After-hours buzz: Twitter, Amgen, American Express & more

Check out which companies are making headlines after the bell Tuesday:

Traders work on the floor of the New York Stock Exchange.
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Traders work on the floor of the New York Stock Exchange.

Twitter - Shares surged after the firm reported second-quarter earnings that topped Wall Street expectations. The social media company posted earnings of 2 cents per share, excluding items, on revenue of $312 million, versus expectations of a loss of 1 cent per share on $283 million in revenue.

Amgen - The world's largest biotech firm posted higher-than-expected quarterly profit and announced that it would cut 12 to 15 percent of its workforce and close two plants. The stock rose after the announcement.

U.S. Steel - Shares rallied after the firm posted a narrower than expected loss, helped by improving steel prices.

American Express - The consumer credit card company posted second-quarter earnings of $1.43 per share on $8.66 billion in revenue, beating earnings expectations for $1.38 per share and in line with revenue estimates. But shares edged lower after the bell.

Panera Bread - The food chain operator handed in mixed second-quarter earnings. Shares rose in after-hours trade following the report.

Marriott - Shares wavered in extended-hours trading after the hotel operator announced second-quarter profit that topped analyst estimates, while revenue trailed Street estimates.

—By CNBC's Karma Allen.

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