Among the companies with shares expected to actively trade in Tuesday's session are Best Buy Co. (BBY), UBS AG (UBS, UBSN.VX) and Nuance Communications Inc. (NUAN).

Electronics retailer Best Buy is selling its 50% interest in Carphone Warehouse Group PLC's (CPW.LN) Europe business back to Carphone Warehouse in a mostly cash deal valued at about $775 million. The sale marks Best Buy's final step to unwind a costly and unsuccessful 2008 joint venture with the U.K.-based mobile-phone chain that it launched to expand into Europe as its U.S. sales began to stagnate. Best Buy shares rose 4.1% to $25.20 premarket.

Switzerland's biggest bank, UBS, posted a better-than-expected first-quarter profit Tuesday as the bank pushes through an extended restructuring program in the wake of the financial crisis. Shares rose 7% to $17.97 premarket.

Nuance Communications swung to a second-quarter loss, logging results below Street views, as the speech-software maker also disclosed a $500 million stock-buyback effort. "We are disappointed with our results for the second quarter, which were driven by a combination of execution issues and external factors," said Chief Executive Paul Ricci. Shares fell 12% to $20.45 premarket.

Drug maker Pfizer Inc.'s (PFE) first-quarter earnings rose 53% from a year-earlier period weighed down by charges, but results fell short of Wall Street expectations, as sales of top products declined on losses of exclusivity and other headaches. The company also reduced its financial outlook for the year, citing unfavorable currency trends. Shares fell 3.3% to $29.42 in premarket trading.

Avon Products Inc. (AVP) swung to a first-quarter loss as the door-to-door cosmetics vendor recorded charges related to restructuring, extinguishment of debt and the devaluation of Venezuelan currency, though adjusted earnings beat Wall Street expectations. Chief Executive Sheri McCoy said she is pleased with the performance of the company's Latin America and Europe, Middle East & Africa regions, particularly in Brazil and Russia. Shares rose 7.8% to $23.98 premarket.

Pitney Bowes Inc.'s (PBI) first-quarter earnings sank 57% as the mail-and-document-services company continued to post revenue declines amid weaker demand for mail. The company also cut its second-quarter dividend to 18.75 cents a share from 37.5 cents in the prior quarter. Shares fell 7.7% to $14.95 premarket.

Riverbed Technology Inc. (RVBD) swung to a first-quarter loss as acquisition costs and feeble government spending hurt the network-equipment maker's performance. The San Francisco company also surprised investors with lower-than-expected sales of its main wide-area network optimization product, which helps large organizations shuttle data between head offices and smaller branch offices. Shares were down 6.1% to $13.95 premarket.

Transition Therapeutics Inc. (TTHI) said results of a five-week proof of concept clinical study of its TT-401 treatment in type 2 diabetic and obese non-diabetic subjects demonstrated significant improvements in glycemic control and reductions in body weight. Shares rose 31% to $2.95 premarket.

Biotechnology services company Neostem Inc. (NBS) revealed plans to offer stock, but didn't say how many shares it plans to sell. Shares fell 22% premarket to 49 cents.

Northern Tier Energy LP (NTI) said Northern Tier Holdings LLC is offering 10 million units, decreasing its stake to 55.4% from 66.3%. The energy company's units were off 3.4% to $25.15 in premarket trading.

 
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Standard & Poor's Ratings Services lowered its rating on Allscripts Healthcare Solutions Inc. (MDRX) by one notch, citing product-integrations issues and declining sales at the electric health-records company.

Arch Capital Group Ltd.'s (ACGL) first-quarter earnings rose 56% as the insurance and reinsurance company saw its premiums and its foreign-exchange gains rise.

A New York State judge denied summary judgment Monday to Bank of America Corp.(BAC) and MBIA Insurance Corp. (MBI) in a longstanding battle over who is liable for losses racked up after the collapse of the housing market.

Cablevision Systems Corp. (CVC) has agreed to sell the bulk of its Clearview Cinemas movie theaters to privately held Bow Tie Cinemas as it continues to shed non-core businesses. Terms of the deal weren't disclosed.

Community Health Systems Inc.'s (CYH) first-quarter earnings rose 4.9% as the hospital operator benefited from slightly stronger revenue despite weaker admissions.

Datalink Corp.'s (DTLK) first-quarter earnings fell 49% as operating expenses at the provider of data-center infrastructure and services increased, offsetting stronger revenue that was helped by an acquisition, although core earnings improved. The company offered second-quarter revenue guidance above analyst expectations.

Express Scripts Holding Co. (ESRX) said Monday its first-quarter earnings rose 39%, fueled by last year's Medco Health Solutions deal, and the company slightly increased its full-year earnings outlook.

General Growth Properties Inc.'s (GGP) first-quarter loss narrowed as the mall landlord posted lower warrant liability adjustments and a gain on the extinguishment of debt, while revenue rose.

Hartford Financial Services Group Inc. (HIG) swung to a first-quarter loss as the insurer booked charges tied to its transformation into a more-focused company.

HeartWare International Inc.'s (HTWR) first-quarter loss narrowed on U.S. sales of its implantable heart pumps. The latest period marks the first full-quarter of U.S. commercial sales of its HeartWare Ventricular Assist System, which is a bridge-to-transplant therapy for patients with advanced stage heart failure. Per-share earnings results topped consensus estimates.

Helen of Troy Corp.'s (HELE) fiscal fourth-quarter earnings rose 7.5% as the personal-care and household-products maker posted sales growth across its segments.

Herbalife Ltd.'s (HLF) first-quarter earnings rose 9.9% as the nutritional-supplements maker posted double-digit sales growth. Per-share earnings topped Herbalife's expectations and the company again raised its full-year earnings view.

Hertz Global Holdings Inc. (HTZ) swung to a first-quarter profit, as the car-rental company's sales were boosted by the recent purchase of Dollar Thrifty Automotive Group. Results easily exceeded Wall Street's expectations, as both the car and equipment rental segments benefited from stronger volumes and better pricing.

Hydrogenics Corp. (HYGS, HYG.T) said it intends to offer an undisclosed number of shares, using the proceeds for general purposes.

Macquarie Infrastructure Co. LLC (MIC) said it is offering 3.04 million shares, while Macquarie Investment Management, which owns a 12% stake in the company, is offering 2.49 million shares. The energy infrastructure owner, which recently had around 37.6 million shares outstanding, expects to use its portion of the proceeds to pay down debt.

Masco Corp.'s (MAS) first-quarter profit rose 42% as the building-products manufacturer benefited from robust new-home construction in North America. However, results missed analyst expectations.

Meritor Inc. (MTOR) has agreed to sell its 50% ownership stake in a Brazilian joint venture to its joint-venture partner Randon SA Implementos e Participacoes for $195 million, and plans to use proceeds to strengthen its balance sheet.

Newmont Mining Corp.'s (NEM) first-quarter profit fell 36% as the gold-mining company reported that its gold production declined.

New York hedge fund Jana Partners LLC disclosed a 9.1% stake in Oil States International Inc. (OIS), calling the diversified oilfield services company's shares undervalued.

PartnerRe Ltd.'s (PRE) first-quarter earnings fell 35% as the reinsurer posted sharply lower realized and unrealized investment gains. However, excluding those impacts, operating profit was up more than expected.

Plum Creek Timber Co.'s (PCL) first-quarter earnings almost doubled as the real-estate investment trust posted wider margins.

Post Properties Inc.'s (PPS) first-quarter earnings slipped 7% as a gain from the sale of real-estate assets boosted the real-estate investment trust's year-earlier results, though revenue and funds from operation improved in the latest period.

Qiagen NV's (QGEN) first-quarter earnings fell 30% mostly on higher business integration expenses and other items as the medical-testing technologies company also said it acquired privately held software company Ingenuity Systems Inc. for $105 million, expanding its capabilities in genetic data analysis and interpretation--a key growth area in the sector.

Safeway Inc. (SWY) has named President Robert L. Edwards to succeed Steven A. Burd as chief executive when Mr. Burd retires next month.

Texas Roadhouse Inc.'s (TXRH) first-quarter earnings rose 39% as the casual steakhouse operator opened new restaurants, and sales increased at its existing locations.

Time Warner Cable Inc. (TWC) named Arthur T. Minson Jr. as its new chief financial officer, effective May 2, replacing Irene M. Esteves.

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

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