Donald Smith

Donald Smith has managed Donald Smith & Co. for over 40 years, applying one of the most rigidly consistent deep value investing approaches in the industry. The firm systematically screens for stocks trading at the lowest price-to-book value ratios globally — typically buying the bottom decile of P/B stocks — based on the principle that deeply undervalued companies tend to outperform over time as mean reversion occurs. This highly quantitative approach excludes the financial sector and other areas where book value is less meaningful. The consistency of the approach, maintained through decades of changing market conditions, makes Donald Smith & Co. one of the clearest examples of academic factor investing implemented in practice over an extended period. The firm's willingness to maintain this disciplined approach through extended periods when deep value underperformed — including the 2010s growth stock dominance — reflects the kind of institutional conviction that separates systematic investors from those who abandon their process at the first sign of headwinds.