Monitor stand

FIG. 1 is a front, top, and left side perspective view of a monitor stand embodying the new design;

FIG. 2 is a back, top, and right side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

Broken lines are used to illustrate features of the monitor stand that form no part of the claimed design.