Buffett Buys IBM; Groupon Gets Sell

IBM(IBM) shares rose 1% to $189.29 in premarket trading Monday after billionaire investor Warren Buffett increased his stake in the company.

Buffett now holds a 5.5% stake in IBM, he said on CNBC.

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Groupon(GRPN) got its first sell rating by Northcoast Research, which gave it a 12-month price target of $15. The daily deals coupon site, which went public earlier this month, saw shares drop 1.3% to $23.95 in premarket trading. Young professionals have picked Google(GOOG) as the most desirable place to work, according to a new survey by employment data firm Universum. Other tech companies which made the top 10: Facebook, Apple(AAPL), Amazon(AMZN), Microsoft(MSFT) and Sony(SNE). Zynga is teaming up with Best Buy(BBY) to sell collectible plush ornaments inspired by items from FarmVille. The social gaming company, which is gearing up for a near-term IPO, is likely trying to develop new sources of revenue. >To submit a news tip, send an email to: tips@thestreet.com.

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