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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 Tuesday:

Alcoa - The Dow Jones Industrial Average component reported fiscal first-quarter profit of $0.11 per share, excluding certain items, three cents above estimates, with revenue slightly below consensus. Alcoa's top line has been impacted by low aluminum prices, and those low prices are expected to impact its performance in coming quarters.

J.C. Penney - CEO Ron Johnson was ousted by the board, with former CEO Myron Ullman returning to that post. Johnson departs after just 17 months and only partially into a massive overhaul of Penney stores.

Monster Beverage - The beverage maker has announced a $200 million stock buyback program. It replaces an expired $250 million dollar program.

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United Continental - The airline reports a 1.2 percent decline in March traffic compared to a year earlier, due to a cutback in capacity. The number of passengers carried and the percentage of seats filled both increased, while capacity was cut by 4.6 percent.

Google - Google is the target of an anti-trust complaint in Europe, led by Microsoft, Nokia, and Oracle. The group said Google is acting unfairly by giving away its Android mobile operating system, but requiring users to install Google software, such as YouTube.

Ford Motor - The automaker's Focus model was the top-selling passenger car in the world last year. The automaker sold about 1.02 million Focus models last year, according to data from consulting firm Polk. More than 25 percent of those were sold in China.

Walt Disney - Disney will lay off about 150 people at its film studio, and will come before the end of this week.

St. Jude Medical - RBC Capital Markets has downgraded the medical products maker to "underperform" from "sector perform." RBC's survey of medical practitioners indicates a greater-than-expected loss of market share in the implantable cardio defibrillator market over the next few years.

A. Schulman - The maker of plastic compounds has lowered its full-year earnings forecast, citing expectations that Europe is going through another rough economic period.

Corrections Corporation of America - The prison operator has authorized a $675 million special dividend, amount to $6.63 per share, as part of its conversion to a real estate investment trust.

(Read More: See CNBC's Market Insider Blog)

—By CNBC's Peter Schacknow

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