Among the companies with shares expected to actively trade in Tuesday's session are Yum Brands Inc. (YUM), Idenix Pharmaceuticals Inc. (IDIX) and Hemispherx Biopharma Inc. (HEB).

Yum Brands' fourth-quarter earnings slipped 5.3% as the fast-food chain's same-store sales in China were hurt by negative publicity from a government review of poultry supplies there, though same-store sales in its U.S. business improved. Shares slipped 5.4% to $60.48 after hours as the company said it no longer expects earnings-per-share growth this year due to continued negative same-store sales and its expectation that it will take time to recover consumer confidence.

Idenix said it will discontinue its clinical development program for two of its investigational treatments for hepatitis C, after the U.S. Food and Drug Administration said the treatments would remain on clinical hold. Shares tumbled 19% to 21 cents after hours.

Hemispherx said the U.S. Food and Drug Administration has declined to approve a proposed treatment for chronic fatigue syndrome, saying the company didn't provide sufficient safety or efficacy data. Shares sank 7.7% to 24 cents after hours.

Celldex Therapeutics Inc. (CLDX) is offering $75 million of its stock and net proceeds are expected to be used to fund clinical trials of the drug manufacturer's product candidates and for working capital and other general corporate purposes. Celldex has a market capitalization of about $469 million. Shares fell 3.2% to $7.18 after hours.

Enterprise Products Partners LP (EPD) said it has begun an offering of eight million common units representing limited partner interests. The pipeline company had about 898.8 million units outstanding on Jan. 31. Units declined 2.9% to $54.36 after hours.

Fidus Investment Corp. (FDUS) is offering an undisclosed number of shares and intends to invest net proceeds in lower middle-market companies in line with its investment objective and strategies, and for working capital and general corporate purposes. The management investment company had about 12 million shares outstanding as of Feb. 1. Shares slid 2.3% to $17.59 after hours.

Hologic Inc.'s (HOLX) fiscal first-quarter earnings plunged as the health-products company posted higher acquisition-related charges and other items that masked strong revenue growth. Shares were down 4.1% at $22.30 in after-hours trading as the company projected fiscal second-quarter earnings that missed expectations.

KCAP Financial Inc. (KCAP) is offering 3.8 million shares and intends to use proceeds for general corporate purposes. The company expects to have more than 30.5 million shares outstanding after the offering closes. Shares were off 2.5% to $9.89 after the close.

Rudolph Technologies Inc.'s (RTEC) fourth-quarter income surged on tax-related adjustments and higher revenue. But shares fell 8.3% to $12.25 after hours as the results missed Street expectations.

Silicon Motion Technology Corp.'s (SIMO) fourth-quarter profit fell 35% as the semiconductor-products maker said its sales of LTE transceivers decreased. The company's American depositary shares fell 11% to $13.04 as results fell short of Street expectations, and Silicon Motion gave a downbeat revenue outlook for the current quarter.

Thor Industries Inc. (THO) expects fiscal second-quarter sales that handily topped expectations, amid strong growth in sales of its recreational vehicles. Shares were up 3.7% at $41.29 in after-hours trading.

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Anadarko Petroleum Corp. (APC) swung to a fourth-quarter profit compared with a prior year hit by charges tied to the 2010 Deepwater Horizon oil spill, though revenue declined as energy prices fell.

Baidu Inc.'s (BIDU, K3SD.SG) fourth-quarter earnings rose 36% as the Chinese Internet-search giant posted a double-digit revenue gain.

BRE Properties Inc.'s (BRE) fourth-quarter earnings more than doubled as the real-estate investment trust reported same-store revenue growth and a gain on property sales.

Cigna Corp. (CI) struck a deal with Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB) that will transfer up to $4 billion in obligations pegged to once-troublesome annuity operations that Cigna began winding down more than a decade ago.

Coinstar Inc. (CSTR) said Nelson C. Chan will become chairman of its board, succeeding Deborah Bevier in the latest leadership change at the operator of DVD-rental kiosks.

Edwards Lifesciences Corp.'s (EW) fourth-quarter profit rose 44% as revenue improved across the medical-device company's segments, led by sales of transcatheter heart valves, and the period was also boosted by a tax benefit.

A top digital executive has resigned from Finish Line Inc. (FINL), less than two months after the athletic-goods retailer shuttered a short-lived new website that had design issues, resulting in about $3 million in lost sales.

General Growth Properties Inc. (GGP) swung to a fourth-quarter profit as the mall landlord recorded a smaller accounting adjustment for outstanding warrants in the latest period and as revenue and a key profitability metric improved.

Gilead Sciences Inc.'s (GILD) fourth-quarter earnings rose 15% as the biopharmaceutical company reported double-digit revenue growth, driven mostly by strong sales of its HIV drugs.

Hartford Financial Services Group Inc. (HIG) swung to a fourth-quarter loss as the insurer took a hit from superstorm Sandy, but core results still managed to beat Wall Street expectations.

ICU Medical Inc.'s (ICUI) fourth-quarter earnings fell 31% as the medical-products company's year-earlier results were boosted by an asset-sale gain.

A group of hedge-fund creditors sent J.C. Penney Co. (JCP) a notice alleging the retailer violated the terms of their bonds when it pledged inventory as collateral for a $1.5 billion credit line last year.

Leggett & Platt Inc.'s (LEG) fourth-quarter earnings soared as the diversified manufacturer recorded a tax benefit and margins widened.

MagnaChip Semiconductor Corp. (MX) said some of its stockholders plan to offer five million shares and the South Korea-based chip manufacturer won't receive any proceeds from the sale. The selling stockholders are funds affiliated with Avenue Capital Management II LP, which collectively owned about 38.1% of the company's outstanding stock as of Dec. 31. MagnaChip had more than 35.6 million shares outstanding at the end of 2012.

MDU Resources Group Inc. (MDU) swung to a fourth-quarter loss on a write-down of its oil and natural gas properties, which offset slightly higher operating revenue.

Fitch Ratings lowered its rating on Pitney Bowes Inc. (PBI) to the brink of junk territory, pointing to continued revenue declines and secular challenges facing the mail-and-document services company.

Safeway Inc. (SWY) appointed former J.P. Morgan Chase & Co. (JPM) executive Peter J. Bocian as executive vice president and chief financial officer of the supermarket operator.

Tempur-Pedic International Inc. (TPX) named W. Timothy Yaggi as its chief operating officer, a new position at the mattress company.

Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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