Lars Sjumarken, head of equity derivative sales for the Nordic region at BNP Paribas in London, has left the firm. Sjumarken did not return a message left on his cell phone and the reason for the departure could not be determined. Christian Kwek, head of equity derivatives marketing in London, was traveling and could not be reached. Jean-Eric Pacini, head of structured product sales in Paris, referred calls to spokeswoman Ruth Lavelle, who confirmed the departure.