Janus International Group, Inc.

Below are highlights of certain information in this proxy statement (this “Proxy Statement”). As it is only a summary, it may not contain all of the information that is important to you. For more complete information, please refer to the complete Proxy Statement and Janus’s 2025 Annual Report before you vote. References to “Janus,” the “Company,” “we,” “us” or “our” refer to Janus International Group, Inc.

2026 Annual Meeting of Shareholders

The deadline for voting via the internet or by telephone is 11:59 p.m. ET on June 14, 2026. If you vote by mail, your proxy card must be received before the Annual Meeting.

Beneficial owners who own shares through a bank, brokerage firm, or similar organization can vote by returning the voting instruction form, or by following the instructions for voting via the internet or by telephone, as provided by the bank, brokerage firm, or similar organization. If you own shares in different accounts or in more than one name, you may receive different voting instructions for each type of ownership. Please vote all of your shares.

If you are a shareholder of record or a beneficial owner, you may choose to vote at the Annual Meeting. Even if you plan to attend our Annual Meeting, please cast your vote as soon as possible. For more information on voting your shares, please see the section titled “Commonly Asked Questions and Answers About the Annual Meeting.”

Electronic Delivery of Proxy Materials

As permitted under SEC rules, we are mailing a Notice of Internet Availability of Proxy Materials instead of a paper copy of these proxy materials. We believe that this process expedites receipt of our proxy materials by shareholders, while lowering the costs and reducing the environmental impact of the Annual Meeting. All shareholders will have the ability to access the proxy materials over the internet and to request a paper copy by mail or an electronic copy by e-mail by following the instructions in the notice. Shareholders who have previously requested to receive paper copies of our proxy materials will receive paper copies of the proxy materials instead of a Notice of Internet Availability.

About Janus

Headquartered in Temple, Georgia, Janus is a leading global manufacturer, supplier, and provider of turn-key self-storage, commercial, and industrial building solutions including: roll up and swing doors, hallway systems, single- and multi-story steel buildings, building components, relocatable storage “MASS” (Moveable Additional Storage Structures) units, facility and door automation technologies, and trucking terminal renovation, construction, remodeling, and maintenance services. We are highly integrated with customers at every phase of a project, including facility planning/design, construction, access control, and the restoration, rebuilding, and replacement (“R3”) of self-storage facilities.

Earlier this year, we were pleased to announce our acquisition of Kiwi II Construction (“Kiwi II”), a premier self-storage building provider, well-respected within the industry for their high-quality services and engineering prowess. Kiwi II is highly complementary to our business and expands and strengthens Janus’s exterior solutions offering and design-build capabilities.

Our common stock is listed and traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “JBI.”

Voting Matters and Board Recommendations

Our Board of Directors

Corporate Governance Highlights

We are committed to strong corporate governance practices and policies, as described below, that support effective Board leadership and prudent management practices.

Executive Compensation Preview

The “Executive and Director Compensation” section of this Proxy Statement provides a discussion of our executive compensation philosophy and the pay programs applicable to our named executive officers. Our compensation program design links compensation to the performance of our business and rewards fiscal year results through our annual incentive plan and long-term performance with equity awards.

Our Named Executive Officers

Our leadership team during the year ended January 3, 2026 (“fiscal year 2025” or “fiscal 2025”) included the following named executive officers:

Forward-Looking Statements

This Proxy Statement and the cover letter contain “forward-looking statements” regarding expectations about future business and financial results, which speak only as of the date of this Proxy Statement. Although we believe that the forward-looking statements contained in this Proxy Statement are based upon reasonable assumptions, such statements involve known and unknown risks, uncertainties, and other factors, which may cause the actual results or performance of the Company to be materially different from any future results or performance expressed or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to, those described under the headings “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in our Annual Report on Form 10-K for the year ended January 3, 2026, filed with the SEC on March 4, 2026. You are cautioned not to place undue reliance on these forward-looking statements, which are not guarantees of future performance, and actual results, developments, and business decisions may differ from those contemplated by our forward-looking statements. Except as required by law, we undertake no obligation to update such statements to reflect events or circumstances arising after the date of this Proxy Statement, and we caution investors not to place undue reliance on any such forward-looking statements.

The information on our website and the materials available through it are not incorporated by reference into this Proxy Statement.