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Established in 2000, Mason-Dixon Machining produces precision CNC-machined parts and tight-tolerance filters for microwave applications, including RF, cavity, and waveguide products operating to 50 GHz. Its founding team brought experience from the microwave and manufacturing industry dating to 1979, while staff with backgrounds in production assembly, testing, and shipping help guide work from prototype through production. Quality control and inspection continue from setup through shipping.
MassaTable, Granix’s dedicated brand, makes made-to-order porcelain and fine mosaic tables and table tops in its Maryland fabrication workshop. Each piece is designed on demand and crafted by skilled artisans, with semi- or fully customizable options and surfaces made from large-format porcelain slabs. The company’s porcelain tables are proudly made in the USA and combine sculptural, furniture-like designs with durable surfaces suited to everyday use.
Incorporated in 2001, Columbia’s privately owned MassTech Inc. develops and manufactures analytical instrumentation, best known as the only licensed manufacturer of AP MALDI ion sources. Its compact MT Explorer 30 brings laboratory-level, MSⁿ-capable ion-trap analysis into a field-deployable package, while the company’s AP MALDI technology is adapted for mass spectrometers from major manufacturers worldwide. MassTech also maintains in-house research and production capabilities for custom instruments.
Known for turning overlooked entrances into polished first impressions, Mat Concepts creates custom entry mats for commercial and institutional spaces. Its team measures, designs, and installs mats built to withstand heavy foot traffic while fitting each site’s dimensions and visual identity.
Matech manufactures machined parts, custom-made components, assemblies, and military weapons, munitions, and electronic-warfare subsystems. Its capabilities include CNC machining, welding, laser and waterjet cutting, wire EDM, assembly, fabrication, packaging, engineering, and quality verification. The company serves U.S. and foreign governments, government prime contractors, defense agencies, commercial manufacturers, telecommunications companies, agricultural companies, firearms manufacturers, pharmaceutical companies, and other customers.
Founded in Salisbury in 1988 with four employees and one CNC machine, MaTech makes machined and fabricated components and provides assembly services for defense and other industrial customers. Its 165,000-square-foot facility supports work ranging from complex assemblies to military weapons, munitions, and electronic-warfare subsystems. MaTech also develops its own BUIS backup iron sights and operates an ISO 9001:2015-certified, ATF-compliant facility.
Founded in 2020, Baltimore-based Materic turns laboratory materials technologies into commercial products, pairing scientists and engineers with in-house development and production capabilities. Its team works across electrospun nanofibers, custom formulations, and advanced 3D-printed parts, helping customers move from early concepts through pilot and commercial manufacturing. Materic says its portfolio includes more than a dozen technologies acquired from research labs across the country, with more than 60 years of collective team experience in commercialization.
Since 1995, family-owned-and-operated Mathews Brothers has been building custom boats in Denton for Chesapeake Bay cruising, from a compact sport boat shaped by an Eastern Shore crabbing skiff to its new 51-foot flagship. Customers are invited into the build, choosing the layout and details while the shop combines traditional methods with modern composite construction. The company also keeps boats in service through repairs, refits, storage and brokerage, including dock-to-dock winter storage at Mathews Landing on the Choptank River.
Rooted in a Rwandan coffee-farming family, Baltimore-based Matriarch Coffee roasts specialty coffee sourced from Gasharu Farms and serves it through retail, wholesale, office-coffee, and café channels. The company’s story centers on Marie Mukamurenzi, who has used Gasharu Farms with her husband for more than 30 years to support their family and community, while Matriarch roasts distinctive coffees such as its 72-hour anaerobically fermented Ireme. Matriarch directs 10% of its profits to community programs and initiatives that financially empower women coffee farmers.
Matrix Bottling Group is a U.S. contract beverage manufacturer operating three facilities in California, Nevada, and North Carolina. The company provides co-packing and private-label production, with capacity stated at up to 100 million bottles per month; its operations include beverage formulation support and bottling for brands ranging from funded startups to national retailers. The company reports more than 15 years of industry experience.
Matthew Harris Studio LLC designs, hand forges, fabricates, finishes, and installs custom architectural and sculptural metalwork. Its products include railings, gates, fencing, window grilles, sculptures, and other custom metalwork made from bronze, copper, stainless steel, steel, aluminum, and brass for residential, commercial, public, and architectural spaces.
For more than 50 years, Mattr Corp. has combined advanced materials technology with complex manufacturing to build engineered products and systems for infrastructure projects worldwide. Its portfolio spans connection and composite technologies, including Shawflex wire and cable, Flexpipe composite linepipe and Xerxes storage and stormwater solutions. Based in Vaughan, Ontario, Mattr operates through established brands serving markets from energy and transportation to communications and water management.
MaxiForce Bollards, part of Blue Ember Technologies, manufactures traffic-control bollards designed to close or manage vehicle access while preserving quick passage for authorized and emergency users. Its distinctive collapsible line uses a patented breakaway system that lets first responders push a bollard aside without significant damage, then return it to service by replacing the release insert. The company also supplies fixed, standard-removable and light-removable bollards, along with portable Star Barriers and replacement parts, with products and manufacturing processes aligned with applicable industry codes and standards.
From its Rockville, Maryland facility, Maxim Biomedical develops and manufactures diagnostic tests while helping healthcare companies and government agencies move assays from concept to commercial production. Founded more than 20 years ago, the family-led company produces millions of tests each month in an FDA-registered, ISO 13485:2016-certified operation with capacity exceeding 15 million devices monthly. Its own products include HIV surveillance assays and the ClearDetect COVID-19 Antigen Home Test, alongside contract development and manufacturing for partners worldwide.
Founded in 2007, Maxtena designs and manufactures advanced RF antennas and wireless systems, including beamforming solutions for terrestrial and satellite communications. The company’s patented Dynamic Aperture Technology (DAT™) and Helicore™ antenna technology underpin products used on land, in the air and at sea, while its engineering team supports both off-the-shelf orders and customized integrations. Maxtena is headquartered in the Washington, D.C., metropolitan area and operates additional offices in North America and Europe.
May Solutions LLC is a Rockville-based high-tech research and engineering company known for developing its “Camera 2.0” approach to distortion-free camera calibration. It applies that work to precision 3D measurement systems and related engineering projects for organizations that need accurate imaging, scanning, or system calibration.
Female-owned and operated, Maya Jewelry built its identity over 19 years around radical self-expression and a close connection to the piercing community. Founded in 2006, the company created hand-forged body jewelry for people who wanted to move beyond conventional beauty standards, and its work received Phase 2 verification from the Association of Professional Piercers. Maya Jewelry closed on December 31, 2025.
Mayflower Laundries is a family business founded by Mukul Mehta in 1985 and now led by his daughters as its second generation. From its Baltimore beginnings, the company has grown into a regional linen-service operation with a particular focus on healthcare customers. Its Baltimore and Belcamp facilities hold both Hygienically Clean certification from TRSA and HLAC accreditation.
Since James Mazzella started the company in Cleveland in 1954 by hand-braiding wire-rope slings, Mazzella Companies has grown into an independently owned organization with more than 1,000 employees at over 40 locations across North America. Its no-excuses, customer-first culture supports industrial customers with lifting equipment and related service, while its roots in practical rigging work still shape the company today.
Mazzella Companies began in Cleveland in 1954, when James Mazzella hand-braided wire-rope slings, and it remains independently owned more than 70 years later. Now employing more than 1,000 people at dozens of locations, the company serves industrial customers through engineered lifting solutions and related support, with a culture shaped by safety and long-standing customer relationships.