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From 15, the unsystematic risk decreases significantly. So I say 15-25. https://www.finanzmonitor.com/geld-anlegen/aktien-risiko-diversifikation/
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@Dirty30 However, the beta or sectors must also be different. For most of them it will probably be 30-50
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@Dirty30 that was also my initial thought, but the article also states that diversification should be applied to each sector individually and that FX diversification should also be taken into account...
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@Finanzielle-Freiheit That's true, of course. But I wouldn't focus on just 1-2 sectors either. I am also more broadly positioned despite "only" 22 shares.