- Granite Island Group
 - Gloucester - Technical surveillance counter measures (tscm), technical and computer security, high security locksmithing, consulting, and training. - Tenant Credit Reports
- Alton Bay - Service for landlords and property management companies.
- Michael Moore Investigative Research
- Boston
- Coyne Consulting Group
- Woburn - Provides investigations, computer forensics, security, and body guard services.
- Shield Investigations & Security Corp.
- Boston - Investigations and security services for the corporate and legal community.
- Bentley Associates, Inc.
- Andover - Investigative consulting firm offering a range services for private and corporate clients.
- Boston Due Process
- Full service legal support company. Private investigators and process servers.
- Pickard & Associates, Inc.
- Wenham - Providing private investigative and consulting services since 1992.
- Insight Investigations
- Saugus - Services the insurance claims industry in workers comp, general liability and automobile claims investigations.
- Summit Investigations
- Braintree - Provides investigative services throughout New England. Summit Investigations focuses on domestic investigations and insurance related services.
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