About a-team Marketing Services
The knowledge platform for the financial technology industry

A-Team Insight Blogs

Release of ISIN-to-LEI Relationship Files on GLEIF Website Meets Mixed Response

Subscribe to our newsletter

The release of mapping between International Securities Identification Numbers (ISINs) and Legal Entity Identifiers (LEIs) by the Association of National Numbering Agencies’ (ANNA) and the Global LEI Foundation (GLEIF) has received a positive industry response, but also raised questions about why a significant number of National Numbering Agencies within ANNA have not yet opted into the initiative.

The GLEIF initially talked about plans to map ISINs and BIC codes to LEIs to enhance their use back in April 2017. Swift and the GLEIF fulfilled their plans to deliver a BIC-to-LEI relationship file in early 2018. An ISIN-to-LEI relationship file was introduced late last week with the aim of improving transparency of exposure by linking the legal issuing entity to its issuance of securities, and addressing some of the regulatory requirements under the Prospective Directive, Central Securities Depositories Regulation (CSDR) and Securities Financing Transactions Regulation (SFTR).

ANNA and the GLEIF have been working on the technical development of mapping ISINs to corresponding LEIs over the past nine months, an exercise that has brought together two ISO standards – ISIN ISO 6166 and LEI ISO 17442 – and provides a consolidated view of ISIN-to-LEI links provided by National Numbering Agencies (NNAs) to the ANNA Service Bureau and on to the GLEIF. The published ISIN-to-LEI mapping is freely available to all on the GLEIF website.

Audience members of a webinar on data standards and global identifiers hosted by A-Team Group this week noted that ISIN-to-LEI mapping is a real value add for data management practitioners. They also questioned why only a limited number of NNAs are currently taking part in the initiative. According to ANNA and the GLEIF, 11 NNAs opted in from the start, with others expected to follow in coming months.

Subscribe to our newsletter

Related content

WEBINAR

Upcoming Webinar: Taming the Private Markets Data Beast: Solving for Valuation, Integration, and Reporting in Alternative Investments

Date: 7th October 2026 Time: 10:00am ET / 3:00pm London / 4:00pm CET Duration: 50 minutes Institutional activity in private markets has surged as organisations’ traditional investment theses have been upended by global economic volatility, geopolitical instability and fee compression. In their search for better risk-adjusted returns, they have found a rich seam of alpha...

BLOG

A-Team Group Announces Capital Markets Technology APAC Awards 2026 Winners and Launches ‘State of the Market’ Report

A-Team Group today announced the highly anticipated winners of the Capital Markets Technology APAC Awards 2026. These prestigious awards celebrate the most innovative solution providers and financial institutions that are reshaping the capital markets technology landscape across the dynamic Asia Pacific region. In conjunction with the awards, A-Team Group has also launched the “State of...

EVENT

TradingTech Summit New York

Our TradingTech Summit in New York is aimed at senior-level decision makers in trading technology, electronic execution, trading architecture and offers a day packed with insight from practitioners and from innovative suppliers happy to share their experiences in dealing with the enterprise challenges facing our marketplace.

GUIDE

Regulatory Data Handbook 2026 – Fourteenth Edition

Welcome to the fourteenth edition of A-Team Group’s Regulatory Data Handbook. Supervisors increasingly expect firms to demonstrate which rules apply, which data supports each obligation, who owns the control and how exceptions are identified and resolved. Policies and implementation programmes must now be supported by records that can withstand regulatory scrutiny. This edition examines material...