Stock Screens 

Value investing on solid foundations

Value investing on solid foundations

As the dot.com boom raged, US accountancy professor Joseph Piotroski was exploring a simple and powerful idea that was most out of tune with the obsessions of the time: the pursuit of go-go tech stocks. The idea in question was to screen for cheap stocks with improving fundamentals. The system he devised to do this was executed beautifully and outlined in his acclaimed 2000 paper 'Value investing: The use of historical financial statement information to separate winners from losers'. 

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