Some traders noted that the trades were especially suspicious since many of the options expired at
the end of the trading session.
Spikes occur whenever liquidity is scarce, for example at
the end of a trading session when liquidity providers roll over their activities to the next day.
Day Order: Orders expire at
the end of the trading session 4:00 pm (CT) Monday - Friday for most markets with a few exceptions.
The period at
the end of the trading session.
Market - on - Close An order to buy or sell at
the end of the trading session at a price within the closing range of prices.
I have had instances where I would tell my stockbrokers something and he would later tell me at
the end of the trading session that what I mentioned to him earlier was true.
An order that if not executed expires automatically at
the end of the trading session on the day it was entered.
Sold it all but just before
the end of the trading session I bought it all back at the highest price as u can see on the chart it went lower and lower.