The Houston insurer American General Corp. is buying the assets of CypressTree Investments Inc., a small, privately held investment management company in Boston, according to a regulatory filing.

Neither company would discuss the deal. However, a source familiar with American General said it would give a lift to the company's tiny mutual fund business, which was launched about a year ago. The American General Fund Group had 23 funds with $600 million of assets under management on Jan. 31, according to Lipper Inc., of Summit, N.J., a Reuters company.

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