Orix Corp., a Japanese owner of leasing and insurance businesses, agreed to buy control of Rabobank Groep’s asset-management unit for 1.94 billion euros ($2.6 billion) in its largest-ever acquisition.

The Japanese company will purchase a 90 percent stake in Robeco Groep NV, gaining a Dutch mutual-fund brand that dates to 1929 and Chicago-based Harbor Capital Advisors. Rabobank, the biggest Dutch savings bank and mortgage lender, will retain 10 percent of Robeco and receive as much as 150 million euros of Orix shares, the Tokyo-based company said in a statement today.

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