On September 27th 2018,  we made the following updates to our trading engine. These changes may affect the way you do margin* trading.

Funds used in spot positions on margin are now withheld.

• This will prevent traders from converting their margin collateral into a non-collateral currency (which could cause a liquidation).
• This will also prevent margin collateral from being converted into other collateral currencies.
• Collateral withheld per position is approximately the cost of the position divided by the leverage used, and then adjusted by the current profit/loss of the position.

Calculations for available margin have been updated.

• Profit/loss and open orders are now taken into account when placing a new order.
• Margin orders can no longer be placed using margin that is also being used in a different margin order. Previously, these orders would fail upon being triggered. Now the orders fail at creation.
• Buy-side and sell-side margin withholdings are not withheld in the opposite direction, up to the point of the original order. For example, if you have a 5 BTCUSD sell order that maxes out your margin, you can still place a 5 BTCUSD buy order (but not a 6 BTCUSD buy).
  

*Availability of margin trading services is subject to certain limitations and eligibility criteria.