it solves problems that fuzzy name matching never quite does.

• Deduplication: two records with the same UEN are the same company, full stop. Merge them once and your reps stop double-emailing the same account.
• Qualification: a year-prefixed UEN tells you company age instantly. A 2024-incorporated entity is a startup conversation; a 1998 one is an established-business conversation.
• Verification: a prospect with no UEN on record is either foreign or not actually registered, which is worth knowing before you invest a whole sequence in them.
• Enrichment: the UEN links your CRM record to the official register, so you can pull registered name, entity status, and industry classification reliably instead of guessing from a website.

How to look up a UEN free

You do not need a paid data subscription to check a UEN. ACRA's Bizfile portal lets you search entities by name or UEN at no cost, and the government's open data includes the register of live entities. If you want a quick answer mid-prospecting, we keep a free UEN lookup tool on this site: paste a UEN or a company name and get the registered entity details back in seconds, no login needed.

Common UEN questions

Is the GST registration number the same as the UEN? For most GST-registered Singapore entities, yes: the GST registration number is the entity's UEN. The two are not the same thing conceptually, though. Every registered entity has a UEN from the day it registers, while a GST number exists only once the business is GST-registered, so the absence of GST registration tells you something about size while the UEN tells you nothing of the sort.

Why does a Singapore branch office UEN not start with 2024 or 2025? Because the year-prefixed format belongs to locally incorporated companies. A foreign company registering a branch here is issued a UEN in the letter-prefixed format instead, so a branch UEN never carries a four-digit year at the front. Read the two-letter entity code rather than the shape alone, though: the letter-prefixed format also covers LLPs, societies, trade unions and several other types, so the absence of a year tells you only that the entity is not a local company. It is the FC code that marks a foreign company specifically.

Can one organisation have two UENs, one from ACRA and one from the Registry of Societies? No. A UEN identifies a legal entity, and each entity has exactly one for its whole life. What looks like a double UEN is almost always two separate legal entities under one brand, for example a company registered with ACRA alongside an associated society or charity registered with its own issuing agency. For prospecting purposes treat them as two records, because legally that is what they are.

What do the first four digits of a UEN mean? On a locally incorporated company they are the year of registration, so a UEN beginning 2019 belongs to a company incorporated in 2019. On the other two formats there is no four-digit year at all, which is why company age can only be read straight off the number for local companies.

Does the UEN have to appear on a company stamp? There is no requirement to put it on a stamp specifically. The obligation attaches to documents rather than to stamps: a company must show its registered name and registration number on its business letters, statements of account, invoices and official notices. Many Singapore firms simply add the UEN to their company stamp because it is the most convenient place to carry it, which is why it looks like a rule.

How do I search for an entity by UEN? ACRA's Bizfile portal is the official route and it is free. For a faster answer while you are prospecting, our free UEN lookup tool returns the registered entity details from a UEN or a company name with no login.

Where HuntSales fits

HuntSales bakes ACRA data into the contact record, so the UEN is not an extra field you maintain by hand. Singapore companies in People Search carry their UEN, registered name, and entity details; contacts you add are deduplicated against it; and prospecting filters lean on real registry data rather than scraped guesses. If Singapore is your market, that is the difference between a list that looks local and one that actually is. For the wider playbook, see how B2B outreach in Singapore fits together, from PDPA-aware sending to local data.