Michael Rosenberg, co-head of the global credit collateralized debt obligation group at UBS Securities, has been transferred from the firm's Stamford, Conn. office to London. Kris Kagel, a spokesman in New York, says basing Rosenberg in London will allow UBS to have a more consistent focus on Europe and European clients. Rosenberg did not return calls. Jeff Herlyn, who co-heads the business with Rosenberg, continues to be based in Stamford.