You think you're diversified. You're just concentrated more efficiently.
Ten tickers are not enough if the risk still sits in a handful of names. High HHI = a portfolio more exposed to single-name shocks. A readable view of concentration helps prevent process mistakes.
You think you're diversified. You're just concentrated more efficiently. If you open many positions but the risk still sits in a few stocks or themes, the problem is not the market: it's how you read the portfolio. HHI shows how concentrated you really are, and a clear view helps you spot overlaps that are easy to miss at a glance. The value is not in making more trades, but in better understanding where risk is concentrated. Has it ever happened to you that you realized too late you were exposed to the same idea all along?
The problem is not how many positions you hold, but where risk accumulates.
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