Sandwich-maker Potbelly  (PBPB) - Get Report shares were up nearly 10% Wednesday morning after the company announced that CEO Aylwin Lewis will be departing the company on August 8 after nine years at the helm. Lewis will also step down from his position on the company's board. 

"We are grateful for Aylwin's leadership during his nine-year tenure at Potbelly. We appreciate his vast contributions. He is a world class restaurant leader and Potbelly benefited from his leadership," said the company's lead director Peter Bassi. 

The company said it has begun the search for Lewis' replacement. 

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