# List of companies with in-house R&D in Maryland

Tamtam tracks 107 companies with in-house R&D headquartered in Maryland. This list ranks the 50 largest by number of employees on LinkedIn, led by Johns Hopkins Medicine, The National Institutes of Health and University of Maryland. Their median headcount is 2,013. Half of them were founded in 1971 or later. The most common headquarters are Baltimore (9), Rockville (8) and Bethesda (5).

These large companies in Maryland are characterized by a strong presence in research and development, particularly in the health and academic sectors. Johns Hopkins Medicine coordinates research, teaching, and patient care for its medical school and health system. The National Institutes of Health is a major public funder of biomedical research, while the University of Maryland is a public research university. Johns Hopkins Applied Physics Laboratory provides technical expertise for national security. McCormick & Company manufactures spices and seasonings, and Under Armour designs performance apparel.

A notable pattern among these organizations is the significant concentration of headquarters in Baltimore. This city hosts Johns Hopkins Medicine, The Johns Hopkins University, Under Armour, and the University of Maryland, Baltimore (UMB). Many of these entities, such as The National Institutes of Health, The Johns Hopkins University School of Medicine, and the National Institute of Standards and Technology (NIST), have long histories, with founding dates ranging from the late 19th to mid-20th centuries.

🇺🇸 Maryland · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Johns Hopkins Medicine](https://www.tamtam.ai/c/johns-hopkins-medicine) (hopkinsmedicine.org)<br>Coordinates research, teaching, patient care, and related enterprises for the university's School of Medicine and health system, including hospitals and healthcare practices. | Hospitals and Health Care | 🇺🇸 Baltimore | 39,325 |  |
| 2 | [The National Institutes of Health](https://www.tamtam.ai/c/the-national-institutes-of-health) (nih.gov)<br>Largest public funder of biomedical research investing billions annually to improve health, reduce illness, and support medical breakthroughs worldwide. | Biotechnology Research | 🇺🇸 Bethesda | 28,537 | 1887 |
| 3 | [University of Maryland](https://www.tamtam.ai/c/university-of-maryland) (umd.edu)<br>Public research university emphasizing hands-on learning, interdisciplinary collaboration, innovation, entrepreneurship, and global citizenship through diverse academic and research opportunities. | Higher Education | 🇺🇸 College Park | 21,670 |  |
| 4 | [The Johns Hopkins University](https://www.tamtam.ai/c/the-johns-hopkins-university) (jhu.edu)<br>Leading research university offering diverse academic programs across multiple campuses, fostering innovation and improving lives through education and discovery. | Higher Education | 🇺🇸 Baltimore | 18,221 |  |
| 5 | [McCormick & Company](https://www.tamtam.ai/c/mccormick-and-company) (mccormickcorporation.com)<br>A global leader in flavor, McCormick manufactures and distributes spices, seasonings, and other flavorful products to the food industry worldwide | Food and Beverage Manufacturing | 🇺🇸 Hunt Valley | 14,000 | 1889 |
| 6 | [Under Armour](https://www.tamtam.ai/c/under-armour) (underarmour.com)<br>Design and develop innovative performance apparel, footwear, and gear focused on enhancing athletes' training, competition, and recovery experiences. | Retail Apparel and Fashion | 🇺🇸 Baltimore | 13,004 | 1996 |
| 7 | [Ciena](https://www.tamtam.ai/c/ciena) (ciena.com)<br>Global leader in optical and routing systems, services, and automation software, building adaptive networks to meet digital demands with innovation and collaboration | Telecommunications | 🇺🇸 Hanover | 10,652 | 1992 |
| 8 | [Johns Hopkins Applied Physics Laboratory](https://www.tamtam.ai/c/johns-hopkins-applied-physics-laboratory) (jhuapl.edu)<br>University-affiliated research center providing technical expertise, prototyping, research, development, and analysis for national security and scientific challenges. | Defense and Space Manufacturing | 🇺🇸 Laurel | 7,850 | 1942 |
| 9 | [The Johns Hopkins University School of Medicine](https://www.tamtam.ai/c/the-johns-hopkins-university-school-of-medicine) (hopkinsmedicine.org)<br>Provider of top-ranked medical and graduate programs, clinical fellowships, residencies, basic science research opportunities, and medical art programs with renowned experts | Hospitals and Health Care | 🇺🇸 Baltimore | 7,057 | 1889 |
| 10 | [ESAB Corporation](https://www.tamtam.ai/c/esab-corporation) (esabcorporation.com)<br>A global leader in innovative solutions for fabrication and specialty gas control markets, focusing on continuous improvement and empowering associates worldwide | Machinery Manufacturing | 🇺🇸 North Bethesda | 5,556 |  |
| 11 | [National Institute of Standards and Technology (NIST)](https://www.tamtam.ai/c/national-institute-of-standards-and-technology-nist) (nist.gov)<br>An innovative federal agency advancing measurement science, standards, and technology to promote US innovation and industrial competitiveness | Research Services | 🇺🇸 Gaithersburg | 4,946 | 1901 |
| 12 | [National Security Agency](https://www.tamtam.ai/c/national-security-agency) (nsa.gov)<br>Provides foreign signals intelligence to policymakers and military forces while securing national security systems and weaponry through advanced cybersecurity and computer operations. | Defense and Space Manufacturing | 🇺🇸 Ft. Meade | 4,637 | 1952 |
| 13 | [W. R. Grace](https://www.tamtam.ai/c/w-r-grace) (grace.com)<br>Supplies catalysts, engineered materials, process technologies, fine chemicals. Industries enhance modern life. Manufactures renewable fuels, pharmaceuticals, food packaging better, faster, smarter. | Chemical Manufacturing | 🇺🇸 Columbia | 4,244 |  |
| 14 | [NASA Goddard Space Flight Center](https://www.tamtam.ai/c/nasa-goddard-space-flight-center) (nasa.gov)<br>A major US laboratory developing and operating unmanned scientific spacecraft for NASA's Earth observation, astronomy, planetary science, and astrophysics missions | Defense and Space Manufacturing | 🇺🇸 Greenbelt | 4,049 | 1959 |
| 15 | [University of Maryland, Baltimore (UMB)](https://www.tamtam.ai/c/university-of-maryland-baltimore-umb) (umaryland.edu)<br>A leading public research university in Maryland offering professional schools in health, law, and human services since 1807 | Higher Education | 🇺🇸 Baltimore | 3,994 | 1807 |
| 16 | [ESAB](https://www.tamtam.ai/c/esab) (esab.com)<br>A global leader in welding technology, offering equipment, consumables, automation, and cutting systems to improve productivity and reduce costs for manufacturers worldwide | Machinery Manufacturing | 🇺🇸 North Bethesda | 3,785 | 1904 |
| 17 | [Precision Medicine Group](https://www.tamtam.ai/c/precision-medicine-group) (precisionmedicinegrp.com)<br>A company founded in 2012 focused on improving the drug development process through technology, data, human expertise, and strategic acquisitions | Pharmaceutical Manufacturing | 🇺🇸 Bethesda | 3,553 | 2012 |
| 18 | [Sheppard Pratt](https://www.tamtam.ai/c/sheppard-pratt) (sheppardpratt.org)<br>A leading nonprofit provider of mental health, substance use, special education, and social services through hospital- and community-based resources, prioritizing global mental health care quality | Mental Health Care | 🇺🇸 Baltimore | 3,354 |  |
| 19 | [Hughes](https://www.tamtam.ai/c/hughes) (hughes.com)<br>Provides broadband equipment, services, and network operations to millions of consumers, businesses, and governments worldwide via satellite and multi-transport technologies. | Telecommunications | 🇺🇸 Germantown | 3,209 | 1971 |
| 20 | [ZeniMax Media](https://www.tamtam.ai/c/zenimax-media) (zenimax.com)<br>This company creates and publishes original interactive entertainment content for consoles, PC, handheld/wireless devices, with award-winning video games and acclaimed development studios | Computer Games | 🇺🇸 Rockville | 2,992 | 1999 |
| 21 | [Kennedy Krieger Institute](https://www.tamtam.ai/c/kennedy-krieger-institute) (kennedykrieger.org)<br>A renowned institute in Baltimore, MD, specializing in improving the lives of children and adolescents with brain, spinal cord, and musculoskeletal disorders | Hospitals and Health Care | 🇺🇸 Baltimore | 2,841 | 1937 |
| 22 | [Tenable](https://www.tamtam.ai/c/tenable) (tenable.com)<br>Exposes and closes cybersecurity gaps, unifies security visibility, insight, and action across the attack surface for organizations globally. | Computer and Network Security | 🇺🇸 Columbia | 2,361 |  |
| 23 | [University of Maryland School of Medicine](https://www.tamtam.ai/c/university-of-maryland-school-of-medicine) (medschool.umaryland.edu)<br>Leading biomedical research institution with top-tier faculty and extensive global reach, dedicated to advancing innovative research in virology, genomics, and global health | Research Services | 🇺🇸 | 2,179 | 1807 |
| 24 | [Precision For Medicine](https://www.tamtam.ai/c/precision-for-medicine) (precisionformedicine.com)<br>A global precision medicine clinical research organization improving therapeutics development with integrated clinical operations, laboratory expertise, and advanced data sciences | Biotechnology Research | 🇺🇸 Bethesda | 2,060 |  |
| 25 | [Thales Defense & Security, Inc.](https://www.tamtam.ai/c/thales-defense-and-security-inc) (thalesdsi.com)<br>Global provider of innovative solutions for defense, federal, and commercial markets including communication systems, sonar systems, data protection, and technology integration for various domains | Defense and Space Manufacturing | 🇺🇸 Clarksburg | 2,013 | 1964 |
| 26 | [Naval Air Warfare Center Aircraft Division (NAWCAD)](https://www.tamtam.ai/c/naval-air-warfare-center-aircraft-division-nawcad) (navair.navy.mil)<br>Supporting research, development, testing, and sustainment of Navy and Marine Corps aircraft globally, with a workforce of military and civilians Headquarters in Maryland | Aviation and Aerospace Component Manufacturing | 🇺🇸 Patuxent River | 1,986 |  |
| 27 | [X-energy](https://www.tamtam.ai/c/x-energy) (x-energy.com)<br>development and manufacturing of innovative nuclear fuel and reactor designs for safe, affordable, and reliable carbon-free baseload power | Nuclear Electric Power Generation | 🇺🇸 Rockville | 1,858 | 2009 |
| 28 | [US Pharmacopeia](https://www.tamtam.ai/c/us-pharmacopeia) (usp.org)<br>An independent, nonprofit organization establishing quality standards for medicines and dietary supplements to protect patient safety and improve global health | Pharmaceutical Manufacturing | 🇺🇸 Rockville | 1,672 | 1820 |
| 29 | [AAI Corporation](https://www.tamtam.ai/c/aai-corporation) (textronsystems.com)<br>This company develops and integrates products and services for aerospace, defense, law enforcement, security, and critical infrastructure protection worldwide | Defense and Space Manufacturing | 🇺🇸 Hunt Valley | 1,655 | 1950 |
| 30 | [US Fertility](https://www.tamtam.ai/c/us-fertility) (usfertility.com)<br>Leader in reproductive medicine and IVF services, supporting physicians and couples in building families through innovative science and advanced technology | Hospitals and Health Care | 🇺🇸 Rockville | 1,604 |  |
| 31 | [University of Maryland Eastern Shore](https://www.tamtam.ai/c/university-of-maryland-eastern-shore) (umes.edu)<br>A historically black university offering accredited degree programs in various fields, research opportunities, and graduate-level programs focusing on teaching and stewardship | Higher Education | 🇺🇸 Princess Anne | 1,588 | 1886 |
| 32 | [Hughes Systique Corporation (HSC)](https://www.tamtam.ai/c/hughes-systique-corporation-hsc) (hsc.com)<br>A multinational provider of digital solutions and services, specializing in software development, with expertise in Networking, AI & ML, Retail, Automotive, IoT, Blockchain, and Security | Software Development | 🇺🇸 Rockville | 1,547 | 2005 |
| 33 | [United Therapeutics Corporation](https://www.tamtam.ai/c/united-therapeutics-corporation) (unither.com)<br>Biotechnology company developing unique products for patients with chronic conditions, with a focus on providing transplantable organs Employees collaborate worldwide | Pharmaceutical Manufacturing | 🇺🇸 Silver Spring | 1,515 | 1996 |
| 34 | [Emergent BioSolutions](https://www.tamtam.ai/c/emergent-biosolutions) (emergentbiosolutions.com)<br>This company develops, manufactures, and delivers protections against public health threats to defend people and ensure preparedness | Biotechnology Research | 🇺🇸 Gaithersburg | 1,366 | 1998 |
| 35 | [Medifast, Inc](https://www.tamtam.ai/c/medifast-inc) (medifastinc.com)<br>Science-based health company offering personalized lifestyle plans, products, and coaching to improve metabolic function and body composition. | Wellness and Fitness Services | 🇺🇸 Baltimore | 1,321 | 1981 |
| 36 | [IonQ](https://www.tamtam.ai/c/ionq) (ionq.com)<br>Creating powerful and scalable quantum computers using a unique trapped-ion approach to solve complex problems and transform industries globally | Computers and Electronics Manufacturing | 🇺🇸 College Park | 1,296 | 2015 |
| 37 | [Baltimore Aircoil Company](https://www.tamtam.ai/c/baltimore-aircoil-company) (baltimoreaircoil.com)<br>Design and manufacture advanced evaporative, hybrid, and dry cooling technologies for HVAC, industrial, and refrigeration industries worldwide. | Industrial Machinery Manufacturing | 🇺🇸 Jessup | 1,250 | 1938 |
| 38 | [STANLEY Engineered Fastening](https://www.tamtam.ai/c/stanley-engineered-fastening) (stanleyengineeredfastening.com)<br>provides advanced fastening and assembly products with global support, engineering expertise, and rapid onsite customer service worldwide | Industrial Machinery Manufacturing | 🇺🇸 Towson | 1,181 |  |
| 39 | [Cystic Fibrosis Foundation](https://www.tamtam.ai/c/cystic-fibrosis-foundation) (cff.org)<br>Nonprofit dedicated to finding a cure and improving lives for those with cystic fibrosis through research, care, and advocacy for better health experiences and outcomes. | Non-profit Organizations | 🇺🇸 Bethesda | 1,152 | 1955 |
| 40 | [Brivo](https://www.tamtam.ai/c/brivo) (brivo.com)<br>A global leader in cloud-based access control technology for commercial real estate, multifamily residential buildings, and large enterprises | IT Services and IT Consulting | 🇺🇸 Bethesda | 1,147 | 1999 |
| 41 | [U.S. Army DEVCOM Army Research Laboratory](https://www.tamtam.ai/c/u-s-army-devcom-army-research-laboratory) (arl.devcom.army.mil)<br>Official page Content shared does not imply endorsement Stay updated on company news and announcements here | Armed Forces | 🇺🇸 Adelphi | 1,134 | 1992 |
| 42 | [MESO SCALE DIAGNOSTICS, LLC.](https://www.tamtam.ai/c/meso-scale-diagnostics-llc) (mesoscale.com)<br>Develops, manufactures, and commercializes assays and instruments for measuring molecules in biological samples, supporting medical research and drug development with proprietary technology. | Biotechnology Research | 🇺🇸 Rockville | 1,035 | 1995 |
| 43 | [Johns Hopkins Whiting School of Engineering](https://www.tamtam.ai/c/johns-hopkins-whiting-school-of-engineering) (engineering.jhu.edu)<br>The company's faculty and students work on cutting-edge research in various fields including wind engineering, computational medicine, and surgical robotics | Higher Education | 🇺🇸 Baltimore | 992 |  |
| 44 | [Novavax](https://www.tamtam.ai/c/novavax) (novavax.com)<br>Creating accessible next generation vaccines to combat infectious diseases and viral threats, driven by passion for global health and guided by science and technology | Biotechnology Research | 🇺🇸 Gaithersburg | 972 | 1987 |
| 45 | [RC_ARINC](https://www.tamtam.ai/c/rc-arinc) (rtx.com)<br>Innovative engineering solutions provider for aerospace, aviation, government, security, and transportation industries, delivering reliable and cost-effective products worldwide | Aviation and Aerospace Component Manufacturing | 🇺🇸 Annapolis | 931 | 1929 |
| 46 | [MedImmune](https://www.tamtam.ai/c/medimmune) (parkedpage.astrazeneca.com)<br>Global biologics research and development arm focused on discovering, developing, and commercializing small molecule and biologic prescription medicines across various medical areas | Biotechnology Research | 🇺🇸 Gaithersburg | 888 | 1987 |
| 47 | [EA Engineering, Science, and Technology, Inc., PBC](https://www.tamtam.ai/c/ea-engineering-science-and-technology-inc-pbc) (eaest.com)<br>An employee-owned public benefit corporation providing environmental, compliance, natural resources, and infrastructure engineering and management solutions to public and private clients nationwide | Environmental Services | 🇺🇸 Hunt Valley | 880 | 1973 |
| 48 | [Tasly Pharmaceutica Group Co., Ltd.](https://www.tamtam.ai/c/tasly-pharmaceutica-group-co-ltd) (tasly.com)<br>Overseas headquarters of a China-based pharmaceutical company, publicly traded on the Shanghai exchange, focusing on healthcare products and services | Pharmaceutical Manufacturing | 🇺🇸 Rockville | 875 | 2006 |
| 49 | [Supernus Pharmaceuticals, Inc.](https://www.tamtam.ai/c/supernus-pharmaceuticals-inc) (supernus.com)<br>A pharmaceutical company specializing in developing and marketing products for central nervous system diseases, including treatments for ADHD, epilepsy, migraine, and Parkinson's disease | Pharmaceutical Manufacturing | 🇺🇸 Rockville | 844 | 2005 |
| 50 | [Tate](https://www.tamtam.ai/c/tate-columbia) (tateglobal.com)<br>The company specializes in access floor and underfloor service distribution solutions for high-performance, sustainable commercial and data center environments, optimizing energy efficiency and infrastructure flexibility | Construction | 🇺🇸 Columbia | 817 | 1963 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Maryland

- [The largest companies in Maryland](https://www.tamtam.ai/l/largest-companies-maryland) (1,688)
- [Multinational companies in Maryland](https://www.tamtam.ai/l/multinational-companies-maryland) (216)
- [IT Services and IT Consulting companies in Maryland](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-maryland) (189)
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- [Education providers in Maryland](https://www.tamtam.ai/l/education-companies-maryland) (151)
- [Hospitals and Health Care companies in Maryland](https://www.tamtam.ai/l/hospitals-and-health-care-companies-maryland) (114)
- [Consulting firms in Maryland](https://www.tamtam.ai/l/consulting-firms-maryland) (112)
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- [Retail chains in Maryland](https://www.tamtam.ai/l/retail-chains-maryland) (91)
- [Public sector organisations in Maryland](https://www.tamtam.ai/l/public-sector-organisations-maryland) (91)
- [Financial services firms in Maryland](https://www.tamtam.ai/l/financial-services-firms-maryland) (88)
- [Aerospace and defence companies in Maryland](https://www.tamtam.ai/l/aerospace-and-defense-companies-maryland) (80)
- [Construction companies in Maryland](https://www.tamtam.ai/l/construction-companies-maryland) (80)
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- [SaaS companies in Maryland](https://www.tamtam.ai/l/saas-companies-maryland) (52)
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## The same list elsewhere in United States

- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,276)
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- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (419)
- [Companies with in-house R&D in Massachusetts](https://www.tamtam.ai/l/r-and-d-companies-massachusetts) (396)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Companies with in-house R&D in Michigan](https://www.tamtam.ai/l/r-and-d-companies-michigan) (287)
- [Companies with in-house R&D in Ohio](https://www.tamtam.ai/l/r-and-d-companies-ohio) (277)
- [Companies with in-house R&D in Pennsylvania](https://www.tamtam.ai/l/r-and-d-companies-pennsylvania) (255)
- [Companies with in-house R&D in New Jersey](https://www.tamtam.ai/l/r-and-d-companies-new-jersey) (224)
- [Companies with in-house R&D in Florida](https://www.tamtam.ai/l/r-and-d-companies-florida) (221)
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- [Companies with in-house R&D in Georgia](https://www.tamtam.ai/l/r-and-d-companies-georgia) (173)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Companies with in-house R&D in North Carolina](https://www.tamtam.ai/l/r-and-d-companies-north-carolina) (158)
- [Companies with in-house R&D in Wisconsin](https://www.tamtam.ai/l/r-and-d-companies-wisconsin) (154)
- [Companies with in-house R&D in Minnesota](https://www.tamtam.ai/l/r-and-d-companies-minnesota) (146)
- [Companies with in-house R&D in Washington State](https://www.tamtam.ai/l/r-and-d-companies-washington-state) (140)
- [Companies with in-house R&D in Colorado](https://www.tamtam.ai/l/r-and-d-companies-colorado) (113)
- [Companies with in-house R&D in Indiana](https://www.tamtam.ai/l/r-and-d-companies-indiana) (104)
- [Companies with in-house R&D in New York](https://www.tamtam.ai/l/r-and-d-companies-new-york) (223)
- [Companies with in-house R&D in San Francisco](https://www.tamtam.ai/l/r-and-d-companies-san-francisco) (147)
- [Companies with in-house R&D in Houston](https://www.tamtam.ai/l/r-and-d-companies-houston) (129)
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Source: https://www.tamtam.ai/l/r-and-d-companies-maryland