After-hours buzz: Sonic, Palo Alto Networks & More

Check out which companies are making headlines after Monday's close:

Sonic - The drive-in restaurant chain posted first-quarter earnings of 13 cents a share on revenues of $126.7 million. Analysts had estimated earnings per share of 13 cents on revenue of $128 million. Shares rallied 4.6 percent in after-hours trading.

Palo Alto Networks - The network-security platform provider rallied in extended-hours trade after it said it acquired Morta Security, a cybersecurity company. Financial terms were not disclosed.

A. Schulman - Shares gained after the provider of plastic compounds and resins raised its fiscal 2014 earnings per share outlook to above consensus estimates.

Convergys - Shares jumped nearly 20 percent after it said it would buy Stream Global Services for $820 million in cash.

—By CNBC's Kate Gibson.

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