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Antti Petajisto, Ph.D., is a quantitative researcher and portfolio manager, focusing on systematic trading strategies in equities. He is also a former finance professor who has conducted and published research on financial market inefficiencies and selection of money managers.


Dr. Petajisto’s industry experience includes work at hedge funds and asset managers such as BlackRock, LMR Partners, and QuantPort. In these roles he has developed new alpha signals for quantitative portfolios of equities and ETFs, directly managed long-short and long-only portfolios of equities in developed and emerging markets up to several billion dollars in assets, and also built strategies for global tactical asset allocation.


Dr. Petajisto’s academic experience includes work as a finance professor at the Yale School of Management and at NYU Stern School of Business, where he conducted research and taught MBA-level elective courses on investments and portfolio management as well as behavioral finance.


Dr. Petajisto's public research explores topics such as active and passive portfolio management, performance evaluation of money managers, pricing inefficiencies in exchange-traded funds, and the price impact of passive indexing strategies. He also invented the concept of Active Share (building on his Ph.D. dissertation) which today is used by a number of practitioners. His research has been published and cited in academic journals and the popular press, it has won numerous awards, and he has frequently presented his findings to both academic and practitioner audiences.


Dr. Petajisto has a Ph.D. in Finance from MIT Sloan School of Management and M.Sc. in Engineering Physics from the Helsinki University of Technology.