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SolarCity market cap may be difficult to sustain, says Raymond James

Raymond James likens the recent rally in shares of SolarCity to a possible bubble and notes a 180-day IPO lockup expiration looms on June 10. The firm does not advise investors to short the stock, as it continues to like company's business model, but it feels SolarCity may have be challenged to keep the current market cap. Raymond James keeps a Market Perform rating on the name.