Stocks: 5 things to know before the open

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It's all about tech today, and the Nasdaq looks set to take a big dip after hitting all-time highs on Monday.

Apple (AAPL) and Microsoft (MSFT) are weighing on the index after disappointing earnings late Tuesday.

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

1. Tech movers -- Apple, Microsoft, Yahoo: Apple is set for a big drop at the open after it sold fewer iPhones than expected in the last quarter, and offered a weak outlook for the current three-month period. The stock was down 5% in premarket trading.

Microsoft is down about 4% premarket after the firm reported a huge quarterly loss, mostly due to an $8.4 billion write-down of its Nokia acquisition last year.

Shares in Yahoo (YHOO) are also declining by about 2% ahead of the open after reporting earnings Tuesday.

This could pull the Nasdaq down by about 1% at the open.

U.S. stock futures show the Dow Jones industrial average and S&P 500 are also in negative territory, though the moves aren't as dramatic.

2. Other market movers -- Chipotle, AT&T, DirecTV: Shares in Chipotle (CMG) could tumble at the open after the restaurant chain said growth had slowed dramatically in the past year. The chain's shares slid roughly 5% in extended trading.

Meanwhile, shares in AT&T (T) and DirecTV (DTV) could move up a bit Wednesday after the chairman of the Federal Communications Commission said he is ready to give a thumbs up to their $49 billion merger.

Related: Fear & Greed Index

3. Earnings: Another barrage of earnings reports are expected today. Among the companies reporting before the open are Coca-Cola (KO) and Boeing (BA).

American Express (AXP) and Qualcomm (QCOM) are reporting after the close.

4. Economics: The National Association of Realtors will release monthly data on existing home sales at 10 a.m. ET. The association reported existing home sales in May were up 5.1%, with much of the gain due to demand from first-time home buyers.

At 10:30 a.m., the U.S. Energy Information Administration will release new data on crude oil inventories. Oil futures are trading around $50 per barrel, down 1.4%.

Related: CNNMoney's Tech30

5. International markets overview: European markets are mostly declining in early trading.

Asian markets ended with mixed results.

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