Shannon Roddel | August 7, 2019
Insight on insider trades is tough to come by, but some mutual fund managers have figured out a way to leverage their networks — and the Securities and Exchange Commission’s EDGAR servers — to better read between the lines when tracking stocks.
New research from the University of Notre Dame found that these tracked insider trades can predict future firm returns, with the stocks bought by a fund manager after a tracked insider buy outperforming other firm purchases.
“IQ from IP: Simplifying Search in Portfolio Choice,” forthcoming in the Journal of Financial Economics from lead author Huaizhi Chen, assistant professor of finance in Notre Dame’s Mendoza College of Business, examined the monitoring behavior of individual institutional investors at companies like Fidelity Investments and Vanguard Group Inc. using web traffic on the SEC’s EDGAR servers from 2004 to 2015.
Chen, along with his co-authors Lauren Cohen of Harvard Business School, Umit Gurun of the University of Texas at Dallas, Dong Lou of the London School of Economics and Christopher Malloy of Harvard Business School, identified which corporate insiders were being tracked based on what trading information portfolio managers downloaded off the site. Using the IP addresses connected with the download, they were able to identify the individual fund managers and compare their portfolio decisions with the behavior of the corporate insider they tracked.
They discovered that when a firm bought after a tracked insider did so, the stock outperformed the firms’ other purchases by an annualized abnormal return of 12 percent rate per year. These abnormal returns do not reverse but continue to accrue in following quarters. And when fund managers opted not to buy or sell when a tracked insider did so, the researchers noted, it implies that those insider trades “should have less predictive ability for future returns.”
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