Shared Analyst Coverage as a Measure of Momentum Spillovers
Summary
This report summarizes research on momentum spillovers: stocks may react slowly to news about related firms when investors and analysts have limited attention. It presents shared analyst coverage as a general way to define those links. The measure, called CFRET, is the weighted average return of the stocks connected to a given company through shared analyst coverage. The report says this measure can account for several relationship proxies used in earlier research.
The summary reports a lead-lag relationship among stocks with shared analyst coverage. A long-short strategy based on that relationship produced positive five-factor-adjusted alpha in both value-weighted and equal-weighted portfolios. CFRET also reportedly captures much of the predictive ability of other momentum factors, and similar effects appear in international markets. These findings are summaries of historical research, not a complete account of its data, portfolio construction, or trading costs; the report cautions that they are not investment advice.
Key ideas
- Limited investor and analyst attention may delay how stock prices reflect news about related companies.
- CFRET measures a stock’s links to other firms through the weighted returns of companies sharing analyst coverage.
- The report describes lead-lag return patterns among stocks covered by the same analysts.
- It reports positive five-factor-adjusted alpha for long-short portfolios using the shared-coverage signal.
- Similar effects are reported in international markets, but the evidence is historical and does not establish future performance.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.