U.S. HOT STOCK FUTURES: HOT STOCKS TO WATCH

Among the companies with shares expected to actively trade in Tuesday's session are Herbalife Ltd. (HLF), Array BioPharma Inc. (ARRY) and Gigamon Inc. (GIMO).

Herbalife's second-quarter profit rose 8.5% as the nutritional-supplements maker recorded double-digit sales growth. Shares jumped 5.8% to $64.09 after hours as results topped Herbalife's expectations and the company lifted its full-year guidance.

Drug developer Array BioPharma 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 8.5% to $6.79 after hours.

Gigamon's 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 higher in after-hours trading. Shares rose 8.3% to $34.25 after hours.

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 in after-hours trading as net income surpassed expectations.

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. Shares were up 4% to $78.05 after hours as earnings beat expectations and the company raised its earnings guidance for the year.

Maker of test-and-measurement equipment National Instruments Corp.'s (NATI) second-quarter profit fell 45% as higher input costs pressured its margins. Shares fell 9.9% after hours to $27.50 as the company also gave a downbeat third-quarter view.

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. Shares dropped 11% to $24.40 after hours.

PMC-Sierra Inc.'s (PMCS) second-quarter loss widened as the chip maker's revenue continued to decline. Shares fell 7.4% to $6.49 after hours.

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 4.5% to $33.80 after hours.

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 9% to $5.14 in after-hours trading Monday.

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. Shares rose 2.9% to $82 after hours, however, as 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.

 
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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.

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.

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.

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% the timber real-estate investment trust reported increased operating income across its businesses, as demand and pricing also improved.

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.

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 Nathalie Tadena at [e-mail]

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