J.C. Penney and Gap are big market movers

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

NYSE

J.C. Penney Co., down 62 cents to $8.50

The department store operator reported a surprise fourth-quarter loss amid increasing expenses and a disappointing sales outlook.

Weight Watchers International Inc., down $6.23 to $11.33

The weight-loss program operator issued an outlook for this year's profits that fell far below Wall Street's expectations.

Infoblox Inc., up $2.02 to $23.25

The network automation company reported a quarterly loss, but its results adjusted for one-time gains and costs beat Wall Street expectations.

Tetra Technologies Inc., up 99 cents to $5.97

The oil and gas services company posted a fourth-quarter loss, but after eliminating non-recurring costs, its results topped Wall Street expectations.

Gap Inc., up $1.23 to $41.60

The retailer reported stronger-than-expected fourth-quarter results as sales continued to improve for Old Navy, its largest brand.

Nasdaq

Monster Beverage Corp., up $16.38 to $141.12

The energy drink maker reported a boost in fourth-quarter sales and profit, topping Wall Street expectations.

Clean Energy Fuels Corp., up 97 cents to $6.01

The provider of natural gas as an alternative fuel for vehicle fleets reported better-than-expected fourth-quarter results.

Horizon Pharma PLC, up $1.46 to $20.53

The drugmaker reported fourth-quarter results that topped expectations and issued a positive outlook.