U.S. stock indexes wavered between small gains and losses in morning trading Thursday after several big companies reported disappointing quarterly results or outlooks. Losses in food and beverage stocks and other consumer-goods companies outweighed gains in energy and other sectors. Bond prices fell, sending yields higher. KEEPING SCORE: The Standard & Poor's 500 index was down 1 point, or less than 0.1 percent, to 2,822 as of 11 a.m.