XB (Price Addendum)
A price addendum is a code that is added to the price in floor trading. It states in what way the respective order situation is to be taken into account as the price is fixed. This information is part of the tick data.
XB as a price addendum indicates that the order was executed within the scope of Xetra BEST. Xetra BEST exclusively handles orders from private investors. These orders are executed immediatedly and at a better price than in the current Xetra order book.
Private investors have the possibility to track all Xetra BEST trades from the previous 5 days, and compare the "improved" Xetra BEST prices with those available in the Xetra orderbook at the time of execution.