Among the companies with shares expected to actively trade in Wednesday's session are Mediware Information Systems Inc. (MEDW), Xyratex Ltd. (XRTX) and Globecomm Systems Inc. (GCOM).

Private equity investment firm Thomas Bravo LLC agreed to buy health-care-software maker Mediware Information Systems for about $194.6 million in cash as it looks to expand its stake in the fast growing health-care technology sector. Under the terms of the deal, Mediware shareholders will get $22 a share, a 40% premium over the company's Tuesday close. Shares up 39% to $21.82 premarket.

Xyratex lowered its fiscal third-quarter revenue expectations, pointing to reduced demand from large customers in its core enterprise data-storage division and deferrals in meeting acceptance testing criteria for its latest products. The storage-systems provider's shares sank 16% to $9.00 premarket.

Globecomm's fiscal fourth-quarter earnings more than tripled as infrastructure revenue at the provider of satellite-based communication services increased, though service revenue and margins weakened. Shares plummeted 19% to $10.72 premarket as the company forecast results for the new fiscal year below analyst expectations.

American depositary shares of the National Bank of Greece SA (NBG, ETE.AT) traded 12% higher premarket to $2.51 amid Germany's highest court throwing out attempts to delay the country's ratification of the European Stability Mechanism and the so-called "Fiscal Pact", a move which removes a major question mark over two crucial elements of the euro zone's plan to manage its debt crisis. The Greek bank also received a boost from Greece's state privatization agency Tuesday which approved a memorandum of understanding with the bank--owner of the luxury Astir Palace hotel in an upscale coastal suburb south of Athens--to jointly develop the property.

Paccar Inc. (PCAR) expects third-quarter production of its commercial trucks to be lower than previously forecast, providing fresh evidence that demand for trucks in the U.S. is likely to remain weak into the fall. The company says truck production will be 15% to 20% below the second-quarter's production level, compared to its previously predicted 10% decline. Shares of the maker of Kenworth and Peterbilt-brand trucks fell 2.5% to $40.65 premarket.

Chinese video-sharing web portal Youku Tudou Inc. (YOKU) was started at a buy by Citi. The firm said Youku has strengthened to its top position in video content and user traffic through its merger with Tudou, and that in China, the Internet has become the most important media platform. American depositary shares were up 7% to $19.10 in premarket trading.

Steel Dynamics Inc. (STLD) expects third-quarter earnings to come in far short of Street expectations, as the steelmaker sees shipments falling. Shares of the company fell 3.2% in premarket trading to $11.89.

Facebook Inc. (FB) Chief Executive Mark Zuckerberg made his first public comments since his firm's flawed initial public offering of stock on Tuesday, and acknowledged that his diminished stock price might encourage some employees to leave. Shares were up 6.2% to $20.61 premarket.

China biotechnology company 3SBio Inc. (SSRX) said its board received an offer to take the company private for a 29% premium over its closing price on Tuesday. The offer, for $15 per American depositary share, came from the company's chairman and chief executive, Jing Lou, and a fund associated with Citic Private Equity Funds Management Co., a Chinese private-equity firm with about $5 billion in assets under managements. Shares up 20% to $13.90 premarket.

Santarus Inc. (SNTS) said an advanced study of an investigational antibiotic met its primary endpoint in treating travelers' diarrhea. Shares jumped 6.3% in premarket trading to $8.29.

Teekay Offshore Partners LP (TOO) plans to offer roughly seven million of its common units, representing limited partner interests. The provider of marine transportation and other services to the offshore oil industry had about 70.6 million units outstanding as of June 30. Shares were off 4.9% to $27.34 premarket.

Vanguard Natural Resources LLC (VNR) is offering six million of its common units, representing limited-liability company interests, priced at $27.51 a share. The oil and gas exploration company had about 51.6 million common units as of Aug. 1. Units were down 4.5% to $27.38 premarket.

 
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PepsiCo Inc. (PEP) President John Compton is leaving the global food and beverage giant to become chief executive of privately held Pilot Flying J, which operates truck stops and convenience stores.

Red Lion Hotels Corp. (RLH) has suspended its review of strategic alternatives after the midscale hotels company didn't receive any buyout or merger offers.

Medical staffing company Team Health Holding Inc.'s (TMH) principal stockholder, Ensemble Health LLC, is offering eight million shares. The selling shareholder is an affiliate of the Blackstone Group L.P. (BX), which owns about 26.4 million shares--or a roughly 39% stake in the company, according to a regulatory filing. After the offering, Blackstone and its affiliates are expected to own between roughly 26% and 27% of the company shares.

Texas Instruments Inc. (TXN) narrowed its third-quarter revenue outlook around the midpoint of its guidance and lifted the lower end of its earnings outlook as an insurance payment and cost cuts masked softer demand.

Trina Solar Ltd. (TSL) unveiled plans to streamline its business, including plans to separate its photovoltaic module and systems units, as the Chinese solar-products maker looks to cut costs amid an increasingly competitive solar PV industry.

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

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