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After-hours buzz: Petrobras, YY, Mattress Firm & more

Trader on the floor of the New York Stock Exchange.
Lucas Jackson | Reuters
Trader on the floor of the New York Stock Exchange.

Check out the companies making headlines after the bell Monday:

Shares of Petrobras tumbled in extended trading after Brazil's state-owned energy company posted a fourth-quarter loss of $10.2 billion, according to Reuters.The energy company has long been mired in controversy, with historically low energy prices combining with a nationwide corruption investigation.

The company is investigating practices in its human resources department that may have left the state-run oil producer vulnerable to liabilities, local newspaper Valor Economico reported Monday via Reuters.

YY, a Chinese social network based on voice, video and text, saw its shares pop after it posted quarterly earnings. The company's $293.3 million in revenue during the fourth quarter was driven by mobile revenues to online music and entertainment which grew 452 percent year-over-year, CEO David Xueling Li said in a statement.

Shares of Mattress Firm ticked lower after hours when the company reported lower-than-anticipated quarterly earnings. The bedding company, which recently acquired competitor Sleepy's, posted adjusted earnings of 53 cents per share, the Associated Press reported, below the 56 cents per share expected by Wall Street. It also named a new CEO, Ken Murphy, as part of a long-term succession plan.

Fellow mattress company Tempur Sealy also ticked lower after the news.

South American agricultural company Adecoagro saw shares dip after it announced a public offering of 12 million common shares. The sale by "certain shareholders" will not result in any proceeds to the company and will be underwritten by Morgan Stanley, according to the producer of corn, wheat, soybeans, rice, dairy products, sugar and ethanol.

Among smaller stocks, William Lyon Homes ticked lower a report from the National Association of Realtors showed disappointing existing home resales in February.