One difference between the tech giants of the dot-com era and tech giants now? Today’s juggernauts really are massive, and not just in the eyes of exuberant investors. That doesn’t mean they don’t present risks.
When the dot-com bubble reached its apex on March 10, 2000, the prices put on that era’s major tech companies made them simply too big to ignore. Microsoft , Intel and Oracle — a group that earned the moniker “the four horsemen” (with Dell Computer sometimes taking Oracle’s place)—accounted for about 13.9 per cent of the S&P 500’s market capitalization.
Among those old favorites, only

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