What is the difference between a hedge fund and a mutual fund?

Mutual funds are open to anyone, tightly regulated and can be sold any day. Hedge funds are private, open only to wealthy investors and institutions, can use far riskier strategies, charge more, and lock up investors' money for longer.

Mutual fundHedge fund
Who can investAnyoneAccredited investors and institutions
RegulationRegistered under the Investment Company ActExempt from it; its adviser is usually registered
StrategiesMostly long stocks and bonds, with limits on borrowing and shortingAlmost anything: shorting, leverage, derivatives
FeesA yearly fee, often well under 1%A yearly fee plus a share of profits
Getting money outAny business dayMonthly or quarterly, after a lock-up
DisclosurePublishes its full holdings regularlyOnly its long US holdings, in its 13F

The large mutual fund companies also file 13Fs, and HedgeFollow tracks them among all institutional investors.