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

Applied Materials - The semiconductor equipment manufacturer will combine with Tokyo Electron in an all-stock transaction. Applied Materials shareholders will own 68 percent of the new company, with Tokyo Electron stockholders holding the remainder.

Facebook - The stock was upgraded to "buy" from "neutral" at Citi, which cites the sustainability of recent increases in growth even amid initial uncertainty about an increasing shift to mobile use. Separately, Facebook has rolled out its new "Autofill" mobile payments product, according to All Things D.

Apple - Susquehanna upgraded Apple to "positive" from "neutral", based on the success of the iPhone 5S and 5C launches. Susquehanna also said fears about margin erosion with the newer models were largely unrealized.

Lennar - The homebuilder earned 54 cents per share for its third quarter, nine cents above estimates, with orders rising 14 percent. Lennar also called its long term outlook "extremely bright."

National Oilwell Varco - National Oilwell will spin off its distribution business, creating two separate publicly traded companies.

Diamond Offshore - CEO Lawrence Dickerson is retiring after more than 30 years at the company. He'll remain on the job until a successor is chosen.

Safeway - The supermarket operator's shares were upgraded to "equal-weight" from "underweight" at Barclays, which said Safeway may be able to offset the $1.8 billion in capital gains tax generated from the sale of Safeway Canada.

Red Hat -The Linux software distributor reported second quarter profits of 35 cents per share, two cents above estimates, with revenues also above consensus. However, Red Hat's billings only grew by eight percent compared to expectations of 14 percent.

Citigroup- The megabank will lay off about 1,000 workers in its mortgage units because of a drop in demand.

Boeing - The aerospace giant's proposal to supply 60 new fighter jets to South Korea has been turned down, despite the fact that it was the only bidder. South Korea decided not to name a winning bidder, saying it needs more air power than originally planned because of North Korea's nuclear program.

VeriFone - VeriFone named Citigroup executive Paul Galant as its new CEO. He'll assume that post at the electronic payment systems provider on October 1.

Morgan Stanley, JPMorgan Chase, Credit Suisse, Goldman Sachs, and Wells Fargo - The cohort of banks are among nine sued by U.S. regulators over the sale of $2.4 billion in mortgage-backed securities. Those sales were made to two credit unions that later failed, with regulators alleging that the banks misrepresented those securities.

Archer Daniels Midland - ADM is planning to move its headquarters out of its longtime Decatur, Illinois home, although it said it will keep a workforce of 4,400 in Decatur.

Greenway Medical Technologies - Greenway will be taken private by Vista Equity Partners for $20.35 per share in cash, or about $644 million. The price is a 19 percent premium over Greenway's Monday closing price.

Oasis Petroleum - Goldman Sachs has added the stock to its "Conviction Buy" list, saying its known resources are well above those of peers.

—By CNBC's Peter Schacknow

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