AIG, Washington Post, Crocs, American Public Education among big market movers Friday

AIG, Washington Post, Crocs among big movers

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

NYSE

Assured Guaranty Ltd., up $2.34 at $18.44

The bond insurer posted a profit in the second quarter thanks to investment gains and an acquisition.

PerkinElmer Inc., up $2.24 at $22.29

The medical instruments maker said its quarterly net income more than doubled because of an acquisition, and its outlook topped estimates.

Sotheby’s Inc., up $3.06 at $30.61

The auction house’s quarterly profit jumped past analyst expectations on higher revenue as the art market recovered from the recession.

American International Group Inc., up $1.03 at $40.93

The insurance giant said discussions of a government exit from its huge stake in the company are underway, and its insurance business improved.

Washington Post Co., down $32.41 at $376.20

The newspaper publisher said proposed regulatory changes would have an uncertain effect on its profitable Kaplan education unit.

NASDAQ

Activision Blizzard Inc., down 76 cents at $10.99

The video game maker’s outlook for the third quarter fell short of Wall Street forecasts as sales of its new releases were disappointing.

Crocs Inc., up $1.37 at $13.95

Shares jumped to the highest level in more than two years as improving sales helped the shoe maker return to a second-quarter profit.

American Public Education Inc., down $13.71 at $28.96

The online university company slashed its full-year guidance as military student enrollments dropped.