Japan's Prime Minister Shinzo Abe has praised Rakuten Inc. CEO Hiroshi Mikitani for always speaking his mind, but the head of the country's biggest online shopping mall had little praise for a securities analyst who did just that.

In a rare attempt to shame an analyst via a public filing on the Tokyo Stock Exchange, the e-commerce giant blasted Mitsubishi UFJ Morgan Stanley Securities analyst Masato Araki for a report that downgraded the company to "Underperform" from "Neutral."

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