The Spectrem Millionaire Investor Confidence Index advanced 5 points in April to negative 1, the highest level since December 2007, when it stood at 8.
The broader survey of affluent investors, those with $500,000 or more in investable assets, rose 3 points in April to negative 9. This neutral reading is also the index's highest since December 2007, when it stood at zero.
"The Dow Jones Industrials surpassing the 11,000 mark was clearly a positive for the nation's wealthiest investors. However, the outlook of both groups remains neutral with some lingering uncertainty about the economy - specifically, unemployment levels," said George H. Walper, Jr., president of Spectrem Group in a press release.
When asked about the one factor that most affects their investment plans, affluent investors in April cited: stock market conditions (21%); the economic environment (16%); household cash flow (8%); household income (7%); retirement (7%) and the political climate (4%).
Millionaires were slightly more focused on the economy (21%) than the affluent, but less focused on stock market conditions (20%).
The Spectrem Affluent Investor Confidence Index is based on 250 monthly interviews. The data have a margin of error of plus or minus 6.2 percentage points.