Companies in New Hampshire
274.9K companies registered in New Hampshire, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the New Hampshire business base breaks down by industry and headcount.
Part of the United States company directory.
Rankings
Largest companies in New Hampshire
By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.
| # | Company | Industry | City | Revenue (USD) | Employees |
|---|---|---|---|---|---|
| 1 | Iron Mountain Incorporated | Removal services | Portsmouth | $6.9B | 29,400 |
| 2 | Dartmouth-Hitchcock Health | General medical practice activities | Lebanon | $4.3B | 8,000 |
| 3 | Sprague Resources LP | Wholesale of solid, liquid and gaseous fuels and related products | Portsmouth | $3.5B | 901 |
| 4 | Mary Hitchcock Memorial Hospital | Hospital activities | Lebanon | $3.4B | 8,000 |
| 5 | CP Energy LLC | Trade of gas through mains | Nashua | $3B | 30 |
| 6 | PC Connection, Inc. | Retail sale via mail order houses or via Internet | Merrimack | $2.9B | 2,525 |
| 7 | Public Service Company of New Hampshire | Electric power generation, transmission and distribution | Manchester | $1.4B | 802 |
| 8 | Planet Fitness, Inc. | Fitness facilities | Hampton | $1.3B | 4,020 |
| 9 | Albany International Corp. | Weaving of textiles | Portsmouth | $1.2B | 5,700 |
| 10 | Elliot Health System | Hospital activities | Manchester | $912M | 3,400 |
| 11 | Concord Hospital, Inc. | Hospital activities | Concord | $903M | 2,000 |
| 12 | Allegro Microsystems, Inc. | Manufacture of electronic components and boards | Manchester | $890M | 4,250 |
| 13 | Standex International Corporation | Manufacture of metal forming machinery | Salem | $790M | 4,100 |
| 14 | University System of New Hampshire | Tertiary education | Concord | $732M | 16,000 |
| 15 | Dartmouth-Hitchcock Clinic | Hospital activities | Lebanon | $638M | 7,999 |
| 16 | Wentworth-Douglass Hospital | Hospital activities | Dover | $597M | 1,700 |
| 17 | Southern New Hampshire Health System, Inc. | Hospital activities | Nashua | $545M | 1,201 |
| 18 | Unitil Corporation | Steam and air conditioning supply | Hampton | $536M | 595 |
| 19 | Skillsoft (US) LLC | Software publishing | Nashua | $531M | 2,200 |
| 20 | Catholic Healthcare Trust | Hospital activities | Manchester | $524M | 1,500 |
| 21 | Cht Healthcare System | Hospital activities | Manchester | $518M | 61 |
| 22 | Skillsoft Corp. | Software publishing | Nashua | $513M | 2,247 |
| 23 | Delta Dental Plan of New Hampshire, Inc. | Non-life insurance | Concord | $497M | 358 |
| 24 | Southern New Hampshire Medical Center | Hospital activities | Nashua | $428M | 1,200 |
| 25 | Liquid Pc, LLC | Wholesale of computers, computer peripheral equipment and software | Portsmouth | $387M | 30 |
Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.
Iron Mountain Incorporated leads New Hampshire at $6.9B in reported revenue, from Portsmouth.
Coverage
Companies by industry in New Hampshire
The industries holding the most companies, by NACE activity code.
Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.
Browse these directories
Other business support service activities n.e.c. is the largest activity in New Hampshire, with 15,261 companies.
Distribution
Company size
By number of employees.
3,507 companies have no disclosed headcount (excluded from the chart).
89% of New Hampshire companies with a disclosed headcount fall in the 1-4 employee band.
Data coverage
What a New Hampshire record carries
Share of the state's companies holding each contact field.
30%
with a website
63%
with a phone number
20%
with an email address
Counted against the 274.9K companies in New Hampshire. Firmographics — industry, size, address, status — are present on every record.
FAQ
Companies in New Hampshire — frequently asked questions
Need the full New Hampshire company file?
Export 274.9K New Hampshire companies with firmographics, size, location and contact fields — API, bulk file or CRM enrichment.