The professional services firms in New Hampshire presented here are mostly mid-sized companies, with headcounts ranging from 119 to over 3,000 employees. The list shows a strong presence of staffing and recruiting agencies, alongside a variety of other service providers. Many of these companies have been established for several decades, indicating a mature business environment.
Key firms include Pace Analytical Services, which offers analytical testing and life sciences services, and MAS Medical Staffing, a staffing agency founded in 2002. Medicus Healthcare Solutions provides staffing solutions for healthcare organizations, while McLane Middleton, founded in 1919, is a legal services firm. PROCON focuses on integrated architecture, engineering, and construction management services, and Synergetics is a global management consulting firm.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Pace Analytical Servicespacelabs.com
Provides analytical testing, laboratory data, and life sciences services to help businesses, industries, and governments make critical decisions for a safer, healthier world. |
3,184 | |||
| 2 |
MAS Medical Staffingmasmedicalstaffing.com
A staffing agency with 20+ years experience offering per diem, contract, and travel staff through a unique hybrid approach and proprietary technology platform |
636 | |||
| 3 |
Global Technical Talent, an Inc. 5000 Companygttit.com
A subsidiary of Chenega Corporation providing Total Talent Solutions, Global staffing, RPO, and Digital talent services to Fortune 500 clients |
614 | |||
| 4 |
Medicus Healthcare Solutionsmedicushcs.com
This company offers exceptional staffing solutions and locum tenens services to healthcare organizations and providers across the United States |
564 | |||
| 5 |
CoreMedical Groupcoremedicalgroup.com
A leading national healthcare staffing agency specializing in placing nurses, allied healthcare professionals, physicians, and providing full-time permanent and contract/travel staffing services |
553 | |||
| 6 |
Private Health Managementprivatehealth.com
A team of clinical experts provides unparalleled access to top doctors and treatments, navigating the healthcare system for optimal outcomes |
484 | |||
| 7 |
RafterOne | An IPG Companyrafter.one
An expert Salesforce partner specializing in multi-cloud solutions for retail, manufacturing, and technology, offering fast implementation accelerators and digital advisory services |
455 | |||
| 8 |
Goodwin Recruitinggoodwinrecruiting.com
A full-service recruiting agency focused on personalized services, integrity, diversity, and building strong partnerships with clients and candidates across various industries |
433 | |||
| 9 |
Tax Preparergetyourtaxscore.com
Financial services company specializing in tax preparation, located in Newbury, New Hampshire, providing professional assistance with tax planning and compliance |
391 | |||
| 10 |
McLane Middletonmclane.com
A leading law firm founded in New Hampshire in 1919, now the largest in the state, with expertise in various areas of law for clients in New England and beyond |
388 | |||
| 11 |
PROCONproconinc.com
An award-winning firm offering fully-integrated architecture, engineering, and construction management services with a focus on delivering exceptional projects |
358 | |||
| 12 | 290 | ||||
| 13 |
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 | |||
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. | |||||
| 14 |
BA Sciencesbasciences.com
Provider of high-quality analytical testing services to life science companies worldwide, committed to excellence, compliance, and innovation Headquarters in Salem, NH |
257 | |||
| 15 |
Synergetics - A Worldwide Resource For Business Problem Solvingsynergeticsww.com
A respected global management consulting firm partnering with companies to drive growth, enhance performance, and create sustainable improvements in efficiencies and profitability |
119 | |||
| 16 |
Waldron Engineering & Construction, Inc.waldron.com
A full-service firm specializing in analytics, engineering, and construction management for the energy industry, delivering sustainable and cost-effective energy solutions |
58 | |||
| 17 |
Compass Retirement Consulting Groupcompass-cg.com
A Third Party Administrator offering retirement plan design, actuarial services, fiduciary services, ongoing consulting, and a focus on partnership, transparency, and exceptional service |
42 | |||
| 18 |
HTM Companieshtm.com
An organization specializing in advising businesses on operating in the modern era through services like vulnerability analysis and emergency management strategy |
26 | |||
| 19 |
Siltek Corporationsiltekcorp.com
Global IT consulting firm offering customized solutions for Public and Private sectors, specializing in system integration, software development, and IT implementation with a talented team |
17 | |||
| 20 |
Yeoman Technology Group - Swell Mediayeomantechnologies.com
We are experts in optimizing digital strategies for manufacturers, publishers, and educators, focusing on sales, technology impact, and digital product enhancement/creation |
16 | |||
| 21 |
Cohen & Winterscohenwinters.com
Dedicated New Hampshire law firm providing legal assistance in personal injury, family law, criminal defense, estate planning with experienced attorneys |
13 | |||
| 22 | 12 | ||||
| 23 |
Martin, Lord & Osman, P.A.martinlordosman.com
A law practice company located in Laconia, New Hampshire, providing legal services from The Busiel Mill |
12 | |||
| 24 |
Germaine & Blaszka, P.A., Attorneys at Lawgermainelaw.com
A premier law firm with experienced attorneys dedicated to helping individuals and businesses resolve legal issues promptly and affordably, surpassing client expectations |
11 | |||
| 25 |
Brantjes Advocatenbrantjesadvocaten.nl
Ambitious and business-oriented law firm specializing in employment, corporate, and sports law, providing high-quality and personalized legal services through experienced lawyers |
8 | |||
| 26 |
The MEG Companiesthemegcompanies.com
A multifaceted asset management firm specializing in real estate management, commercial brokerage, development administration, and consulting, with a talented team of professionals |
8 | |||
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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
- Companies with in-house R&D in New Hampshire 50
- 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
- IT Services and IT Consulting companies in New Hampshire 25
The same list elsewhere in United States
- Professional services firms in the United States 7,080
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 630
- Professional services firms in Florida 375
- Professional services firms in Virginia 344
- Professional services firms in Illinois 339
- Professional services firms in Massachusetts 249
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 173
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 136
- Professional services firms in Minnesota 124
- Professional services firms in New York 735
- Professional services firms in Chicago 196
- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Washington 109