A top credit-trading exec is out at Wells Fargo. The exit comes as the bank is pursuing billions in cost cuts.

· A senior credit-trading exec is out at Wells Fargo.
· Mark Hebert, the head of high-grade credit trading, has left the company after just one year, according to people familiar with the matter. 
· Hebert had joined last July after nearly 15 years at Morgan Stanley, where he was an executive director trading corporate...