Confidence among affluent investors grew slightly this month.

Spectrem Group, a Chicago research firm, said its millionaire investor confidence index rose one point to minus-9, the index's sixth-straight neutral reading. Meanwhile, an index that measures the investing confidence and outlook of households with $500,000 or more in investable assets, rose two points in January to minus-13. This mildly bearish reading came after a five-point fall last month.

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