Shares of UnitedHealth Group ( UNH -5.75%) plummeted again on Wednesday. The company's stock is down 5.8% as of market close, while the S&P 500 ( ^GSPC -1.61%) and the Nasdaq Composite ( ^IXIC -1.41%) ...

The Dow's biggest drag was shares of UnitedHealth Group Inc., (UNH) which fell 5.8% after HSBC cut its rating on the stock to reduce, a month after downgrading it to hold. The bank also slashed its ...