Business Overview: Mayville Engineering Company, Inc. (NYSE: MEC)

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Executive Summary

Mayville Engineering Company is a Wisconsin-based, vertically integrated contract manufacturer that designs, prototypes, and fabricates highly engineered metal components for a deliberately diversified set of OEM customers — commercial vehicles, construction and access equipment, powersports, data centers, agriculture, and military. Founded in 1945 and recognized by The Fabricator magazine as the largest U.S. fabricator for fifteen consecutive years, MEC's strategy is to be the few-and-far-between supplier capable of handling a product's entire lifecycle — from prototyping through tooling, fabrication, coating, assembly, and aftermarket support — rather than competing purely on piece-part price in a famously fragmented industry.

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1. Core Business Model & How They Work

 [ OEM Customer Needs Component Redesign (3-5 Year Cycles) ]
                     |
                     v
 [ MEC: Design --> Prototyping --> Tooling --> Fabrication -->
   Aluminum Extrusion --> Coating --> Assembly --> Aftermarket ]
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                     v
 [ 27 U.S. Facilities (25 operating), 9 states, ~3.5M sq ft, ~2,400 employees ]
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                     v
 [ Long-Term Customer Arrangements, Commodity Pass-Through Contracts ]

MEC positions itself as a full-lifecycle manufacturing partner rather than a single-process shop: it can take a customer from initial design and prototyping all the way through tooling, fabrication, aluminum extrusion, coating, assembly, and aftermarket component supply. Its work is typically tied to OEM customers' multi-year product redevelopment cycles (every three to five years), which creates recurring, program-length revenue visibility once MEC wins a given component or assembly.

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2. End Markets and Customer Concentration

            [ Mayville Engineering Company ]
                          |
   ---------------------------------------------------------
   |            |            |            |         |      |
Heavy/Medium  Construction  Powersports  Data Center  Agri-  Military
Commercial    & Access                   & Critical   culture
Vehicle       Equipment                  Power
   (no single market exceeds 32% of net sales)

PACCAR Inc. was MEC's largest customer at 13.6% of 2025 net sales; John Deere was about 10.0% (over $54 million). The top ten customers represented 62.3% of net sales, and the top 20 customers accounted for $421 million. The 2024 Accu-Fab acquisition expanded MEC's exposure to the data center & critical power end market, which the company has identified as a priority area for further capital investment.

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3. Competitive Landscape

MEC's filing names no specific competitors, instead describing the contract-manufacturing/fabrication industry as "highly fragmented," populated by many small, local players and only a limited number of companies able to offer the full product-lifecycle capability MEC provides.

       Fragmented Local Fabricators         Full-Lifecycle Partners
              |                                      |
   Many small, regional shops            Mayville Engineering (MEC):
   (single-process, limited scale)        design through aftermarket,
              |                            27 facilities, 9 states
   Price-competitive, commodity                      |
   piece-part work                        Few comparable full-service
                                           national competitors

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4. Strategic Strengths & Risks

Strengths: MEC's vertical integration — spanning design, tooling, fabrication, extrusion, coating, and assembly under one roof — lets it offer OEMs a single point of accountability across a product's lifecycle, a genuine differentiator in a fragmented market of narrower single-process competitors. End-market diversification (no single market over 32% of sales) is an explicit strategy to stabilize revenue across economic cycles. Commodity pass-through contracts "limit" tariff and raw-material exposure to margins, per the company's own characterization. The Fabricator magazine's 15-consecutive-year recognition as the largest U.S. fabricator (2011-2025) is a credible, independently sourced marker of scale leadership. Over 900 direct material suppliers, with more than 90% of raw materials sourced domestically, reduces geopolitical/tariff exposure relative to import-dependent competitors.

Risks: The business remains exposed to macroeconomic pressure — inflation, elevated interest rates, labor availability, and tariff-driven cost increases — and customers generally do not commit to firm long-term production schedules, complicating MEC's own capacity planning. Reliance on a few large customers (PACCAR and John Deere alone are roughly a quarter of net sales, and the top ten are 62.3%) is a meaningful concentration risk, and customers can terminate awarded business with limited notice despite the multi-year redevelopment-cycle dynamic. The growing data center & critical power exposure (via Accu-Fab) introduces concentration risk in a newer, less-tested end market for MEC.

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5. Financial Overview

Note: FY2025 total revenue, net income, and balance sheet figures were not directly disclosed in the Item 1/1A business-description portion of the 10-K reviewed (the ~$540M revenue figure above is inferred from the John Deere percentage, not a reported total).

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6. Summary Conclusion

Mayville Engineering's moat comes from vertical integration and scale in an otherwise highly fragmented, commoditized industry: few competitors can match its full design-to-aftermarket capability across nine states, and its 15-year run as the largest U.S. fabricator is a hard-earned, independently verified credential. That said, the business remains a contract manufacturer at heart — dependent on a concentrated set of large OEM customers who do not guarantee volumes and can reallocate business, meaning MEC's durability rests more on operational breadth and end-market diversification than on pricing power or customer lock-in.