For Canadians, today is the last day to buy and sell stocks and debentures on the TSX and still have it count for the 2013 tax year.
The date for US securities is on the 26th because Boxing Day is not a trading holiday in the USA.
If it is your US tax return you are concerned with, you can sell securities up until December 31 to have the IRS consider it a 2013 tax year transaction.
Regardless of all of this, market movements at this time of year are on computer trading autopilot as most decision-makers with any market influence are away from their main desks.
Merry Christmas everybody.