VAMI (Value-Added Monthly Index) is a performance metric used to show how a hypothetical sum invested in a fund or strategy would grow over time, assuming all gains, dividends, and interest are reinvested and net of fees.
It begins with a base value (often $1,000) and is adjusted month to month by multiplying by (1 + net return) for that period. Because VAMI shows cumulative returns over time, it helps investors visualize growth trajectories, compare funds, and evaluate how effective fund managers have been.