The increased stake, made by July 13, makes Harris the second-biggest shareholder in Olympus after Mitsubishi UFJ Financial Group, the Nikkei newspaper's website said.
Shares in Olympus, seeking to emerge from a $1.7 billion accounting scandal, ended morning trade down 2.8 percent, underperforming a 1.7 percent rise in Tokyo's electric machinery index .IELEC.T.
(Reporting by Mayumi Negishi; Editing by Michael Watson)
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