NEW YORK (AP) -- Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and Nasdaq Stock Market:
Chesapeake Energy Corp., up 94 cents at $16.52
The natural gas producer is replacing four of its board members, a week after activist investor Carl Icahn took a stake in it.
Delta Air Lines Inc., down $1.33 at $10.18
The airline said that a key measure of revenue rose less than it expected in May as it ran into fare discounting by a competitor.
Smart Balance Inc., up $1 at $7.07
A Canaccord analyst upgraded shares of the food company saying its recent acquisition of a gluten-free food maker will boost growth.
Nathan's Famous Inc., up $1.50 at $26.50
The hot dog seller said that its fourth-quarter profits doubled and its branded product sales jumped more than 26 percent.
Conn's Inc., down 99 cents at $16.72
The retailer said its first-quarter net income more than doubled as prices increased. It also raised its outlook for the year. Shares fell as the broader market stalled.
Credo Petroleum Corp., up $3.49 at $14.35
Real estate and natural resources developer Forestar Group Inc. agreed to buy the oil and gas company for about $146 million.
Medtox Scientific Inc., up $6.98 at $26.68
The medical test service company reached a deal to sell itself to rival Laboratory Corp. of America Holdings for about $241 million.
The Cheesecake Factory Inc., down $1.06 at $30.29
A William Blair analyst downgraded shares of the restaurant operator saying consumers are again pulling away from dining out.