Understanding National IDs in MiFIR Transaction Reporting

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Natural Person Identifiers in MiFIR Transaction Reporting

Natural person identifiers are an important part of transaction reporting and contain some complexity in their application due to the variety of identifiers available. 

It’s widely-known that corporate counterparties need to be identified by their legal entity identifier (LEI) in MiFIR transaction reports. This is simple and straight-forward.

Where the counterparties are natural persons, the reporting of natural person information including identifiers, names and dates of birth will be required. The type of identifier to be used will depend on the priority given in the Annex II of RTS 22.

Fields requiring population of a natural person or corporate identifier

Field numberField nameInput (if subject is natural person)
Buyer Fields
7.Buyer identification codeCorporate identifier/Natural person identifier
8.Country of the branch for the buyerCountry code
If buyer is a client and a natural person:
9.Buyer – First Name(s)First name(s)
10.Buyer – Surname(s)Surname(s)
11.Buyer – Date of BirthDate of birth
If buyer is a client and acting under a power of representation:
12.Buyer decision-maker codeNatural person identifier
If buyer is a client, acting under a power of representation and natural person
13.Buyer decision maker – First Name(s)First name
14.Buyer decision maker – Surname(s)Surname
15.Buyer decision maker – Date of BirthDate of birth
Seller fields
16.Seller identification codeCorporate identifier/Natural person identifier
17. - 24. [Mirror buyer fields 8. – 15.][Mirror buyer fields 8. – 15.]
Investment decision and execution
57.Investment decision within firm*Corporate identifier/Natural person identifier
59.Execution within firm*Corporate identifier/Natural person identifier

*To learn how to populate these fields and the “trading capacity” field, please visit our page – MiFIR Reporting for STP Brokers.

Which natural person identifiers should you use?

Annex II of RTS 22 provides guidance to all EU investment firms on the type of identifier to use according to the nationality of a counterparty.

Basic rule

Basic ruleTwo-digit “alpha-2” code plus Annex II identifierCONCAT
Priority of identifiers The highest priority identifier that a person has as provided in Annex II should be used. It is not relevant that an investment firm may not know the highest priority identifier.Concatenation (combination) of:

1. Date of birth (YYYYMMDD)
2. First five characters of first name
3. First five characters of surname

• For first names and surnames, prefixes and punctuation are excluded
• If the name is less than five characters then use # to fill remaining spaces
Nationality(ies) of the natural person
More than one European Economic Area (“EEA”) countryUse two-letter alpha-2 code which is first when arranged alphabetically and use corresponding identifier from Annex II.
Non-EEA“All other countries” field in Annex II to be used – this is the National Passport Number and CONCAT (see column to the right)
EEA and non-EEAThe two-letter “alpha-2” code and the identifier provided in Annex II (i.e. same as EEA only nationality)


If a counterparty is from Belgium, the 1st priority would be Belgian National Number. If this identifier is not available, then CONCAT would be used as a 2nd priority. The 3rd priority is not available for Belgium nationals but is available for some others.

ISO 3166-1 alpha 2Country1st priority identifier2nd priority identifier3rd priority identifier
BEBelgiumBelgian National Number (Numero de registre national - Rijksregisternummer)CONCAT

What about UK nationals?

Since Brexit (from 1 January 2021 onwards), the UK is no longer part of the European Union (EU) and European Economic Area (EEA), and is treated as a third country under EU MiFIR reporting.

Regardless of whether your clients that are UK nationals were onboarded before or after Brexit, you are now required to report their passport numbers. This is what you need to do:

All other countriesNational Passport NumberCONCAT

As an EU investment firm, how do you report a UK national?

Since the UK is classified as a third country now, you will need to use the requirements under the category of ‘all other countries’, being National Passport Number as the priority 1 identifier, CONCAT as priority 2.

What do you need to do?

Recommendation 1

Whether your clients that are UK nationals were onboarded before or after Brexit, you are now required to report their passport numbers. This is what you need to do:

  1. UK nationals onboarded before Brexit – update their details in your system with their passport numbers
  2. UK nationals onboarded after Brexit – always collect their national passport details

Recommendation 2

We suggest you take the opportunity to review your client onboarding process against Annex II of RTS 22 to ensure that you are requesting the appropriate national identifier information for each client based on their nationality (or nationalities). It may be worthwhile reviewing national identifiers held across your entire client base to ensure they are current and have provided you with the highest priority identifier they have available.

Will the transactions/identifiers get rejected based on validation?

You should ensure that you have appropriate validation processes in place when collecting the natural person identifiers across the various nationalities so that where there are any queries by a regulator you have appropriate records to provide.

It is not possible for an Approved Reporting Mechanism (ARM) to validate if the correct priority identifier is used in your reporting, or whether the right nationality is reported. This means a report may be accepted by the ARM without necessarily being technically correct according to RTS 22. However, this does not mean that a future and more in-depth review of your reporting by a regulator will not highlight the importance of following these national client identifier requirements. 

If you still have any questions, please contact us.

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