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MD
Redox Power Systems is a Maryland energy technology company known for developing lower-temperature solid oxide fuel-cell systems for on-site power generation. Its work centers on the Redox Cube, a modular stationary unit intended for customers seeking distributed electricity, with combined heat and power as an option.
Founded in Brooklyn in 1912, Reeb is a building-products company that distributes door and millwork products and also produces door products. It serves building-material suppliers and professional contractors through five East Coast locations, stocking about 24,000 product SKUs in more than 1.2 million square feet of warehouse space. Reeb also operates two high-speed door pre-finishing lines and uses CNC machining and hand assembly for customized orders.
Founded in Logan in 1968 by machinist Reed Bindrup, Reed’s Precision Machine is a family-owned manufacturing shop built around dependable, customer-specific work. The company has grown from a one-mill operation into a 30,000-square-foot facility with about 38 employees, producing tight-tolerance parts for industries such as aerospace. Its team serves customers’ projects exclusively, without proprietary products competing for attention.
ReGelTec, Inc. is a Baltimore-based clinical-stage medical device company developing HYDRAFIL®, a percutaneous hydrogel implant for chronic low back pain caused by degenerative disc disease. Founded by chemical engineers with polymer-science expertise alongside medical-device professionals with multiple successful startup exits, the company is pursuing a minimally invasive alternative to more invasive spinal interventions. HYDRAFIL has received CE Mark under the European Union Medical Device Regulation but remains investigational in the United States.
Founded in 2005 after its owners saw a need for better-value kitchen and bath cabinetry, Regent Cabinet Solutions provides custom cabinetry and related surfaces for multifamily developments nationwide. Based in North East, Maryland, the company manages the process from design and manufacturing through installation and punch-out, with more than 250,000 successful unit installations to its name. Its Regent LUX line brings a high-design option to large-scale residential projects, while its turnkey approach keeps complex installations under one partner.
Rehabtek develops and manufactures portable robotic rehabilitation technology, centered on Stretch&Move, an ankle-training system that combines intelligent stretching with active movement. Based on research into neurological and orthopedic impairments—including studies involving children with cerebral palsy—the Linthicum Heights company focuses on affordable devices that help restore joint motion, muscle strength, and motor control. Its development and manufacturing facility operates under FDA 21 CFR 820 requirements, while Stretch&Move has Intertek electrical and EMC safety certification.
From its global headquarters in Columbia, Maryland, Rekor Systems builds AI-powered roadway intelligence software, cameras, and data services that turn mobility information into actionable insight. Its technology supports transportation management, urban mobility, and public safety, including license-plate and vehicle recognition that can run on nearly any IP camera. Rekor also brings more than three decades of traffic-data collection expertise to its technology-driven platform.
Founded in 2011 by former Space Shuttle-support engineer Kush Patel, Laurel-based Relative Dynamics develops aerospace engineering services and technology for government and commercial missions. Its engineering team spans spacecraft operations and systems engineering, while its in-house research group is developing optical communications hardware such as the SCOUT terminal. The company’s work includes support for NASA and NOAA programs, including the International Space Station, Artemis/Gateway and Earth-observing missions.
Established in 1994, RelComm Technologies designs and manufactures RF and microwave coaxial relays and waveguide switches for communications and instrumentation applications. Its Salisbury, Maryland operation produces and ships these products from a 16,000-square-foot facility, supporting uses ranging from military and satellite systems to medical equipment and test instrumentation. RelComm’s application-specific designs operate from DC to 40 GHz and are made in the USA.
Reliable Automatic Sprinkler Co., Inc. manufactures fire protection equipment, including sprinklers and valves, at its flagship manufacturing facility in Liberty, South Carolina. Founded on January 23, 1920, the company has supported the fire protection industry for more than a century and also distributes complementary system components through its network of regional sales and distribution centers.
Reliant Fish Company is a Welsh family business whose roots reach back to Baltimore’s Fish Market in the late 1930s. Family-owned since James J. Welsh Sr. purchased it in the late 1940s, the company is now in its fourth generation and serves Mid-Atlantic food businesses from Jessup, Maryland. Its long-running delivery operation and custom processing connect that history with the needs of today’s customers.
Founded in Baltimore in 2002, minority woman-owned ReliaSource provides mission-critical IT services to government agencies, combining global field support with citizen-facing technology and modernization work. Its standing network of more than 600 on-demand technicians has deployed over 3.5 million devices worldwide, while its teams also build public-service kiosks and run cloud DevSecOps programs for DoD and intelligence applications. ReliaSource holds ISO 9001:2015 and ISO/IEC 20243:2018 certifications and is designated a Maryland MBE and Virginia SWAM business.
RemBac Environmental develops and deploys patented, in situ bioremediation technology for PCB-contaminated sediments and soils, combining naturally occurring PCB-degrading microorganisms with activated carbon. Baltimore-based co-founders Kevin R. Sowers and Upal Ghosh bring decades of anaerobic microbiology and environmental engineering experience to a method designed to degrade and sequester PCBs while avoiding the disruption of conventional dredging. The company’s work includes pilot treatments at Superfund and other contaminated sites, including documented reductions in PCB mass and bioavailable PCBs.
Rensa Filtration manufactures commercial and industrial air filters and custom filtration products, with manufacturing and value-added services across North America and Europe. Founded in 2017, the company describes its heritage as Swedish and reports 12 million filters manufactured annually and more than 1,000 employees across its operations.
Founded in June 2000 by Sean Wise, RePliForm, Inc. electroplates 3D-printed plastics and other nonconductive materials to create metal-plastic composite parts. The Baltimore company adapts copper and nickel plating to complex geometries, adding stiffness, durability and functional properties such as EMI shielding while preserving the design freedom of additive manufacturing. RePliForm holds ISO 9001 and AS9100D certification, obtained in 2021.
Established in Japan in 2003 by researchers from Kyoto University and the University of Tokyo, REPROCELL is a biotech company built around pioneering work with human embryonic and induced pluripotent stem cells. It became an early commercial supplier of iPSC-derived human cells and now supports scientists and therapy developers with stem-cell research and clinical development services.
Founded in Baltimore in 1932 as the Radio Electric Service Company, RESCO Electronics now manufactures custom cable and electro-mechanical assemblies for OEMs and provides barcode equipment solutions. The company operates facilities in Baltimore, Madison and Ciudad Acuña with nearly 300 employees, and its history includes supplying components for Westinghouse’s Apollo Camera Program. RESCO’s ISO 9001:2015-registered quality system supports its work across medical, industrial and defense applications.
For 35 years, Rescue Phone, Inc. has made crisis-negotiator telephone systems for law-enforcement agencies, including the compact QUAD module and cellular response console. Based in Jessup, Maryland, the company sells directly to agencies without distributors or sales representatives and says its equipment is used by more than 20,000 hostage negotiators, including all 56 FBI field offices. Rescue Phone’s products carry a five-year warranty, and more than 3,000 units have been sold worldwide.
Founded in 1998, Research and Engineering Development, LLC is a small defense-business contractor that connects human-systems engineering with irregular-warfare support, cybersecurity, and emerging autonomous technologies. Based in California, Maryland, RED brings former military operators and defense-acquisition specialists into work ranging from warfighter-focused system integration to its tube-launched MOSQUITO unmanned aircraft, designed for persistent tracking in GPS- and communications-denied environments. Its processes are identified as compliant with DoD 5000.2 and SECNAV 5000.2C requirements.
Founded in 2008, Resensys is a Beltsville company known for developing compact wireless technology to help protect aging infrastructure from malfunction. Its SenSpot™ system provides remote, real-time monitoring for structures such as bridges and buildings, and its research roots include support from the National Science Foundation.