ConAgra Foods Inc., the maker of Chef Boyardee and Reddi-wip, is buying the private-label food producer for about $4.95 billion.

Corning Inc., up 78 cents at $12.13

The specialty glass maker raised its quarterly glass market volume forecast as sales of its Gorilla glass near $1 billion.

Thor Industries Inc., down $5 at $38.60

The recreational vehicle maker said that tough competition, discounting and the uncertain economy hurt its first-quarter results.

McMoRan Exploration Co., down $1.47 at $8.18

The oil and natural gas driller said in a drilling update that the development of a key well is taking longer than it hoped.

Las Vegas Sands Corp., up $2.33 at $46.36

The casino operator said that it plans to pay a special dividend of $2.75, distributing about $2.26 billion to its shareholders.

Generac Holdings Inc., up $1.94 at $33.95

The generator maker announced that a secondary offering of 11.5 million shares is being withdrawn due to market conditions.

Nasdaq

Acadia Pharmaceuticals Inc., up $3.13 at $5.43

The drug maker said that its drug pimavanserin reduced psychosis in patients with Parkinson’s disease during a late-stage trial.

Crocs Inc., up $1.14 at $13.49

A Goldman Sachs analyst told investors to buy stock of the plastic shoe maker, saying that the brand is not just a fad.