Today is a monthly options expiration day. A casual survey suggests that the $450 strike could be the most profitable closing share price target for big options writers (mainly hedge funds and market makers). Trading volume is low today, which may make it easier for manipulators to nudge the share price toward their targets. Share price manipulation is costly, but can be largely covered on Monday. The point is that options expiring today cannot be traded next week. The manipulators hope for modest not massive profits. Nevertheless, many owners of expiring calls and puts could be shut out. Of course news or investor interest can upset the plans of manipulators.