Among the companies with shares expected to actively trade in Tuesday's session are Cummins Inc. (CMI), Actavis PLC (ACT) and Huntsman Corp. (HUN).

Cummins' third-quarter earnings edged up 0.9% as the supplier of engines for heavy-duty trucks reported weaker revenue growth than expected and the cut its full-year sales outlook. Shares slipped 5.5% to $127.55 premarket.

Actavis' third-quarter earnings fell 14%, despite double-digit revenue growth, as the generic drug maker was hit by higher acquisition-related charges and other items. The company raised its per-share earnings estimate for the year. Shares climbed 4.4% to $152.25 premarket.

Huntsman Corp.'s (HUN) third-quarter earnings fell 45% as the chemical manufacturer logged an increase in operating expenses and weaker margins, though revenue improved slightly more than expected. Shares edged up 2.5% to $22.25 premarket.

After giving a downbeat revenue forecast three months ago, Xylem Inc.'s (XYL) results weren't nearly as bad as feared. But the water firm during the summer saw a "strong performance in emerging markets and better-than-expected activity in Europe." The cherry on top is Xylem undoing some of July's cut to 2013 estimates. Shares surged 11% to $32.20 premarket.

Archer Daniels Midland Co.'s (ADM) third-quarter revenue declined, while its earnings more than doubled as an accounting credit boosted the U.S. grain trader and processor's results. The bottom line just missed expectations, sending shares down 2.1% to $39 premarket.

LyondellBasell Industries N.V.'s (LYB) third-quarter earnings edged up 0.8% as the plastics and chemicals company reported stronger profits in its olefins and polyolefins segments, though results were weaker in its intermediates and refining businesses. Results missed estimates, sending shares down 2% premarket to $74.

Vertex Pharmaceuticals Inc. (VRTX) plans to reduce its global work force by 15% amid declines in the number of patients being treated with its Incivek drug, as the company also reported that its third-quarter loss widened and it cut its revenue view for the year. Shares dropped 2.4% to $76 premarket.

Nutrisystem Inc.'s (NTRI) better-than-expected adjusted third-quarter profit sent shares higher, as the weight-loss products company also struck a cautiously optimistic tone about the upcoming diet season. Shares climbed 9.2% to $16.40 in premarket trading, as results for the period exceeded the muted expectations Nutrisystem outlined in July.

Seagate Technology Inc.'s (STX) fiscal first-quarter earnings fell 27%, pressured by sliding revenue at the data-storage company. Shares fell 3.7% to $48 in premarket trading as results missed expectations.

Tableau Software Inc.'s (DATA) third-quarter profit increased more than sixfold driven by another surge in revenue. Revenue jumped 90% to $61.1 million in the quarter as the company reported growth in customer accounts. Shares of Tableau rose 10% to $69.50 premarket as the results beat expectations.

Michael Kors Holdings Ltd. (KORS) will replace NYSE Euronext Inc. (NYX) in the S&P 500 after trading closes Friday as IntercontinentalExchange Inc.'s (ICE) deal to acquire NYSE is expected to close soon. Shares rose 3.3% to $78.90.

 
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Aetna Inc.'s (AET) third-quarter earnings increased 4% as the health insurer's revenue and membership rolls were boosted by its acquisition of Coventry Health Care Inc., though the company also posted lower underwriting margins. Adjusted earnings declined more than expected.

Air Products & Chemicals Inc.'s (APD) fiscal fourth-quarter earnings fell 1.2%, as the industrial-gas provider's posted weaker revenue and was weighed down by discontinued operations. The company gave a weak outlook for the new year and first quarter.

Apple Inc. (AAPL) sold 33.8 million iPhones in the September quarter, up 26% from a year earlier, but not enough to prevent a third consecutive quarterly decline in earnings.

AZZ Inc.'s (AZZ) President and Chief Executive David Dingus died Sunday from medical complications related to pancreatic cancer, the electrical-products and galvanizing-services company disclosed. Those duties will be assumed by Chief Financial Officer Dana Perry on an interim basis.

CVSL Inc. (CVSL) has offered to pay $16.75 a share to acquire candle maker Blyth Inc. (BTH), according to Bloomberg, which cited two people with knowledge of the matter. The offer is valued at about $268 million.

Covidien PLC (COV) has stuck a deal to sell the company's confluent surgical product line to Integra LifeSciences Holdings Corp. (IART) for $235 million, unloading a line of soft-tissue repair tools.

DineEquity Inc.'s (DIN) third-quarter income sank 69% after the owner of the IHOP and Applebee's restaurant chains completed its plans to sell off company-owned locations, while IHOP continued to show strength, again posting an improvement in same-restaurant sales. Results beat expectations.

General Growth Properties Inc. (GGP) swung to a third-quarter profit amid fewer expenses. The company again raised its estimate for full-year funds from operations--a key profitability measure for real-estate investment trusts.

Hartford Financial Services Group Inc.'s (HIG) third-quarter earnings soared as the insurer reported better-than-expected revenue growth and the year-earlier period included a big loss related to the sale of its individual life business.

HCP Inc.'s (HCP) third-quarter earnings increased 19% as the senior-focused real-estate investment trust's rental revenue continued to increase. Results beat views and the company also slightly raised its full-year outlook for funds from operations.

HealthSouth Corp.'s (HLS) third-quarter profit rose 24% while the hospital operator experienced growth in revenue same-hospital discharges.

Herbalife Ltd.'s (HLF) third-quarter profit rose 27% as the nutritional-supplements maker posted a jump in world-wide sales.

JetBlue Airways Corp. reported its (JBLU) third-quarter earnings rose 58% and the U.S. discount carrier also unveiled changes in plans to improve its fleet to more closely align with demand and reduce costs. The plan includes deferring some aircraft and converting others.

Pfizer Inc.'s (PFE) third-quarter earnings fell 19% as the pharmaceutical company's sales weakened across most of its businesses, particularly its primary care segment. The company raised its the lower end of its per-share earnings estimate for the year but cut the upper end of its previous revenue view.

Plum Creek Timber Co. (PCL) has agreed to acquire industrial timber lands, related wind and mineral assets and an interest in other properties from MeadWestvaco Corp. (MWV) in a $1.1 billion deal as the real-estate investment trust also reported that its third-quarter earnings rose 22%.

Riverbed Technology Inc.'s (RVBD) third-quarter profit slumped 85%, as the network-equipment maker reported sharply higher sales and marketing expenses, offsetting an increase in sales across all markets it serves.

U.S. Steel Corp. (X) swung to a steep third-quarter loss as the steelmaker recorded a $1.8 billion write-down for its North American flat-rolled and Texas operations. Excluding that charge, U.S. Steel's adjusted loss for the period wasn't as severe as analysts expected, though shipments again declined from year-ago levels.

Valero Energy Corp.'s (VLO) third-quarter profit shrank 54% as total expenses climbed 6.5%, masking a rise in revenue. Results were better than feared.

Waste Management Inc.'s (WM) third-quarter earnings jumped 36% as the waste-disposal company posted increased internal revenue growth from yield and stronger margins, though it continued to face headwinds in its recycling business. Results beat expectations.

Write to Lauren Pollock at lauren.pollock@wsj.com

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