Wal-Mart, DreamWorks, Sina, Ambac Financial among big market movers Tuesday

Wal-Mart, DreamWorks, Sina among big movers

NEW YORK — Stocks that moved substantially or traded heavily Tuesday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE:

Ambac Financial Group Inc., down 34 cents to $1.12

The bond insurer said its net loss widened because of changes in how it accounted for credit derivatives and other insurance policies.

Wal-Mart Stores Inc., up 98 cents at $53.71

Net income rose 10 percent during the world’s largest retailer’s first quarter, but it said customer volume was dropping in U.S. stores.

Visa Inc., down $4.62 at $70.09

Shares of the credit card company continued to decline after the Senate approved tighter restrictions on debit card fees late Thursday.

Beazer Homes USA Inc., up 26 cents at $5.50

A Citi analyst upgraded the homebuilder, and billionaire hedge fund manager John Paulson bought a stake in the company.

Forest Laboratories Inc., up $1.48 at $27.67

The drugmaker approved a new buyback program for up to 50 million shares of its common stock, effective immediately.

Abercrombie & Fitch Co., down $2.40 at $38.38

The teen clothing retailer narrowed its quarterly loss, but made less money on some sales and posted higher expenses.

DreamWorks Animation SKG Inc., down $2.14 at $34.13

An analyst downgraded the movie studio, saying he expects its “Shrek 4″ movie to bring in less money after a disappointing opening weekend.

NASDAQ:

Sina Corp., up $2.72 at $37.57

The Chinese Internet portal said its quarterly profit rose 150 percent because of stronger advertising revenue.