Price volatility and changes in global market liquidity can result in large spread increases around market openings and closings, following news announcements, and during times of uncertainty. At such times, our spreads usually widen to reflect market conditions. However, there may be occasions during which we opt to implement a fixed spread rather than allowing a spread to continue to widen.
If you leave trades open during the weekend or before markets close, or in the event that a particular market is suspended, you cannot close them until the markets reopen. Note that prices may change significantly or "gap" when trading resumes. If prices move against you, a margin closeout may be triggered when trading resumes if you have insufficient funds on your account to support your trading.
Spreads (the difference between the bid price and the ask price) typically widen just prior to closure of the markets and when they open, to reflect decreased liquidity in the global markets. These widened spreads could trigger stop-loss orders or margin closeouts when a position is open at this time.