Page 4 - Martin Marietta - 2024 Proxy Statement

Sustainability Priorities
We believe that Martin Marietta has a proactive, responsible, and principled approach to climate change, including setting
meaningful and realistic targets and keeping promises. We believe these strategies and risk-mitigation efforts are robust to
address the Company’s climate risks and benefit from climate-related opportunities. We continue to enhance our
disclosure on these matters and our engagement with shareholders to more fully explain the Company’s priorities in these
important areas. In addition to our year-round dialogue with our shareholders on a variety of topics, in the fall of 2023 we
undertook a Fall Engagement Program. This included contacting our top 40 shareholders to discuss feedback we received
during the year on climate matters and our compensation program design.

We made substantial progress on our sustainability journey in the last year. Among other things, during 2023:
• We established our ambition to be Net Zero by 2050 across our entire value chain.
• We submitted our commitment letter to the Science Based Targets initiative (SBTi) and have started gathering Scope 3
emissions data for purposes evaluating those emissions against SBTi’s target threshold in accordance with SBTi
procedures.
• We submitted additional responses and information to Climate Action 100+ including our Net Zero GHG emissions
ambition by 2050, a long-term GHG reduction target, and a comprehensive roadmap to decarbonization.
• We submitted responses to the CDP Climate and Water surveys scoring a C on both and setting a baseline for future
improvements.
• We designed a new Political Contributions and Lobbying web page responsive to the CPA-Zicklin scorecard resulting in a
77.1 point increase in our CPA-Zicklin scores from a 10.0 in 2022 to an 87.1 in 2023, which is in the index’s top
quartile. In addition, the Company was recognized as one of the nine Most Improved Companies This Year.
• We progressed on our activities relating to several employee resource groups (ERGs), including our Women Who Build
resource group, a Military & Veterans Community and a multicultural ERG called MERGE.

Governance and Board Refreshment
Martin Marietta is committed to strong corporate governance and ensuring a diverse set of skills and backgrounds on the
Board of Directors. At the Company’s 2024 Annual Meeting of Shareholders, Michael J. Quillen, who has served on Martin
Marietta’s Board of Directors since 2008, will retire. Mr. Quillen has been a superb and insightful member of our Board;
we are extremely grateful for his steady guidance and thoughtful leadership throughout his Board tenure. He previously
served as Lead Independent Director and, most recently, as Chair of our Finance Committee. We wish him well in
retirement. Over the past nine years, we have added seven new independent directors and, this year, we are nominating
Mary T. Mack, a former Senior Executive Vice President at Wells Fargo & Company with a broad mix of banking, finance
and governance experience, to serve on our Board. Half of our independent Board nominees are diverse, including four
women, one African American director and one Hispanic director, each of whom brings strong backgrounds and
experience with publicly-traded companies and adds unique insights to our Board.

Your Vote Matters
I urge you to promptly cast your vote. You may do so by either returning the enclosed Proxy Card or by the electronic or
telephone options described in our Proxy Statement. On behalf of our Board of Directors, thank you for your investment in
Martin Marietta. We look forward to continuing to deliver strong and responsible performance, innovation and growth to
our customers, our shareholders and our other stakeholders.

Sincerely,

C. Howard Nye
Chair of the Board, President and Chief Executive Officer