Great Western Bancorp in Sioux Falls, S.D., has filed documents for an initial public offering.

The $9.3 billion-asset company said in a regulatory filing Thursday that it expects to sell shares held by National Americas Holdings, a unit of National Australia Bank.

The filing did not disclose the number of shares to be offered or the price range for the proposed offering, though it noted that the Australian bank will continue to own a majority of its common stock after the IPO.

Deutsche Bank Securities and BofA Merrill Lynch are acting as joint book-running managers and underwriters.

Great Western has 162 branches in South Dakota, Iowa, Nebraska, Colorado, Arizona, Kansas and Missouri. National Australia bought the company in 2008 and has since made a number of smaller acquisitions.

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