Basis of presentation (Policies)	6 Months Ended
Jun. 30, 2026
Basis of presentation
Basis of presentation	Basis of presentation The interim unaudited Condensed Consolidated Financial Statements of Mayville Engineering Company, Inc. and subsidiaries (MEC, the Company, we, our, us or similar terms) presented here have been prepared in accordance with the accounting principles generally accepted in the United States of America (GAAP) and with instructions to Form 10-Q and Article 10 of Regulation S-X. They reflect all adjustments which are, in the opinion of management, necessary for a fair presentation of the results of operations and financial position for the interim unaudited periods presented. All intercompany balances and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. These interim unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Company’s consolidated financial statements and notes thereto for the year ended December 31, 2025, included in the Company’s Annual Report on Form 10-K. A summary of the Company’s significant accounting policies is included in the Company’s 2025 financial statements in the Annual Report on Form 10-K. The Company followed these policies in preparation of the interim unaudited Condensed Consolidated Financial Statements except for new accounting pronouncements adopted as described below.
Nature of Operations	Nature of Operations Mayville Engineering Company, Inc. (MEC) is a leading U.S.-based, vertically-integrated, value-added manufacturing partner providing a full suite of manufacturing solutions from concept to production, including design, prototyping and tooling, fabrication, aluminum extrusion, coating, assembly and aftermarket components. Our customers operate in diverse end markets, including heavy- and medium-duty commercial vehicles, datacenter & critical power, construction & access equipment, powersports, agriculture, military and other end markets. Founded in 1945 and headquartered in Milwaukee, Wisconsin, we are a leading Tier I U.S. supplier of highly engineered components to original equipment manufacturer (OEM) customers with leading positions in their respective markets. The Company maintains 27 facilities, of which 22 are in operation, located in Arkansas, Illinois, Michigan, Mississippi, North Carolina, Ohio, Pennsylvania, Virginia, and Wisconsin. Our engineering expertise and technical know-how allow us to add value through every product redevelopment cycle. Our one operating segment focuses on producing metal components that are used in a broad range of heavy- and medium-duty commercial vehicles, datacenter & critical power, construction & access equipment, powersports, agricultural, military and other products.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In September 2025, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) 2025-06, Intangibles – Goodwill and Other-Internal-Use Software, amending Accounting Standards Codification (ASC) 350. The amendment removes all references to prescriptive and sequential software development stages. In addition, the amendment also requires consideration of whether there is significant uncertainty associated with the development activities of the software during evaluation of a probable-to-complete recognition threshold. ASU 2025-06 is effective for interim and annual periods beginning after December 15, 2027. Entities may adopt the guidance using either a prospective approach (including a modified transition approach) or retrospective approach. Early adoption is permitted. The Company has early adopted ASU 2025-06 on a prospective basis, as of January 1, 2026. The adoption of ASU 2025-06 did not have a material impact on the Company’s consolidated financial statements. In December 2025, the FASB issued ASU 2025-12, Codification Improvements. The ASU addresses 33 items, representing the changes to the Codification that (1) clarify, (2) correct errors, or (3) make minor improvements. Generally, the amendments in this update are not intended to result in significant changes for most entities. The ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2026. Early adoption is permitted. The Company adopted this standard as of January 1, 2026, and the amendments have been applied on a prospective basis. Adoption of ASU 2025-12 did not have a material impact on the Company’s consolidated financial statements. Recently Issued Accounting Standards Not Yet Adopted In November 2024, the FASB issued ASU 2024-03, Expense Disaggregation Disclosures, amending ASC 220, Income Statement – Reporting Comprehensive Income. The amendment requires an entity to provide a disclosure within the financial statement footnotes showing the disaggregation of certain expenses included in relevant expense captions on the consolidated income statement, with a qualitative description of the amounts that are not separately disaggregated quantitatively. The guidance also requires disclosure of the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027. The guidance is applied on a prospective basis, with a retrospective option and allows for early adoption. The Company is evaluating the potential impact of this guidance on the consolidated financial statements. In December 2025, the FASB issued ASU 2025-11, Interim Reporting - Narrow-Scope Improvements, amending ASC 270. The ASU clarifies interim disclosure requirements and the applicability of ASC 270. The objective of the amendments is to provide further clarity about the current interim disclosure requirements. The ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Adoption of this ASU can be applied either on a prospective or a retrospective approach. Early adoption is permitted. The Company is evaluating the potential impact of this guidance on the condensed consolidated financial statements.

Basis of presentation (Policies)

6 Months Ended

Jun. 30, 2026

The interim unaudited Condensed Consolidated Financial Statements of Mayville Engineering Company, Inc. and subsidiaries (MEC, the Company, we, our, us or similar terms) presented here have been prepared in accordance with the accounting principles generally accepted in the United States of America (GAAP) and with instructions to Form 10-Q and Article 10 of Regulation S-X. They reflect all adjustments which are, in the opinion of management, necessary for a fair presentation of the results of operations and financial position for the interim unaudited periods presented. All intercompany balances and transactions have been eliminated in consolidation.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. These interim unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Company’s consolidated financial statements and notes thereto for the year ended December 31, 2025, included in the Company’s Annual Report on Form 10-K. A summary of the Company’s significant accounting policies is included in the Company’s 2025 financial statements in the Annual Report on Form 10-K. The Company followed these policies in preparation of the interim unaudited Condensed Consolidated Financial Statements except for new accounting pronouncements adopted as described below.

Nature of Operations

Mayville Engineering Company, Inc. (MEC) is a leading U.S.-based, vertically-integrated, value-added manufacturing partner providing a full suite of manufacturing solutions from concept to production, including design, prototyping and tooling, fabrication, aluminum extrusion, coating, assembly and aftermarket components. Our customers operate in diverse end markets, including heavy- and medium-duty commercial vehicles, datacenter & critical power, construction & access equipment, powersports, agriculture, military and other end markets. Founded in 1945 and headquartered in Milwaukee, Wisconsin, we are a leading Tier I U.S. supplier of highly engineered components to original equipment manufacturer (OEM) customers with leading positions in their respective markets. The Company maintains 27 facilities, of which 22 are in operation, located in Arkansas, Illinois, Michigan, Mississippi, North Carolina, Ohio, Pennsylvania, Virginia, and Wisconsin. Our engineering expertise and technical know-how allow us to add value through every product redevelopment cycle.

Our one operating segment focuses on producing metal components that are used in a broad range of heavy- and medium-duty commercial vehicles, datacenter & critical power, construction & access equipment, powersports, agricultural, military and other products.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In September 2025, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) 2025-06, Intangibles – Goodwill and Other-Internal-Use Software, amending Accounting Standards Codification (ASC) 350. The amendment removes all references to prescriptive and sequential software development stages. In addition, the amendment also requires consideration of whether there is significant uncertainty associated with the development activities of the software during evaluation of a probable-to-complete recognition threshold. ASU 2025-06 is effective for interim and annual periods beginning after December 15, 2027. Entities may adopt the guidance using either a prospective approach (including a modified transition approach) or retrospective approach. Early adoption is permitted. The Company has early adopted ASU 2025-06 on a prospective basis, as of January 1, 2026. The adoption of ASU 2025-06 did not have a material impact on the Company’s consolidated financial statements.

In December 2025, the FASB issued ASU 2025-12, Codification Improvements. The ASU addresses 33 items, representing the changes to the Codification that (1) clarify, (2) correct errors, or (3) make minor improvements. Generally, the amendments in this update are not intended to result in significant changes for most entities. The ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2026. Early adoption is permitted. The Company adopted this standard as of January 1, 2026, and the amendments have been applied on a prospective basis. Adoption of ASU 2025-12 did not have a material impact on the Company’s consolidated financial statements.

Recently Issued Accounting Standards Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Expense Disaggregation Disclosures, amending ASC 220, Income Statement – Reporting Comprehensive Income. The amendment requires an entity to provide a disclosure within the financial statement footnotes showing the disaggregation of certain expenses included in relevant expense captions on the consolidated income statement, with a qualitative description of the amounts that are not separately disaggregated quantitatively. The guidance also requires disclosure of the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027. The guidance is applied on a prospective basis, with a retrospective option and allows for early adoption. The Company is evaluating the potential impact of this guidance on the consolidated financial statements.

In December 2025, the FASB issued ASU 2025-11, Interim Reporting - Narrow-Scope Improvements, amending ASC 270. The ASU clarifies interim disclosure requirements and the applicability of ASC 270. The objective of the amendments is to provide further clarity about the current interim disclosure requirements. The ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Adoption of this ASU can be applied either on a prospective or a retrospective approach. Early adoption is permitted. The Company is evaluating the potential impact of this guidance on the condensed consolidated financial statements.