Among the companies whose shares expected to actively trade in Tuesday's session are Intuitive Surgical Inc. (ISRG), WD-40 Co. (WDFC) and Barnes & Noble Inc. (BKS)

Intuitive Surgical projected second-quarter results below analyst expectations, saying that sales of its robotic surgery machines were hurt by increased economic pressure on hospitals and slower growth of benign gynecologic procedures. Shares slumped 12% to $442 after hours.

WD-40's fiscal third-quarter profit rose 12% as the company reported strong sales of its multi-purpose products, including its flagship lubricant spray, in Europe and the Americas. Shares jumped 14% to $65.86 as the company also raised its full-year outlook.

Barnes & Noble Chief Executive William Lynch has resigned and the bookseller unveiled a handful of executive changes, moves that come as the company has posted sharp drops in same-store sales and significant challenges in its Nook e-reader division. Shares were down 4.8% to $16.81 after hours.

AmeriGas Partners LP (APU) lowered the top end of its projection for full-year adjusted earnings before interest, taxes, depreciation and amortization, and said one of its unitholders has launched an offering of 6 million common units. Units fell 4.8% to $47.38 after hours. The company has about 92.8 million units outstanding.

Biopharmaceutical firm Amarin Corp. PLC (AMRN) is offering to sell 21.7 million American depositary shares. The company recently had around 135.5 million ADSs outstanding, according to FactSet. Amarin's ADSs were down 11% to $5.52 after hours.

Home Properties Inc. (HME) plans to offer 3.5 million shares, as it looks to fund acquisitions, new development and redevelopment of apartments. The real estate investment trust had around 52.2 million shares outstanding as of April 25. Shares fell 2.2% in after-hours trading to $64.10.

 
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Alcoa Inc. (AA) reported a steep $119 million net loss, taking huge charges to close capacity in face of tepid demand, a global glut of aluminum, record-high inventories and lower prices.

Applied Materials Inc. (AMAT) is seeing a four-year growth path that should at least double its earnings. The big maker of tools for manufacturing computer chips and displays on Monday projected adjusted earnings per share of anywhere from $1.50 to $2.15 by its 2016 fiscal year. Applied reported earnings of 75 cents in the fiscal year ended Oct. 28 on that basis, which excludes restructuring and acquisition-related charges and other one-time items.

Specialty chemicals firm Cytec Industries Inc. (CYT) said it is changing the way it accounts for pension and other retirement benefits, and anticipates related charges to be lower than expected in 2013.

Ignite Restaurant Group Inc. (IRG) filed plans for certain shareholders, including investment fund J.H. Whitney, which holds a 68% stake in the casual eatery operator, to offer an undisclosed number of shares.

Ixia (XXIA) cut its second-quarter revenue guidance amid lower than expected revenue from network equipment manufacturers and certain service providers.

NGL Energy Partners LP (NGL) launched an offering of 9 million units, planning to use the proceeds to pay down debt. The energy company recently had around 49.1 million units outstanding.

Quanex Building Products Corp. (NX) has named board member William C. Griffiths as its new chairman, president and chief executive, succeeding David D. Petratis who has resigned to accept a position with another company.

ScanSource Inc. (SCSC) lowered its fiscal fourth-quarter revenue view, with sales of the maker of bar-code scanners and label printers expected to decline from a year earlier but improve from the previous quarter.

SORL Auto Parts Inc. (SORL) said EFP Rotenberg LLP has resigned as its independent accounting firm because it is withdrawing from auditing Chinese companies.

Tibco Software Inc. (TIBX) has promoted Matt Langdon to the role of chief financial officer.

United Continental Holdings Inc.'s (UAL) consolidated traffic shrank 0.6% in June as the carrier's capacity declined.

The Washington Post Co. (WPO) said it will make a financial investment in church-finding website FaithStreet.com and contribute the contents of its online OnFaith section.

Wynn Resorts Ltd. (WYNN) said the Securities and Exchange Commission doesn't plan to recommend any enforcement action against the casino operator following an informal investigation.

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

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