This objective of this study was to determine fluctuation effect of
Composite Stock Price Index (IHSG), Interest Rate of Government Bonds, Interest
Rate of Bank Indonesia Certificates (SBI), and Inflation on Net Asset Value (NAB) of
Mixed Mutual Funds either partially or simultaneously. These results indicated
simultaneously an effect on variables of Composite Stock Price Index (IHSG),
Interest Rate of Government Bonds, Interest Rate of Bank Indonesia Certificates
(SBI), and Inflation to the net asset value (NAB) of Mutual funds. The results of
research found that, partially the fluctuation of Government Bond and inflation had no
significant impact on the net asset value (NAV) of Mixed Mutual Fund while the
Composite Stock Price Index (IHSG) and the interest rate of Bank
Indonesia Certificates (SBI) had a significant effect on the net asset value (NAB) of
mixed Mutual fund.