As a professor, I love it when academic research is front-page news! So, I was delighted yesterday to see a piece there in the Financial Times, Academics accuse Morningstar of misclassifying bond funds (here – subscription required), on Huaizhi Chen, Lauren Cohen, and Umit G. Gurun’s recently posted SSRN article: Don’t Take Their Word For It: The Misclassification of Bond Mutual Funds (here).
The gist of the article is that in deriving its risk classifications/ratings for bond funds, Morningstar’s rating system relies upon self-reported, summary data – often misreported – from bond mutual fund managers about the percentages of funds’ assets in different risk categories (AAA, AAA, B, etc.) rather than using it to supplement the data that those same funds file quarterly with the SEC. The authors explain that assets in equity funds are generally of the same security type (for example, common stock), but that this isn’t true in the case of bond funds, which are “more bespoke and unique” with differences “in yield, duration, covenants, etc. – even across issues of the same underlying firm.” (p.2) And while equity might have about 100 positions, bond funds generally have more than 600 issues. (p.2) So