Home / BusinessCNBCBusinessCNBC·Jul 21, 2026·1 min readThe worst dotcom bubble investing mistakes are coming for your portfolio. Avoid themInvestors can learn from the mistakes that sank stock portfolios in the early 2000s dotcom crash when many became overly concentrated in the technology sector.View original source — CNBC ↗ShareCopy linkShare on XShare on FacebookRelated storiesSBS NewsBusinessJul 21, 2026 · 1 minGlobal oil supplies have a new possible pinch point. Here's what could happen nextSBS NewsBloombergBusinessJul 21, 2026 · 1 minRobinhood Prediction Market Revenue to Top Crypto, Analysts SayBloombergRio TimesBusinessJul 21, 2026 · 1 minWEG Q2 Preview: Analysts See an 8% Profit DipRio TimesCNBCBusinessJul 21, 2026 · 1 minApple prepares a new way to buy iPhones. Plus, making sense of Google's new AI modelsCNBC
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