Transparency & Reporting in the GSS Bond Market

The report finds that while post-issuance reporting in the GSS bond market is widespread and generally high-quality, significant gaps remain in the disclosure of project lifetimes, impact assessment methodologies, and quantitative linkages to entity-level sustainability strategies. Analysis of 75 issuers (USD 1.4tn issued) shows that 88% of 2020–2022 issuers reported allocations, but 35% failed to report within 365 days of issuance. Sovereigns and development banks demonstrated the highest reporting quality, while non-financial corporates were the least likely to provide entity-level framing. The report recommends the adoption of standardized reporting platforms and mandatory regulatory frameworks to enhance market transparency.

• Post-issuance reporting is widespread among GSS bond issuers, though timeliness varies. For bonds issued between 2020 and 2022, 88% of issuers reported allocations and 83% reported both allocations and impacts. However, 35% of issuers failed to report within 365 days of issuance for at least one of their deals.
• Reporting quality varies by issuer type, with sovereigns and local governments often demonstrating best practices in granularity and completeness. Conversely, non-financial corporates were the least likely to include entity-level framing, with 5 out of 12 such issuers failing to disclose this information.
• Project-level disclosure is more common post-issuance than pre-issuance. While only 8% of issuers identified all projects in pre-issuance documentation, 61% did so in post-issuance reports. However, 66% of issuers failed to report project lifetimes for all their projects, which is critical for understanding lifetime impacts.
• Impact reporting remains complex and lacks standardization. Approximately 55% of issuers did not state a methodology for any impact indicator, and about 60% lacked disclosure of baselines. Furthermore, no methane-specific impact indicators were observed in the sample.
• External reviews are used by 63% of issuers, with limited assurance being the most common type (76% of assurances). Most post-issuance assurances only cover allocations; only 21% of assurances also covered impacts.
• There is a significant gap in quantitative linkages between GSS bond impacts and entity-level targets. While 76% of issuers provided some entity-level linkage, only seven issuers provided quantitative data directly linking the two dimensions, and five of those only did so for investment needs rather than sustainability impact indicators.
• The use of science-based taxonomies to determine project eligibility is increasing but remains a minority practice, with only 33% of issuers referencing such taxonomies.

APA

Almeida, M., & Muldoon, C. (2025). Transparency & Reporting in the GSS Bond Market. Climate Bonds Initiative. https://www.climatebonds.net/files/documents/publications/transparency_reporting_in_the_gss_bond_market_February-2025.pdf

Chicago

Almeida, Miguel, and Clodagh Muldoon. Transparency & Reporting in the GSS Bond Market. Climate Bonds Initiative, 2025. https://www.climatebonds.net/files/documents/publications/transparency_reporting_in_the_gss_bond_market_February-2025.pdf.

Wikipedia

{{cite report |last1=Almeida |first1=Miguel |last2=Muldoon |first2=Clodagh |title=Transparency & Reporting in the GSS Bond Market |publisher=Climate Bonds Initiative |date=January 2025 |url=https://www.climatebonds.net/files/documents/publications/transparency_reporting_in_the_gss_bond_market_February-2025.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{almeida2025transparency, author = {Almeida, Miguel and Muldoon, Clodagh}, title = {{Transparency \& Reporting in the GSS Bond Market}}, institution = {Climate Bonds Initiative}, year = {2025}, month = jan, url = {https://www.climatebonds.net/files/documents/publications/transparency_reporting_in_the_gss_bond_market_February-2025.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }