MTM is an abbreviation for "Marked To Market". It is a method used to evaluate or measure the fair market value of fluctuating assets and liabilities. In the trading and investment world, securities like mutual funds and futures are marked to market to show their current or present market value. MTM Squaring off is essentially a trading style that investors use in day trading. They buy or sell specific quantities of assets (typically shares) and reverse their transactions later in hopes of earning a profit.