Call to Reform Green Bond Lending Gains Momentum

Guest blog by:Michael Stanley-Jones, Senior Advisor, Global PSSL Secretariat

Securities lending involving green bonds poses a rapidly emerging integrity risk with direct implications for sustainability strategy, risk governance, and fiduciary duty. While green bonds are structured to support the climate transition, their unmonitored deployment in lending markets risks undermining that purpose.

Where Environmental, Social and Governance (ESG) mandates or regulatory frameworks require demonstrable environmental alignment, lending without restrictions or oversight these may breach internal policies or regulatory expectations—particularly when green assets are used to finance carbon-intensive short positions.  A short position in finance refers to a trading strategy where an investor sells borrowed securities with the expectation that their price will decrease.

A persistent lack of transparency in secondary market activities—including securities lending, collateral reuse, repurchase agreements (repos), and derivative exposure—not only erodes trust in existing instruments but may also stall the development of future green finance markets.

Global Principles for Sustainable Securities Lending, a not-for-profit Community Interest Company based in Cardiff, Wales UK, has released a call for action paper titled: “Green Bonds Under Opaque Loans: A Call to Pause and Reform Green Bond Lending Practices through Transparent and Fintech-Enabled Solutions.”

This paper identifies a critical transparency gap in current securities lending, repo, and derivatives frameworks — where green-labelled bonds may be used in ways that undermine their original environmental purpose. The paper calls on investors, policymakers, and regulators to introduce greater transparency and stewardship in the post-issuance treatment of green bonds.

Dr. Radek Stech, CEO of Global PSSL & Founder of ABC Score™ said: “This paper offers a constructive contribution to an evolving conversation. As green bonds mature, it is important to ensure that post-issuance practices — including lending and repo — align with their original sustainability commitments.”

Crucially, the paper also proposes a solution: a set of targeted metrics designed to help organisations across the green bond value chain close transparency gaps, build investor trust, and strengthen the integrity of sustainable finance. These metrics are set to be integrated into the upcoming ABC Score™, an AI enhanced governance-oriented tool designed to provide more transparency into the markets. Members of Global PSSL’s Asset Owners Council will support testing of these metrics in the second half of 2025.

Diandra Soobiah, Chair of the Asset Owners Council and Director of Responsible Investment at Nest, a UK public corporation, said: “Nest commends the Global PSSL for shining a spotlight on the role of green bonds in the securities lending value chain. We welcome the report’s recommendations and are pleased to support efforts to improve transparency and understanding of how securities lending might impact the integrity of green bonds.  We look forward to helping test the proposed metrics as part of this important work.”

The lack of transparency and actual, or potential, misalignments between green bonds’ labels and their market behaviour reinforce the urgent need for governance tools such as the ABC Score™. This tool aims to provide a fuller assessment, balance, and calibration opportunities for the green-labelled instruments beyond issuance. 

In contrast to conventional ESG ratings or pre-issuance certifications, the ABC Score™ focuses explicitly on post-issuance practices. While the Score addresses broader themes of market integrity, investor trust, governance and market infrastructure, the present paper focuses on its application to the green bond lifecycle as a particular urgent and illustrative case.

Unlike traditional ESG frameworks, ABC Score™ will enable investors, policymakers, and regulators to follow the money.  By assessing factors such as transparency, alignment with green objectives, and counterparty integrity, the Score aims to help investors, regulators and other key stakeholders monitor potential risks that existing infrastructure models may not capture.

Sarah Wilson, CEO at Minerva Analytics, said: “Data integrity is a critical ingredient for building market trust.  Asset owners are clear that there is no place for greenwashing in any part of their responsible investment strategies. The ABC Score™ framework is a timely market-driven response to supporting a high integrity green bonds market.”

Michael Riggs, Non-Executive Director at the Global PSSL Secretariat, expanded on the role of ABC Score™: “I see the ABC Score™ as a game changer, cutting through the greenwashing that cloaks bad investment practices from public view. The ABC Score™ will give greater transparency to the market.”

Dr Stech explained: “What we have learned over the last few years is that there are many challenges with securities lending and that the potential of ESG has been wasted by those who have used it only as a public relations tool. ... Global PSSL has started work on the ABC Score™ as a tool for increasing transparency in the securities lending value chain. Using artificial intelligence to feed these scores may help to identify certain themes/trends and drive the debate and changes in [market] behaviour.”



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