Among the companies with shares expected to actively trade in Tuesday's session are Herbalife Ltd. (HLF), Health Management Associates Inc. (HMA) and fertilizer companies.

Herbalife's second-quarter profit rose 8.5% as the nutritional-supplements maker recorded double-digit sales growth. Shares jumped 7.1% to $64.85 premarket as results topped Herbalife's expectations and the company lifted its full-year guidance.

Health Management Associates agreed to be acquired by Community Health Systems Inc. (CYH) for about $3.9 billion in cash and stock--at a per-share price below its current market value--after a months-long battle with its largest shareholder and a review of its strategic options. HMA shares fell 7% to $13.88 premarket, while Community Health shares rose 2.4% to $6.71.

Fertilizer companies, mainly those in the potash business, were hit hard premarket after Russian fertilizer company Uralkali suggested potash prices could fall to $300 a ton by year-end. Potash Corp. (POT) just last week cut its outlook for the rest of the year after weaker second-quarter results, and said it was hurt by competition and falling potash prices. Potash shares fell 27% to $27.82 premarket, while The Mosaic Co. (MOS) fell 30% to $37.00, Intrepid Potash Inc. (IPI) fell 25% to $14.55, Agrium Inc. (AGU) dropped 10% to $82.00 and Monsanto Co. (MON) slid 2.9% to $98.66.

Drug developer Array BioPharma Inc. (ARRY) said it will receive up to $387 million in upfront and potential milestone payments under a new collaboration with Celgene Corp. (CELG) for an Array-invented preclinical development program targeting an inflammation pathway. Array shares jumped 7.8% to $6.75 premarket.

Coach Inc. (COH) agreed to sell its Reed Krakoff business to a group led by Reed Krakoff and reported its fiscal fourth-quarter earnings fell 12% amid weaker North American same-store sales. Shares slipped 6.2% to $54.27 premarket as revenue came in just below analysts' estimates.

Gigamon Inc.'s (GIMO) better-than-expected second-quarter results, the first quarterly report the networking-hardware company issued since going public last month, led investors to send shares 6.7% higher to $33.75 premarket.

Telecom-gear maker Alcatel-Lucent (ALU, ALU.FR) plans to seek several strategic partners to take small stakes in itself, the company's chief executive said Tuesday, as the company's second-quarter net loss widened on a big impairment charge on its wireless business. The first company to take a small stake in Alcatel-Lucent is chipmaker Qualcomm Inc. (QCOM), which is buying the stake as part of a research-and-development pact to make new wireless transmitters for homes and offices. Alcatel-Lucent's American depositary shares rose 8.6% to $2.39 premarket.

Generator maker Generac Holdings Inc. (GNRC) easily trumped analysts' estimates with its second-quarter growth, prompting the company to boost the year's revenue target a second time. Shares rose 7.3% to $44.01 premarket.

Stereotaxis Inc. (STXS) said it has been granted clearance by the U.S. Food and Drug Administration to market in the U.S. its Vdrive Robotic Navigation System with V-Sono Intracardiac Echocardiography catheter manipulator. Its the first FDA clearance for the Vdrive family of products, which have been utilized in Europe since 2011. Shares jumped 46% to $2.59 premarket.

American Capital Agency Corp. (AGNC) swung to a profit in the second quarter as the company posted a gain on securities. Shares rose 5.3% to $23.00 in premarket trading as net income surpassed expectations.

Vanda Pharmaceuticals Inc. (VNDA) said the U.S. Food and Drug Administration granted priority review of the company's new drug application for tasimelteon for the treatment of Non-24-hour Disorder in the totally blind. Shares rose 27% to $10.22 premarket.

William A. Franke will resign as chairman of Spirit Airlines Inc.'s (SAVE) board in August as funds affiliated with private-equity fund Indigo Capital LLC divest their stake of 12 million shares in the discount air carrier. Spirit had 72.6 million shares outstanding as of July 19. Shares were down 5.9% to $33.30 premarket.

Drug developer Sunesis Pharmaceuticals Inc. (SNSS) said that an ethics committee has recommended that a study assessing the sole use of the company's vosaroxin treatment for acute mylogenous leukemia be discontinued. Shares fell 11% to $5.05 in premarket trading.

 
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Anadarko Petroleum Corp. (APC) swung to a second-quarter profit as the oil and gas producer was helped by derivatives gains and other impacts.

Standard & Poor's Ratings Service on Monday downgraded enterprise software company BMC Software Inc.'s (BMC) rating to junk territory, citing a "substantial" amount of debt financing related to its acquisition by a group led by Bain Capital and Golden Gate Capital.

Caesars Entertainment Corp.'s (CZR) second-quarter loss narrowed as the casino operator recorded a benefit from extinguishing debt, though revenue was roughly flat.

Community Health Systems Inc.'s (CYH) second-quarter earnings fell 64% as the rural hospital operator was hurt by lower admissions, higher-than-expected bad debt and an increasing portion of its patients with less lucrative health coverage.

Eastman Chemical Co.'s (EMN) second-quarter earnings rose 48% as the chemical and materials manufacturer reported increased sales in most of its segments, thanks in large part to its acquisition of Solutia Inc. Earnings beat expectations and the company raised its earnings guidance for the year.

Express Scripts Holding Co. (ESRX) second-quarter earnings soared on lower costs as the pharmacy-benefits manager also announced that its Chief Financial Officer Jeff Hall will step down.

General Growth Properties Inc. (GGP) swung to a second-quarter profit on a gain tied to investment properties and as charges weighed on the bottom line last year, while funds from operations grew ahead of the company's expectations.

Hartford Financial Services Group Inc.'s (HIG) second-quarter loss widened as the insurer was hit by a $421 million loss related to its international variable annuity hedging programs and other items.

HCA Holdings Inc. (HCA) has named R. Milton Johnson as its next chief executive, succeeding Richard Bracken who will retire from the CEO role at the end of the year.

Standard & Poor's Ratings Services has raised its outlook on Kraft Foods Group Inc.'s (KRFT) ratings to stable, a rosier view pegged to an expectation the food company will improve its leverage.

Manitowoc Co.'s (MTW) second-quarter profit jumped 27% as the equipment manufacturer reported higher sales for the company's cranes and food service equipment businesses.

Building-products manufacturer Masco Corp. (MAS) swung to a second-quarter profit as revenue strengthened amid an increase in new home construction in North America and as a litigation settlement charge weighed on year-earlier results. Results topped analyst expectations.

Maker of test-and-measurement equipment National Instruments Corp.'s (NATI) second-quarter profit fell 45% as higher input costs pressured its margins. The company also gave a downbeat third-quarter view.

Northeast Utilities' (NU) second-quarter profit more than tripled as the company's prior-year results were stung by acquisition charges, while higher retail electric sales and lower expenses also bolstered the bottom line.

Office supply companies Office Depot Inc. (ODP) and OfficeMax Inc. (OMX) provided an update on their planned merger, including naming a new co-leader of the integration process and reaffirming expectations of recognizing up to $600 million in savings by joining forces.

Orthofix International N.V. (OFIX) is postponing its second-quarter earnings report because the medical device company needs additional time to review matters related to revenue recognition for prior periods.

PartnerRe Ltd. (PRE) swung to a loss in the second quarter as the reinsurer posted catastrophe losses and restructuring charges.

Plum Creek Timber Co.'s (PCL) second-quarter earnings rose 28% as the real-estate investment trust reported increased operating income across its businesses, as demand and pricing also improved.

PMC-Sierra Inc.'s (PMCS) second-quarter loss widened as the chip maker's revenue continued to decline.

R.R. Donnelley & Sons Co.'s (RRD) second-quarter profit fell 26% as the printing company recorded sharply higher income tax expenses, masking higher revenue.

U.S. Steel Corp. (X) swung to a second-quarter loss as the company recorded weaker bottom-line results in its flat-rolled, European and tubular segments.

Vertex Pharmaceuticals Inc.'s (VRTX) second-quarter loss narrowed as expenses declined, though sales of the company's hepatitis C drug Incivek continued to weaken. The pharmaceutical company's cystic fibrosis drug Kalydeco had a big second-quarter beat. Plus, the company disclosed a successful late stage trial that could expand Kalydeco's use to more patients.

XL Group PLC's (XL) second-quarter profit rose 23% as the property-and-casualty insurer recorded higher gains on investments, offsetting greater catastrophe losses.

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

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