U.S. high-yield bond issuance hits yearly high in September

The U.S. high-yield bond market saw a massive surge in supply during September, reaching $38.51 billion, the highest monthly total this year. This influx of corporate debt, driven by large-scale issuances from entities such as SoftBank Group and Paramount Skydance, has led to concerns regarding market indigestion.

As a result of the heavy supply, credit spreads—the additional yield investors demand over risk-free Treasury rates—have widened to a five-month high. The average spread for high-yield bonds reached 294 basis points, while the spread for the lowest-rated CCC bonds hit 968 basis points, the highest level since November 2023.

Goldman Sachs credit strategist Amanda Lynam noted that the market is experiencing a period of fatigue similar to what was seen in the investment-grade market earlier this summer. While higher yields may attract some investors, extreme volatility could dampen sentiment and delay new purchases.

Additionally, debt issuance related to artificial intelligence initiatives has contributed to the supply pressure. Goldman Sachs estimates that global bond issuance for AI-related projects reached approximately $600 billion this year, with hyperscalers accounting for about 40% of that total. Lynam suggested that the peak for AI-related bond supply may have passed in 2026, with a potential acceleration in issuance starting in 2027.