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Riverbed (RVBD) soared 18% Monday after Piper Jaffray started the networking company's shares at market perform.

Shares rose $3.15 to $21.20 after the brokerage move. Jim Cramer, market commentator and co-founder of

TheStreet.com

, made

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bullish comments about the stock on his Mad Money television show Friday. Cramer, noting the strong action in three IPOs last week, urged investors to look for recent IPOs in hot sectors.