In 2000, internet darling Cisco was the world’s most valuable company. Today it's worth half as much. AI juggernauts like Nvidia and Palantir are driving the tech-bloated S&P 500 today. Buyer beware.Read the full story on Forbes: https://www.forbes.com/sites/hanktucker/2025/08/25/why-ai-stocks-are-giving-some-investors-dotcom-bubble-dj-vu/ Subscribe to FORBES: https://www.youtube.com/user/Forbes?sub_confirmation=1 Fuel your success with Forbes. Gain unlimited access to premium journalism,