Just to reiterate what has already been said before, this drop today was most likely due to the distribution by Yorktown. Yorktown, distributes shares to investors in its various partnerships rather than selling the shares and distributing cash. This allows investors the option of cashing out or to let it ride, meaning that while over 700K shares were disbursed, it is not likely that all of them will hit the market. I have been tracking them for some time, here is the breakdown of the disbursements.
I have tried to put them into a column but yahoo always seems to rearrange them. At the rate and pace they have been going, we will see 3 more Yorktown distributions, all of them about the same size (720K) shares, and most likely, all of them spaced about 2 to 3 months apart. That will eliminate the final overhang on XTXI.