I would assume no, as some scientists/mathematicians/astrophysicist etc have tried to accound for dark matter via naked black holes. Dark matter usually outstrips most assumptions, and as it seems to lie outside of galaxies, black holes don't seem to fit the bill.
That is, unless totally naked (no matter around them or gas), then we would see a faint glow around some galaxies as little jets of gas/stars/wondering rocks hit the black holes. We see none, hence it is "dark" matter, not "warmed and glowing with a snug jumper" matter. :)
However the above article suggests some early black holes could account for some of the matter. The closer we get with each slice, the closer to knowing what is left that is truly "dark", but still existing (no, not magic, just invisible like radio waves or sub atomic particles :P ).