NEW YORK (TheStreet) -- Shares of GrubHub Inc. (GRUB) - Get Reportare slipping, down -4.28% to $40.93 after the online food ordering company publicly filed to sell 10 million of its shares in a secondary offering today.

The Chicago-based company will offer 1.25 million shares, while shareholders will offer 8.78 million, and will have 80 million shares outstanding after the offering is completed. 

GrubHub merged with New York-based Seamless last year and raised a greater than expected $193 million in its initial public offering in April.

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GRUB data by YCharts

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