Lehman Brothers has hired Stephen Roti, head of U.S. corporate equity derivatives sales with Credit Suisse First Boston in New York, as a managing director running its U.S. corporate equity derivatives business. He reports to Matt Hansen, managing director in equity structured products sales in New York, who declined comment. Roti did not return calls. Lehman spokeswoman Tasha Pelio and CSFB spokesman John Gallagher did not comment by press time.