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Market Insider | What's Shaking | Earnings to Watch | Before the Bell

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

Tyson Foods – Tyson earned $0.36 per share, excluding certain items, nine cents a share below estimates, with revenue also falling short. The food producer said the second quarter is usually its most challenging and that this year was no exception, but it does expect strong results in the second half of the year.

Berkshire Hathaway - Berkshire earned $2,302 per share for the first quarter, above estimates of $1,995.50, while revenue beat estimates, as well. That report came ahead of Berkshire's high-profile annual meeting this past weekend.

Pfizer – The drug maker plans to begin selling its best-selling erectile dysfunction drug Viagra online, according to the Associated Press. A prescription will still be required, but the move is seen as a significant disruption to the industry's current distribution model.

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BMC Software - BMC is close to a deal to be bought by a private-equity group led by Bain Capital and Golden Gate Capital, according to Reuters. The deal is said to be worth about $46 per share, or a total of more than $6.5 billion.

JPMorgan Chase - Shareholders are being urged by proxy advisory firm ISS to reject three board members up for re-election. ISS told shareholders that directors David Cote, James Crown, and Ellen Flutter should not be returned to the board because of "material failures of stewardship and risk oversight."

Toyota Motor – The automaker's profits are expected to come in at $13.1 billion for the fiscal year that ended in March, according to the Nikkei business daily. That would be more than 3-1/2 times the prior year's profit.

Caterpillar – Caterpillar's shares appear "cheap", according to an article in this week's Barron's. The paper said the construction equipment maker will benefit from the ongoing economic recovery.

Macerich – The real estate investment trust's stock will replace Coventry Health Care in the S&P 500 after the close of trading Wednesday. Coventry is in the process of being acquired by Aetna and the deal is expected to be completed this week.

BlackBerry - Canaccord Genuity has repeated a "sell" recommendation on the stock, citing weakening sales of the new Z10. However, that negative sentiment is being countered by reports that BlackBerry is about to introduce a cheaper version of the Z10 called the R10.

Intel - RBC Capital upgraded Intel shares to "outperform" from "sector perform," based on improving prospects in the mobile sector.

Humana, UnitedHealth Group - JPMorgan Chase has upgraded Humana to "overweight" from "neutral," while reinstating coverage of UnitedHealth with an "overweight" rating.

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—By CNBC's Peter Schacknow

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