Moody's Ratings has recently shifted its outlook for both Golub Capital BDC, Inc. (GBDC) and Blackstone Secured Lending Fund (BXSL) from stable to negative, while upholding their Baa2 long-term issuer and senior unsecured ratings. This revised outlook stems from Moody's assessment of increasing leverage, weaker asset coverage buffers, and a general deterioration in the quality of assets held by these business development companies.

Moody's Issues Negative Outlook on Key Private Credit Funds

On June 2, 2026, Moody's Ratings announced a change in outlook for two significant players in the private credit market: Golub Capital BDC, Inc. (GBDC) and Blackstone Secured Lending Fund (BXSL). This decision, moving from a stable to a negative outlook, underscores growing concerns within the financial community regarding the health and stability of these entities.

For Golub Capital BDC, the rating agency highlighted an elevated leverage position and a less robust asset coverage ratio compared to its peers. As of March 31, 2026, GBDC reported a debt-to-equity ratio of 1.27x and an asset coverage ratio cushion of 19%. These figures are considered less favorable than the median for business development companies, prompting Moody's to reassess its previous upgrade in January 2025, which was based on an expectation of maintaining leverage below 1.25x.

Adding to these concerns, GBDC's asset quality has softened, with non-accrual investments rising to 2.3% of total investments from 1.3% at the end of 2025. This increase was primarily driven by five new non-accrual positions. Moody's also pointed out the company's substantial exposure to the software sector, noting that some of these investments might face increased challenges as their maturity dates approach.

Blackstone Secured Lending Fund exhibited a similar, though more pronounced, trend. BXSL's debt-to-equity ratio stood at 1.32x, with an asset coverage ratio cushion of 17% as of March 31, 2026. This marked the second consecutive quarter that BXSL's leverage surpassed its target range. The deterioration in asset quality was more acute for BXSL, with non-accrual investments soaring to 4.7% from 0.6%, including new additions like Medallia. Furthermore, Moody's flagged a higher prevalence of underperforming credits not yet classified as non-accrual, along with a greater risk of portfolio concentration compared to its industry counterparts.

Despite these negative revisions, Moody's acknowledged the strong structural features common to BDCs that continue to support both companies' ratings. These include a predominantly first-lien and unitranche portfolio, along with diversified exposure profiles. GBDC maintains a first-lien/unitranche share of 92% of its investments, and BXSL also shows a strong orientation towards first-lien assets. Both firms also demonstrate solid liquidity profiles, reinforced by recent debt issuances—$500 million for GBDC and $650 million for BXSL in five-year notes—indicating continued access to capital markets.

The rating agency indicated that the outlooks for both companies could revert to stable if they consistently maintain an asset coverage ratio cushion above 20% and stabilize their asset quality. Conversely, any further decline in leverage, liquidity, or credit performance, particularly sustained weak asset coverage or a rise in non-accruals, could lead to further downgrades. Upgrades would necessitate significantly stronger capitalization, a reduction in leverage below 1.0x debt-to-equity, enhanced funding profiles, and consistent credit performance throughout economic cycles.

This development serves as a critical indicator for investors and stakeholders in the private credit sector, highlighting the increasing scrutiny on financial health and risk management in a dynamic economic landscape.

The decision by Moody's to shift the outlook for GBDC and BXSL raises important questions about the broader health of the private credit market. In an environment where interest rates and economic conditions are constantly evolving, the leverage levels and asset quality of these funds become paramount. This move by Moody's could serve as a wake-up call for investors, prompting them to re-evaluate their exposure to private credit and to demand greater transparency and more robust risk management from fund managers. It also underscores the inherent risks in sectors with high concentration, such as software, which can be particularly vulnerable to market shifts. Ultimately, this serves as a reminder that even seemingly stable investments require continuous monitoring and a keen eye on underlying financial metrics to navigate potential pitfalls.