[sorbus]

Or very lucky. Or good at spotting trends. Or going out of their way to notice patterns indicative of insider trading on the part of other funds. Insider trading is not the only way to do better than the index.

[xtreegold]

Depends on the timeframe. If you consistently get lucky, you most likely weren't.

[oliveoil]

But I said 'better enough'. There are of course investors that can legally get above the index.