15 sustainable finance labels explained: our comprehensive 2026 comparison

The essential guide to understanding, comparing and making the most of the sustainability labels that shape the European market.

Labels: a decisive competitive advantage

Sustainable finance labels have established themselves as one of the most powerful signals for capturing the attention of sustainable investors. Whilst demand for responsible products shows no sign of waning, financial institutions that have a firm grasp of the labels (their requirements, criteria and scope) gain a decisive competitive advantage. Conversely, a poor understanding of these frameworks exposes organisations to real risks: poor product positioning, non-compliance, and accusations of greenwashing.

However, the European label landscape is dense, fragmented and constantly evolving. Between national labels, pan-European certifications and sector-specific frameworks, it is difficult to navigate without a rigorous analytical framework. 

It is precisely to meet this need that the experts at WeeFin have designed this guide: a comprehensive comparison of 15 sustainable finance labels, updated for 2026, to help you make informed decisions.

Download the guide for free. Fill in the form opposite to access our full analysis of the 15 European sustainable finance labels.

What you’ll find in this guide:

This guide reviews 15 sustainable finance labels covering the main European markets — France, Germany, Luxembourg, Belgium, Austria and the Nordic countries — and the major product categories: equity, bond, property, microfinance and transition funds.

For each label, you will find a structured analysis: governance, themes, investment universe, criteria to be met...

The labels analysed:

1. ISR label
2. Greenfin
3. FNG-Siegel (classic)
4. FNG-Siegel Transition
5. LuxFLAG ESG
6. LuxFLAG Impact (no focus)
7. LuxFLAG Impact - Climate & Nature Focus
8. LuxFLAG Impact - Social Focus
9. LuxFLAG Microfinance
10. LuxFLAG Transition
11. Towards Sustainability
12. Umweltzeichen UZ 49
13. Relance
14. Finansol
15. Nordic Swan Ecolabel