ESG Bonds Make Up Smallest Share of Corporate Debt Since 2020

The share of corporate debt issued globally by non-financial companies with an ESG label, encompassing green, social, sustainability, and sustainability-linked bonds, has fallen to its lowest level since 2020, now comprising just 5.7% of the total in 2025, according to Bloomberg data. This significant decline signals a notable slowdown in the ESG bond market, impacting broader corporate debt trends.

Analysis

The market for ESG-labeled debt is experiencing a significant contraction, with its share of global corporate issuance from non-financial companies falling to just 5.7% in 2025. This figure marks the lowest level of penetration since 2020, according to Bloomberg-compiled data, signaling a clear slowdown in what has been a high-growth segment of the credit market. The decline encompasses a broad range of instruments, including green, social, sustainability, and sustainability-linked bonds. This trend suggests a potential cooling in either corporate appetite for issuing such debt or investor demand, representing a notable reversal from the rapid expansion seen in previous years and impacting flows within the sustainable finance ecosystem.

Key Decisions for Investors

• Investors with dedicated ESG mandates should anticipate a potentially tighter supply of new issues and may need to reassess the liquidity and valuation of existing holdings in this contracting market.
• Portfolio managers should evaluate whether this slowdown represents a temporary market fluctuation or a more structural shift in corporate financing priorities and investor sentiment towards ESG labels.
• Monitor for a potential valuation disconnect between ESG-labeled bonds and conventional corporate debt, as the waning issuance could alter historical pricing premiums and create tactical opportunities or risks.