Nasdaq nears 5,000-does a tech bubble loom? By: CNBC.com News February 24, 2015 at 02:13 AM EST While many start-ups may not justify their lofty valuations at this point, it's not stopping investors from knocking on their door. Read More >> Related Stocks: Alibaba Group Holding Ltd Apple Cisco Systems Facebook Google, Inc. Microsoft Monster Beverage Netflix Oracle Corp Yahoo