But only a few stocks — namely mega-cap tech — are responsible for most of the gains , according to analysts. Some analysts, however, believe some parts of the markets are still worth buying. Stock picks In fact, some analysts and portfolio managers recently named stocks that are still cheap, including some in the tech sector. "What's not cheap — our growth stocks and tech stocks and they've had a massive rally here … And those stocks are trading at multiples of in excess of 30 times earnings," he told CNBC's "Street Signs Asia" last week. Look at what's out of favor — value stocks, and particularly cyclical stocks."

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