Movers: Citigroup, Mastercard, Visa, Merck, Energizer, Gildan Activewear

Citigroup (C) said it will sell at least $3 billion in common stock to shore up its capital position. Citi shares fell 3% to $25.52 in after-hours trading. Mastercard (MA) posts $3.38, vs. $1.57, first quarter GAAP EPS on 29% higher net revenue. Says...