New ESMA forms for green bond verifiers: what changes in 2026

Key data

If your company acts as an external verifier of European green bonds, from March 12, 2026 there is a specific and mandatory way to communicate changes to ESMA. Implementing Regulation (EU) 2026/543 establishes the standardized forms, templates and procedures you must use when significant modifications occur in the information you provided when registering. It is not enough to notify: it must be done in the correct format.

This standard develops the Regulation (EU) 2023/2631, the European Green Bond Standard (EU GBS), which created the mandatory framework for verifier registration with ESMA. Now the regulatory cycle is closed with the technical implementing standards that specify how to keep that registration updated.

What does this regulation establish?

Implementing Regulation (EU) 2026/543 regulates three specific elements that external verifiers must apply when material changes occur in their organization:

• Standardized forms: specific documents that must be completed to notify significant modifications to ESMA.
• Standardized templates: predefined formats that standardize the information presented to the supervisor.
• Standardized procedures: steps and deadlines that govern the notification process from when the change occurs until ESMA receives and processes it.

The objective is for ESMA to receive homogeneous and comparable information from all verifiers registered in the EU, regardless of their size or country of origin. Before this standard, the data update process lacked a binding technical format for modifications after initial registration.

The changes that trigger the notification obligation are those considered "significant modifications": material alterations in internal organization, corporate structure, activity or any other relevant data provided at the time of registration.

Economic and operational impact

This regulation does not generate direct costs in the form of fees or quantified sanctions in the published text. Its impact is primarily operational and regulatory risk:

• Internal adaptation cost: verifiers must review their compliance processes to incorporate the new forms and templates into their usual workflows when organizational changes occur.
• Non-compliance risk: not using the correct forms or failing to notify in a timely manner may directly affect registration status with ESMA, which is equivalent to losing authorization to operate as a verifier in the European green bond market.
• Business impact: for entities whose business model depends on verification of European green bonds, loss of registration means the inability to provide that service in the EU, with the resulting impact on revenue and ongoing contracts.
• Market standardization: standardization benefits verifiers who already operated with orderly processes, and puts at risk those who managed communications with ESMA informally or unstructured.

Who does it affect?

The standard exclusively affects entities registered with ESMA as external verifiers under Regulation (EU) 2023/2631. In practice, this includes:

• Audit firms that provide verification services for European green bonds.
• Specialized consultancies in sustainable finance and ESG with verifier registration with ESMA.
• Credit rating agencies that also act as verifiers of compliance with the European green bond standard.
• Any entity that has obtained or is in the process of obtaining external verifier registration with ESMA to operate in the European green bond market.

It does not affect green bond issuers or investors. It also does not affect verifiers operating solely under private standards (such as ICMA's Green Bond Principles) without registration with ESMA.

Practical example

A Spanish consultancy registered with ESMA as an external verifier of green bonds decides in 2026 to reorganize its corporate structure: it creates a specific subsidiary for verification services and modifies its shareholder composition. This change is a significant modification in the information provided when registering.

Before this standard, the consultancy could have communicated the change through a free-form letter or an email to ESMA. From March 12, 2026, it must do so mandatorily through the standardized forms and templates established in Implementing Regulation (EU) 2026/543, following the standardized procedure. If it does not do so correctly, ESMA may question the validity of its registration, which would affect its ability to issue valid verifications under the European green bond standard.

What should companies do now?

1. Verify registration status: confirm whether your entity is registered with ESMA as an external verifier under Regulation (EU) 2023/2631. If so, this standard applies to you from March 12, 2026.
2. Locate official forms: access the ESMA portal to obtain the standardized forms and templates published under Implementing Regulation (EU) 2026/543.
3. Review internal compliance processes: identify what types of changes in your organization, structure or activity constitute "significant modifications" that trigger the notification obligation.
4. Update internal procedures: incorporate the new forms and standardized procedure into organizational change management protocols, so that any relevant modification automatically triggers the notification process to ESMA.
5. Train the responsible team: ensure that those responsible for relations with ESMA are familiar with the new forms and deadlines before any change that needs to be reported occurs.

Official source

Consult complete regulation in official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://eur-lex.europa.eu/./legal-content/AUTO/?uri=OJ:L_202600543