All mm's can dilute, but some are more notorious for doing so, such as VFIN, VERT, PUMA, MAXM, PERT, HDSN.
VFIN did dilute GRPS a few months ago, but the stock has not been diluting for quite some time. We should see a nice rise when we get a PR.
Others usually don't dilute, such as AUTO, NITE, ETMM, CSTI.
Hope this helps.