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Updated from 9:54 a.m. EDT

McDonald's

(MCD) - Get McDonald's Corporation (MCD) Report

posted a jump in sales for September and the third quarter after the closing bell on Tuesday.

The company said total systemwide sales increased 11.1% in September and 10.8% for the third quarter.

Earlier in the day, Smith Barney upgraded the company's shares, saying the restaurant chain has been successful in pushing its new premium salads and McGriddles.

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Smith Barney, which upgraded the stock to buy from hold, has done banking for McDonald's within the past 12 months.

Last week,

Wendy's

(WEN) - Get Wendy's Company Report

said same-store sales in its U.S. outlets rose 3.5% for September. The company confirmed earnings guidance for the year on the strength of the new chicken strips it introduced to compete with McDonald's.

Both companies will report third-quarter results the last week of October.

Shares of McDonald's rose 2.6%, or 62 cents, to $24.72 Tuesday.