Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and Nasdaq Stock Market:
Tyson Foods Inc., down $1.14 at $17.75
The meat processor's quarterly profit was flat as higher feed costs offset improving demand and higher meat prices.
Sysco Corp., up $3.06 at $31.57
The nation's largest restaurant food distributor's quarterly profit rose 4 percent, beating expectations of Wall Street analysts.
Citigroup Inc., up $39.64 at $44.16
The bank's reverse stock split went into effect, raising share prices by 10 times, but the stock fell throughout the day.
Dollar Thrifty Automotive Group Inc., up $9.58 at $79.27
Hertz raised its bid for the car rental agency, topping rival Avis Budget's offer, in the year-long fight for Dollar Thrifty.
McDonald's Corp., up 61 cents at $79.31
Sales of shakes, coffee drinks and breakfast food helped a key revenue measure at the hambuger chain rise 6 percent in April.
Nuance Communications Inc., up $1.67 at $21.76
A TechCrunch report fanned market rumors that Apple was interested in a partnership with the voice recognition technology maker.
Staples Inc., down 63 cents at $20.26
A Nomura analyst said the entire office supply sector faces pressure. He downgraded and cut his price target on its shares.
PetMed Express Inc., down $1.58 at $13.14
The operator of the 1-800-PetMeds online pet pharmacy said quarterly profit dropped after it cut prices and spent more on ads.