MASCO CORP /DE/

APPENDIX C — AMENDMENTS TO THE COMPANY’S CERTIFICATE OF INCORPORATION AND BYLAWS TO ENABLE THE ADOPTION OF SHAREHOLDERS’ RIGHT TO CALL SPECIAL MEETINGS OF SHAREHOLDERS

Amendments to the Certificate of Incorporation:

EIGHTH: Any action required or permitted to be taken by the stockholders of the Corporation must be effected at a duly called annual or special meeting of such holders and may not be effected by any consent in writing by any such holders. Except as otherwise required by law, special meetings of stockholders of the Corporation may be called only by the Chairman of the Board, the President or a majority of the Board of Directors, subject to the rights of holders of any one or more classes or series of preferred stock or any other class of stock issued by the Corporation which shall have the right, voting separately by class or series, to elect directors. Notwithstanding any other provision of this Certificate of Incorporation or the by-laws (and notwithstanding that a lesser percentage may be specified by law, this Certificate of Incorporation or the by-laws), and in addition to any affirmative vote required by law, the affirmative vote of the holders of at least a majority of the voting power of the outstanding capital stock of the Corporation entitled to vote, voting together as a single class, shall be required to amend, adopt in this Certificate of Incorporation or in the by-laws any provision inconsistent with, or repeal this Article EIGHTH.

Amendments to the Bylaws:

Section 1.02. Special Meetings. Except as otherwise required by law, special meetings of stockholders of the Corporation may be called only by the Chairman of the Board, the Chief Executive Officer, the President or a majority of the Board of Directors, subject to the rights of holders of any one or more classes or series of preferred stock or any other class of stock issued by the Corporation which shall have the right, voting separately by class or series, to elect Directors. Special meetings shall be held as shall be designated by resolution of the Board of Directors and set forth in the notice of such meeting, and the business transacted shall be confined to the purpose or purposes stated in the notice of the meeting.

(A) Except as otherwise required by law, special meetings of stockholders of the Corporation may be called only by (1) the Chair of the Board, the President and Chief Executive Officer or a majority of the Board of Directors or (2) the Secretary, but only upon the written request of a stockholder or group of stockholders of record of the Corporation who own (as defined in Section 1.07 of these Bylaws), as of the close of business on the Stockholder Meeting Request Record Date (as defined in Section 1.02(B)), at least twenty five percent (25%) in the aggregate of the shares of common stock of the Corporation issued, outstanding and entitled to vote, who have owned that amount of common stock continuously for at least one year, and who have complied in full with all of the requirements set forth in the Certificate of Incorporation and these Bylaws (such request, a “Stockholder Meeting Request”).

(B) No stockholder or group of stockholders may submit a Stockholder Meeting Request unless a stockholder of record has first submitted a request in writing that the Board of Directors fix a record date (such date, a “Stockholder Meeting Request Record Date”) for the purpose of determining stockholders entitled to submit a Stockholder Meeting Request, which shall be in proper form and delivered to the Secretary at the principal executive offices of the Corporation. To be in proper form, such request shall (i) bear the signature and the date of signature by the stockholder of record submitting such request and (ii) include all information required to be set forth in a notice as set forth in Section 1.02(C), replacing “Stockholder Meeting Request” with “request for a Stockholder Meeting Request Record Date” and without regard to clause (3) of Section 1.02(C). Within ten (10) days after the Corporation receives a request to fix a Stockholder Meeting Request Record Date in compliance with this Section 1.02, the Board of Directors shall adopt a resolution fixing a Stockholder Meeting Request Record Date for the purpose of determining the stockholders entitled to submit a Stockholder Meeting Request, which date shall not precede the date upon which the resolution fixing the Stockholder Meeting Request Record Date is adopted by the Board of Directors. Notwithstanding anything to the contrary in this Section 1.02, no Stockholder Meeting Request Record Date shall be fixed if the Board of Directors determines that any Stockholder Meeting Request that would be submitted following such Stockholder Meeting Request Record Date could not comply with the requirements set forth in this Section 1.02.

(C) To be timely, a Stockholder Meeting Request must be delivered to the Secretary at the principal executive offices of the Corporation not later than sixty (60) days after the Stockholder Meeting Request Record Date. To be in proper form, a Stockholder Meeting Request must be in writing, must be signed and dated by the record holders (or their duly authorized agents) meeting the Holding Requirements (as defined below), must state the

MASCO 2026| APPENDIX

purpose or purposes of the proposed meeting and must include all information and representations, to the extent appliable, that would be required to be included in a notice satisfying the requirements of Section 1.05 and/or Section 1.06 of these Bylaws, as applicable. In addition to the foregoing, a Stockholder Meeting Request must include (1) a representation that a stockholder submitting the Stockholder Meeting Request or a qualified representative (as defined in Section 1.05 of these Bylaws) thereof intends to appear in person or by proxy at the special meeting to present the nomination(s) or business to be brought before the special meeting, (2) an acknowledgment of the stockholder(s) submitting the Stockholder Meeting Request that any disposition by such stockholder(s) after the date of the Stockholder Meeting Request of any shares of the Corporation’s common stock shall be deemed a revocation of the Stockholder Meeting Request with respect to such shares and that such shares will no longer be included in determining whether the Holding Requirement (as defined below) has been satisfied, (3) documentary evidence that the ownership of common stock of the stockholders submitting a Stockholder Meeting Request complies with the amount, type and length of ownership requirements set forth in this Section 1.02 (the “Holding Requirement”) as of the Stockholder Meeting Request Record Date; provided, however, that if such stockholders are not the beneficial owners of the shares representing the Holding Requirement, then to be valid, the Stockholder Meeting Request must also include documentary evidence (or, if not simultaneously provided with the Stockholder Meeting Request, such documentary evidence must be delivered to the Secretary within ten (10) days after the date on which the Stockholder Meeting Request is delivered to the Secretary) that the beneficial owners on whose behalf the Stockholder Meeting Request satisfy the Holding Requirement, and (4) a commitment by such stockholder(s) to continue to satisfy the Holding Requirement through the date of the requested special meeting of the stockholders and to notify the Corporation upon any disposition of any shares of common stock.

(D) In determining whether a special meeting of the stockholders has been requested by stockholders satisfying, in the aggregate, the Holding Requirement, multiple Stockholder Meeting Requests delivered to the Secretary will be considered together only if each such Stockholder Meeting Request (1) identifies substantially the same purpose or purposes of the special meeting of stockholders of the Corporation and substantially the same matters proposed to be acted on at the special meeting, as determined by the Board of Directors (which, if such purpose is the removal of one or more directors, will mean that each Stockholder Meeting Request includes an identical list of directors proposed to be removed at the special meeting), and (2) has been dated and delivered to the Secretary within sixty (60) days of the first date on which a Stockholder Meeting Request relating to such purpose or purposes is delivered to the Corporation.

(E) Each stockholder submitting a Stockholder Meeting Request shall further update and supplement the information previously provided to the Corporation in connection with the Stockholder Meeting Request so that it is true and correct (1) as of the Stockholder Meeting Request Record Date and (2) as of the date that is fifteen (15) days prior to the special meeting or any adjournment or postponement thereof, with such updated or supplemental information being delivered to the Secretary of the Corporation at its principal executive within five (5) business days after the date as of which the information is required to be updated or supplemented. For the avoidance of doubt, the obligation to update and supplement as set forth in this Section 1.02 shall not limit the Corporation’s rights with respect to any deficiencies in any request provided by a stockholder, extend any applicable deadlines under these Bylaws or enable or be deemed to permit a stockholder who has previously submitted a request under these Bylaws to amend or update any proposal or to submit any new proposal, including by changing or adding nominees, matters, business and/or resolutions proposed to be brought before the special meeting of stockholders.

(F) Any stockholder submitting a request for a Stockholder Meeting Request Record Date or a Stockholder Meeting Request may revoke such stockholder’s request at any time by written revocation delivered to the Secretary at the principal executive offices of the Corporation. If, at any time after a Stockholder Meeting Request is delivered to the Corporation, the unrevoked requests from stockholders submitting a Stockholder Meeting Request (whether revocation is determined by specific written request or deemed revocation pursuant to clause (2) of paragraph C of this Section 1.02) do not satisfy the Holding Requirement applicable to the Stockholder Meeting Request, the Board of Directors may determine not to call the special meeting or may cancel the special meeting if already called. The stockholders submitting a Stockholder Meeting Request shall certify in writing to the Secretary on the day prior to the requested special meeting of stockholders as to whether such stockholders continue to satisfy the Holding Requirement.

(G) The Secretary shall not set a Stockholder Meeting Request Record Date or call a special meeting of stockholders of the Corporation in response to a Stockholder Meeting Request if (1) the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request relates to an item of business that is not a proper subject for stockholder action under applicable law; (2) the Stockholder Meeting Request includes an item of business that did not appear in the request for a Stockholder Meeting Request Record Date; (3) the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request is received during the period commencing ninety (90) days prior to the first anniversary of the annual meeting of stockholders for the immediately preceding annual meeting and ending on the date of the next annual meeting; (4) an identical or substantially similar item (as determined by the Board of Directors, a “Similar Item”) was presented at any meeting of stockholders of the Corporation held not more than twelve (12) months before the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request was received (provided that for purposes of this clause (4), an election of directors at any such meeting shall not be deemed to be a Similar Item with respect to a proposal to remove one or more directors); (5) the action relates to a removal of directors occurring at any time within ninety (90) days after any meeting of stockholders for the election of directors; (6) a Similar Item is included in the Corporation’s notice of meeting as an item of business to be brought before a meeting of stockholders of the Corporation that has been called prior to receipt of the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request but has not yet been held or that is called for a date within ninety (90) days after the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request is received; or (7) the request for a Stockholder Meeting Request Record Date or Stockholder Meeting Request was made in a manner that does not comply with the requirements of these Bylaws, including, without limitation, this Section 1.02, and the Certificate of Incorporation or that involved a violation of Regulation 14A under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or other applicable law.

(H) If none of the stockholders submitting the Stockholder Meeting Request appears or sends a qualified representative to present the nomination and/or business to be presented for consideration as specified in the Stockholder Meeting Request, the Corporation need not present such nomination and/or business for a vote at the special meeting, notwithstanding that proxies in respect of such nomination and/or business may have been received by the Corporation.

(I) Only such business shall be conducted at a special meeting of stockholders as specified in the notice of meeting (or any supplement thereto) given by or at the direction of the Board of Directors. Nothing contained herein shall prohibit the Board of Directors from submitting additional matters to the stockholders at any special meeting of stockholders requested by stockholders.

(J) Special meetings of stockholders called pursuant to this Section 1.02 shall be held at such place, if any, on such date, and at such time as the Board of Directors shall fix; provided, however, that the special meeting called pursuant to a Stockholder Meeting Request shall not be held more than ninety (90) days after receipt by the Corporation of a valid Stockholder Meeting Request.

17450 COLLEGE PARKWAY

LIVONIA, MI 48152

VOTE BY INTERNET

Before The Meeting- Go towww.proxyvote.com or scan the QR Barcode above

Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 P.M. Eastern Time on Thursday, May 7, 2026. Have your proxy card in hand when you access the website and follow the instructions to obtain your records and to create an electronic voting instruction form.

During The Meeting- Go towww.virtualshareholdermeeting.com/MAS2026

You may attend the meeting via the Internet and vote during the meeting. Have the information that is printed in the box marked by the arrow available and follow the instructions.

ELECTRONIC DELIVERY OF FUTURE PROXY MATERIALS

If you would like to reduce the costs incurred by our company in printing and mailing proxy materials, you can consent to receiving all future proxy statements, proxy cards and annual reports electronically viae-mail or the Internet. To sign up for electronic delivery, please follow the instructions above to vote using the Internet and, when prompted, indicate that you agree to receive or access proxy materials electronically in future years.

VOTE BY PHONE -1-800-690-6903

Use any touch-tone telephone to transmit your voting instructions up until 11:59 P.M. Eastern Time on Thursday, May 7, 2026. Have your proxy card in hand when you call and then follow the instructions.

VOTE BY MAIL

Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717.

TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS:

V85788-P45118 KEEP THIS PORTION FOR YOUR RECORDS

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DETACH AND RETURN THIS PORTION ONLY

THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED.

Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer.

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting:

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V85789-P45118

MASCO CORPORATION THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS FOR THE ANNUAL MEETING OF STOCKHOLDERS MAY 8, 2026 The undersigned stockholder(s) hereby appoint(s) Jonathon J. Nudi and Kenneth G. Cole, or either of them, as proxy holders, each with the power to appoint his substitute, and hereby authorize(s) them to represent and to vote, as designated on the reverse side of this proxy, all of the shares of Common Stock of MASCO CORPORATION that the stockholder(s) is/are entitled to vote at the Annual Meeting of Stockholders (the “Meeting”) to be held at 8:30 A.M. Eastern Time on Friday, May 8, 2026, virtually at www.virtualshareholdermeeting.com/MAS2026, and any adjournment or postponement thereof, and to vote in their discretion on any other matters that may come before the meeting or any adjournment or postponement thereof. THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED AS DIRECTED BY THE STOCKHOLDER(S). IF NO SUCH DIRECTIONS ARE MADE, THIS PROXY WILL BE VOTED “FOR” THE ELECTION OF THE NOMINEES LISTED IN PROPOSAL 1 , “FOR” PROPOSALS 2, 3, 4, 5 AND 6 AND “AGAINST” PROPOSAL 7. The undersigned hereby acknowledge(s) prior receipt of a Notice of Annual Meeting of Stockholders of the Company called for May 8, 2026, the Proxy Statement for the Annual Meeting and the 2025 Annual Report to Stockholders. PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED REPLY ENVELOPE. Continued and to be signed on reverse side