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

Among the companies with shares expected to actively trade in Tuesday's session are Yahoo Inc. (YHOO), Digital Generation Inc. (DGIT) and Mattress Firm Holding Corp. (MFRM).

Yahoo Inc. on Monday named Marissa Mayer, a longtime Google Inc. (GOOG) executive, to be its next chief executive officer, as the onetime Internet pioneer tries to reverse its downward course. Shares rose 2.1% to $15.98 after hours.

Digital Generation said it is conducting a strategic review that may include a potential sale of the company, partnerships, business model changes or other deals. Shares jumped 22% to $11.70 after hours.

Mattress Firm Holding lowered its full-year revenue and same-store sales guidance, but boosted its earnings estimates, as the retailer continues to integrate its recent acquisition, Mattress Giant. Shares slid 13% after hours to $26.

J.B. Hunt Transport Services Inc.'s (JBHT) second-quarter earnings increased 22% as the trucking company's intermodal revenue strengthened, though overall revenue grew less than expected. Shares were off 3.7% to $56.20 after hours

StanCorp Financial Group Inc. (SFG) posted downbeat preliminary earnings for its second quarter, as the insurer said it was hurt by higher-than-anticipated payouts in its group long-term disability insurance business. Shares dropped 4.5% to $35.42 after hours.

Cheniere Energy Inc. (LNG)has agreed to sell 20 million shares to repay debt and for general corporate purposes. The liquefied-natural gas company's shares were off 4.2% to $14.07 after hours.

 
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Barnes Group Inc. (B) agreed to acquire privately held Synventive Molding Solutions for $335 million, a move the company expects to present opportunities for growth in injection molding applications.

Brown & Brown Inc.'s (BRO) second-quarter earnings jumped 15% as the insurance agency and brokerage firm posted strong growth in its revenue from retail commission and fees.

Cintas Corp.'s (CTAS) fiscal fourth-quarter earnings rose 11% on a continued rise in revenue from the company's uniform-rental business and improved margins.

DTS Inc. (DTSI) said its second-quarter revenue will likely fall short of expectations, reflecting macroeconomic factors, even as its profit comes under pressure from acquisition costs.

Flir Systems Inc. (FLIR) forecast second-quarter results below analyst expectations due to weakness in Europe and delayed deliveries, as the sensor systems manufacturer also cut its full-year guidance.

ICU Medical Inc.'s (ICUI) second-quarter earnings fell 3.6% as revenue eased and the medical products company was hit with higher costs. However, the company raised the lower end of its 2012 per-share earnings estimate.

Hartford Financial Services Group Inc. (HIG) expects catastrophe charges of $280 million to $300 million, before taxes, in the second quarter, reflecting widespread losses from the June 28 storms that swept across the Ohio River Valley and the mid-Atlantic states.

Kennedy-Wilson Holdings Inc. (KW) said it plans to offer 7.5 million shares to pay down debt. It will also use proceeds for working capital and general corporate purposes.

Lincare Holdings Inc.'s (LNCR) second-quarter earnings were up 12% as the oxygen-equipment provider reported stronger revenue, masking higher expenses and fewer contributions from Medicare.

Packaging Corp. of America's (PKG) second-quarter income rose a better-than-expected 15% as the corrugated box maker said it benefited from higher containerboard and corrugated products volume, as well as lower costs for energy.

-Write to Nathalie Tadena at [e-mail]