Earlier, we said that the 
FIX Protocol not only increased the
 speed of traders in the market, but also provided an opportunity for market participants to use 
limit orders, which reduced the risks of trading. Let's take a closer look at two types of limit orders. 
Let's start with the 
FOK order.
Literally, its name stands for - 
'Fill Or Kill'. The essence of this order is that it is
 executed immediately and in 
full at the stated price, or will not be executed at all, which eliminates the possibility of slippage. Thus, if your order
 cannot be executed in full, then the order is
 simply rejected, if the order 
can be executed in full, then the 
order is executed in full at the specified price. [nerd] This type of order is very 
convenient for 
scalping or 
arbitrage strategies, as they 
eliminate the risk of slippage. In fact, we can say that the 
"Edward – Scissorhands" arbitrage strategy from StockSharp 
eliminates risks. Below is an example of the rejection of the 
FOK order in the 
CME system, due to the fact that the 
order size is 20, and the
 book contains only 19, so the order 
can not be executed completely, and the system cancels it. 

The next type of limit orders are 
IOC orders. 
The name 
'Immediate OR Cancel' means that the 
order is executed in whole or in part at the set price, otherwise the order will be canceled. For example, if the 
order size is 100 units, only 
50 units can be sold at the set price. If we use an order of type 
FOK, the system will cancel it, as it can not be fully executed. When using the 
IOC limit order, the order will be 
executed for 50 units, and the 
remaining ones will be canceled. 
IOC also has another name 
FAK, which stands for 
'Fill And Kill', executed and discarded the remainder.[nerd]
For example, an 
IOC order will be partially executed (in the 
CME system, its name is 
FAK). If we 
buy 15, and the book 
contains only 10, then we 
buy 10, and the 
remaining 5 are rejected, so this order can be called partially executable:
 Limit orders
Limit orders when working through the 
FIX Protocol allow the trader to 
reduce risks, and in some cases, especially when working with 
arbitrage strategies to 
reduce them to zero. Our company provides a range of programs to work in the market through 
FIX connect, such as: designer trading strategies 
Designer, trading program 
Terminal. We also provide a full range of connectors for connection to trades, including FIX. Flexible system of discounts and reliability of connection, makes us one of leaders in the market. The full range of connectors and software can be found on our 
website.