Among the companies with shares expected to actively trade in Tuesday's session are Acadia Pharmaceuticals Inc. (ACAD), ConAgra Foods Inc. (CAG) and Neptune Technologies & Bioressources Inc. (NEPT).

Acadia said its experimental antipsychotic drug showed significant improvement in patients with Parkinson's disease psychosis in a late-stage trial. Patients receiving the drug, pimavanserin, had symptoms like hallucinations and delusions of jealousy reduced by more than a third, compared to a reduction of 18.5% in patients receiving a placebo. Shares nearly tripled to $6.89 premarket from its Monday close of $2.30.

ConAgra has agreed to buy private-label producer Ralcorp Holdings Inc. (RAH) in a deal that will create one of the largest foodmakers in North America, valuing Ralcorp at about $4.95 billion. ConAgra will pay shareholders $90 a share in cash. Ralcorp shares jumped 26% to $88.78 premarket, while ConAgra shares rose 3.9% to $29.40.

Neptune Technologies shares plunged 29% to $2.35 after trading resumed premarket following an extended halt after an explosion and fire at its Sherbroooke, Quebec plant on Nov. 8. The nutritional supplement maker said as it resumes operations, it will temporarily lay off over 70 workers while senior management and employees will take salary cuts of at least 20%.

Corning Inc. (GLW) raised its fourth-quarter sales outlook for its specialty materials business amid stronger-than-anticipated demand for glass used in flat-panel televisions and special glass used in mobile devices. Shares rose 6.8% to $12.12 premarket.

Thor Industries Inc.'s (THO) fiscal first-quarter profit rose 39% as the company reported a double-digit sales gain in its recreational vehicle business. However, shares fell 8.3% to $40 premarket as earnings missed analysts' expectations.

China Ceramics Co. Ltd. (CCCL), a Chinese manufacturer of ceramic tiles, said it has entered into a strategic contract with China State Decoration Group Co. Ltd., a wholly-owned subsidiary of the largest real estate construction contractor in China, China State Construction Engineering Corp. China Ceramics shares rose 18% to $2.65 premarket.

Clean Diesel Technologies Inc. (CDTI) said it received verification from the U.S. Environmental Protection Agency for its Purifilter EGR emission reduction system. Shares rose 16% to $2.50 premarket.

Standard & Poor's said it will add discount chain Dollar General Corp. (DG) to its S&P 500 index, replacing Cooper Industries PLC (CBE), after Eaton Corp. (ETN) completes its acquisition of the electrical products maker. Dollar General shares were up 3% to $50.80 premarket.

Full Circle Capital Corp. (FULL) has launched an offering of 1.35 million shares. The loan financing provider recently had around 6.2 million shares outstanding. Shares fell 4.3% to $7.77 in premarket trading.

Generac Holdings Inc. (GNRC) said its biggest shareholder and members of the company's board and senior management have withdrawn plans for a secondary offering of shares due to market conditions. The generator manufacturer's shares jumped 6.1% to $33.96 premarket.

Las Vegas Sands Corp.'s (LVS) board has approved a special dividend of $2.75 a share, as the casino operator looks to boost shareholder returns. Shares climbed 4.4% to $45.95 premarket.

 
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Children's Place Retail Stores Inc. (PLCE) said Chief Financial Officer Steven Baginski is leaving after less than a year in the post to pursue other interests and will be succeeded by retail veteran Michael Scarpa next month.

Clean Harbors Inc. (CLH) said it is offering 6 million shares, intending to use the proceeds to help finance a planned acquisition. The company had around 53.4 million shares outstanding as of Sept. 30. The provider of environmental, energy and industrial services also said Monday that it plans to offer $550 million in senior notes due 2021.

Dillard's Inc. (DDS) said it will pay a one-time dividend of $5, as the department store operator became the latest in a string of companies to boost shareholder returns before year's end.

Equity Residential (EQR) and AvalonBay Communities Inc. (AVB) are acquiring Archstone Enterprise LP, a portfolio of apartment properties, from Lehman Brothers Holdings Inc. for a total of around $6.5 billion in cash and stock. Equity Residential plans to issue 34.5 million shares to help fund the deal, while AvalonBay said it plans to offer 14.5 million shares.

Merit Medical Systems Inc. (MMSI) agreed to acquire Thomas Medical Products Inc., which is part of General Electric Co.'s (GE) health-care business, for roughly $167 million.

Nexstar Broadcasting Group Inc. (NXST) said stockholders affiliated with ABRY Partners LLC intend to offer 8 million shares. The media company won't receive any proceeds from the sale. ABRY Partners recently owned around 57% of the company's roughly 29 million shares outstanding as of Oct. 31.

Shanda Games Ltd.'s (GAME) fiscal second-quarter profit fell 26% as the Chinese game developer introduced updates with free content, and its revenue fell.

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

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