U.S. private equity firm Bain Capital plans to buy Japanese advertising agency Asatsu-DK Inc (9747.T) in a deal that could be worth $1.2 billion or more, a person familiar with the transaction said on Monday.

Bain will launch a tender offer soon for as many shares of Asatsu-DK as possible, the person said, asking not to be identified because he is not in a position to speak to media.

The Nikkei business daily, which reported the buyout earlier on Monday, said Bain would pay about 150 billion yen ($1.33 billion) for the Japanese company.

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