  We have conducted a systematic search of AGNs with IMBHs from the SDSS DR4.
As results we found 245 candidates of broad-line AGN with M_{BH}<10^6 \Msun
estimated from the luminosity and width of the broad Halpha component. Compared
to the pioneer Greene & Ho (2004) sample of 19 IMBH AGNs, our sample has
improved in covering a larger range of the Eddington ratio, as well as black
hole mass and redshift, taking the advantage of our AGN-galaxy spectral
decomposition algorithm. Among these, thirty-six have L_{bol}/L_{Edd} < 0.1,
hinting that a significant fraction of IMBHs might exist with weak or no
nuclear activity.
