NEW YORK (TheStreet) -- As the Dow and S&P 500 continue to make new highs, Wall Street appears even more on edge. Recently joining the list of pessimists is hedge-fund superstar David Einhorn, who insists "we are witnessing our second tech bubble in 15 years."
Einhorn's chief concern is on stock prices, believing investors have rejected "conventional valuation methods." He stopped short of identifying which companies fit the bubble criteria. But one thing is certain, it's unclear what will pop it.
To that end, here are five companies (in no particular order) that have not participated in the bubble. Not only have they recently reported solid earnings results, they have the fundamental metrics to back their valuations, which still points to higher highs.
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