Italian confectioner Ferrero, known for brands like Nutella and Kinder, is buying the century-old U.S. cereal company WK Kellogg in an effort to expand its North American sales.

Shares of cereal maker WK Kellogg ( KLG 30.63%) rose 34% this week as of noon E.T. Thursday, according to data provided by S&P Global Market Intelligence. One week after being added to a slew of Russell Value indexes, it turns out WK Kellogg was indeed a good value investment -- at least in the eyes of Ferrero.

Shares of WK Kellogg ( KLG) surged 30% Thursday as the maker of Froot Loops and Frosted Flakes announced it had reached a deal to be acquired by Italian sweets company The Ferrero Group for $23 per share in cash, or about $3.1 billion.

WK Kellogg Co. jumped nearly 30% on July 10 following the announcement from Italian food leader Ferrero regarding a $3.1 billion acquisition, inclusive of debt.

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WK Kellogg Co’s headquarters is in Battle Creek. After the transaction closes, Battle Creek will remain a core location for the company and will be Ferrero’s headquarters for North America cereal, a news release from WK Kellogg states.

Ferrero has signed a deal to take WK Kellogg private in an agreement worth $3.1 billion, The Associated Press reported.