Market regulators have been targeting poor stewardship of dark pools. The idea was the pools were an off-exchange venue where big trades could be made without moving markets. But, as Philip Stafford explains, it’s becoming harder to achieve that aim.<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes