HONG KONG—The operator of the Universal Studios Japan theme park in Osaka plans to list on the Tokyo Stock Exchange as early as September, a person with knowledge of the deal said.

USJ Co. has a current valuation of around $5 billion, the person said. The company's valuation has soared since the theme-park operator opened a new attraction last year dedicated to Harry Potter, the world-wide children's book phenomenon about a boy wizard. The Wizarding World of Harry Potter has drawn millions of visitors.

The possible size of the deal is unclear and depends on market conditions when the IPO launches, the person said. Its listing will come as two other big IPOs loom: Japan's government is planning a multibillion-dollar float of Japan Post Holdings Co, a provider of postal, banking and insurance services, sometime in the next several months, while smartphone messaging application Line Corp. is preparing for a Tokyo and possibly New York listing this summer. Real-estate investment trust Kenedix Retail REIT Corp, which raised $506 million in February, is the biggest IPO in Japan this year so far, according to data provider Dealogic.

Goldman Sachs Group Inc. and Asian private-equity firm MBK Partners are major investors in the firm, the person said. A spokesman for USJ declined to comment.

Universal Studios Japan opened in 2001 and made its debut in 2007 on the Tokyo Stock Exchange's Mothers market for startup companies. But struggling with decreasing visitors, USJ was delisted in 2009 when Goldman injected capital into the company.

In January, USJ said the theme park in Osaka had drawn its 10 millionth visitor since the beginning of the fiscal year in April 2014. The theme-park operator succeeded in boosting visitor numbers last year, thanks to the Wizarding World of Harry Potter, which opened in July. The attraction features a village and castle inspired by J.K. Rowling's popular book and movie series. Other attractions in the theme park include Spider-Man, Sesame Street and Jurassic Park.

Atsuko Fukase contributed to this article.

Write to Yvonne Lee at yvonne.lee@wsj.com

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