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18 HARTFORDBUSINESS.COM | NOVEMBER 2, 2026 LARGEST IT AND TELEPHONY SERVICE PROVIDERS IN CONNECTICUT Ranked by number of statewide employees Largest IT and telephony service providers in Connecticut Ranked by number of statewide employees Rank Provider Conn. staff/ 2025 revenue IT services/ other ser other services vices Head of company/ year founded 1 McPhee Electric LLC 505 Main St., Farmington 06032 860-677-9797 • mcpheeusa.com 350 (1) $240,000,000 (2) Networking, security, voice-over-IP/ Data centers, voice, data & video structured cabling Marcus McPhee President 1973 2 Charles IT 10 Main St., Middletown 06457 860-344-9628 • charlesit.com 114 $28,670,410 Backup & disaster recovery, cloud services, compliance assessments, help desk, IT training, managed services, procurement, professional services, remote support, security, virtual CIO, voice-over-IP/ AI readiness, operational maturity consult Foster Charles Owner & CEO 2006 3 The NY-Conn Corp. 5 Shelter Rock Road, Suite 8, Danbury 06810 203-744-9206 • nyconncorp.com 93 (1) $36,000,000 (2) Voice-over-IP/ Data centers, data cabling, CCTV, fire alarm systems, generator systems, voice & data cabling including fiber optics Ross J. Rizzo President Stephanie Mastrogiannis Vice president 1989 4 Systems Integration Inc. 10 Research Parkway, Suite 300, Wallingford 06492 860-513-0100 • sys-int.com 55 N/A Backup & disaster recovery, cloud services, compliance assessments, help desk, hosting, IT consulting, IT training, managed services, networking, procurement, professional services, remote support, security, storage, testing, virtual CIO, virtualization, voice-over-IP/ Ed Rodham President 1992 4 Vancord 500 Boston Post Road, Milford 06460 855-512-4817 • vancord.com 55 N/A Backup & disaster recovery, cloud services, compliance assessments, help desk, IT consulting, IT governance, managed services, professional services, security, virtual CIO/ SOC, vISO Michael J. Grande President & CEO 2005 6 ADNET Technologies LLC 400 Capital Blvd., Suite 101, Rocky Hill 06067 860-409-1700 • thinkadnet.com 50 N/A AI automation, backup & disaster recovery, cloud services, compliance assessments, customized software, help desk, hosting, IT consulting, IT governance, IT staff augmentation, managed services, networking, professional services, remote support, security, virtual CIO, virtualization, voice-over-IP/ Support for CMMC audits, video surveillance Mike Konderwich Senior VP of operations Erin Peterson VP of revenue services 1991 6 TAB Computer Systems Inc. 29-31 Bissell St., East Hartford 06108 860-289-8850 • tabinc.com 50 N/A Backup & disaster recovery, cloud services, compliance assessments, help desk, IT consulting, IT staff augmentation, managed services, networking, remote support, security, virtualization, voice-over-IP/ Anthony Arsenault President 1983 6 Visual Technologies Inc. 50 Columbus Blvd., Hartford 06106 860-251-8003 • vistech.com 50 (3) N/A IT consulting, managed services/ Custom software development, eCommerce; configure, price & quote solutions Richard L. Huebner President & CEO 1995 9 Total Communications Inc. 333 Burnham St., East Hartford 06108 860-282-9999 • totalcomm.com 47 $30,099,208 Backup & disaster recovery, cloud services, compliance assessments, IT consulting, managed services, networking, professional services, remote support, security, storage, testing, voice-over-IP/ Structured cabling, data center, MDR, EDR, XDR Scott Lennon President & CEO 1980 10 Advanced Office Systems 211 Shunpike Road, Cromwell 06416 860-635-7100 • aosinc.com 45 $15,000,000 IT consulting, managed services, networking, professional services/ Computer sales & support Dave M. Wrenn Director 1977 11 CompassMSP 67 Prospect Ave., West Hartford 06106 833-444-2677 • compassmsp.com 41 N/A AI automation, backup & disaster recovery, cloud services, compliance assessments, customized software, help desk, hosting, IT consulting, IT governance, IT staff augmentation, IT training, managed services, networking, procurement, professional services, remote support, security, storage, testing, virtual CIO, virtualization, voice- over-IP/ CMMC advisory services Jivan Achreja Executive chairman 2016 12 Kelser Corp. 43 Western Blvd., Glastonbury 06033 860-610-2200 • kelsercorp.com 36 $104,000,000 Backup & disaster recovery, cloud services, compliance assessments, help desk, IT consulting, managed services, security/ CMMC compliance, lifecycle management Barry Kelly CEO Devin Kelly President 1981 13 Realized Solutions Inc. 1115 West St., Suite 5, Southington 06489 860-410-0670 • myrsi.com 35 $10,000,000 AI automation, backup & disaster recovery, cloud services, customized software, help desk, IT consulting, managed services, networking, professional services, virtual CIO/ Business analytics John W. Beyer CEO 2003 14 ASG Information Technologies 9 S. Cherry St., Wallingford 06492 203-440-4413 • asgct.com 35 $8,000,000 IT consulting, managed services, security, voice-over-IP/ Ryan Kreger CEO 1997 15 The Computer Co. Inc. 15 Commerce Drive, Cromwell 06416 860-635-0500 • computercompany.net 30 N/A Backup & disaster recovery, cloud services, compliance assessments, customized software, help desk, hosting, IT consulting, IT governance, managed services, networking, procurement, remote support, security, storage, virtual CIO, virtualization, voice-over-IP/ Co-location Kevin Barros President 1996 15 Nutmeg Technologies 270 George Washington Road, Enfield 06082 860-899-2222 • nutmegtech.com 30 N/A Backup & disaster recovery, hosting, managed services, networking, remote support, security/ Phone systems Lisa Smith President 2008 17 Connecticut Communications 48 Ozick Drive, Durham 06422 203-985-1000 • ctcom.com 29 $5,000,000 Backup & disaster recovery, cloud services, managed services, networking, voice- over-IP/ Unified communications systems, IP video surveillance, network carrier services Scott Marks President 1974 18 Coopsys 995 Day Hill Road, Windsor 06095 860-523-1000 • coopsys.com 27 N/A AI automation, backup & disaster recovery, cloud services, compliance assessments, help desk, IT consulting, IT governance, IT staff augmentation, managed services, remote support, security, virtual CIO, voice-over-IP/ IT roadmapping Bob DeLisa Founder & CEO Scott Spatz President 1993 19 EBM Inc. 35 Nutmeg Drive, Suite 210, Trumbull 06611 203-254-8500 • ebmusa.com 24 N/A Backup & disaster recovery, cloud services, compliance assessments, help desk, hosting, IT consulting, IT governance, IT staff augmentation, managed services, networking, procurement, professional services, remote support, security, storage, virtual CIO, virtualization, voice-over-IP/ Christopher J. Daly President & CEO Thomas Basdekis Chief revenue officer 1972 20 Connecticut Business Technology Group (CBTG) 5 Progress Drive, Cromwell 06416 860-358-9460 • cbtechgroup.com 20 N/A Backup & disaster recovery, compliance assessments, help desk, IT consulting, IT staff augmentation, managed services, networking, procurement, professional services, remote support, security, virtual CIO, virtualization, voice-over-IP/ Craig Hendrickson Co-founder & CEO 2010 Source: Each provider via survey as of Q3 2026, corporate websites and press releases. Unable to confirm data by press time for Farmington's iTech Solutions Inc., Hartford's CMIT Solutions, Manchester's Abele Technologies or Rocky Hill's Alarm New England. N/A = Not available. ACD = automatic call distribution, CCTV = closed circuit television, CIO = chief information officer, CMMC = Cybersecurity Maturity Model Certification, EDR = endpoint detection and response, HIPAA = Health Insurance Portability and Accountability Act, IP = internet protocol, IT = information technology, MDR = managed detection & response, MFA = multi-factor authentication, POS = point of sale, SEO = search engine optimization, SIEM = security information & event management, SIP = session initiation protocol, SMS = short message service, SOC = security operations center, vCISO = virtual chief information security officer, vISO = virtual information security office, XDR = extended detection and response. (1) Employee count includes staff that work on other electrical projects in addition to data and voice projects. (2) Includes revenue from other electrical projects in addition to data and voice projects. (3) From HBJ's 2025 survey. -Compiled by Stephanie R. Meagher, research@nebusinessmedia.com The Lists