Apple and DR Horton are big market movers

NEW YORK (AP) -- Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:

NYSE

Allegheny Technologies Inc., up $2.32 to $30.95

The specialty metals company sold its tungsten materials unit for $605 million as it focuses on growth opportunities in its high-performance metals and flat-rolled products segments.

DR Horton Inc., up 70 cents to $19.84

The withdrawal of Lawrence Summers from the race for the top job at the Fed sends shares of homebuilders soaring. Summers was expected to rein in some of the measures that have kept interest rates low.

The Boeing Co., up $4.34 to $115.67

Sterne Agee raises its price target on the plane builder's stock, citing healthy forecasts for aircraft deliveries.

Boise Inc., up $2.60 to $12.56

Packaging Corp. of America is spending $1.27 billion to acquire the maker of packaging and paper products.

Nasdaq

Omeros Corp., up $3.47 to $8.56

Wedbush hikes its target price for the biopharmaceutical company on the belief that a shifting regulatory landscape will lead to increased use of the company's OMS302, a treatment for the eyes.

Apple Inc., down $14.78 to $450.12

Concerns about early demand for the newest iPhone hit the stock, which has dropped 11 percent since the company's product announcements last week.

Perion Network Ltd., down $1.43 to $11.74

Investors were not happy about the premium offered for the consumer Internet company in a tie-up with Conduit Ltd.'s Client Connect business.

Regado Biosciences Inc., up $3.03 to $7.63

A host of analysts initiate coverage of the biopharmaceutical company that has a drug showing blockbuster potential in late-stage clinical trials.