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After-hours buzz: Amazon, Microsoft, Google & more

Check out the companies making headlines after the bell Wednesday:

A trader works on the floor of the New York Stock Exchange.
Adam Jeffery | CNBC
A trader works on the floor of the New York Stock Exchange.

Amazon.com's quarterly loss was in line with Street estimates, while revenue topped forecasts as North American sales increased 24 percent.

Google missed earnings and revenue estimates as aggregate cost-per-clicks fell 7 percent, year-over-year. However, shares rose 3 percent in after-hours trading.

Microsoft topped Wall Street's forecasts on the top and bottom lines, boosted by strong growth in its hardware and cloud sectors. The stock rose more than 3 percent after the announcement.

Starbucks shares rose after it reported profit that was in line with projections, while revenue came in better-than-expected. Global comparable-store sales also topped projections.

Altera missed expectations on the top and bottom lines, sending shares tumbling about 5 percent. The chip maker reported first-quarter earnings of 31 cents a share, missing estimates by a penny. Meanwhile, revenue came in at $435 million, compared to forecasts for $471 million.

Music streaming provider Pandora reported a narrower-than-expected first-quarter loss of 12 cents a share on $231 million, which also beat estimates. However, shares fell as key user metrics missed projections.