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MD
From a small distillery in Saint Michaels’ historic Old Mill, Windon Distilling makes LYON RUM by hand in ultra-small batches, turning Louisiana raw sugar and molasses into cane-to-glass American rum. The distillery has been making spirits on Maryland’s Eastern Shore for 13 years, using traditional pot stills and hand-infusing its rum liqueurs with whole fruits and botanicals, without coloring, flavoring or additives. Its Rum Van delivers bottles throughout Maryland, while the Golden Hour rum room offers a tasting-focused setting at the distillery.
3M is a science and materials company that develops and sells products and technologies for industrial, consumer, transportation, electronics, and other markets. Its site describes more than 100 years of expertise and a broad portfolio of solutions used in manufacturing, including automotive assembly and metal fabrication.
Founded in 1985 by Albertina and Manuel Luis, M Luis Construction is a multigenerational, woman- and minority-owned company that manufactures asphalt and builds and rebuilds roads across the Baltimore-Washington region. Its two asphalt plants and construction operation have produced millions of tons of material and paved thousands of lane miles, while its Maryland State Highway Administration-certified lab supports quality testing. The company also has deep community roots, with employees volunteering and supporting organizations including Children’s National Hospital and the American Red Cross.
Founded in 2003 by the combination of Stonemark Flooring and M&R Floors, M R Stone is a 20,000-square-foot stone and quartz manufacturer serving the Mid-Atlantic. It fabricates and installs stone for residential and commercial builders, remodelers, and design consultants, with more than one million square feet of stone fabrication completed. The company says all fabrication is performed in-house and that it recycles manufacturing water and stone waste.
For five generations, M. Davis & Sons has built its reputation as a Mid-Atlantic industrial contractor with more than 150 years of experience and a workforce of over 400 tradespeople. The company is known for taking on complex facility projects, particularly for regulated manufacturers, with engineering and fabrication handled through its own 90,000-square-foot shop network. Its controlled non-ferrous facility gives pharmaceutical and food-and-beverage customers a specialized setting for precision work.
With 95 years of precision behind it, M.S. Willett Inc. is a Littlestown, Pennsylvania manufacturer known for the craftsmanship that supports metal packaging production across North America. Now part of The Leonhardt Group, a family-owned industrial enterprise, Willett builds the specialized tooling and systems that help keep those lines running.
Family-owned and operated since 1980, M.T.H. Electric Trains—also known as Mike’s Train House—makes meticulously detailed model trains, parts, accessories, and layout-control systems for hobbyists. Its standout technology includes ProtoSound and the DCS command system, while a separate Michigan research and development facility and training for technicians at more than 150 authorized service centers support the company’s focus on realistic operation and long-term service.
M&M Carnot designs, manufactures, builds, and services industrial and commercial refrigeration systems and controls. Founded in 1969, the company says it has commissioned thousands of refrigeration solutions worldwide and has specialized in natural-refrigerant refrigeration, including ammonia and CO2 systems. M&M Carnot is now a product line of Johnson Controls.
Founded in Baltimore in 1976, Mac Machine Company manufactures precision components and assemblies, originally for aerospace customers and now also for commercial aircraft, defense, and medical sectors. It operates a 35,000-square-foot Baltimore facility with 60 employees and describes more than 150 years of combined manufacturing experience. The company is known for precision machining and integrated production services, including work on complex aerospace housings.
MAC Metal Fabrication is a Maryland-based shop known for serving telecommunications contractors and tower installers across the Northeast. Its experienced fabricators provide custom structural work and turnkey support for projects ranging from tower extensions to equipment platforms, with welding performed to AWS D1.1 requirements.
Founded by CEO Guru Ramu in 2018, Mach33 Engineering turns aerospace ideas into engineered prototypes, fabricated components, and instruments for space missions. The Beltsville firm has supported NASA Goddard projects including the Mars Organic Molecule Analyzer and Dragonfly Mass Spectrometer, while also applying its design and manufacturing work to practical needs such as low-cost breathing devices during the COVID-19 pandemic.
MacPack LLC specializes in hazardous-materials packing and custom crating, with a mobile team that can bring its packing operation to facilities across the country or overseas. Based in Baltimore, the company’s management has more than 40 years of combined packing and transportation experience, and its trained employees are TSA-approved and certified to handle dangerous goods. MacPack is also a Certified Screening Facility and an accredited provider of export wood packaging compliant with ISPM 15.
Since 2013, Macro Dental Lab has been shaped by master technician Richard J. Shin, who brings more than 35 years in dental laboratory work to a locally operated Jessup, Maryland shop. The lab serves dentists throughout the DMV, completing every case in-house rather than outsourcing the work, with a particular reputation for its titanium partial dentures.
Founded in Annapolis, Made+ designs and produces American-made performance footwear, apparel, and accessories for movement from the Chesapeake Bay to everyday life. The vertically integrated brand grew from a vision to reimagine footwear manufacturing, keeping design, development, and production close at hand while using recycled materials and responsible sourcing. Its Annapolis retail store also serves as a hub for customization, sustainability, and community.
Since 1993, women-owned and operated Madison Avenue Inc. has produced custom signage and visual branding for meetings and events from its headquarters in Columbia, Maryland. Its made-in-USA work includes the reusable EDGE SMARTsign®, an in-house-developed-style solution that lets organizers replace event messages instead of discarding entire signs, alongside graphics and branded materials for corporate and nonprofit clients. The company’s production and operations remain in the United States, with design and project management handled in-house.
Known for operating at the tactical edge, MAG Aerospace is a U.S. Government prime contractor supporting defense missions around the world. The Fairfax-based company operates more than 200 manned and unmanned platforms and has built and operated 45 operations centers across six continents. Its aircraft work includes an FAA Part 145 Repair Station and more than 35 FAA Supplemental Type Certificates.
Magee Technologies, LLC (MTech) designs, analyzes, certifies, and manufactures aerospace structures for commercial and Department of Defense customers. Its engineers bring more than 135 years of combined experience across over 50 aerospace platforms, while its Maryland operations now include nearly 23,000 square feet of manufacturing space for rapid prototyping and aircraft work. MTech’s aerospace quality system is certified to ISO 9001:2015/AS9100.
Magma Build Studios is a custom fabricator of architectural finishes, furniture, lighting, and art. Its stated offerings include architectural and interior work, furnishings and decor, decorative lighting, glass faucets, and art fabrication.
Since 1987, Magnum Products has manufactured drywall joint compounds and related finishing materials for professional drywall applicators. With plants throughout the United States, the company formulates products for local climate and job conditions while retaining samples and testing every production batch in its laboratories. Magnum is also the maker of Level Coat, a spray-on system developed to achieve a Level 5 drywall finish and reduce joint shadowing under strong lighting.
Founded in 2016, Maiden Biosciences is a U.S.-based small biotechnology company that distributes prescription-only collagen topical dressings for wound and post-surgical care. Its dressings use structurally intact collagen, formulated to absorb wound exudate while maintaining a moist environment, with both sheet and powder formats available for different applications. The company is located in an economically diverse HUB zone and offers products with a stated 10-year shelf life.