Among the companies with shares expected to actively trade in Thursday's session are K12 Inc. (LRN) and Pall Corp. (PLL).

K12 swung to a fiscal fourth-quarter profit as the online-education provider again benefited from high demand for online classes. Shares climbed 9.9% to $23.50 premarket as analysts had expected the company to post a loss and as revenue beat Wall Street estimates.

Pall's fiscal fourth-quarter profit fell 11% as the maker of filtration and purification products reported heavy restructuring charges, masking a modest improvement in sales. Shares jumped 7.3% to $62.40 premarket on the better-than-expected results.

Biopharmaceutical developer Vical Inc.'s (VICL) shares rose 12% to $4.22 premarket after the company said it was licensing its DNA immunization technology to drug giant Bristol-Myers Squibb Co. (BMY). Financial terms of the agreement weren't disclosed.

Chesapeake Lodging Trust (CHSP) is offering 5.5 million shares as the real-estate investment trust looks to raise funds to repay debt and for general corporate purposes. The company had 32.1 million shares outstanding as of Aug. 1. Shares slipped 2.8% to $18.45 premarket.

Genesee & Wyoming Inc. (GWR) unveiled an offering of 3.5 million shares of its Class A common stock, which includes 233,996 shares being offered by the company's chairman and two million tangible equity units. The company had 40.7 million Class A shares outstanding as of July 31. Shares fell 5% to $64.56 premarket.

InContact Inc. (SAAS) intends to offer common stock, but didn't say how many shares it would sell. The company, which provides voice and call-management services, had about 44.5 million shares outstanding as of July 24. Shares were down 4.4% to $4.95 premarket.

Pluristem Therapeutics Inc. (PSTI) said it plans to offer an unspecified number of shares of common stock and warrants to purchase common stock. The Israel drug developer had about 47.5 million shares outstanding as of Sept. 1. Shares declined 14% to $3.91 premarket.

 
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DST Systems Inc. (DST) said Chief Executive Thomas McDonnell is retiring at the end of the year and named Stephen Hooley, currently the information-technology company's president and chief operating officer, as his successor.

HollyFrontier Corp. (HFC) will pay shareholders an additional special dividend of 50 cents a share for the third quarter, in the refiner's latest move to reward its investors.

Nexxus Lighting Inc. (NEXS) unveiled a $6 million investment from Aston Capital LLC and said the private-equity firm's Chairman and Chief Executive Robert LaPenta will become Nexxus's new chairman.

Nordion Inc. (NDZ, NDN.T) is shaking up its management team as the medical-technology company said it is realigning its operations into two distinct business units.

Pervasive Software Inc.'s (PVSW) board has instructed its financial adviser to solicit and discuss potential acquisition offers, including an unsolicited bid of $154 million made last month by Actian Corp.

RailAmerica Inc. (RA) said carload traffic increased 2.9% in August from a year earlier, driven in part by shipments of crude oil and refined petroleum.

The U.S. Food and Drug Administration Wednesday approved a Sanofi SA (SNY, SAN.FR) pill to treat multiple sclerosis, making it the second oral therapy that will be available on the U.S. market.

Spartech Corp.'s (SEH) fiscal third-quarter earnings fell 39% as the company posted weaker revenue in its packaging-technologies and color and specialty-compounding businesses. Results missed analyst expectations.

Two Harbors Investment Corp. (TWO) cut its quarterly dividend by 10%, but the real-estate investment trust said it continues to believe the housing and mortgage sectors offer attractive investment opportunities.

Write to Anna Prior at anna.prior@dowjones.com

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