Apprenticeship Sponsor — page 12 of 20
5,826 businesses with an active “Apprenticeship Sponsor” credential — administered by the Department of Labor. State file of October 1, 2026.
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| Place | Business | Record | Credentials | Latest expiration |
|---|---|---|---|---|
| Southington, CT | LYNX SYSTEMS LLC | 147BFC7BC3 | Apprenticeship Sponsor + 2 more | Jun 30, 2027 |
| Meriden, CT | Lyons Tool & Die Company | A638C1606A | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartland, CT | M & E Electric, LLC | 028FCBE9CB | Apprenticeship Sponsor | Jun 30, 2017 |
| North Haven, CT | M & G Plumbing & Heating Inc. | FF08E3640F | Apprenticeship Sponsor | Jun 30, 2021 |
| Torrington, CT | M & J Sheet Metal LLC | 76A5E51F59 | Apprenticeship Sponsor | Jun 30, 2022 |
| East Hartford, CT | M & K Plumbing Solutions, LLC | 913DAF3E61 | Apprenticeship Sponsor | Jun 30, 2027 |
| West Springfield, MA | M & M ELECTRICAL SERVICES, INC. | B8F2361960 | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | M & M Energy Solutions Inc. | 86102E80BE | Apprenticeship Sponsor | Jun 30, 2025 |
| Woodbridge, CT | M & M Fuel Oils, Inc. | 20B817B408 | Apprenticeship Sponsor | Jun 30, 2019 |
| Bridgeport, CT | M & M Heating & Cooling, LLC | BBDA86E6E9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bolton, CT | M & M Oil LLC | FD619EAB3B | Apprenticeship Sponsor | Jun 30, 2018 |
| Bridgeport, CT | M & O CORPORATION | A59C7F9E57 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | M & R MECHANICAL SERVICES, LLC | C1AA3E5242 | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainfield, CT | M & S Electric | 4B104B29CF | Apprenticeship Sponsor | Jun 30, 2007 |
| Ansonia, CT | M & S Electric, LLC | 7B6C7506AE | Apprenticeship Sponsor | Jun 30, 2027 |
| Naugatuck, CT | M & S Mechanical, LLC | 2ADE7CF142 | Apprenticeship Sponsor | Jun 30, 2026 |
| North Franklin, CT | M & W Sheet Metal LLC | C361D9EE18 | Apprenticeship Sponsor | Jun 30, 2015 |
| Old Lyme, CT | M BRETT PAINTING CO INC | 092A4FFC44 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Vernon, CT | M-W Electric, Inc. | C49870F2A5 | Apprenticeship Sponsor | Jun 30, 2014 |
| Westbrook, CT | M. Adorno, LLC | BD31EE8679 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| North Stonington, CT | M. Deshefy Plumbing LLC | E3AC15A701 | Apprenticeship Sponsor | Jun 30, 2026 |
| Roxbury, CT | M. Johnson Electrical Contractors Inc. | 9E171CFE74 | Apprenticeship Sponsor | Jun 30, 2011 |
| Danbury, CT | M. Monteiro & Son, Inc. | BCAF53E12D | Apprenticeship Sponsor | Jun 30, 2011 |
| Norwalk, CT | M. Picci Plumbing & Heating LLC | D0223FF684 | Apprenticeship Sponsor | Jun 30, 2015 |
| New Hartford, CT | M. R. Koether Plumbing & Heating LLC | FB8E533AA2 | Apprenticeship Sponsor | Jun 30, 2026 |
| Norfolk, CT | M. R. Plumbing | 423BF68686 | Apprenticeship Sponsor | Jun 30, 2005 |
| Plainfield, CT | M. Walenta Enterprises LLC | E3D9DE55C9 | Apprenticeship Sponsor | Jun 30, 2020 |
| Naugatuck, CT | M. Wilcox Heating LLC | 265EEA0D5F | Apprenticeship Sponsor | Jun 30, 2010 |
| West Hartford, CT | M.A. Arnold LLC | 84C9837C1F | Apprenticeship Sponsor | Jun 30, 2023 |
| Shelton, CT | M.A. GARAMELLA CO. INC. | 9093FD75D3 | Apprenticeship Sponsor | Jun 30, 2026 |
| Wethersfield, CT | M.A.O. Electric, L.L.C. | 85E1284F3B | Apprenticeship Sponsor | Jun 30, 2023 |
| Bethel, CT | M.A.R.S. ELECTRIC, LLC | 587D1C3F43 | Apprenticeship Sponsor | Jun 30, 2027 |
| The Villages, FL | M.B. Martin Electric LLC | D32009C169 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | M.E.K. Electric Company, LLC | 891F424990 | Apprenticeship Sponsor | Jun 30, 2010 |
| Orange, CT | M.E.M. Heating & Cooling, LLC | E1E1E287BB | Apprenticeship Sponsor | Jun 30, 2011 |
| Columbia, CT | M.F. Barrea Plumbing | A7F0F44CBF | Apprenticeship Sponsor | Jun 30, 2011 |
| New Milford, CT | M.F. Chiarella Heating & Cooling LLC dba: Aireserv Heating & Air Conditioning | 67675E3558 | Apprenticeship Sponsor | Jun 30, 2019 |
| Pequabuck, CT | M.F. Dionne, LLC | B279EBCC8D | Apprenticeship Sponsor | Jun 30, 2021 |
| Longmeadow, MA | M.G. Electrical Services, LLC | 50A939449A | Apprenticeship Sponsor | Jun 30, 2007 |
| Stamford, CT | M.J. Cognetta Electrical Contractors | DEAA5E95F2 | Apprenticeship Sponsor | Jun 30, 2018 |
| Waterbury, CT | M.J. Daly LLC | 7D40CBDCE1 | Apprenticeship Sponsor | Jun 30, 2024 |
| Watertown, CT | M.J. Downey Plumbing, LLC | 2F1AAA298C | Apprenticeship Sponsor | Jun 30, 2018 |
| Glastonbury, CT | M.J. Emonds Mechanical Contractors | 1659041B3C | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | M.J. Fahy & Sons, Inc. | 4C50B8849E | Apprenticeship Sponsor | Jun 30, 2027 |
| Falls Village, CT | M.J. Lomax Heating Specialist | CE54D7DCF8 | Apprenticeship Sponsor | Jun 30, 2009 |
| Bethel, CT | M.J. Losito Electrical Contractors, Inc. | 012BF3DC5C | Apprenticeship Sponsor | Jun 30, 2024 |
| Southbury, CT | M.J. Zeno Plumbing & Heating, LLC | 291DCA0715 | Apprenticeship Sponsor | Jun 30, 2019 |
| Rocky Hill, CT | M.S.F. Electric, LLC | 0DA597BF30 | Apprenticeship Sponsor | Jun 30, 2026 |
| Sandy Hook, CT | M4 Electrical Contracting LLC | 85219FF5A8 | Apprenticeship Sponsor | Jun 30, 2024 |
| North Branford, CT | Mac 4 Plumbing, LLC | 85210855F4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Greenwich, CT | MAC Coms, LLC | ADB9207257 | Apprenticeship Sponsor | Jun 30, 2028 |
| Coventry, CT | Mac Electric, LLC | BA1E7A6CF2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Mac Electrical Contractor, LLC | 415432A0D6 | Apprenticeship Sponsor | Jun 30, 2024 |
| Voluntown, CT | MAC Mechanical Services LLC | FB147D5AEA | Apprenticeship Sponsor | Jun 30, 2027 |
| Monroe, CT | MAC Plumbing Service, LLC | 60E4F7A3C4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Thomaston, CT | Macary's Plumbing Services | 941CE9FBA8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Cromwell, CT | MacDonald Industrial Services, Inc. | 6800229B05 | Apprenticeship Sponsor | Jun 30, 2015 |
| Canterbury, CT | MacDougall Electrical Services | 6A529D8391 | Apprenticeship Sponsor | Jun 30, 2008 |
| Plainville, CT | Mace Company LLC | 12B1A340DB | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Macedonia Plumbing | 385605EB77 | Apprenticeship Sponsor | Jun 30, 2024 |
| Old Lyme, CT | MACHNIK BROS INC | 4FC9F2EF96 | Major Contractor + 2 more | Jun 30, 2027 |
| Middletown, CT | Mack Fire Protection, LLC | 52694DA180 | Apprenticeship Sponsor | Jun 30, 2026 |
| Vernon, CT | MacLean's Mechanical Contractors, LLC | 15FF1F39D5 | Apprenticeship Sponsor | Jun 30, 2024 |
| Pawcatuck, CT | MacMahon Plumbing & Heating | DD79D010F6 | Apprenticeship Sponsor | Jun 30, 2008 |
| North Branford, CT | Maco Machinery Co., Inc. dba Artec Machine Systems Inc. | 402F11AFBA | Apprenticeship Sponsor | Jun 30, 2023 |
| Avon, CT | Macri Associates Inc. | 75BA1AFE0D | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | MacVane Electrical Services, LLC | 92E5803A2D | Apprenticeship Sponsor | Jun 30, 2027 |
| Ellington, CT | MACVARISH PLUMBING SERVICES, LLC | 1AB38196A3 | Apprenticeship Sponsor | Jun 30, 2025 |
| Seymour, CT | MAD Solutions, LLC | 3BF7687479 | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | Made in USA Solar, LLC | B239172300 | Apprenticeship Sponsor | Jun 30, 2017 |
| Madison, CT | Madison Electric LLC | E3A6A1F046 | Apprenticeship Sponsor | Jun 30, 2009 |
| Norwalk, CT | Magic Electric, LLC | 9DD6E5B390 | Apprenticeship Sponsor | Jun 30, 2006 |
| Hartford, CT | Magnet Electrical Contractors, Inc. | 5FE9A5F86F | Apprenticeship Sponsor | Jun 30, 2005 |
| Shelton, CT | Mahoney Electric LLC | 7B7C797942 | Apprenticeship Sponsor | Jun 30, 2008 |
| Wolcott, CT | Mailly Manufacturing Co., Inc. | 5D6615FD8E | Apprenticeship Sponsor | — |
| Stratford, CT | Main Enterprises Inc. | 5592BF2F70 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | Maine Light & Power | 170690ACEB | Apprenticeship Sponsor | Jun 30, 2006 |
| Windham, CT | Mainline Electric LLC | ED580D53AC | Apprenticeship Sponsor | Jun 30, 2027 |
| South Windsor, CT | Mainville Electric, LLC | 21ECD482D7 | Apprenticeship Sponsor | Jun 30, 2015 |
| Niantic, CT | Majestic Electric Co. Osso Associates LLC | BC8504CD6F | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | Making Power Moves, LLC | D704DB1F3F | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Maklari Electric Corp. | 71BE35E1E9 | Apprenticeship Sponsor | Jun 30, 2013 |
| Milford, CT | Malangone Electric, LLC | C8AE0E0CFC | Apprenticeship Sponsor | Jun 30, 2017 |
| Bethany, CT | Malangone Heating & Cooling, Inc. | C6591D5E7E | Apprenticeship Sponsor | Jun 30, 2023 |
| West Haven, CT | Malangone Plumbing, LLC | 673105F533 | Apprenticeship Sponsor | Jun 30, 2016 |
| Stratford, CT | MALETON PLUMBING AND HEATING | 160F230344 | Apprenticeship Sponsor | Jun 30, 2026 |
| Milford, CT | Malin and Sons, LLC | 3FF4CBDAD1 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Farmington, CT | Mallory Industries, Inc. | 2C59F93B8B | Apprenticeship Sponsor | Jun 30, 2020 |
| East Haven, CT | Malone Electric LLC | 568EDF78FF | Apprenticeship Sponsor | Jun 30, 2011 |
| New Britain, CT | Mammoth Security, Inc. | 41DC8F4F54 | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | MANAFORT BROTHERS INC. | AA0F8EBCBC | Demolition Contractor + 1 more | Sep 30, 2027 |
| Manchester, CT | Manchester Glass Co. Inc. | C27A2023B0 | Apprenticeship Sponsor | Jun 30, 2014 |
| Manchester, CT | MANCHESTER HOSPITAL | 1ED51C8968 | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | Manchester Municipal Federal Credit Union | 5C6DD815F1 | Apprenticeship Sponsor | Jun 30, 2020 |
| Manchester, CT | Manchester Public Schools | 2E2FB8BF0B | Apprenticeship Sponsor | Jun 30, 2025 |
| Darien, CT | Mancuso Electric Inc. | DEC6040706 | Apprenticeship Sponsor | Jun 30, 2022 |
| Rocky Hill, CT | Mangiafico Electric, LLC | FF29A000E0 | Apprenticeship Sponsor | Jun 30, 2023 |
| Winsted, CT | Mangione Plumbing & Heating, LLC | 99903723CD | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | Manocchio Enterprises, Inc. dba Allied Lawn Sprinklers | 6F03804A2F | Apprenticeship Sponsor | Jun 30, 2011 |
| Storrs Mansfield, CT | MANSFIELD DISCOVERY DEPOT | 63B0741B0B | Child Care Center + 1 more | May 31, 2030 |
| Wallingford, CT | Mansolf Plumbing & Heating, LLC | 258324927C | Apprenticeship Sponsor | Jun 30, 2024 |
| Woodbridge, CT | Manufacturers Service Co. Inc. bda Air Handling Systems | 6A17E58D9A | Apprenticeship Sponsor | Jun 30, 2027 |
| Niantic, CT | Manwaring Electric, LLC | 81C22C65AD | Apprenticeship Sponsor | Jun 30, 2016 |
| Woodbury, CT | Maple Valley Electric, LLC | D8AF51A50E | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | MARANDOLA FUEL SERVICE | 8D38FA226B | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Marbledale, CT | Marbledale Plumbing & Heating, LLC | 36BCFC86F2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southwick, MA | Marc's Electric Co., Inc. | B9215208C9 | Apprenticeship Sponsor | Jun 30, 2007 |
| Stafford Springs, CT | MARC'S PLUMBING LLC STAFFORD REMODELING | F86F727AA0 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Wilton, CT | Marchese Electric LLC | 718C8701AC | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Marcinczyk Electric | 714488ECBC | Apprenticeship Sponsor | Jun 30, 2016 |
| Enfield, CT | MARCOM COMMUNICATIONS, INC. | 9DCF8DFD4F | Apprenticeship Sponsor | Jun 30, 2026 |
| North Franklin, CT | Marcotte Electric | 76723660DC | Apprenticeship Sponsor | Jun 30, 2009 |
| Manchester, CT | Marcus Communications, LLC | 6F71C0E730 | Apprenticeship Sponsor | Jun 30, 2020 |
| West Hartford, CT | Marec Heating & Air Conditioning, Inc. | 042CE6A590 | Apprenticeship Sponsor | Jun 30, 2025 |
| Bethany, CT | Marga Services Company, Inc. | 9BF0BB54E7 | Apprenticeship Sponsor | Jun 30, 2012 |
| Killingworth, CT | Marino Electric, Inc. | C66F2CA145 | Apprenticeship Sponsor | Jun 30, 2016 |
| Winsted, CT | Marino Electrical Contractors LLC | DD25F5CC1E | Apprenticeship Sponsor | Jun 30, 2009 |
| Branford, CT | MARINO MECHANICAL, INC. | CB8363871B | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | Marino's Fuel Oils, Inc. | B279D3D24A | Apprenticeship Sponsor | Jun 30, 2006 |
| Windsor Locks, CT | Marinone Electric Inc. | 7A313894A8 | Apprenticeship Sponsor | Jun 30, 2010 |
| Putnam, CT | MARINOS BARBERSHOP | 89B78FAF8C | Apprenticeship Sponsor | Jun 30, 2026 |
| Oakville, CT | Mario Perugini Electric, Inc. | 4C6CD23803 | Apprenticeship Sponsor | Jun 30, 2008 |
| Stratford, CT | MARIO'S ELECTRICAL TECHNOLOGIES LLC | 4C1551FE3F | Apprenticeship Sponsor | Jun 30, 2027 |
| Cheshire, CT | Marion Manufacturing Co. | 3857CD8979 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hampton, CT | Mark Cibula Plumbing & Heating, LLC | 88FACC6122 | Apprenticeship Sponsor | Jun 30, 2023 |
| Danielson, CT | Mark Curreri Plumbing & Heating | 808A92FF80 | Apprenticeship Sponsor | Jun 30, 2004 |
| Bethel, CT | Mark D. Anderson Plumbing | D532659FF9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlebury, CT | Mark Electric LLC | 9ED8119650 | Apprenticeship Sponsor | Jun 30, 2020 |
| Wolcott, CT | Mark Eyelet Inc. | B17C4F333A | Apprenticeship Sponsor | Jun 30, 2005 |
| Canaan, CT | Mark Ustico Plumbing and Heating, LLC | D3169ACEF7 | Apprenticeship Sponsor | Jun 30, 2016 |
| Woodbridge, CT | Mark's Total Security LLC | FB0169F341 | Apprenticeship Sponsor | Jun 30, 2006 |
| Harwinton, CT | Markel Electric | EBEE236707 | Apprenticeship Sponsor | Jun 30, 2027 |
| Trumbull, CT | Markland Plumbing & Heating LLC | 0D0D9DBB6D | Apprenticeship Sponsor | Jun 30, 2011 |
| West Hartford, CT | Marks Plumbing LLC | B058F4D966 | Apprenticeship Sponsor | Jun 30, 2012 |
| Lebanon, CT | Marlborough Heating & Air Conditioning, LLC | 06D53D28C4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Marlin Electric, LLC | 54D456A8D4 | Apprenticeship Sponsor | Jun 30, 2020 |
| Guilford, CT | Marlin Mechanical Inc. | F92A622F14 | Apprenticeship Sponsor | Jun 30, 2013 |
| Seymour, CT | Marmon Utility LLC | EC4E69CC9C | Apprenticeship Sponsor | Jun 30, 2012 |
| Weston, CT | Marrick Plumbing & Heating Inc. | 68262EC833 | Apprenticeship Sponsor | Jun 30, 2014 |
| Monroe, CT | Marsco Sheetmetal LLC | 5A3D877022 | Apprenticeship Sponsor | Jun 30, 2008 |
| Brookfield, CT | Martin Flynn Plumbing, LLC | 56BEE659DB | Apprenticeship Sponsor | Jun 30, 2018 |
| Wolcott, CT | Martin Mechanical | CC88139DA2 | Apprenticeship Sponsor | Jun 30, 2012 |
| Bethlehem, CT | Martin Plumbing & Heating Inc. | 1D52675107 | Apprenticeship Sponsor | Jun 30, 2012 |
| Waterbury, CT | MARTIN'S LANDSCAPING, INC. | 938918353C | Pesticide Application Business Registration + 2 more | Aug 31, 2027 |
| Hartford, CT | Marzano Plumbing & Heating LLC | 53C3B8073B | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Mas Mechanical | 90AA290EEB | Apprenticeship Sponsor | Jun 30, 2018 |
| Colchester, CT | Mascaro Electric LLC | D8DCDB07C1 | Apprenticeship Sponsor | Jun 30, 2013 |
| Torrington, CT | Mascetti's Plumbing, Sewer and Drain | B48BB22CC6 | Apprenticeship Sponsor | Jun 30, 2017 |
| Southington, CT | Masotti Electric LLC | 7F400B0A0A | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | MasRam Mechanical, LP | 200B464ABD | Apprenticeship Sponsor | Jun 30, 2014 |
| Bridgeport, CT | Massey Fuel Inc. | 15AF2BC5A6 | Apprenticeship Sponsor | Jun 30, 2017 |
| Southbury, CT | Massimino Plumbing, LLC | 784DB1288B | Apprenticeship Sponsor | Jun 30, 2015 |
| Waterbury, CT | Massimo Heating & Cooling | D293D7D954 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | Master Mechanical, LLC | 8E26EC4217 | Apprenticeship Sponsor | Jun 30, 2026 |
| Stratford, CT | Master Plumbing & Drain Cleaning | C242B5230C | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlebury, CT | Master Security Systems, Inc. | DD05F0D243 | Apprenticeship Sponsor | Jun 30, 2022 |
| Southington, CT | Mastercraft Tool & Machine Co. | 048A5FAC48 | Apprenticeship Sponsor | Jun 30, 2020 |
| Wallingford, CT | Masters Heating and Air Conditioning, Inc. | 46C0ECE3B8 | Apprenticeship Sponsor | Jun 30, 2020 |
| Terryville, CT | Masterson Electric, LLC | A261804DC0 | Apprenticeship Sponsor | Jun 30, 2014 |
| Coventry, CT | Matchless Fire Protection | EB302644F3 | Apprenticeship Sponsor | Jun 30, 2021 |
| West Hartford, CT | Materials Handling Systems, Inc. | B3A8EE1581 | Apprenticeship Sponsor | Jun 30, 2008 |
| Bloomfield, CT | Mather Corporation, Inc. | 74005A6551 | Apprenticeship Sponsor | Jun 30, 2022 |
| Riverside, CT | Matt Falco Plumbing & Heating Inc. | 2120599C33 | Apprenticeship Sponsor | Jun 30, 2008 |
| Berlin, CT | Matt's Pro Plumbing, LLC | D0E268EA86 | Apprenticeship Sponsor | Jun 30, 2024 |
| North Haven, CT | Matteo Plumbing, LLC | 93DECBBA22 | Apprenticeship Sponsor | Jun 30, 2015 |
| Baltic, CT | MATTERN CONSTRUCTION INC | C8B89A1027 | Major Contractor + 3 more | Jun 30, 2027 |
| Windsor Locks, CT | Matthew Valente Plumbing | 16C3BF76D8 | Apprenticeship Sponsor | Jun 30, 2021 |
| Berlin, CT | Matthew Warren, Inc. dba Tri-Star Industries | 0C1F17B6F9 | Apprenticeship Sponsor | Jun 30, 2021 |
| Seymour, CT | Matthew Warren, Inc. RAF Electronic Hardware | FCC655C8F2 | Apprenticeship Sponsor | Jun 30, 2025 |
| Bethel, CT | Matthews Contracting | F518092A95 | Apprenticeship Sponsor | Jun 30, 2023 |
| Enfield, CT | Matthews Electric, LLC | 6F1E80E95A | Apprenticeship Sponsor | Jun 30, 2023 |
| Coventry, CT | Maulucci Electric, LLC | 2FD1456177 | Apprenticeship Sponsor | Jun 30, 2027 |
| Moodus, CT | MAUS & SON INC | CB84241A23 | Home Heating Fuel Dealer + 3 more | Sep 30, 2027 |
| Stafford Springs, CT | Max-Solar, LLC | 7B5B02E98E | Apprenticeship Sponsor | Jun 30, 2022 |
| Madison, CT | Maximum Electric, LLC | 870FBE3534 | Apprenticeship Sponsor | Jun 30, 2016 |
| Middlebury, CT | Maximum Home Performance, LLC | EA2F3CF561 | Apprenticeship Sponsor | Jun 30, 2018 |
| Milldale, CT | Maximum Sound & Security Dynamic Security Systems, INC. | EAE722147C | Apprenticeship Sponsor | Jun 30, 2022 |
| Preston, CT | Maxum Enterprises, LLC | 684B600203 | Apprenticeship Sponsor | Jun 30, 2009 |
| Waterford, CT | MAXUM IRRIGATION GROUP, LLC | 531E892834 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterford, CT | Maxum Irrigation, LLC | 2F96C55A45 | Apprenticeship Sponsor | Jun 30, 2017 |
| Lisbon, CT | Maynard Electric LLC | EAF881A329 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Mazur Mechanical, LLC | 482AE85B7C | Apprenticeship Sponsor | Jun 30, 2020 |
| Fairfield, CT | Mazzucco Electric, LLC | 26A8D880A7 | Apprenticeship Sponsor | Jun 30, 2023 |
| East Granby, CT | MB Aerospace East Granby | 26E9F7A5B7 | Apprenticeship Sponsor | Jun 30, 2024 |
| Southington, CT | MB Plumbing LLC | C5EFFBDC37 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | MC Electric | E0CCF62CE7 | Apprenticeship Sponsor | Jun 30, 2006 |
| Meriden, CT | MC Electrical and Design, LLC | 8E5967AEFC | Apprenticeship Sponsor | Jun 30, 2017 |
| Plainville, CT | MC Electrical Contracting, LLC | 5B5E49C17E | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Prospect, CT | MCALLEN CONSTRUCTION INC | 0DC31DBE40 | Major Contractor + 3 more | Jun 30, 2027 |
| Plymouth, CT | McCallum Die Co., Inc. | 63C0FD7540 | Apprenticeship Sponsor | Jun 30, 2004 |
| Wallingford, CT | MCCANN SYSTEMS, LLC | 53F32BDBFD | Apprenticeship Sponsor | Jun 30, 2027 |
| South Windsor, CT | MCCARTHY CONCRETE INC | 9195824F3E | Major Contractor + 1 more | Jun 30, 2027 |
| Kent, CT | McCarthy Electric LLC | 2EAEC6BE33 | Apprenticeship Sponsor | Jun 30, 2017 |
| Quaker Hill, CT | MCCARTHY HEATING OIL SERVICE INC | 2E312ACDA2 | Motor Fuel Quality Registration + 3 more | Oct 31, 2027 |
| Baltic, CT | MCCLURE MECHANICAL SERVICES LLC | C7AA368119 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Roxbury, CT | McCormack Electric | CE9FC066D8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | McCormack Electric Company | D868403D7C | Apprenticeship Sponsor | Jun 30, 2007 |
| Manchester, CT | McGill Electric LLC | 1AB8C976D7 | Apprenticeship Sponsor | Jun 30, 2022 |
| Milford, CT | McGuire Electric, LLC | AD733A1CD0 | Apprenticeship Sponsor | Jun 30, 2019 |
| Voluntown, CT | MCGUIRE PLUMBING & HEATING | F8726DDAA9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | MCI Security Systems | 703F54DDE4 | Apprenticeship Sponsor | Jun 30, 2010 |
| Norwalk, CT | MCK Heating & Air Conditioning Inc. | 5BFA1CEA4C | Apprenticeship Sponsor | Jun 30, 2020 |
| Newtown, CT | McKenney Mechanical Contractors, Inc. | 44B0357135 | Apprenticeship Sponsor | Jun 30, 2012 |
| West Springfield, MA | MCL Mechanical Services, Inc. | E22AF6C5D6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | McLain Electric Co. Inc. | 368E651F13 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | MCM Plumbing LLC | 1C53E5BB9A | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | McMellon Bros., Inc. | F8B4163B89 | Apprenticeship Sponsor | Jun 30, 2025 |
| Stratford, CT | McMellon J. Oross, LLC | A6F6E3FE40 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Terryville, CT | McMillan Electric, LLC | F650EFE753 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | MCN Telecom LLC | 3BC18C1E70 | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | McNelly Electric, LLC | BCD32D1636 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | MCR Plumbing & Restoration Co., LLC | 6CE17E8AB3 | Apprenticeship Sponsor | Jun 30, 2019 |
| Danielson, CT | MCR Refrigeration, LLC | B36F62C953 | Apprenticeship Sponsor | Jun 30, 2015 |
| Oxford, CT | MD Electric LLC | F40EB23B36 | Apprenticeship Sponsor | Jun 30, 2006 |
| Granby, CT | MD ELECTRICAL CONSTRUCTION INC. | 2B3C852E82 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wethersfield, CT | MD Mechanical Services, LLC | AA3664C9FA | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | MD Plumbing & Heating, LLC | 0E4B3A09A2 | Apprenticeship Sponsor | Jun 30, 2010 |
| Danielson, CT | MD Plumbing LLC | 35C745B2D8 | Apprenticeship Sponsor | Jun 30, 2008 |
| Bridgeport, CT | MDM Electric | C75EA1B19C | Apprenticeship Sponsor | Jun 30, 2021 |
| New Haven, CT | MDR Enterprises, LLC | 2ECC3EC3F5 | Apprenticeship Sponsor | Jun 30, 2005 |
| Greenwich, CT | Mecca Electric of Rye | 8E4F1603EB | Apprenticeship Sponsor | Jun 30, 2027 |
| North Haven, CT | Mechanical Air, LLC | 73742C9673 | Apprenticeship Sponsor | Jun 30, 2020 |
| Newington, CT | Mechanical Energy, LLC | 81B9B0F351 | Apprenticeship Sponsor | Jun 30, 2013 |
| New Haven, CT | Mechanical Heating & Air Conditioning, Inc. | 198B24E681 | Apprenticeship Sponsor | Jun 30, 2027 |
| South Windsor, CT | Mechanical Maintenance Co. | A0DE649CA6 | Apprenticeship Sponsor | Jun 30, 2022 |
| Hamden, CT | MECHANICAL PLUMBING & HEATING, INC. | 8269046288 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethlehem, CT | MECHANITECH HVAC SOLUTIONS LLC | 472A02B1AF | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Cheshire, CT | Mechanix III | 63B25FC6D0 | Apprenticeship Sponsor | Jun 30, 2016 |
| Windsor, CT | MechTech, Inc. | FBAD4693B9 | Apprenticeship Sponsor | Jun 30, 2011 |
| Southington, CT | Medex | CA718666FF | Apprenticeship Sponsor | Jun 30, 2006 |
| N. Billerica, MA | Medford Wellington Service Company | 3BDAE7E067 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | MEDI, LLC dba Eyelet Design | 9B14CB609C | Apprenticeship Sponsor | Jun 30, 2022 |
| Hamden, CT | Medium Well Inc. DBA Harris Web Works | 7AAF58C369 | Apprenticeship Sponsor | Jun 30, 2017 |
| North Haven, CT | Medtronic | D3911DFCC3 | Apprenticeship Sponsor | Jun 30, 2025 |
| Norwalk, CT | Meenan Brothers Construction, LLC | 2A71FF71BB | Apprenticeship Sponsor | Jun 30, 2013 |
| Bridgeport, CT | Meg Electric Inc. | 2CF0100FFD | Apprenticeship Sponsor | Jun 30, 2008 |
| North Stonington, CT | Melia Electric | 59D61BD4CE | Apprenticeship Sponsor | Jun 30, 2012 |
| Stamford, CT | Melia Plumbing & Heating, Inc. | 783ABDC116 | Apprenticeship Sponsor | Jun 30, 2026 |
| Wolcott, CT | Membrino Electric LLC | 05B92ABD3A | Apprenticeship Sponsor | Jun 30, 2010 |
| Lisbon, CT | Men of Action, LLC | E02CD06984 | Apprenticeship Sponsor | Jun 30, 2026 |
| Newington, CT | MENDEZ ELECTRICAL SERVICES LLC | 6A400FD586 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Fairfield, CT | Mennillo Plumbing, LLC | 79C365C553 | Apprenticeship Sponsor | Jun 30, 2027 |
| New London, CT | Mercado's Electrical Home Improvement | 71BA519C5A | Apprenticeship Sponsor | Jun 30, 2006 |
| Shelton, CT | Mercantile Development, Inc. | 543A18017F | Apprenticeship Sponsor | Jun 30, 2023 |
| Auburn, MA | Mercier Electric Company, Inc. | E8DD13B91C | Apprenticeship Sponsor | Jun 30, 2022 |
| Stratford, CT | Mercury Cabling Systems, LLC | C89516DD9C | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | Mercury Energy dba HOP Energy | A2E5A8F146 | Apprenticeship Sponsor | Jun 30, 2022 |
| Meriden, CT | Meriden Manufacturing, Inc. | 67280FE20C | Apprenticeship Sponsor | Jun 30, 2025 |
| Meriden, CT | Meriden Public Schools | 5713B57FF1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | Meriden-New Britain-Berlin YMCA | A0F15E17B2 | Apprenticeship Sponsor | Jun 30, 2026 |
| Trumbull, CT | Merkle Electric | 04DB94A6C7 | Apprenticeship Sponsor | Jun 30, 2006 |
| East Hartford, CT | Merrill Electrical Service, Inc. | 21E42BE0E2 | Apprenticeship Sponsor | Jun 30, 2020 |
| Hamden, CT | Mesner's General Services, LLC | CB488236A8 | Apprenticeship Sponsor | Jun 30, 2022 |
| Broad Brook, CT | Messenger Electrical & General Contracting | 866189FBEC | Apprenticeship Sponsor | Jun 30, 2006 |
| Thomaston, CT | Metallon, Inc. | AFFC202E2A | Apprenticeship Sponsor | Jun 30, 2026 |
| Ludlow, MA | Metras Electric, Inc. | C08BD198E0 | Apprenticeship Sponsor | Jun 30, 2011 |
| Farmington, CT | METRO CONSTRUCTION CORPORATION (THE) | 066908B7F0 | Major Contractor + 1 more | Jun 30, 2027 |
| Stamford, CT | Metro North RR | 5E10DEE739 | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | Metropolitan Plumbing Service, Inc. | D2F928059D | Apprenticeship Sponsor | Jun 30, 2005 |
| Norwalk, CT | Meza Electric Company, LLC | D972B4ABFA | Apprenticeship Sponsor | Jun 30, 2020 |
| Bristol, CT | MG Electric & Construction, Inc. | 128631026D | Apprenticeship Sponsor | Jun 30, 2026 |
| North Haven, CT | MGM Electric, Inc. | C7E54CD86A | Apprenticeship Sponsor | Jun 30, 2019 |
| Watertown, CT | MGT Electrical Services, Inc. | BE1DF641A7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Farmington, CT | Miceli Electric LLC | A1E4A0444D | Apprenticeship Sponsor | Jun 30, 2015 |
| Trumbull, CT | Michael A. Doran Plumbing & Heating | 7099F68BD5 | Apprenticeship Sponsor | Jun 30, 2007 |
| Stafford Springs, CT | Michael Angelo Electrical Contracting Co. | 6A4CB22672 | Apprenticeship Sponsor | Jun 30, 2011 |
| Amston, CT | MICHAEL BURRUANO PLUMBING & HEATING | 8EF943D004 | Apprenticeship Sponsor | Jun 30, 2027 |
| Greenwich, CT | Michael C. Weigold, Inc. | 6C00DCE29F | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | Michael Fazzino Plumbing & Heating, LLC | 4E566B208D | Apprenticeship Sponsor | Jun 30, 2019 |
| South Windsor, CT | Michael Finnegan Electrical Contracting Inc. Electrical Construction Corporation | 3B2511942F | Apprenticeship Sponsor | Jun 30, 2011 |
| Danbury, CT | Michael J. Barrett Plumbing & Heating, LLC | 6361D1D16C | Apprenticeship Sponsor | Jun 30, 2009 |
| Yalesville, CT | MICHAEL SHEEHY PLUMBING & HEATING, LLC | 6B7393BF6D | Apprenticeship Sponsor | Jun 30, 2027 |
| Sandy Hook, CT | MICHAEL TOBIN PLUMBING LLC | 76B5D7FA07 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Haddam, CT | Michael's Plumbing & Heating Co. | A67276E7B0 | Apprenticeship Sponsor | Jun 30, 2026 |
| Bristol, CT | MICHAUD ELECTRIC, INC. | 158B7AEB34 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | MICON DEVELOPMENT | 5229B9A3CF | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | Micon Electrical Contractors LLC | FEC1C7C76B | Apprenticeship Sponsor | Jun 30, 2011 |
| South Windham, CT | MICRO PRECISION, LLC | 885A38D4B8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Seymour, CT | Microboard Processing, Inc. | 93E521EF57 | Apprenticeship Sponsor | Jun 30, 2019 |
| Cheshire, CT | Microtech, Inc. | D9CB7D0519 | Apprenticeship Sponsor | Jun 30, 2020 |
| Middletown, CT | Mid-State Mechanical Contractors | FBD82DBEDA | Apprenticeship Sponsor | Jun 30, 2027 |
| Prospect, CT | Mid-State Teledata LLC | 7D5D861AF3 | Apprenticeship Sponsor | Jun 30, 2017 |
| Middlebury, CT | Middlebury Consignment LLC dba Take 5 Studio | 3605AD40A4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | Middlesex Electric, Inc. | A0366BA4CE | Apprenticeship Sponsor | Jun 30, 2013 |
| Middletown, CT | Middlesex Mechanical Services | 08E299D9E1 | Apprenticeship Sponsor | Jun 30, 2006 |
| Portland, CT | Middlesex Mechanical Services, LLC | C826C66F03 | Apprenticeship Sponsor | Jun 30, 2026 |
| Portland, CT | Middlesex Oil Service, LLC | 2EB1263485 | Apprenticeship Sponsor | Jun 30, 2008 |
| Middletown, CT | Middletown Plate Glass Co., Inc. | 7CFDBE76FE | Apprenticeship Sponsor | Jun 30, 2012 |
| West Hartford, CT | Midpoint Mechanical LLC | 696A7CCFDB | Apprenticeship Sponsor | Jun 30, 2009 |
| Meriden, CT | Midstate Medical Center | 5737110FB3 | Apprenticeship Sponsor | Jun 30, 2016 |
| Bloomfield, CT | MIDSTATE SITE DEVELOPMENT LLC | 698545E25C | Major Contractor + 1 more | Jun 30, 2027 |
| Ansonia, CT | Midwest Plastics Components, Inc. | 5636DE4BB2 | Apprenticeship Sponsor | Jun 30, 2010 |
| Milford, CT | Midwood Electrical Service, LLC | D97910DC23 | Apprenticeship Sponsor | Jun 30, 2010 |
| Waterbury, CT | Miele Electric/Power II LLC | 1284438118 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Britain, CT | Miele Mechanical Services, LLC | 466B0E3096 | Apprenticeship Sponsor | Jun 30, 2026 |
| Cheshire, CT | MIH SYSTEM GROUP, LLC | F32E269601 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | Mikco Manufacturing Technology Co., Inc. | 21E381E50A | Apprenticeship Sponsor | Jun 30, 2016 |
| Granby, CT | Mike Alleano Plumbing Services | E8FC485F44 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Mike Barrett Plumbing & Heating | 4E26A15EB1 | Apprenticeship Sponsor | Jun 30, 2023 |
| Lyme, CT | Mike Flynn Electric | B1762CEBCA | Apprenticeship Sponsor | Jun 30, 2007 |
Alphabetical order — this site ranks no one. Businesses with at least one active credential in the Connecticut eLicensing file of October 1, 2026. How to read this.