Yan, LuTo aid investors in assessing earnings persistence, managers often voluntarily provide non-GAAP disclosure, which excludes certain items they characterize as non-recurring from GAAP earnings. The quality of non-GAAP disclosures and their impact on the equity market have been well studied. By contrast, there is little evidence on the impact of these disclosures in the debt market. Credit rating agencies (CRAs) serve as gatekeepers in the debt market, playing an important role in evaluating creditworthiness by actively incorporating accounting information from corporate disclosure. Like shareholders, CRAs also seek to isolate the transitory component of GAAP earnings. For example, Moody’s (2006) and Standard & Poor’s (2008), the two largest rating agencies, state that they derive their credit ratings from adjusted accounting figures by excluding non-recurring items that do not reflect long-term credit risks. Thus, in this paper, I explore the possibility that managers’ non-GAAP disclosures are relevant to CRAs. Consistent with CRAs’ emphasis on long-horizon corporate performance, I provide evidence that CRAs exhibit stronger responses to non-GAAP earnings than GAAP earnings. Using mediation analysis, I find that bondholders rely on CRAs to incorporate earnings information, and such reliance is notably greater for non-GAAP earnings than GAAP earnings. While CRAs do not specifically emphasize the direction of exclusions (i.e., gains or losses), they are attentive to identifying high-quality non-GAAP disclosure, as evidenced by the more positive associations observed between their credit ratings and high-quality non-GAAP earnings. I further find that non-GAAP earnings outperform GAAP earnings for non-GAAP reporters in their predictive power for long-term bankruptcy and default risks, validating CRAs’ motivations to incorporate non-GAAP earnings when assigning credit ratings. Finally, managers appear to be aware of CRAs’ utilization of their non-GAAP disclosure and are thus inclined to offer high-quality but conservative non-GAAP metrics to either achieve or maintain higher ratings when approaching rating upgrades or downgrades. My findings collectively suggest that CRAs view non-GAAP metrics as more relevant tools when evaluating borrowers’ long-term performance and default risks, serving as key intermediaries between non-GAAP reporters and bondholders.enDissertationAccountingBondsCredit Rating AgenciesMediation AnalysisNon-GAAP Disclosure