Deutsche Bank lost €35m on a block trade of shares in the US power company Dominion Energy Midstream Partners in February, according to people familiar with the matter, another example of the dangers of block trade bidding by banks.

First-quarter revenues in the German lender's equities origination business halved to €76m year-on-year, it revealed on Thursday — about half of which was attributable to the loss-making trade, it said.