After-hours buzz: Potbelly, Zumiez, Zynga & more

Check out which companies are making headlines after the bell Wednesday:

Traders work the floor of the New York Stock Exchange.
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Traders work the floor of the New York Stock Exchange.

WD-40 - Shares dropped after the company reported quarterly earnings that trailed analyst expectations. The home maintenance products maker said it earned 69 cents per share on $96 million in revenue for the fiscal third quarter. Analysts had expected the firm to report earnings of 72 cents per share on $99 million in revenue.

Helen of Troy - The personal products retailer delivered fiscal first-quarter earnings that missed analyst expectations. Shares plummeted after the bell.

Zynga - Shares jumped after the game maker announced that it appointed former Google executive, Regina Dugan, to its board of directors.

Zumiez - The specialty retailer of sports apparel producer said net sales for the month of June increased by 11 percent to $65.3 million. The firm also raised its second quarter guidance. Shares rallied in after-hours trading.

Potbelly - The stock edged lower after the firm issued preliminary second-quarter earnings results. Potbelly said it expects to report a 1.6 percent drop in company-operated same store sales for the quarter.

United Continental - The stock rallied after the airline said passenger revenue growth increased during the second quarter.

Lumber Liquidators - The stock plunged after the company forecast comparable store sales would drop more than 7 percent during the second quarter. It also lowered its 2014 full year outlook.

—By CNBC's Karma Allen

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