NEW YORK (TheStreet) -- Shares of Atento S.A.  (ATTO) - Get Report plunged 12.33% to $13.15 in afternoon trading Thursday, the customer relationship management company's first trading day after its IPO.

The company priced its initial public offering of 10 million shares at $15 a share for gross proceeds of approximately $72.3 million for Atento and $77 million for selling shareholder Atalaya Luxco Pikco S.C.A., an entity affiliated with Bain Capital.

The offering, which the company expects to close on October 7, contains a 30-day option for underwriters to purchase up to an additional 1.5 million shares.

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The stock opened at $13.75 and reached a high of $14 as of 1:20 p.m., by which point more than 5.6 million shares had changed hands.

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