These New Hampshire companies with in-house R&D are primarily large employers, with a strong presence of higher education institutions and healthcare providers. Companies like the University System of New Hampshire and Dartmouth Hitchcock Medical Center and Clinics employ thousands, offering education and advanced medical care. Manufacturing also features prominently, with Allegro MicroSystems specializing in power and sensing solutions, and SIG SAUER, Inc. producing firearms.
A notable pattern among these companies is the concentration of headquarters in specific areas. Lebanon and Hanover host several significant organizations, including Dartmouth Hitchcock Medical Center and Clinics and Dartmouth College. Other companies like Timberland (footwear and apparel) and Sitecore (digital experience software) contribute to a diverse industrial landscape across the state.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
University System of NHusnh.edu
The University System of New Hampshire is a major provider of post-secondary education with multiple institutions impacting thousands of New Hampshire citizens |
9,717 | |||
| 2 |
Dartmouth Hitchcock Medical Center and Clinicsdartmouth-hitchcock.org
Integrated health system providing advanced medical care, cancer treatment, pediatric services, and extensive ambulatory clinics across New Hampshire and Vermont. |
7,814 | |||
| 3 |
University of New Hampshireunh.edu
Public research university offering undergraduate and graduate programs, engaging in teaching, research, creative expression, and community service. |
6,952 | |||
| 4 |
Dartmouth Collegehome.dartmouth.edu
Educates promising students, prepares for lifelong learning and responsible leadership, supported by dedicated faculty focused on teaching and knowledge creation. |
6,538 | |||
| 5 |
Timberlandtimberland.com
A global leader in footwear and apparel, encouraging employees to embrace adventure and sustainability, offering perks for outdoor activities and career growth opportunities |
3,927 | |||
| 6 |
Allegro MicroSystemsallegromicro.com
A global leader in power and sensing solutions for motion control and energy-efficient systems, driving breakthrough advancements in various industries |
2,882 | |||
| 7 | 2,691 | ||||
| 8 |
Albany International Corp.albint.com
Global producer of custom fabrics for paper and nonwovens, supplier of advanced composite aerospace parts including fan blades and cases. |
2,584 | |||
| 9 |
Altra Industrial Motionaltramotion.com
Designing, producing motion control and power transmission solutions for equipment speed, torque, positioning, and other functions, solving complex customer challenges worldwide. |
2,238 | |||
| 10 |
Sitecoresitecore.com
The company provides digital experience software SaaS solution for brands to create memorable customer interactions |
1,745 | |||
| 11 |
SIG SAUER, Inc.sigsauer.com
Manufacturer of firearms, electro-optics, ammunition, and suppressors providing elite tactical training and remote weapons stations for military, law enforcement, and civilian markets. |
1,624 | |||
| 12 |
Dartmouth Healthdartmouth-health.org
Leading academic health system in New Hampshire, serving northern New England with top-ranked hospital, comprehensive cancer center, children's hospital, clinics, and research initiatives |
1,481 | |||
| 13 |
Hypertherm Associateshyperthermassociates.com
A US manufacturer of industrial cutting products and software, delivering solutions that shape the future for businesses worldwide |
1,316 | |||
| 14 |
Velcro Companiesvelcro.com
Global organization providing innovative fastening solutions with over 60 years of experience, owning 400+ patents and global manufacturing locations |
1,117 | |||
| 15 |
Laborielaborie.com
A world-class medical company specializing in diagnostic equipment and supplies for Urology, Gastroenterology, Gynecology, Obstetrics, and Neonatology, making a positive impact globally |
1,068 | |||
| 16 |
Resoneticsresonetics.com
Develops and manufactures precision components for medical devices, partnering with R&D teams from prototype to production-scale manufacturing with global facilities. |
1,067 | |||
| 17 |
Nordson MEDICALnordsonmedical.com
Global expert in designing, developing, and manufacturing complex medical devices and component technologies, serving interventional, surgical, and specialized markets with innovative solutions |
1,014 | |||
| 18 |
Geisel School of Medicine at Dartmouthgeiselmed.dartmouth.edu
Medical school focused on innovative research, training healthcare professionals, and improving community health through education and scientific advancement. |
965 | |||
| 19 |
DEKA Research & Developmentlinktr.ee
A leading R&D company focusing on innovative products, embracing creativity and technology to improve lives, seeking passionate individuals to join their team |
850 | |||
| 20 |
Amphenol TCSamphenol-tcs.com
Designs and manufactures industry-leading high-speed, high-density connectors and backplane systems for networking, communications, storage, and computer markets. |
843 | |||
| 21 |
Lindt & Spr眉ngli USAjobs.lindtusa.com
Fastest growing premium chocolate manufacturer operating a large production facility, research labs, and climate-controlled warehouses for sustainably sourced cocoa bean transformation. |
763 | |||
| 22 |
New Hampshire Ball Bearings, Inc. (NHBB)nhbb.com
Specialized manufacturer of precision bearing products for aircraft, defense, dental, medical, and high tech industries, especially aerospace applications. |
712 | |||
| 23 |
TURBOCAM Internationalturbocam.com
A leader in turbomachinery manufacturing, producing prototype and production parts with advanced machining capabilities, specializing in integrally-bladed parts for aerospace engines |
558 | |||
| 24 |
GT Advanced Technologiesonsemi.com
Produces high-quality crystal materials such as silicon carbide and sapphire for advanced semiconductors, lasers, and aerospace/defense applications, focusing on expanding supply and reducing costs |
550 | |||
| 25 |
Crest Foods Co., Inc.crestfoods.com
Family-owned company manufacturing dry food products since 1946 with divisions for dairy stabilizing systems, consumer products, and contract packaging. |
543 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
BURNDYburndy.com
Manufactures connectors, fittings, tools, and grounding/bonding solutions for electrical utilities, contractors, maintenance, telecommunication, and renewable energy markets. |
538 | |||
| 27 |
Symetri USAsymetri.us
A technology consulting firm providing technical services for planning, design, construction, operations, and maintenance of land and buildings for large-scale projects |
492 | |||
| 28 |
Thayer School of Engineering at Dartmouthengineering.dartmouth.edu
Company offers engineering education without departmental divisions, promoting human-centered innovation Programs include MEM, MEng, MS, PhD, dual degrees, and innovative undergraduate and graduate degrees |
466 | |||
| 29 |
iCADicadmed.com
Using AI, we empower healthcare providers to detect cancer more accurately and quickly, optimizing patient outcomes with proven technologies |
363 | |||
| 30 |
Alene Candlesalene.com
A full-service contract manufacturer specialized in creating high-quality, custom-designed fragranced candles for global retail, boutique, and cosmetic brands |
321 | |||
| 31 |
Avantiumavantium.com
Commercialization of technologies converting biomass and CO2 into sustainable materials, including plant-based sugars for FDCA production and advanced catalysis products and services. |
306 | |||
| 32 | 290 | ||||
| 33 |
Farm, A Flex Companyfarmpd.com
A healthcare and life science innovation company offering strategic, technological, and product development services to benefit patients and healthcare providers worldwide |
264 | |||
| 34 |
Galviongalvion.com
The company specializes in designing and delivering purpose-built solutions for military and tactical missions, enhancing agility and survivability for end-users |
257 | |||
| 35 |
ElectroCraftelectrocraft.com
Specializing in custom manufacturing of AC, DC, and stepper motors, gearboxes, drives, and linear actuators for industrial, commercial, and consumer markets |
240 | |||
| 36 | 209 | ||||
| 37 |
Safran Defense & Space, Inc. Optronicssafran-dsi.com
Global leader designing and producing high-performance electro-optics and navigation systems for defense and civil applications, including laser rangefinders, targeting solutions, and custom OEM solutions |
173 | |||
| 38 |
Kalwall Corporationkalwall.com
Innovative provider of diffuse daylighting solutions for sustainable, human-centered building design, offering lightweight, shatterproof panels with unrivaled structural integrity |
138 | |||
| 39 |
Labsphere, Inc.labsphere.com
A global company specializing in high-end light measurement solutions, uniform sources, optical coatings, and instrumentation for various industries |
104 | |||
| 40 |
Haigh-Farr, Inc.haigh-farr.com
Designs, develops, manufactures, and tests conformal antennas for defense, aerospace, and commercial industries, serving high-performance aerospace vehicles and military airborne applications. |
72 | |||
| 41 |
Precitechprecitech.com
This company specializes in designing and manufacturing ultra precision machining solutions for various applications including optical lenses and precision mechanical components |
70 | |||
| 42 |
Macy Industries, Inc.macyindustries.com
Metal fabrication company offering industrial and architectural products, including advanced composites and additive manufacturing services, with a focus on innovative design solutions |
67 | |||
| 43 |
Simbexsimbex.com
Experienced partner in medical device and consumer health product design, specializing in transforming complex ideas into innovative commercial solutions |
55 | |||
| 44 |
Pelham Plastics, Inc.pelhamplastics.com
A contract manufacturer specializing in medical devices, dedicated to turning customer ideas into reality with efficiency and effectiveness |
48 | |||
| 45 |
Rogue Space Systems Corporationrogue.space
Designs satellite vehicles, subsystems providing on-orbit services to satellite operators, setting standards for New Space Economy services. |
29 | |||
| 46 |
G5 Infrared, LLCg5ir.com
Specializing in lens elements, windows, filters, and coatings, providing services for small to high volume production on customer-furnished substrates |
28 | |||
| 47 |
603 OPTX a Micro-LAM Brandmicro-lam.com
Provides diamond turning services for prototype, low volume, and production optical components in various materials, offering turn-key solutions from blanking to coating. |
22 | |||
| 48 |
Optical Fiber Systems Incopticalfibersystems.com
This company specializes in developing and manufacturing customized laser systems, components, and replacement modules, and provides contract design and manufacturing services for medical applications |
6 | |||
| 49 |
Advanced Polymerics, Incapi-smartcoat.com
Innovative company developing smart coatings and functional materials, offering self-healing, VOC-compliant coatings for corrosion protection and moisture control products for various applications |
5 | |||
| 50 | 
Automated Manufacturing Solutions Inc
The company designs and builds custom machinery for welding, assembly, testing, material handling, robotic systems, and offers controls/systems integration services at reasonable prices |
5 | |||
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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 14, 2026.
More company lists in New Hampshire
- The largest companies in New Hampshire 448
- Manufacturers in New Hampshire 62
- Multinational companies in New Hampshire 60
- Critical infrastructure operators in New Hampshire 39
- Hardware manufacturers in New Hampshire 39
- Education providers in New Hampshire 38
- Hospitals and Health Care companies in New Hampshire 36
- Healthcare providers in New Hampshire 35
- Contract manufacturers in New Hampshire 30
- Professional services firms in New Hampshire 26
- IT Services and IT Consulting companies in New Hampshire 25
The same list elsewhere in United States
- Companies with in-house R&D in the United States 6,794
- Companies with in-house R&D in California 1,272
- Companies with in-house R&D in Texas 442
- Companies with in-house R&D in New York State 417
- Companies with in-house R&D in Massachusetts 396
- Companies with in-house R&D in Illinois 322
- Companies with in-house R&D in Michigan 286
- Companies with in-house R&D in Ohio 277
- Companies with in-house R&D in Pennsylvania 255
- Companies with in-house R&D in New Jersey 223
- Companies with in-house R&D in Florida 221
- Companies with in-house R&D in Alabama 220
- Companies with in-house R&D in Georgia 173
- Companies with in-house R&D in Virginia 166
- Companies with in-house R&D in North Carolina 158
- Companies with in-house R&D in Wisconsin 154
- Companies with in-house R&D in Minnesota 146
- Companies with in-house R&D in Washington State 140
- Companies with in-house R&D in Colorado 112
- Companies with in-house R&D in Maryland 107
- Companies with in-house R&D in Indiana 104
- Companies with in-house R&D in New York 223
- Companies with in-house R&D in San Francisco 147
- Companies with in-house R&D in Houston 129