Robeco Group NV, the Dutch asset management firm, closed its purchase this week of Weiss, Peck & Greer of New York.

The deal, announced in May, bolsters Robeco's presence in the United States. Terms of the transaction were not disclosed.

However, when the deal was announced, Robeco was reported to be paying $375 million, with additional payments of $200 million over two years.

Weiss Peck manages $16 billion of assets for institutional and high-net- worth investors, a spokeswoman said.

Robeco, which is based in Rotterdam, has offices in 14 countries and is 50% owned by Rabobank, the Dutch commercial bank. Robeco's assets under management total roughly $70 billion.

Robeco already owned a minority stake in Smith Graham & Co. in Houston, a fixed-income firm.

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