Nelson Peltz’s Trian Fund Management LP revealed that it held 9.33 million shares of The Bank of New York Mellon Corporation (NYSE:BK) yesterday, and analysts are happy to have him on the scene, pointing to his successful activism at State Street Corp (NYSE:STT) as proof that he can help BK streamline its business. UBS has been calling for activist involvement for months “In our March 10th report on the trust banks, we highlighted Bank of New York Mellon Corporation (NYSE:BK) as a potential target for an activist investor, in a section titled ‘Paging Mr. Icahn (sorry, we got the activist wrong),”…