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MD
Prophiotics Skincare develops microbiome-focused skincare that uses bacteriophages to target acne-causing bacteria while preserving beneficial skin bacteria. Its two-step solution pairs exfoliation with acne-specific phages, reflecting the Rockville company’s broader work with probiotics and phage-based therapeutics.
Protec Glass LLC is a glazing contractor serving DC, MD, VA, West Virginia, and PA. The company offers fabrication and installation of exterior and interior glass systems, including glass entrances, shower doors, specialty glass, aluminum storefront and curtainwall framing, aluminum doors, composite metal panels, sunshades, and louvers.
Founded in 1993 by former Navy engineers Ron Minor and Brian Edwards, La Plata-based protoCAD turns product ideas into engineered designs, 3D-printed parts, and urethane castings. The co-owners’ early experience using 3D printing to design an ejection-seat rocket motor nozzle still informs the company’s work with inventors, manufacturers, and government customers nationwide. protoCAD is a small-business, ITAR-registered operation whose all-U.S.-citizen engineering team also supports complex government prototyping and fabrication projects.
Founded in 1994 as a scrap-metal trading business, ProTrade Steel has grown into a fully integrated company that brokers, processes, transports and exports ferrous and nonferrous scrap. Its Eastern U.S. operation combines four trading offices, two RJ Recycling facilities and a transportation division with more than 300 private railcars, connecting suppliers with domestic mills, foundries and buyers around the world. In 2025, ProTrade transferred full ownership to its employees through an ESOP, adding a shared-ownership model to a business led by a second generation of the Kessick family.
PRS Guitars is a Maryland guitar maker founded by Paul Reed Smith, who began building instruments in 1976 and opened the company for business in 1985. Its Stevensville factory produces guitars and amplifiers, while the company also operates a dedicated facility in Surabaya, Indonesia for SE Series instruments. PRS describes a heritage of continual instrument development and offers both production models and individually customized Private Stock instruments.
PTFE COMPOUNDS, INC. has specialized in developing and producing PTFE fluoropolymer compounds since its founding in 1992. The Elkton, Maryland manufacturer offers more than 1,000 formulations and can develop custom compounds or parts to specification. Its quality system is certified to ISO 9001:2015, and its high-capacity facility supports homogeneous batches up to 1,250 pounds.
Founded as a small creative business in 2007, PuffSticker.com makes custom puffy stickers with soft, raised designs that customers can see and feel. The company says it pioneered the format before puffy stickers became widely trendy, and now manufactures tactile labels and related branded print goods for businesses, creators, and personal projects. Its products are made to order and shipped to customers in the United States, Canada, Australia, and more than 30 other countries.
Puyallup Chocolates makes premium chocolates, including handcrafted bars and chocolate-covered treats. The company says its name and purpose are inspired by the Puyallup Tribe of Indians and its legacy of abundance and community, and describes its chocolates as crafted for sharing and enjoyment.
Since 1995, PwrQ has grown from a Hanover, Maryland headquarters into a 220,000-square-foot manufacturing operation serving critical infrastructure across North America. The company combines in-house engineering with vertically integrated production to build power distribution systems for data centers, renewable energy projects, and commercial and industrial facilities. PwrQ is now part of Forgent.
Q Systems Engineering develops embedded electronic controls and systems, including its HomeSaver remote property monitor and freeze alarm for homes and other remote sites. The Maryland company also takes on custom hardware and real-time firmware development, and played a major design role in a communications interface and supervisory board for the U.S. Naval Academy’s MidStar satellite, now in orbit and operational. Its work spans security and automation applications as well as contract engineering and consulting services.
College Park-based QC82 is developing room-temperature photonic quantum computers for large-scale simulations in chemistry and materials science. Its approach combines proprietary photon-detection technology with low-loss, mass-manufacturable photonic chip designs, aiming to move quantum computing from laboratory systems toward practical industrial infrastructure. The company’s work is supported by a growing portfolio of more than 14 patents and collaboration with University of Virginia co-founders.
As a Morgan State University spin-out founded by Dr. Birol Ozturk, QDSENSE develops compact NV-diamond quantum sensors for portable magnetic-field measurement and brain imaging. Its CQS devices are battery-operated prototypes for field use, while the DMEG platform uses room-temperature diamond sensing to pursue practical, scalable detection of brain signals without cryogenic cooling. The company combines optically detected magnetic resonance with machine-learning inference to extract vector field information from compact devices.
QIAGEN is a global life-science company known for helping laboratories turn biological samples into usable molecular insights. Its tools support research and clinical testing, while its certified service team helps laboratories maintain instruments and integrate workflows.
Founded in Gaithersburg in 1982, Quality Engraving & Design Inc. has spent more than four decades building its reputation on precision work, direct communication, and accountability. The company serves federal agencies, universities, and commercial clients, with work ranging from facility identification to custom recognition pieces. Its fire alarm annunciator panels are installed nationwide, while its broader service is rooted in making durable products that serve their purpose clearly.
Founded in 2008 by husband-and-wife pharmacists Terri and Roderick Peters, Quality of Life Pharmacy & Health is a veteran-owned community pharmacy specializing in personalized compounded medications. The Capitol Heights pharmacy pairs custom formulation with pharmacist-led disease management and medication coaching, drawing on the Peters’ experience across hospital, ambulatory-care, community and executive pharmacy settings. Its compounding work is tailored for patients whose needs are not met by commercially available medicines, including children and pets.
Quality Printers has been turning a garage operation into a full-service print and design shop since 1982, helping businesses communicate through printed materials, signage, and branding. Founded by Joe Namyst, the family operation moved from his garage to a 6,000-square-foot Waldorf warehouse before settling in White Plains, where it remains known for hands-on client service and specialized blueprint work. Its team also develops websites and offers promotional products, giving local businesses one place to shape and produce their messages.
Founded in 2021 by aerospace engineer Justin Lee, Quantum Senses grew from his attempt to help a Vietnam veteran hear television at home without disturbing his wife. The company now develops Earcoustic as an affordable hearing aid complement for people with mild to moderate hearing loss, with its recyclable, non-electronic design reflecting Lee’s interest in accessible and sustainable technology. University of Maryland Hearing Technology Lab testing has supported the product’s development.
Built by a team of established space-industry figures—including former NASA Administrator Jim Bridenstine and co-founder Kam Ghaffarian—Quantum Space Corporation is headquartered in Rockville, Maryland, with a growing U.S. manufacturing footprint. The company develops spacecraft for national security, civil, and commercial operators, with Ranger intended to support sustained orbital operations and satellite servicing.
Founded in 2017 by three partners with a lifelong passion for robotics and software engineering, Frederick-based Quasi Robotics builds autonomous mobile robots for moving supplies and materials through facilities. Its signature Model C2 carts use proprietary Q.AI software to navigate existing layouts without facility modifications, while the company is developing the mobile pick-and-place Model R2 to link handling and delivery into one workflow. Quasi also supports deployments with integration, training, and fleet-management services.
From its Rockville shop, R. S. Rubber Stamp makes personalized rubber stamps and engraved items, with laser cutting and prototyping services as part of the business. This small local company has been in business for over 20 years, and President Michele has been around stamps all her life. Customers can design stamps online or work directly with the staff when a custom order calls for a person’s help.