X0303 4 2010-06-15 0 0000080420 POWELL INDUSTRIES INC POWL 0001219199 POWELL THOMAS W PO BOX 12818 HOUSTON TX 77217 1 0 1 0 Common Stock 2010-06-15 4 A 0 2000 0.00 A 777749 D Common Stock 1798628 I Held in TWP Holdings Common Stock 818 I Held in 401K Common Stock 26605 I Held in TWP Trust Common Stock 3815 I ESOP Shares Restricted stock grant is subject to forfeiture - restrictions lapse with respect to 1,000 shares on the first anniversary from the date of the grant, and restrictions lapse with respect to the remaining 1,000 shares on the second anniversary from the date of the grant. Includes 3,000 shares of restricted stock that have time-based vesting provisions, and 234,255 shares of the Company's common stock that Mr. Powell transferred from the Thomas Walker Powell Trust to his direct ownership. Corrects the total amount of direct ownership shares by 12,828 shares for the 2008 equity compensation distribution not previously included. Transferred 234,255 shares of the Company's common stock from the Thomas Walker Powell Trust to direct ownership. Don R. Madison, Power of Attorney for Thomas W. Powell. 2010-06-17