Smart Money Index (SMI)
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Definition
A cumulative indicator that contrasts intraday market behavior at the open (often emotional/retail-driven) with behavior in the last hour of trading (often institution-driven), aiming to reveal what 'smart money' is doing.
How to read it
The classic construction penalizes the first ~30-60 minutes of the session — when news reactions and retail orders dominate — and credits the final hour, when professionals are thought to position. Accumulated over time, a rising SMI suggests institutional buying pressure into the close, while a falling SMI suggests professional distribution even if the headline index is flat or higher. It is a behavioral/divergence tool: the value of the level is meaningless in isolation; the signal is whether SMI is confirming or diverging from price.
How practitioners use it
Used as context among multiple indicators — never as a standalone signal to act.
Less common professional uses
The headline signal is price/SMI divergence: index at new highs while SMI rolls over suggests the 'smart' cohort is selling the rally — a distribution warning. The open-vs-close heuristic is a proxy, not proof of who is trading; algorithmic close auctions and passive rebalancing have muddied the 'last hour = institutions' assumption, so weight it lightly in modern markets. Cumulative construction means SMI can drift with structural intraday patterns; detrend or compare slope regimes rather than reading the raw cumulative line.
Sources & provenance
Smart Money Index concept (educational overview); Portal desk education notes
This page is educational content published by Pachira Aquatica Global LLC. It is not investment advice and not a recommendation.