Powell Industries Inc.

POWL·NASDAQ·$291.97Share Price as of 11/2·$11BMarket Cap as of 11/2

Financials

10-QQ3 ended 06/30/2608/04/26 10-QQ2 ended 03/31/2605/05/26 10-QQ1 ended 12/31/2502/04/26 10-KFY 202511/19/25 10-QQ3 ended 06/30/2508/06/25

Disclosures

8-KCurrent report08/03/26 8-KCurrent report07/06/26 8-KCurrent report05/05/26 8-KCurrent report05/04/26 8-KCurrent report03/31/26

Prospectuses and Registrations

S-8Registration of securities for employees05/19/23 S-8Registration of securities for employees02/09/23 S-8Registration of securities for employees05/22/14 S-8 POSPost-effective amendment (S-8)05/22/14 S-8Registration of securities for employees12/21/10

Proxies

DEF 14ADefinitive proxy01/06/26 DEF 14ADefinitive proxy01/06/25 DEFA14AAdditional proxy materials01/06/25 PRE 14APreliminary proxy12/23/24 DEF 14ADefinitive proxy01/05/24

Ownership

SC 13GBeneficial ownership10/27/26 Form 4Insider transaction10/20/26 Form 4Insider transaction10/02/26 Form 4Insider transaction10/02/26 Form 4Insider transaction10/02/26

Other

SDConflict Minerals disclosure05/26/26 SDConflict Minerals disclosure05/22/25 ARSAnnual report to shareholders01/06/25 SDConflict Minerals disclosure05/28/24 SDConflict Minerals disclosure05/25/23