As the new year begins, the option-adjusted spread (OAS) on the investment grade corporate bond index has been mildly wider, at 82 basis points (bps), than its recent tight spread of 74 bps. For context, the last time this index traded in the 70s was March of 2005 at 77 bps. At 74 bps, the index was at its tightest level since 1997, when the OAS was at 51 bps.
There are plenty of factors that can affect credit spreads. The most significant one should be, hopefully, the credit quality of the underlying issuers. However, that’s not always the case, a fact that keeps asset managers like us in business.
Underlying credit quality matters, but the stability of that credit quality is just as important. We’ve discussed this concept in the past, but it is worth restating since we believe it’s having an impact on spreads in this environment. Notwithstanding absolute credit quality, the stability of that credit quality actually matters more, according to our analysis. For example, take a given BBB-rated issuer that has been BBB for a long time, has a clear corporate policy to manage the company with that rating (as per its leverage levels) and is expected to have the operational ability to do so. Such an issuer will trade at a tighter spread than other companies with more ratings volatility that may have the same credit rating.
Carry this forward to the wider market and this concept has been a driver of tighter credit spreads. Ratings volatility has fallen, and with it credit spreads. Add to this a too-healthy equity market and absolute yields high enough to pull in buyers, and the OAS on the corporate bond index touches the 70s. We still believe spreads can stay tight given this fundamental backdrop, but equity volatility or rate volatility are at the top of the list of what we think can drive spreads wider.
Source: Bloomberg, 2025.