The Lean 20 is a list of lean companies suggested by readers of Evolving Excellence and Superfactory. The Lean 20 Average is a simple average of the year to date performance of each company, which can be compared to the S&P 500.
LeanStocks.com grew out of the Superfactory 20 project on the Superfactory website and Evolving Excellence blog, which attemped to identify lean manufacturing companies and determine the effect of lean on stock price performance.