(MONEY Magazine) – Swelling assets, which have long plagued small-cap funds, are starting to affect the big guys. To slow inflows, Vanguard raised the minimum investment to $10,000, up from $3,000, on the $41 billion Wellington fund and the MONEY 65's Windsor II, which, at $44 billion, is Vanguard's largest actively managed fund. Barclays lowered costs on 25 iShares sector funds, including Goldman Sachs Natural Resources, to 0.48%.

NOTES: As of April 20. N.A.: Not available. [1] Annualized. [2] Audited and annualized figures except on Fidelity. [3] Includes a waiver. SOURCES: Lipper, New York, 877-955-4773; the fund companies.