Shares in Osram (OSRn.DE) rose almost 15 percent on Tuesday after Bloomberg reported that private equity firm Bain Capital was exploring a takeover bid for the German lighting group, citing people with knowledge of the matter.

Osram declined to comment.

Bain is working with financial advisers in assessing a business with a market value of almost 3.9 billion euros ($4.4 billion), the report said.

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