米国証券取引委員会

Washington, D. C. 20549

---

FORM 8-K

1934年証券取引所法第13条または第15条(d)に基づく最新の報告書

報告日（最も古いイベントの報告日）：2025年8月3日

---

マーティン・マリエッタ・マテリアルズ

(その憲章に明記された登録者の正確な名称)

---

Form8-Kの提出が、以下の条項のいずれかに基づく登録者の提出義務を同時に満たすことを意図している場合は、以下の該当するチェックボックスをチェックしてください：

法第12条(b)に従って登録された証券：

登録者が1933年証券法規則405（本章230.405節）または1934年証券取引法規則12b-2（本章240.12b-2節）で定義される新興成長企業であるかどうかをチェックマークで示す。

Emerging growth company  ☐

新興成長企業の場合、登録者が取引所法第13条(a)に従い提供される新規または改訂された財務会計基準に準拠するための移行期間の延長を利用しないことを選択した場合は、チェックマークで示す。☐

項目2.02 経営成績および財政状態

2025年8月4日、マーティン・マリエッタ・マテリアルズ・インク（以下「マーティン・マリエッタ」または「当社」）は、2025年6月30日に終了した第2四半期の暫定決算を発表するプレスリリースを発表しました。当社は、2025年8月7日（木）午前10時（米国東部時間）からの2025年第2四半期決算電話会議において、第2四半期の全決算と通期の見通しを発表する予定です。2025年6月30日に終了した四半期については、同日朝、市場が開く前に全決算を発表する予定である。プレスリリースのコピーは別紙99.1として添付され、参照することによりここに組み込まれる。

本Form 8-Kの項目2.02に記載された情報は、添付の別紙99.1を含め、米国証券取引委員会（以下「SEC」）に提出されたものであり、1934年証券取引所法（以下「取引所法」）第18条において「提出された」とみなされるものではなく、また同条の適用を受けるものでもありません。本情報は、1933年証券法（改正後）または証券取引法に基づくいかなる提出書類においても、当該提出書類において明示的に言及されている場合を除き、参照により組み込まれるものとはみなされません。

項目7.01.FD規制の開示。

2025年8月4日、当社は同プレスリリースにおいて、(i) 当社とデラウェア州法人 Quikrete Holdings, Inc、デラウェア州法人、以下「クイックリート社」）との間で2025年8月3日付株式・資産交換契約（以下「本交換契約」）が締結され、当社はクイックリート社のミッドロシアン・セメント工場およびテキサス州北部の生コン工場におけるセメントおよび生コン事業に関連する資産をクイックリート社に譲渡する代わりに、クイックリート社のバージニア州、ミズーリ州、カンザス州および西部における骨材事業に関連する資産をクイックリート社に譲渡することに合意した、また、(ii)ネバダ州、ノースカロライナ州、インディアナ州、ペンシルベニア州で事業を展開するマグネシア系製品の製造会社Premier Magnesia, LLCの買収完了。

本Form 8-Kの項目7.01に記載された情報は、添付の別紙99.1を含め、SECに提供されたものであり、証券取引法第18条において「提出」されたものとはみなされず、また同条の適用を受けるものでもありません。本情報は、1933年証券法（改正後）または証券取引法に基づくいかなる提出書類においても、当該提出書類において明示的に参照規定されている場合を除き、参照により組み込まれるものとはみなされません。

Forward-Looking Statements

投資家の皆様におかれましては、本Form 8-Kに記載されている将来に関するすべての記述にはリスクや不確実性が含まれており、また、当社が当該記述の作成時点において合理的であると誠実に判断した仮定に基づいていますが、実際の結果とは大きく異なる可能性があることにご留意ください。投資家は、これらの記述が歴史的事実または現在の事実のみに関するものではないという事実によって、これらの記述を識別することができます。将来の出来事または将来の営業もしくは財務の実績に関連する「可能性がある」、「予定である」、「可能性がある」、「はずである」、「予想する」、「信じる」、「見積もる」、「期待する」、「予測する」、「意図する」、「見通し」、「計画する」、「プロジェクトする」、「予定する」およびその他の類似の意味の言葉は、将来の見通しに関する記述を識別するためのものです。本リリースおよびその他の出版物におけるマーティン・マリエッタの将来の見通しに関する記述の一部または全部が誤っていることが判明する可能性があります。

Second-quarter results and trends described in this release may not necessarily be indicative of the Company’s future performance. The Company’s outlook is subject to various risks and uncertainties and is based on assumptions that the Company believes in good faith are reasonable, but which may be materially different from actual results. Factors that the Company currently believes could cause actual results to differ materially from the forward-looking statements in this release (including the outlook and 2025 Guidance) include, but are not limited to: the ability of the Company to face challenges, including shipment declines resulting from economic and weather events beyond the Company’s control; a widespread decline in aggregates pricing, including a decline in aggregates shipment volume negatively affecting aggregates price; the tendency of cement and ready mixed concrete sales being subject to significant changes in supply, demand and price fluctuations; the termination, capping and/or reduction or suspension of the federal and/or state fuel tax(es) or other revenue related to public construction; the impact of the new Administration on the amount available under and timing of federal and state infrastructure spending; the level and timing of federal, state or local transportation or infrastructure or public projects funding and any issues arising from such federal and state budgets, most particularly in Texas, North Carolina, Colorado, California, Georgia, Florida, Minnesota, Arizona, South Carolina and Iowa; the United States Congress' inability to reach agreement among themselves or with the Executive Branch on policy issues that impact the federal budget; the ability of states and/or other entities to finance approved projects either with tax revenues or alternative financing structures; levels of construction spending in the markets the Company serves; a reduction in defense spending and the subsequent impact on construction activity on or near military bases; a decline in energy-related construction activity resulting from a sustained period of low global oil prices or changes in oil production patterns or capital spending in response to such a decline, particularly in Texas; sustained high mortgage interest rates and other factors that have resulted in a slowdown in private construction in some geographies; unfavorable weather conditions, particularly Atlantic Ocean, Pacific Ocean and Gulf Coast storm and hurricane activity, wildfires, the late start to spring or the early onset of winter and the impact of a drought, excessive rainfall or extreme temperatures in the markets served by the Company, any of which can significantly affect production schedules, volumes, product and/or geographic mix and profitability; the volatility of fuel and energy costs, particularly diesel fuel, electricity, natural gas and the impact on the cost, or the availability generally, of other consumables, namely steel, explosives, tires and conveyor belts, and with respect to the Company’s Magnesia Specialties business, natural gas; costs of raw materials, including bitumen; continued increases in the cost of other repair and supply parts; construction labor shortages and/or supply chain challenges; labor relations risks, including unionization efforts, work stoppages or strikes, particularly in jurisdictions with increasing labor advocacy and evolving labor law frameworks; workforce demographics-related risks, including difficulty recruiting and retaining skilled employees, particularly for physically demanding roles in rural or less-populated markets; unexpected equipment failures, unscheduled maintenance, industrial accident or other prolonged and/or significant disruption to production facilities; the resiliency and potential declines of the Company’s various construction end-use markets; the potential negative impacts of outbreak of disease, epidemic or pandemic, or similar public health threat, or fear of such event, and its related economic or societal response, including any impact on the Company's suppliers, customers or other business partners as well as on its employees; the performance of the United States economy; governmental regulation, including environmental laws and climate change regulations at both the state and federal levels; future implementation of emissions-based taxes or carbon-pricing schemes and/or more stringent state or federal climate-related regulatory requirements that may materially increase cement operating costs or restrict cement production capacity; difficulty in securing timely land use approvals or environmental permits for development, expansion, or ongoing operations in the face of potentially shifting public and regulatory expectations; the outcome of environmental or land use-related proceedings, or increased costs associated with regulatory obligations linked to resource extraction, including site reclamation; transportation availability or a sustained reduction in capital investment by the railroads, notably the availability of railcars, locomotive power and the condition of rail infrastructure to move trains to supply the Company’s Texas, Southeast and Gulf Coast markets, including the movement of essential dolomitic lime for magnesia chemicals to the Company’s plant in Manistee, Michigan and its customers; increased transportation costs, including increases from higher or fluctuating passed-through energy costs or fuel surcharges, and other costs to comply with tightening regulations, as well as higher volumes of rail and water shipments; availability of trucks and licensed drivers for transport of the Company’s materials; availability and cost of construction equipment in the United States; weakening in the steel industry markets served by the Company’s dolomitic lime products; potential impact on costs, supply chain, oil and gas prices, or other matters relating to geopolitical conflicts, including the war between Russia and Ukraine, the war in Israel and related conflict in the Middle East and any potential conflict between China and Taiwan; trade disputes with one or more nations impacting the U.S. economy, including the impact of tariffs; unplanned changes in costs or realignment of customers that introduce volatility to earnings, including that of the Magnesia Specialties business; proper functioning of information technology and automated operating systems to manage or support operations; risks associated with third-party technology vendors, including exposure to cybersecurity vulnerabilities or service outages due to reliance on external software platforms or IT infrastructure; inflation and its effect on both production and interest costs; the concentration of customers in construction markets and the increased risk of potential losses on customer receivables; the impact of the level of demand in the Company’s end-use markets, production levels and management of production costs on the operating leverage and therefore profitability of the Company; the possibility that the expected synergies from acquisitions will not be realized or will not be realized within the expected time period, including achieving anticipated profitability to maintain compliance with the Company’s leverage ratio debt covenants; the strategic benefits, outlook, performance and opportunities expected as a result of acquisitions and portfolio optimization will not be realized; risks related to executive succession planning, retention and development of leadership talent critical to strategic execution, including potential adverse effects in the event of unexpected transitions or departures; changes in tax laws, the interpretation of such laws and/or administrative practices, including acquisitions or divestitures, that would increase the Company’s tax rate; violation of the Company’s debt covenants if price and/or volumes return to previous levels of instability; cybersecurity risks; downward pressure on the Company’s common stock price and its impact on goodwill impairment evaluations; the possibility of a reduction of the Company’s credit rating to non-investment grade; and other risk factors listed from time to time found in the Company’s filings with the SEC.

項目 9.01.財務諸表および別紙。

(d) Exhibits

1934年証券取引法の要件に従い、登録者は本報告書に正式に権限を付与された署名者により、登録者を代表して署名させた。