Pinterest Inc (NYSE:PINS) stock is down 3.6% to trade at $29.55 at last check, after a downgrade from Jefferies to "hold" from "buy," as well as a price-target cut to $32 from $40. The firm noted the social media platform's new products are unlikely to drive previously implied expected revenue growth, and that the pace of margin expansion may slow after cost optimization efforts. Wells Fargo also lowered its price objective to $39 from $40.PINS is now on track for a fourth-straight loss and biggest single-d ...