One year into the historic vote, Brexit has caused all sorts of uncertainty in the UK’s politics and economy. Now it appears the uncertainty extends the very top of corporate leadership: the boardroom. The nation’s largest publicly-traded firms are on pace to appoint about 20 percent fewer non-executive directors than usual this year. The same thing happened last year, when those large firms—which compose the FTSE 350 index—brought on 23 percent fewer directors than average. The numbers were compiled in Korn Ferry’s “Class of 2016,” a review of non-executive board members in the UK.