How Corporate Complexity Relates to Post Earnings Announcement Drift
Summary
The article summarizes research on whether diversified business groups take longer than single industry firms to have earnings news reflected in share prices. It argues that interpreting segment results is harder when a company spans businesses with different growth rates or cost structures. The proposed mechanism is higher information processing cost, alongside less analyst coverage and lower participation by informed investors. The article describes complexity measures based on segment count, segment growth dispersion, and variation in operating leverage, and frames a long position after unexpectedly strong earnings as a possible application.
The cited study reports stronger post earnings announcement drift for conglomerates, including higher drift among more complex and recently formed groups. It also reports fewer analysts, larger forecast errors, and lower institutional ownership and short interest, and finds that more of the response occurs after the announcement. The evidence comes from historical US data and regression analyses, not a ready to trade strategy. The summary notes caveats around historical results, possible confounding factors, and the costs of analyzing and trading complex firms; it does not establish that the effect persists today or transfers to another market.
Key ideas
- The study links diversified firm structures with slower investor processing of earnings news.
- It measures complexity through segment counts, segment growth dispersion, and differences in operating leverage.
- The reported post earnings drift is larger for conglomerates and for groups with greater measured complexity.
- Conglomerates also have lower analyst coverage and institutional ownership, alongside larger analyst forecast errors.
- The findings rely on historical US data and do not establish current or cross market profitability.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.