GURU selects firms using a copycat approach, piggybacking on accomplished stock-pickers. The fund's index looks at published holdings of large hedge funds, focusing on those with concentrated stakes in US-listed securities. Securities selected in this manner are equally weighted. GURU's free-riding method is intuitive and transparent, but basing a portfolio on lagged quarterly snapshots of nimble hedge funds also comes with difficulties. The index is reconstituted annually and rebalanced quarterly.