Make sure to watch shares of Pacific Sunwear of California (PSUN) in Thursday's trading session. The teen apparel company reported a loss in its fourth quarter. The Anaheim, CA-based retailer posted a loss, but the number edged out Wall Street expectations. Revenue for the quarter also topped analysts' forecasts. The company said its better than expected fourth quarter was largely due to its 6% sales increase in stores open more than a year, along with the improvement in its operating results. Shares of PacSun have gained more than 30% year to date. PacSun ended the regular session down, and the stock is even lower in after-hours action following the earnings release. TheStreet's Kurumi Fukushima reports in New York.