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Family-owned since 1938, Marion Engineering & Technology is a Marion, Indiana, industrial machine shop with roots in the former Marion Engineering Products. Jim and Susan Stengel bought the business in 2000, and the company now serves industrial customers with machine design, rebuilding and repair, including custom hydraulic cylinders.
Markers, Inc. manufactured and distributed golf course supplies, athletic field equipment, and garden and yard products under the MarkSmart and Holes-N-Poles brands. Its offerings included golf course marking products, athletic field lining systems and supplies, sports equipment, flag poles, driveway markers, and related accessories, with products described as American-made and distributed worldwide.
Founded in 1994, Willoughby-based Marketing Communication Resource produces direct-mail and fundraising communications for nonprofits nationwide. Its in-house work pairs print and mailing services with nonprofit-focused consulting, creative support and data expertise, and the company says it has served thousands of organizations over more than 30 years. MCR also operates on an à la carte basis, allowing clients to use it as an extension of their team without a required contract.
Founded in 1968 by Arnie Esterer and Tim Hubbard, Markko Vineyard and Winery produces dry European-style wines from its estate vineyard in Conneaut, Ohio. It was among the first Ohio wineries to successfully grow European vinifera grapes near Lake Erie, building its reputation around the region’s cool climate and Conneaut Creek terroir. Today, the winery’s tasting room and outdoor deck continue the tradition begun by Esterer, remembered as a pioneer of Ohio vinifera winemaking.
Founded by James F. Cain in 1960, Marlboro Manufacturing makes industrial hinges for original equipment manufacturers, with standard inventory and custom designs supporting domestic and international customers. Still owned and operated by the Cain family, the Alliance, Ohio company shifted from storm-door hardware to industrial hinges in the mid-1970s and now serves applications ranging from manufacturing equipment to emergency vehicles.
Founded in 1952 by John and Lillian Tymkewicz, Marlin Manufacturing Corporation grew from John’s work as a machinist and NACA innovator into a Cleveland company serving research and industrial customers. It is best known for the thermocouple connector developed from Tymkewicz’s early idea, and continues that temperature-instrumentation work with an ISO 9001:2015-registered quality system and an ISO 17025:2017-accredited metrology lab.
Marlin Thermocouple Wire is a Westlake, Ohio manufacturer built around technically oriented temperature-sensing products and in-house production. It serves industrial end users and distributors, with particular experience supporting demanding metalworking applications and maintaining a NIST-traceable calibration laboratory for reliable test results.
Marlon Products, which recently marked 50 years in business, makes outdoor leisure equipment for time on the water, in the snow and on the road. Based in Agassiz, British Columbia, the company operates as a wholesaler supporting a dealer network while building products designed to endure the elements. Its lineup now also includes DK2 products following Marlon’s acquisition of the brand.
Marmon Fastener Company is a multi-brand manufacturer and supplier of fasteners and related components, operating within Marmon Holdings, a Berkshire Hathaway company. The company reports more than 115 years of stability, eight brands, and over 5,000 products, with offerings serving construction, industrial and OEM, metal roofing, and woodworking markets. Its manufacturing model combines company-owned facilities with long-standing contract manufacturing partnerships.
Founded in 2013 by Mike Fitzsimmons, Marne Plastics has grown from a 7,200-square-foot start-up into a Grove City, Ohio manufacturer known for responsive service and dependable delivery. The company makes custom molded plastic components for manufacturers, supporting projects from early design through production in its 58,000-square-foot climate-controlled facility. Its ISO 9001:2015 certification and recognition from NIFCO reflect the quality systems behind that reputation.
Maronda Homes is a private, family-owned and operated new-construction home builder founded in 1972 by William J. Wolf. It builds affordable homes in communities across 11 states, with a stated focus on quality and customer service. The company also describes its construction process and energy-efficiency standards as central parts of its homebuilding approach.
Mars, Incorporated is a family-owned global business that manufactures and sells products across pet care, snacking and food, alongside veterinary services. The company says it has been headquartered and operated in the United States for more than a century, and its portfolio includes brands such as M&M’S, SNICKERS, PEDIGREE and BEN’S ORIGINAL.
Founded in 1892 by German blacksmith Alexander G. Kloene to forge braces for Civil War veterans and children, Marshall Kloene now creates custom orthotics, pedorthics and prosthetics in Ohio. The practice still emphasizes hands-on fabrication at its own facility while pairing that tradition with current materials and technology, and it works with physicians, therapists and families across its Maumee and Bryan locations.
Martin Cab designs and manufactures cab enclosures, a business it says began in 1922. The company specializes in steel and fabric enclosures for operator safety and productivity, including applications ranging from hot manufacturing environments to cold freezer settings.
Since 1954, Martin Diesel has grown from a trucking-industry repair shop into a Yanmar diesel engine and power-solutions company serving multiple industries. The company develops OEM solutions, repowers existing equipment, and partners with OEMs on U.S. military applications, with support spanning engineering design, parts repair, and technical service. Its leadership brings more than 35 years of diesel-engine industry expertise.
Near Stroud in Gloucestershire, Martin Jennings makes public bronze sculpture, best known for portrait figures of writers, poets and other notable Britons. His work combines carefully modelled likenesses with carved text in stone or slate, and includes John Betjeman at St Pancras Station and the official coinage portrait of King Charles III. Jennings trained in calligraphy, lettercutting and stonecarving after studying English at Oxford, and is a Fellow of the Royal Society of Sculptors.
Martin Marietta Magnesia Specialties manufactures high-purity magnesium oxide, magnesium hydroxide, and dolomitic lime products. Its products serve environmental, industrial, chemical, agricultural, power-generation, water-treatment, glass, mining, pulp-and-paper, refractory, steelmaking, rubber, plastic, and other specialty applications.
Founded by John and Grace Martin in April 2016, Martin Materials Solutions is a minority, woman-owned Ohio manufacturer built by space-industry veterans to strengthen domestic production. The company is known for its SPACEGLASS work, developing radiation-stable materials for satellite customers and supporting missions from low Earth orbit onward. It is ISO 9001:2015 certified.
Martin Mechanical Design is a product-development company built around making ideas practical to manufacture. It helps clients move from concept through prototyping into scalable production, while its Jemison DevKit brings the same engineering focus to an experimental drone platform for robotics developers and researchers.
Since 1985, Martin Pallet has made custom wood pallets, crates, and packaging materials at its on-site mill, serving customers across the United States. Its in-house fleet supports short-notice delivery, while managed inventory helps manufacturers keep pallets available without filling their own warehouses. The Massillon company also uses the NWPCA Pallet Design System and operates a 9,000-cubic-foot heat-treatment chamber for ISPM-15-compliant overseas shipments.