X0306 4 2016-02-23 0 0000080420 POWELL INDUSTRIES INC POWL 0001205075 HONEYCUTT MILBURN E PO BOX 12818 HOUSTON TX 77217 0 1 0 0 Vice President, Corp Controlle Common Stock 2016-02-23 4 D 0 1600 0.00 D 13648 D Common Stock 2016-02-23 4 A 0 2400 0.00 A 16048 D Common Stock 2016-07-01 4 A 0 2500 0.00 A 17848 D Common Stock 393 I 401(k) Shares Transaction involved an amendment of an outstanding grant of RSU awards that were originally granted on October 1, 2015, resulting in the deemed cancellation and regrant of the award. Represents time-based RSU awards that will vest in three equal annual installments on the first, second and third anniversaries of October 1, 2015, subject to the Reporting Person's continued employment with the Company. Represents time-based awards that will vest 100% on the third anniversary date from the date of grant, subject to the Reporting Person's continued employment with the Company. Includes a calculation error correction. Don R. Madison, Power of Attorney for M. Honeycutt 2016-07-06