Thanx Mackie.... Spotted it on my myTrack. Trouble is, my Track displays it inappropriately. Can't define it when it happens on myTrack.
Basically, it is a case where two exact smae size trades happen simultaneously. Since it is absurd to presume that somebody was sitting out ther just waiting to supply arch with his 171140 shares, it must be an internal event at a particular MM. The MM made .005 on the deal just like that. Is that the deal here?