In five years, the NASDAQ Internet index has risen from 83.80 points to 400.34 points—an increase of more than 475%, reports the New Yorker.

It’s a sign that tech stocks are in a bubble just like the 1990s, says columnist John Cassidy, author of Dot.con: How American Lost Its Mind and Money in the Internet Era.

Read: Give technology to clients

Cassidy has analyzed 20 major stocks, including Amazon, eBay, Expedia, LinkedIn, Google and Netflix. He examined their performance on four major metrics, including their price-to-earnings ratios and price-to-book values.

There’s troubling news for some of the biggest-name stocks. To learn which stocks Cassidy finds are not worth their listings, read more here.

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