Among the companies with shares expected to trade actively in Friday's session are Renren Inc. (RENN), Document Security Services Inc. (DSS) and Zoom Technologies Inc. (ZOOM).

Renren's revenue fell while overall expenses surged, driving the Chinese social networking company to a wider loss in the third quarter. American depositary shares of Renren fell 9.9% to $3.02 in after-hours trading as the company's fourth-quarter guidance came in well below expectations.

A subsidiary of Document Security Systems, which develops and integrates security technology, filed a patent lawsuit against Apple Inc. (AAPL). The case centers on patents related to the use of wireless peripheral devices. Shares of Document Security Systems were up 10.6% after hours at $2.08.

China's Zoom Technologies said it agreed to acquire mobile-advertising service Baifen Tonglian Information and Technology Co. Shares of Zoom more than doubled after hours.

 
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The Department of Health and Human Services is going to replace Verizon Communications Inc.'s (VZ) Terremark subsidiary as its web-hosting provider for the federal health-insurance marketplace and replace it with Hewlett-Packard Co. (HPQ), The Wall Street Journal reported Wednesday, citing people familiar with the matter.

Kinder Morgan Energy Partners L.P. (KMP) plans to file an application with Canada's federal regulators on Dec. 16 to nearly triple the size of a pipeline carrying oil to the country's Pacific coast, the head of the company's Canadian subsidiary said Wednesday.

OCZ Technology Group Inc. (OCZ) said that Toshiba Corp. (TOSYY, 6502.TO) has offered to acquire the embattled data-storage company in a planned bankruptcy proceeding, an offer that could stave off a potential liquidation of the company.

The Washington Post Co. (WPO), which will become Graham Holdings Co. (GHC), said it would sell its headquarters building and property in downtown Washington to Carr Properties for about $159 million.

Write to Michael Calia at michael.calia@wsj.com

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