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Shake Shack will close nine company-owned restaurants by Sept. 25, the fast-casual restaurant said Tuesday, citing underperformance and possible cannibalization of other locations in the 527-unit system.

In a filing with the Securities & Exchange Commission, the New York City-based fast-casual chain said that over the course of its regular portfolio evaluation it identified restaurants in California, Ohio, and Texas that were underperforming “in part due to changes in the trade area and, in some cases, are negatively impacting other Shacks within their proximity by cannibalizing sales,” it said.