Wednesday June 18, 1:20 pm ET BankUnited Financial takes biggest loss on S&P 600 after a pair of downgrades; Panera advances NEW YORK (AP) -- A duo of downgrades of BankUnited Financial Corp. sent shares of the regional bank tumbling nearly a third, making it the biggest decliner on the Standard & Poor's SmallCap 600 Index on Wednesday. The S&P 600 -- which tracks stocks with a market capitalization between $300 million and $2 billion -- fell 2.62 points to 386.60. Small-cap companies make up about 3 percent of the total U.S. securities market, but are often cited as good investments due to their low valuations and potential to grow into big-cap stocks. SunTrust Robinson Humphrey analyst Mac Hodgson downgraded BankUnited to "Neutral" from "Buy" in a client note, while Friedman, Billings, Ramsey's Paul Miller Jr. cut the stock...
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