What follows is a roundup of corporate earnings reports for Tuesday, May 3.

Pfizer and MasterCard are expected to report earnings before the bell.

Comcast and CBS are expected to release earnings after the bell.

BEFORE THE BELL

Pfizer

The pharmaceutical company reported earnings of 60 cents a share on revenue of $16.5 billion.

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American Tower

The wireless tower company released earnings of 23 cents a share on revenue of $562.7 million.

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Archer-Daniels Midland

The food processor and ethanol producer announced earnings of 86 cents a share on revenue of $20.1 billion.

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Avon Products

The cosmetics company posted earnings of 37 cents a share on revenue of $2.63 billion.

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Clorox

The household products maker delivered earnings of $1.02 a share on revenue of $1.3 billion.

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Cognizant Tech

The tech firm released earnings of 67 cents a share on revenue of $1.37 billion.

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Duke Energy

Theutilityreleased earnings of 39 cents a share on revenue of $3.66 billion.

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Emerson Electric

The electronics manufacturer posted earnings of 73 cents a share on revenue of $5.86 billion.

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Foster Wheeler

The construction company announced earnings of 19 cents a share on revenue of $1.04 billion.

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Health Care REIT

The real estate investment trust released earnings of 24 cents a share on revenue of $255.5 million.

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Hyatt

The hotel operator reported earnings of 7 cents a share on revenue of $875 million.

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Legg Mason

The investment services company posted earnings of 45 cents a share.

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Marathon Oil

The oil company announced earnings of $1.65 a share.

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MasterCard

The credit card company reported earnings of $4.29 a share on revenue of $1.5 billion.

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MetroPCS

The telecommunications company delivered earnings of 15 cents a share on revenue of $1.19 billion.

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Molson Coors

The brewer released earnings of 43 cents a share on revenue of $690.4 million.

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Mylan Labs

The pharmaceutical company posted earnings of 44 cents a share on revenue of $1.45 billion.

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Tenet Healthcare

The healthcare company reported earnings of 16 cents a share on revenue of $2.5 billion.

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AFTER THE BELL

Comcast

The cable company , also the majority holder of CNBC, reported earnings of 36 cents a share on revenue of $12.13 billion.

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CBS

The media company released earnings of 29 cents a share on revenue of $3.51 billion.

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Genworth Financial

The insurance company posted earnings of 20 cents a share on revenue of $2.57 billion.

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Green Mountain Coffee

The coffee company delivered earnings of 48 cents a share on revenue of $648 million.

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Kinross Gold

The gold miner announced earnings of 16 cents a share on revenue of $937 million.

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McKesson

The health care services firm reported earnings of $1.66 a share on revenue of $28.85 a share.

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Yamana Gold

The gold mining company posted earnings of 21 cents a share on revenue of $476.1 million.

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* Earnings data from Thomson Reuters excludes extraordinary items.