Are portfolio managers skilled or do they trade too much? Using a marked-to-market based“fair-value” method for measuring fund manager skill, we find that institutional managers canpotentially earn +42 (+33) basis points benchmark-adjusted return before transaction costs aftera holding...

Using a large transaction level dataset, we find that institutional investors can make economically insignificant -4 to 9 basis points net profit on their marked-to-market portfolio of buy – sell transactions over 1-day to 4-week holding period. The negative net marked-to-market profit comes...