1 unchanged sentence
Insider Adoption or Termination of Trading Arrangements
−Removed: On February 11, 2026 , Richard E.
−Removed: Williams , Director of the Company , adopted a “Rule 10b5-1 trading arrangement,” as the term is defined in Item 408(a) of Regulation S-K, for the sale of up to 7,500 shares of the Company’s common stock as adjusted for the Stock Split, subject to certain conditions, from May 14, 2026 through December 31, 2026 .
−Removed: On February 27, 2026 , Mohit Singh , Director of the Company , adopted a “Rule 10b5-1 trading arrangement,” as the term is defined in Item 408(a) of Regulation S-K, for the sale of up to 1,350 shares of the Company’s common stock as adjusted for the Stock Split, subject to certain conditions, from May 28, 2026 through February 26, 2027 .
+Added: During the third quarter of Fiscal 2026, none of our directors or officers adopted or terminated any “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Regulation S-K, Item 408.
Number Description of Exhibits
11 unchanged sentences
Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
−Removed: *101 — The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, formatted in Inline XBRL:
+Added: *101 — The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, formatted in Inline XBRL:
(i) Condensed Consolidated Balance Sheets (Unaudited);
4 unchanged sentences
and (vi) Notes to Condensed Consolidated Financial Statements (Unaudited), tagged as blocks of text and including detailed tags.
−Removed: *104 — The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, formatted in Inline XBRL (included as Exhibit 101).
−Removed: § Management contracts and compensatory plans or arrangements
+Added: *104 — The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, formatted in Inline XBRL (included as Exhibit 101).
* Filed herewith
2 unchanged sentences
POWELL INDUSTRIES, INC.
−Removed: May 5, 2026 By:
+Added: August 4, 2026 By:
President and Chief Executive Officer
(Principal Executive Officer)
−Removed: May 5, 2026 By:
+Added: August 4, 2026 By:
/s/ Michael W.
3 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.