"Like any financial asset, a satisfied and engaged workforce is a highly valuable attribute of companies," he said. "Since companies infrequently release internal survey data to investors, public sources of information, like company reviews and third-party 'best of' lists, are proving to be valuable predictive tools of financial performance."
The report analyzed the correlation between company culture and stock price performance using some of the largest public companies named on its inaugural list of the 50 best companies to work for, first released in 2009.
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Stocks of public companies on the inaugural 2009 Glassdoor list were bought in 2009 and held through 2014. This portfolio of companies with high employee satisfaction returned 243.3 percent versus the S&P 500 Index return of 121 percent during the same period.
(Check out Glassdoor's 2015 list of the top 50 companies to work for.)
Additionally, the study looked at 30 publicly traded companies with the lowest overall company ratings. They were evaluated for stock returns. The report shows companies that are lower rated from an employee perspective significantly underperform the market.