After-hours buzz: Barracuda, Gap, Zillow & more

Check out the companies making headlines after the bell Thursday:

Traders work on the floor of the New York Stock Exchange.
Adam Jeffery | CNBC
Traders work on the floor of the New York Stock Exchange.

Gap - The clothing retailer said same-store sales for June fell 1 percent, versus a 2 percent decline during the same period last year. Comparable sales for the company's Gap brand fell 5 percent, while Banana Republic and Old Navy sales rose 1 percent. The stock rose slightly after the announcement.

Barracuda Networks - The security solutions provider beat earnings estimates by a penny, but the stock tumbled more than 17 percent on weak billings figures.

Zillow - Shares declined about 5 percent in light volume after the real estate data site said its chief financial officer, Chad Cohen, resigned. Cohen will remain with the firm through the second quarter. Zillow is searching for a replacement.

Dover - The manufacturer cut its full-year forecasts, citing weakness in the energy markets. Shares were down about 4 percent in thin trading.

Gannett - Shares rose after investor Carl Icahn upped his stake in the publishing firm. As of June 29, Icahn had a 6.5 percent stake in the firm, up from 6 percent earlier, according to a regulatory filing.