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We have one class of securities, our common stock, registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Our common stock is listed for trading on the Nasdaq Global Market under the symbol “POWL.” Our authorized capital stock consists of 30,000,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share. The following description of our capital stock is a summary and does not purport to be complete. It is subject to and qualified in its entirety by our certificate of incorporation (as may be amended or restated from time to time, “Certificate of Incorporation”) and amended and restated bylaws, as amended (as may be further amended or restated from time to time, “Bylaws”), each of which is filed as an exhibit to our Annual Report on Form 10-K. We encourage you to read the complete text of our Certificate of Incorporation and Bylaws. Unless otherwise indicated, all references to “we,” “us,” “our,” or “the Company” are to Powell Industries, Inc.

Holders of our common stock are entitled to one vote for each share held of record on all matters submitted to a vote of stockholders, may not cumulate votes in the election of directors and have no preemptive rights. Our Bylaws provide that: in all matters other than the election of directors, the affirmative vote of the holders of a majority in voting power of shares present in person or represented by proxy and entitled to vote on the subject matter at a meeting at which a quorum is present shall be the act of the stockholders, unless a different or minimum vote is required by the Certificate of Incorporation, the Bylaws, or any rule, law, or regulation applicable to the Company, its securities or the matter to be voted upon, in which case such different or minimum vote shall be the required vote for such matter; and directors shall be elected by a plurality of the votes of the shares present or represented by proxy at a meeting at which a quorum is present and entitled to vote on the election of directors.

Upon any liquidation of the Company, and after holders of our preferred stock of each series have been paid in full the amounts to which they respectively are entitled or a sum sufficient for such payment in full has been set aside, the remaining net assets of the Company shall be distributed pro rata to the holders of our common stock, to the exclusion of holders of our preferred stock.

The Board is authorized to issue up to 5,000,000 shares of preferred stock in one or more series and to fix by resolution or resolutions providing for the issuance of each such series the voting powers, designations, preferences and relative, participating, optional or other special rights, and qualifications, limitations or restrictions thereof, of such series. No holders of any series of our preferred stock will be entitled to receive any dividends thereon other than those specifically provided for by our Certificate of Incorporation or the resolution or resolutions of the Board providing for the issuance of such series of our preferred stock. Upon any liquidation of the Company, whether voluntary or involuntary, the holders of our preferred stock of each series will be entitled to receive only such amount or amounts as will have been fixed by or Certificate of Incorporation or by the resolution or resolutions of the Board providing for the issuance of such series. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of the Company without any vote or action by stockholders and may adversely affect the voting and other rights of the holders of shares of our common stock.

Our Certificate of Incorporation provides that no director of the Company shall be liable to the Company or its stockholders for monetary damages for breach of fiduciary duty as a director, which such limitation shall not eliminate or limit the liability of a director (a) for any breach of the director’s duty of loyalty to the Company or its stockholders, (b) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (c) under Section 174 of the General Corporation Law of the State of Delaware (the “DGCL”) or (d) for any transaction from which the director derived an improper personal benefit. Our Certificate of Incorporation provides that no officer of the Company shall be liable to the Company or its stockholders for monetary damages for breach of fiduciary duty as an officer, which such limitation shall not eliminate the liability of an officer (w) for any breach of the officer’s duty of loyalty to the Company or its stockholders, (x) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (y) for any transaction from which the officer derived an improper personal benefit or (z) for any action by or in the right of the Company. This limitation may have the effect of reducing the likelihood of derivative litigation against directors and officers and may discourage or deter stockholders or management from bringing a lawsuit against directors and officers for breach of their duty of care, even though such an action, if successful, might otherwise have benefited our stockholders.

General. Certain provisions of our Certificate of Incorporation and Bylaws and Delaware law could have the effect of delaying, deferring or preventing a change in control or the removal of existing management, of deterring potential acquirors from making an offer to stockholders and of limiting any opportunity to realize premiums over prevailing market prices for our common stock in connection therewith. This could be the case notwithstanding that a majority of stockholders might benefit from such a change in control or offer.

Board of Directors. Our Bylaws divide the members of the Board into three classes, serving three-year staggered terms. No decrease in number of directors shall shorten the term of any incumbent director. The classification of directors makes it more difficult for stockholders to change the composition of the Board: at least two annual meetings of stockholders may be required for stockholders to change a majority of the directors, whether or not a plurality of stockholders favors such a change.

Stockholders may remove directors from office only for cause by the affirmative vote of stockholders holding a majority in voting power of the shares entitled to vote at an election of directors. Vacancies on the Board or newly created directorships resulting from an increase in the number of directors on the Board may be filled only by the vote of a majority of the remaining directors, although less than a quorum, or by a sole remaining director. The number of directors may be fixed by resolution of the Board but must be no less than three nor more than eleven.

Advance Notice of Stockholder Proposals and Director Nominations. Our Bylaws contain provisions requiring that advance notice be delivered to us of any business to be brought by a stockholder before an annual meeting of stockholders and providing for certain procedures to be followed by stockholders in nominating persons for election to the Board. Generally, the advance notice provisions provide that the stockholder must give written notice to our Secretary, (i) if such meeting is to be held on a date that is not more than 30 days in advance of the anniversary of the previous year’s annual meeting and not later than 60 days after the anniversary of the previous year’s annual meeting, not less than 90 days nor more than 150 days prior to the anniversary date of the immediately preceding annual meeting of stockholders or (ii) for any other annual meeting of stockholders, including in the event that no annual meeting was held in the immediately preceding year, not earlier than the close of business on the 120th day prior to the annual meeting and not later than the close of business on the later of the 90th day prior to the annual meeting and the 10th day following the earlier of the day on which the notice of such meeting was mailed to

Special Meetings of Stockholders. Our Bylaws allow only the chair of the Board, the chief executive officer, the president or a majority of the directors to call a special meeting of the stockholders. Only business within the purpose or purposes described in the notice of the special meeting of the stockholders may be conducted at the meeting.

Amendment of Bylaws. Our Bylaws may be adopted, amended or repealed if approved by at least seventy-five percent (75%) of the Board. Our Bylaws may also be adopted, amended or repealed by stockholders entitled to vote; provided that any proposal by a stockholder to amend the Bylaws will be subject to the provisions of Article 2 of the Bylaws except as otherwise required by law.

Delaware Anti-Takeover Statute. As a Delaware corporation, we are subject to Section 203 of the DGCL. In general, Section 203 prevents us from engaging in a business combination with an “interested stockholder” (generally, a person owning 15% or more of our outstanding voting stock) for three years following the time that person becomes a 15% stockholder unless either:

•upon completion of the transaction that resulted in the stockholder’s becoming a 15% stockholder, the stockholder owns at least 85% of our voting stock outstanding at the time the transaction began (excluding stock held by directors who are also officers and by employee stock plans that do not provide employees with the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer); or

Under Section 203, these restrictions also do not apply to certain business combinations proposed by a 15% stockholder following the disclosure of an extraordinary transaction with a person who was not a 15% stockholder during the previous three years or who became a 15% stockholder with the approval of a majority of our directors. This exception applies only if the extraordinary transaction is approved or not opposed by a majority of our directors who were directors before any person became a 15% stockholder in the previous three years, or the successors of these directors.

Exclusive Forum for Adjudication of Disputes. Our Bylaws provide that unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall, to the fullest extent permitted by applicable law, be the sole and exclusive forum for (a) any derivative action or proceeding brought on our behalf, (b) any action asserting a claim of breach of a fiduciary duty owed by any director, officer, employee or stockholder of the Company, (c) any action asserting a claim arising pursuant to any provision of the DGCL, the Certificate of Incorporation, or the Bylaws (as either may be amended from time to time), or as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware, or (d) any action asserting a claim governed by the internal affairs doctrine or asserting an “internal corporate claim” (as that term is defined in Section 115 of the DGCL). In addition, unless we consent in writing to the selection of an alternative forum, the Federal District Courts of the United States of America shall be the sole and exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended (the “Securities Act”).

Under the Securities Act, federal and state courts have concurrent jurisdiction over all suits brought to enforce any duty or liability created by the Securities Act, and stockholders cannot waive compliance with the federal securities laws and the rules and regulations thereunder. The exclusive forum provision would not apply to suits brought to enforce any liability or duty created by the Exchange Act, or any other claim for which the federal

courts have exclusive jurisdiction. To the extent that any such claims may be based upon federal law claims, Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder. Although we believe these provisions are beneficial by providing increased consistency in the application of Delaware law or U.S. securities laws in the types of lawsuits to which they apply, the provisions may have the effect of discouraging lawsuits against our directors and officers or against us. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of and have consented to the provisions of our Bylaws related to choice of forum. The enforceability of similar exclusive forum provisions in other companies’ organizational documents has been challenged in legal proceedings, and it is possible that, in connection with one or more actions or proceedings described above, a court could rule that this provision in our Bylaws is inapplicable or unenforceable.