Check out the companies making headlines after the bell Thursday:

Alcoa (NYSE: AA) tumbled 5 percent after it missed on the top and bottom lines, with adjusted earnings of 7 cents a share on $5.57 billion in revenue. Analysts had expected the industrial giant to report profit of 13 cents a share on $5.65 billion in revenue.

Gap Inc (NYSE: GPS), which operates Old Navy and Banana Republic stores as well as its namesake brand, said comparable-store sales for the company fell 1 percent in September. The apparel retailer's shares slid 6 percent after hours.

Personal care and household products maker Helen of Troy (NASDAQ: HELE) reported better-than-expected earnings and revenue for the second quarter, sending the company's shares up more about 8 percent in after-hours trading. It also raised the bottom end of its 2016 earnings and revenue guidance.

Restaurant operator Ruby Tuesday (NYSE: RT) posted a surprise fiscal-first-quarter loss of 3 cents a share, versus forecasts for a profit of 5 cents a share. The company met revenue estimates of $279 million and said same-restaurant sales rose 0.6 percent. Share fell more than 5 percent after the bell.

Tribune Media (NYSE: TRCO) said it was exploring the possible sale of its historic Tribune Tower in Chicago. It has hired Eastdil Secured to "begin exploring strategic monetization alternatives" for the 36-story building and the adjacent land. Tribune share were up about 6 percent after the announcement.

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