Tech bubble? Yep, but this VC is investing anyway By: CNBC.com News February 03, 2015 at 11:07 AM EST Joe Horowitz has been in venture capital for three decades, so he knows how to spot a bubble. Too many billion-dollar start-ups is a big sign. Read More >> Related Stocks: Fireeye Inc Gilead Sciences Medtronic Palo Alto Networks Inc Proofpoint Inc