From MARKET TALK:

0848 GMT [Dow Jones] US stocks are set for a weaker start Tuesday after the S&P 500 recorded a new all-time closing high in the previous session, says Matt Basi, head of UK sales trading at CMC Markets. Calls the DJIA down 10 points at 14,809 and the S&P 500 two points lower at 1592. Says investors are likely to await the next catalyst to propel stocks higher. At 1300 GMT, S&P/Case-Shiller home price index, at 1345 GMT Chicago PMI data and at 1400 GMT consumer confidence data. Earnings from Pfizer and NYSE Euronext will also garner attention. The DJIA front month futures contract is currently flat at 14752.00 and S&P 500 futures contract is down 0.1% at 1587.00. (nina.bains@dowjones.com)

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HOT STOCKS TO WATCH

Among the companies with shares expected to actively trade in Tuesday's session are Riverbed Technology Inc. (RVBD), HeartWare International Inc. (HTWR) and Neostem Inc. (NBS).

Riverbed Technology 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 6.8% to $13.84 after hours.

HeartWare's 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. Shares rose 7.2% to $91.60 after hours as per-share earnings results topped consensus estimates.

Biotechnology services company Neostem revealed plans to offer stock, but didn't say how many shares it plans to sell. Shares fell 11% after hours to 56 cents.

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. Shares jumped 8.3% to $11.20 in after-hours trading Monday, as the company offered second-quarter revenue guidance above analyst expectations.

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 2.4% to $25.42 in after-hours trading.

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. Shares climbed 6.9% to $22.80 after hours.

Watch List:

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.

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.

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.

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 Nathalie Tadena at nathalie.tadena@dowjones.com

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