Quote from Brendan R:
Final Settlement Day is the third Friday of each expiration month if this is an exchange day; otherwise the exchange day immediately preceding that day. Close of trading in the expiring option series on the Last Trading Day is at the beginning of the Xetra intraday auction starting at 13:00 CET
but
can only be exercised on the Final Settlement Day of the respective option series until the end of the Post-Trading Full Period (21:00 CET)
so trading ends at 13:00 CET but exercise window closes at 21:00 which means...
many things can happen between 13:00 CET and 21:00 CET.
Do u believe open interest in options have extreme effects on th expiration
