I don't remember seeing it since Orochimaru's death.
There are three options, as I see it:
1. Sasuke - He has his own sword, though and doesn't seem to carry it.
2. Kabuto - Who knows what is under that robe. Although he would've used it by now, I'd think.
3. Madara - This is a completely outside chance, but he does do post-mortum collecting.
Genuinely curious since this sword is a legendary weapon. Has someone used it since Orochimaru's lame death, am I wrong?