Stocks: 5 things to know before the open

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Get ready for an earnings explosion!

Dozens of big companies are reporting quarterly results Tuesday and Wall Street is gearing up for an eventful day.

Here are the five things you need to know before the opening bell rings in New York:

1. Earnings: There are so many companies reporting earnings it's hard to read the list without pausing for breath.

Here are some of the biggest names due this morning: BP (BP), Hershey (HSY), T-Mobile US (TMUS), Office Depot (ODP), Procter & Gamble (PG), Coach (COH), Fiat Chrysler (FCAM), Jetblue Airways (JBLU), Spirit Airlines (SAVE), 3M (MMM), Barrick Gold (ABX) and Thomson Reuters (TRI). (Phew!)

Then after the trading day ends, we'll hear from the likes of Apple (AAPL), Twitter (TWTR), Chipotle Mexican Grill (CMG), eBay (EBAY) and AT&T (T).

Investors will be watching Apple's earnings closely. The company is expected to say that its sales and profit both fell last quarter -- that would make them the worst set of results in 13 years.

Meanwhile, investors are keeping an eye on Twitter since shares in the firm have tanked by about 26% since the start of the year. Investors are worried about the company's ability to be a standalone, viable social network.

Related: CNNMoney's Tech30

2. Global stock market overview: It looks like Tuesday will be a positive day, provided earnings season doesn't kill the mood.

U.S. stock futures are holding steady as European markets move higher in early trading.

Asian markets ended the day with mixed results.

Related: Fear & Greed Index

3. Stock market movers -- Mitsubishi Motors, BP: Shares in Mitsubishi Motors have hit a fresh low after falling by about 50% since it admitted to cheating on fuel economy tests last week.

The company admitted on Tuesday that it has been using improper fuel testing methods since 1991. The shares fell 10% on Tuesday.

BP (BP) shares gained 3% in London despite an 80% slump in first quarter profit. The numbers weren't as bad as expected.

4. Economics: The latest Case-Shiller home price index, which tracks the health of the U.S. housing market, will be released at 9 a.m. ET.

The Conference Board will report U.S. consumer confidence figures for April at 10 a.m.

5. Monday market recap: It was a relatively uneventful, uninspiring day in the markets on Monday. The Dow Jones industrial average, S&P 500, and Nasdaq each shed 0.2%.

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