Vanguard PRIMECAP (VPMCX)
30-year average annual gain: 12.49%
Vanguard investors speak of PRIMECAP in hushed tones, and they should. Theo Kolokotrones has been with the fund since 1985, and Joel Fried joined him in 1988. The fund ranks in the 4th percentile of the large-cap growth category the past 15 years and sixth for the past 10 years. Alas, the fund is closed to new investors.