Ally Financial falls after BTIG cuts rating to 'sell'

Consumer lender Ally Financial ALLY.N down 2.9% to $36.8 premarket

Brokerage BTIG downgrades company's shares to "sell" from "neutral"

BTIG is the only brokerage with a "sell" rating among 19 analysts covering the stock

Brokerage has concerns that increased competition will lower company's asset yields and loan volumes, hindering its financial targets

Brokerage says it will be difficult for company to achieve its net interest margin target due to compressing asset yields and insufficient auto loan originations

Earlier this month, company reported that $2.8 bln of low-yielding investment securities were sold as part of a repositioning strategy, which is expected to modestly increase the consumer lender's interest income

Ally Financial's shares rose 5.2% YTD vs 3.5% rise in Dow Jones U.S. Financials index .DJUSFN