X0206 3 2013-04-21 1 0001042825 POWER ONE INC PWER 0001091587 ABB LTD AFFOLTERNSTRASSE 44, P.O. BOX 1831 CH-8050 ZURICH, SWITZERLAND V8 SWITZERLAND 0 0 0 1 See Exhibit 99.1 No securities are beneficially owned. See Exhibit 99.1: Beneficial Ownership /s/ Richard A. Brown By: Richard A. Brown 2013-04-26 /s/ Natascia Rubinic By: Natascia Rubinic 2013-04-26