Investigating style-adjusted performance is important for an investor who has selected the desired style and wishes to know which fund or company or portfolio would have provided the best performance within that style. Looking at the entire portfolios provided to clients by different companies...

This paper contrasts the return of Vanguard and Fidelity active stock mutual funds with the style-mimicking portfolio of Vanguard’s index funds. Vanguard’s equally-weighted portfolio of domestic active funds out-returns the portfolio of Vanguard index funds with the same style, as does...