Brexit has already cost Canada several hundred million dollars in paper losses.

The value of British pounds held in federal government reserves totaled US$5.85 billion as of June 30, according to new data from the finance department. That figure compares to US$6.14 billion worth of United Kingdom currency Canada held one month earlier.

Ottawa didn’t sell any of its British pound holdings in the month, indicating the nearly US$300-million loss in value can be attributed to the British currency’s decline ever since the so-called Brexit vote on June 23, when U.K. residents voted to leave the European Union.

“Canada's reserve assets are managed in a prudent manner that is not based on expectations of currency values,” said finance department spokesman Jack Aubry in a statement to BNN.  

The day before that vote, federal Finance Minister Bill Morneau told BNN he was not concerned about the value of Canada’s British pound holdings, arguing Ottawa takes a longer-term perspective on how it manages foreign currency reserves.