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Check out which companies are making headlines before the bell on Tuesday:

D.R. Horton–The home builder matched estimates with fourth quarter profit of 40 cents per share, with revenue slightly above forecasts. The company saw a 19 percent increase in sales and a 13 percent increase in its order backlog compared to a year earlier.

Dish Network–The satellite TV operator reported third quarter profit of 68 cents per share, excluding certain items, well above estimates of 43 cents. However, the subscriber increase of 35,000 well short of the 135,000 chalked up by rival DirecTV.

NRG Energy–The utility is buying Edison International unit Edison Mission Energy for $2.6 billion in cash and stock. Edison Mission – which runs coal plants and wind farms – had filed for bankruptcy protection last December. Separately, NRG reported a third quarter profit but lowered the upper end of its 2013 guidance.

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Transocean–An SEC filing indicates investor Carl Icahn holds a 5.96 percent stake in the oilfield services company as of November 10, compared to 5.61 percent on January 29.

Leapfrog–BMO upgraded the toy maker's stock to "outperform" from "market perform", saying the shares are oversold.

FedEx–Cowen downgraded FedEx shares to "market perform" from "outperform", saying the shares were fairly priced and lack significant near-term upside.

Costco–UBS downgraded the retailer's shares to "neutral" from "buy".

Twitter–Susquehanna initiated coverage on Twitter with a "neutral" rating, saying that although it's positive on the company's overall prospects, it's wary of current valuation levels.

SeaWorld Entertainment–Citi upgraded the theme park operator's shares to "buy" from "neutral", on lessening concern about the tax impact of potential conversion to a real estate investment trust.

Jos. A. Bank–The clothing seller is forecasting better than expected third quarter earnings, as sales rise. The company will release its full third quarter results on December 5.

Sotheby's —The auction house posted a third quarter loss of 44 cents per share, three cents narrower than expected, with revenue exceeding analyst forecasts. Sotheby's saw more private sale commissions, as well as auction commission revenue, during the quarter.

News Corp–News Corp. reported a fiscal first quarter profit of three cents per share, excluding certain items, missing estimates by two cents, with revenue also below consensus. This was the first earnings report from News Corp. as a standalone print media company, following its spin-off from the company now known as 21st Century Fox.

Rackspace Hosting– The cloud computing operator reported third quarter profit of 11 cents per share, five cents below estimates, though revenue was roughly in line with forecasts. Rackspace's bottom line was hit by higher expenses, as it increases marketing efforts to attractive more business.

T-Mobile US –T-Mobile announced a secondary offering of more than 66 million shares, with the mobile carrier saying it might use the proceeds to buy more wireless spectrum.

Hologic– The company earned 39 cents per share for its fourth quarter, two cents above estimates, with revenue slightly below consensus. The maker of women's health care products also recorded a 1.1 billion dollar charge for impaired goodwill, as well as forecasting current quarter revenue and profit below Street estimates.

Emulex – Emulex s buying back $200 million in shares, and the maker of networking equipment is also reducing the size of its board to 11 from 12 and adding three independent directors. Former CEO and current executive chairman Jim McCluney will leave the company by February and won't stand for reelection to the board.

Wal-Mart–The world's largest retailer will begin offering special holiday deals at 6 p.m. on Thanksgiving night, two hours earlier than last year. It will then stagger various deals through the night and into the next day.

Google– Google's Motorola unit will introduce a lower-cost phone this week, according to the Wall Street Journal, as sales of its Moto X model remain weak. The new model will reportedly be known as the Moto G.

—By CNBC's Peter Schacknow

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