The body governing global sustainable bond market standards has published new guidance on Climate Transition Bonds and released a series of technical updates, as the $7tn sustainable bond market faces growing regulatory complexity across jurisdictions.
The Executive Committee of the Green, Social, Sustainability, Sustainability-Linked Principles and Climate Transition Bond Guidelines — collectively known as the Principles and supported by the International Capital Market Association — announced the publications on 22 June at its Annual General Meeting.
The centrepiece of the release is a frequently asked questions document for Climate Transition Bonds, which aims to clarify how issuers should distinguish between transition and green projects, interpret “best efforts” alignment provisions, and apply the guidelines across issuer types, including those in hard-to-abate sectors, financial institutions and sovereigns.
The Principles also published a comparison between the Green Bond Principles and the European Green Bond Standard, produced by a joint Taskforce on Official Standards. The report identifies commonalities and differences between the two frameworks and encourages issuers to demonstrate alignment with both in order to secure broader investor recognition. The two standards are described as complementary rather than competing.
A third paper examines the structural drivers of investor demand for green, social, sustainability and sustainability-linked bonds, with the aim of helping issuers understand how such instruments fit within investor allocation strategies and engagement practices.
Additional technical updates were released across several existing guidance documents. The Guidance Handbook has been updated to include further questions and answers on Climate Transition Bonds. The Guidelines for External Reviews now draw a clearer distinction between pre-issuance, post-issuance and entity-level evaluation. The Harmonised Framework for Impact Reporting for Green Bonds has been revised to elevate a project’s annual absolute gross greenhouse gas emissions to a core indicator within the energy efficiency and renewable energy categories. The equivalent framework for social bonds has been supplemented with indicators for affordable basic infrastructure projects.
The Principles also announced the renewal of 12 of the 24 seats on its Executive Committee following an annual governance vote.
The standards are developed with input from more than 340 market participants and stakeholders. According to the Principles, the framework was referenced by over 96 per cent of issuers in 2025.
The Principles’ annual conference takes place in Milan on 23 June, where topics including market experience with the climate transition finance label and the relationship between official standards and ICMA guidance are due to be discussed.