Katie Benner, Columnist

Feeling Nervous About a Biotech Bubble?

Those soaring biotech stocks raise questions about valuations in every industry.

Will some of these bubbles burst? Photographer: E+ via Getty Images

Source: E+ via Getty Images
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A biotechnology bubble appears to be upon us.

The Nasdaq Biotechnology Index is hovering above 3,500. That’s more than double the level it hit 15 years ago, when investors piled into anything tech-related and got burned. The index fell from that high point and didn't begin soaring again until the late summer of 2011.