| 1 | Purmo Group (UK) LTD | Ireland | Letterkenny | Glencar Shopping Centre | Donegal | F92 PCH9 | N/A | 2022 | $94,050,465 | 387 | N/A | N/A | 909807 |
| 2 | Gaffney Mechanical LIMITED | Ireland | Dublin | 1 Grants Row Lower Mount Street | Dublin | D02 HX96 | N/A | 2011 | $92,554,947 | 194 | N/A | N/A | 506525 |
| 3 | Vestas Ireland LIMITED | Ireland | Swords | Skybridge House | Dublin | K67 P6K2 | N/A | 2008 | $55,502,913 | 103 | N/A | N/A | 459005 |
| 4 | Dominic O'connor LIMITED | Ireland | Loughrea | Eastpoint Business Park | Galway | N/A | doconnor.***** | 2002 | $46,989,915 | 99 | N/A | N/A | 359850 |
| 5 | Ideal Energy Distribution LIMITED | Ireland | Malahide | Ascot House | Dublin | K36 HH42 | N/A | 2019 | $32,489,663 | 16 | N/A | N/A | 652026 |
| 6 | Crystal Air LIMITED | Ireland | Naas | Unit 3 Butterstream Business Park Co. Kildare | Kildare | W91 VK31 | crystalair.***** | 2014 | $31,360,900 | 123 | N/A | N/A | 547631 |
| 7 | Kerrigan Mechanical LIMITED | Ireland | Navan | Unit 2 Athboy Business Park | Meath | C15 W13H | lidl.***** | 1998 | $29,785,435 | 63 | N/A | N/A | 285629 |
| 8 | Mecpro Engineering LIMITED | Ireland | Dundalk | Derrycannagh | Louth | N/A | N/A | 2011 | $27,072,685 | 25 | N/A | N/A | 499042 |
| 9 | Automated Technical Controls LIMITED | Ireland | Dublin 24 | Atc House | Dublin | D24 EF99 | atc.***** | 1991 | $23,393,674 | 37 | N/A | N/A | 166907 |
| 10 | Sse Airtricity Energy Services LIMITED | Ireland | Dublin | South County Business Park | Dublin | N/A | N/A | 2009 | $20,238,226 | 31 | N/A | N/A | 476708 |
| 11 | T. Bourke & CO. LIMITED | Ireland | Blackrock | T22 Stillorgan Industrial Park | Dublin | A94 FX96 | tbourke.***** | 1972 | $19,126,934 | 80 | N/A | N/A | 39174 |
| 12 | Budget Energy LIMITED | Ireland | Dublin | Building 2, 3rd & 4th Floor, the Green, Dublin Airport Central | Dublin | K67 E2H3 | N/A | 2011 | $11,459,139 | 2 | N/A | N/A | 496678 |
| 13 | Lenmac Mechanical Services LIMITED | Ireland | Limerick | T/a Sensoryfm | Limerick | V94 3D71 | lenmacservices.***** | 1988 | $11,320,306 | 86 | N/A | N/A | 136082 |
| 14 | MR. Vent LIMITED | Ireland | Dublin 12 | Unit 5, Park West Drive | Dublin | D12 A720 | q-nis.***** | 2011 | $8,958,142 | 25 | N/A | N/A | 499705 |
| 15 | Cross Hire LIMITED | Ireland | Cork | Old Mallow Road | Cork | T23 XC60 | ireservices.***** | 2006 | $6,691,784 | 25 | N/A | N/A | 416031 |
| 16 | Mastertherm Heat Pumps LIMITED | Ireland | Dublin | Unit 46 | Dublin | N/A | N/A | 2017 | $5,388,729 | 2 | N/A | N/A | 605218 |
| 17 | Radco Distribution Ireland LIMITED | Ireland | Dublin 24 | Unit 1c Broomhill Business Complex Broomhill Road | Dublin | N/A | N/A | 2001 | $3,164,175 | 39 | N/A | N/A | 350204 |
| 18 | Laurence Mechanical Services LIMITED | Ireland | Cavan | Ballinagh Road | Cavan | H12 XE44 | N/A | 1992 | $3,164,175 | 33 | N/A | N/A | 190082 |
| 19 | Haus- Und Gebaeudetechnik LIMITED | Ireland | Dublin | Kandoy House 2 Fairview Strand | Dublin | D03Y1E2 | N/A | 2023 | $3,164,175 | 25 | N/A | N/A | 752760 |
| 20 | Viridus Energy LIMITED | Ireland | Ranelagh | 4 Manders Terrace | West Meath | N/A | N/A | 2023 | $3,164,175 | 25 | N/A | N/A | 735660 |
| 21 | Hydraulic Hose Services LIMITED | Ireland | Dublin | Pirtek Dublin | Dublin | D24HKF7 | pirtek.***** | 2006 | $2,391,993 | 12 | N/A | N/A | 421872 |
| 22 | A&B Mechanical Homes LIMITED | Ireland | Malahide | Block A Apartment 107 | Dublin | K36 FD80 | N/A | 2022 | $1,294,672 | 15 | N/A | N/A | 712346 |
| 23 | Heatgen Installations LIMITED | Ireland | Monaghan | Scotstown Business Centre | Monaghan | H18 R960 | N/A | 2024 | $885,969 | 7 | N/A | N/A | 767010 |
| 24 | Dmr Engineering LIMITED | Ireland | Dublin | Unit 21 (d3) Bymac Centre Northwest Business Park | Dublin | D15W027 | N/A | 2013 | $670,661 | 4 | N/A | N/A | 535182 |
| 25 | Ashgrove Engineering LIMITED | Ireland | Mallow | Ida Business & Technology Park | Cork | P51 HY51 | ashgrove.***** | 2001 | $632,835 | 100 | N/A | N/A | 409960 |
| 26 | Tim Kelly Mechanical LIMITED | Ireland | Ballinrobe | Claremorris Road | Mayo | F31 RW66 | timkellyengineering.***** | 1979 | $632,835 | 66 | N/A | N/A | 67961 |
| 27 | Rilta Environmental LIMITED | Ireland | Portlaoise | Enva Ireland | Laois | R32 XD95 | N/A | 2003 | $632,835 | 61 | N/A | N/A | 374837 |
| 28 | Ardrar Holdings LIMITED | Ireland | Dublin | 1 Warrington Place | Dublin | N/A | N/A | 2018 | $632,835 | 59 | N/A | N/A | 632290 |
| 29 | Alpha Mechanical Services LIMITED | Ireland | Dublin | Unit 8 Willsborough Business Centre | Dublin | D17 | N/A | 2013 | $632,835 | 57 | N/A | N/A | 534907 |
| 30 | Mcgrattan & Kenny LIMITED | Ireland | Dublin | North City Business Park | Dublin | D11 PH30 | mcgk.***** | 1968 | $632,835 | 56 | N/A | N/A | 26508 |
| 31 | Riverside Mechanical LIMITED | Ireland | Dublin | Unit A6 Centrepoint | Dublin | D11 Y727 | riverside-mechanical.***** | 2005 | $632,835 | 49 | N/A | N/A | 397896 |
| 32 | Kcmg Engineering LIMITED | Ireland | Naas | 10 Glen Easton Grove | Kildare | W23 DK72 | N/A | 2017 | $632,835 | 44 | N/A | N/A | 610069 |
| 33 | Kingmek LIMITED | Ireland | Gormanstown | Irishtown | North Tipperary | N/A | N/A | 2003 | $632,835 | 39 | N/A | N/A | 373827 |
| 34 | Architectural Steel & Mechanical Services LIMITED | Ireland | Cork | Waterfront Apartments | Cork | T45 FT28 | N/A | 2006 | $632,835 | 39 | N/A | N/A | 413884 |
| 35 | Lowflo LIMITED | Ireland | Dublin | Unit 4 Colberts Fort Business Park | Dublin | D24 PD29 | lowflo.***** | 2013 | $632,835 | 35 | N/A | N/A | 535360 |
| 36 | Walsh Mechanical Engineering LIMITED | Ireland | Ballinrobe | Kilmaine Road | Mayo | F31 R299 | wme.***** | 1986 | $632,835 | 31 | N/A | N/A | 105639 |
| 37 | G. M. G. Mechanical Services LIMITED | Ireland | Donegal | Lacklum | Donegal | N/A | gmg.***** | 1998 | $632,835 | 29 | N/A | N/A | 295340 |
| 38 | Walsh & Sheehan LIMITED | Ireland | Waterford | Unit 25 West Side Business Park | Waterford | N/A | walshandsheehan.***** | 2005 | $632,835 | 29 | N/A | N/A | 412794 |
| 39 | D. Harris (heating And Plumbing) LIMITED | Ireland | Dublin | Unit 11a Santry Business Park | Dublin | D09 T9C4 | harrisheating.***** | 1981 | $632,835 | 29 | N/A | N/A | 82051 |
| 40 | Feakle Gas And Plumbing LIMITED | Ireland | Feakle | Derrynaneal | Limerick | V94 2X89 | N/A | 2017 | $632,835 | 28 | N/A | N/A | 604804 |
| 41 | Learnd Ireland Services LIMITED | Ireland | Dublin | Bracetown Business Park | Dublin | DUBLIN | N/A | 2019 | $632,835 | 26 | N/A | N/A | 657407 |
| 42 | Clare Drains Environmental LIMITED | Ireland | Ennis | Unit 10 Quin Road Business Park | Clare | V95 VW74 | claredrains.***** | 2011 | $632,835 | 25 | N/A | N/A | 495366 |
| 43 | Alert Mechanical LIMITED | Ireland | Dundalk | Stephenstown | Louth | A91 VXE2 | N/A | 2007 | $632,835 | 25 | N/A | N/A | 449298 |
| 44 | Kibo Ireland LIMITED | Ireland | Tullamore | Clara Road | Offaly | N/A | autelco.***** | 2003 | $632,835 | 23 | N/A | N/A | 369341 |
| 45 | Navio LIMITED | Ireland | Dublin | Cube House Unit 1 | Dublin | D15 NYH4 | N/A | 2020 | $632,835 | 22 | N/A | N/A | 681041 |
| 46 | Lacey's Plumbing And Heating Supplies LIMITED | Ireland | Dublin 11 | 118 Millennium Trade Park | Dublin | D11WK12 | laceys.***** | 2015 | $632,835 | 21 | N/A | N/A | 559751 |
| 47 | Killarney Mechanical Services LIMITED | Ireland | Killarney | Meanus | Kerry | V93 C6H2 | kmsservices.***** | 1996 | $632,835 | 20 | N/A | N/A | 250720 |
| 48 | Rel Cooling Services LIMITED | Ireland | Carlow | Carlow Enterprise Centre | Carlow | N/A | rel.***** | 2012 | $632,835 | 18 | N/A | N/A | 515495 |
| 49 | Bartech Engineering LIMITED | Ireland | Dublin 11 | 278 Glasnevin Avenue | Dublin | D11PW2T | N/A | 2014 | $632,835 | 17 | N/A | N/A | 545947 |
| 50 | Kearney & Phelan Engineering LIMITED | Ireland | Castlecomer | 51 the Acorns Upper | Kilkenny | N/A | N/A | 2012 | $632,835 | 17 | N/A | N/A | 513398 |
| 51 | Celsius Mechanical LIMITED | Ireland | Celbridge | 54 Daracourt | Kildare | N/A | celsius.***** | 2004 | $632,835 | 16 | N/A | N/A | 387549 |
| 52 | Dan Moran LIMITED | Ireland | Ennis | Gort Road | Clare | N/A | N/A | 1970 | $632,835 | 15 | N/A | N/A | 30728 |
| 53 | Whitemore Mechanical LIMITED | Ireland | Limerick | One Acre | Limerick | N/A | N/A | 2015 | $632,835 | 14 | N/A | N/A | 569516 |
| 54 | Michael Sammon & CO. LIMITED | Ireland | Newbridge | 3 Ryston Close | Kildare | W12 WY01 | micksammonheatingandplumbing.***** | 1983 | $632,835 | 14 | N/A | N/A | 91325 |
| 55 | Plumbnation LIMITED | Ireland | Cork | Unit 2 | Cork | N/A | N/A | 2017 | $632,835 | 12 | N/A | N/A | 618041 |
| 56 | John Lawlor Plumbing & Heating LIMITED | Ireland | Carlow | Ballyhide | Carlow | N/A | N/A | 2015 | $632,835 | 12 | N/A | N/A | 570319 |
| 57 | Dleech Plumbing LIMITED | Ireland | Dublin | 1 Castletimon Park, Kilmore | Dublin | D05 DX99 | N/A | 2014 | $632,835 | 12 | N/A | N/A | 553368 |
| 58 | Pillinger Of Ireland LIMITED | Ireland | Cork | Unit 13 Westlink Business Park Doughcloyne Industrial Estate | Cork | T12KW27 | pillinger.***** | 1945 | $632,835 | 11 | N/A | N/A | 87961 |
| 59 | P.J. Mullane Heating & Plumbing LIMITED | Ireland | Tramore | 52 the Croft Clarinwood | Waterford | X91A8R6 | N/A | 2005 | $632,835 | 11 | N/A | N/A | 397815 |
| 60 | Cathal Conlon & Company LIMITED | Ireland | Cork | 9a Ballinure Cottages | Cork | T12 Y592 | cathalconlon.***** | 1973 | $632,835 | 9 | N/A | N/A | 40699 |
| 61 | Almar Heating Technologies LIMITED | Ireland | Longford | Millennium House | Longford | N/A | N/A | 2017 | $632,835 | 9 | N/A | N/A | 603778 |
| 62 | Biocycle LIMITED | Ireland | Dublin | Unit 106 | Dublin | D13 A0D0 | biocycle.***** | 1989 | $632,835 | 8 | N/A | N/A | 148490 |
| 63 | Polytherm Heating Systems LIMITED | Ireland | Swords | Muirfield Drive Naas Road | Dublin | D12 X0A3 | polytherm.***** | 1999 | $632,835 | 8 | N/A | N/A | 303306 |
| 64 | Lake County Plumbing & Heating LIMITED | Ireland | Mullingar | Mullingar Business Park, Unit 12b | West Meath | N/A | N/A | 2011 | $632,835 | 7 | N/A | N/A | 507815 |
| 65 | Geaney Oil LIMITED | Ireland | Ardfert | Commons North | Kerry | N/A | N/A | 1993 | $632,835 | 7 | N/A | N/A | 206747 |
| 66 | Ah Commercial Energy Solutions Ireland LIMITED | Ireland | Dundalk | Unit 1, Ground Floor,oriel Hub | Louth | A91 PP6Y | N/A | 2018 | $632,835 | 7 | N/A | N/A | 636577 |
| 67 | Advance Gas Systems LIMITED | Ireland | Clonmel | Unit 12g Ard Gaoithe Business Park | North Tipperary | E91 FX21 | agsl.***** | 2015 | $632,835 | 6 | N/A | N/A | 563443 |
| 68 | Integral Mechanical Services Contracting LIMITED | Ireland | Cobh | Mount David | Cork | N/A | N/A | 2009 | $632,835 | 5 | N/A | N/A | 466365 |
| 69 | Bcd Plumbing LIMITED | Ireland | Cavan | Provincial House, Farnham Street | Cavan | N/A | N/A | 1998 | $632,835 | 5 | N/A | N/A | 294181 |
| 70 | Whelan Refridgeration LIMITED | Ireland | Fossa | C/o Tony Whelan | Kerry | V93NY02 | N/A | 2008 | $632,835 | 5 | N/A | N/A | 461048 |
| 71 | Bill Coady Enterprises LIMITED | Ireland | Ninemilehouse | Grange Road | North Tipperary | N/A | N/A | 2009 | $632,835 | 5 | N/A | N/A | 472991 |
| 72 | Tas Mechanical LIMITED | Ireland | Drogheda | 2 the Maples | Louth | A92VP11 | N/A | 2018 | $632,835 | 5 | N/A | N/A | 635715 |
| 73 | C H I South West LTD | Ireland | Lifford | C/o Mcguinness | Donegal | F93 KW10 | N/A | 2025 | $632,835 | 5 | N/A | N/A | 910414 |
| 74 | Oml Ventilation LIMITED | Ireland | Cork | Doughcloyne Court Industrial Estate | Cork | T12 C780 | N/A | 2014 | $632,835 | 5 | N/A | N/A | 537511 |
| 75 | Rts Heating And Cooling Services LIMITED | Ireland | Dublin | 1 Grants Row | Dublin | D02 | N/A | 2018 | $632,835 | 5 | N/A | N/A | 639896 |
| 76 | Mep Prefab Ireland LIMITED | Ireland | Dundalk | Drumleck Stores | Louth | A91 W7CN | N/A | 2023 | $632,835 | 5 | N/A | N/A | 735892 |
| 77 | Obrien Air LIMITED | Ireland | Bray | 8 Arbutus Grove | Wicklow | A98 FY28 | N/A | 2024 | $632,835 | 5 | N/A | N/A | 762317 |
| 78 | Kerrmech Heating Solution LIMITED | Ireland | Carrickmacross | Drumlusty | Monaghan | N/A | N/A | 2017 | $632,835 | 5 | N/A | N/A | 608691 |
| 79 | Solarstream Holdings LIMITED | Ireland | Carlow | Enterprise House | Carlow | R93 Y0Y3 | N/A | 2022 | $632,835 | 5 | N/A | N/A | 727288 |
| 80 | Slix LIMITED | Ireland | Mullingar | Cappagh | West Meath | N91 WF51 | N/A | 2024 | $632,835 | 5 | N/A | N/A | 759629 |
| 81 | Easy Heat LIMITED | Ireland | Dublin 8 | 134 Dargan Building Military Road | Dublin | N/A | N/A | 2018 | $632,835 | 5 | N/A | N/A | 634822 |
| 82 | Exi-Tite Ireland LIMITED | Ireland | Carlow | Office | Carlow | R93 R2X7 | exi-tite.***** | 2020 | $632,835 | 5 | N/A | N/A | 663641 |
| 83 | Entropic Hvac Service LIMITED | Ireland | Maynooth | Unit 3, Block F | Kildare | N/A | entropic.***** | 2018 | $632,835 | 5 | N/A | N/A | 636028 |
| 84 | Drain IT LIMITED | Ireland | Dublin | 42 Foxhill Avenue | Dublin | D13 | N/A | 2006 | $632,835 | 5 | N/A | N/A | 424444 |
| 85 | David Lovell Plumbing & Heating Contractor LIMITED | Ireland | Clonakilty | Knockskeagh | Cork | P85 AV90 | lovellplumbingandheating.***** | 2003 | $632,835 | 5 | N/A | N/A | 371842 |
| 86 | Gaia Smart Energy (ireland) LIMITED | Ireland | Dublin | 44 Ely Woods | Dublin | D16 F5X6 | N/A | 2021 | $632,835 | 5 | N/A | N/A | 699407 |
| 87 | Macmech Air LIMITED | Ireland | Dublin | Unit A | Dublin | N/A | N/A | 2023 | $632,835 | 5 | N/A | N/A | 732576 |
| 88 | Solar Dynamix Installations Ireland LIMITED | Ireland | Cork | Lee View House | Cork | T12 T0CT | N/A | 2024 | $632,835 | 5 | N/A | N/A | 764973 |
| 89 | C Kelly Plumbing & Mechanical Services LIMITED | Ireland | Cavan | Erne Business Park, Unit 1 | Cavan | H14 R856 | N/A | 2021 | $632,835 | 5 | N/A | N/A | 693345 |
| 90 | Tubbercurry Engineering & Services LIMITED | Ireland | Roscommon | Ida Business Park | Roscommon | N/A | tesg.***** | 1979 | $632,835 | 5 | N/A | N/A | 66774 |
| 91 | Geoff Castles Boiler Services LIMITED | Ireland | Quartertown Mills | Unit A Euro Business Park Quartertown Industrial Estate | Cork | P51AT26 | N/A | 1995 | $632,835 | 5 | N/A | N/A | 907685 |
| 92 | Krr (UK) LIMITED | Ireland | Dublin | The Black Church | Dublin | D07 P4AX | N/A | 2025 | $632,835 | 5 | N/A | N/A | 910324 |
| 93 | Chx Consulting LIMITED | Ireland | Roscommon | Cloonfad West | Roscommon | F35 C995 | N/A | 2024 | $632,835 | 5 | N/A | N/A | 759359 |
| 94 | Mc Guinness Mechanical Engineering LIMITED | Ireland | Donabate | Unit 18 | Dublin | N/A | N/A | 2021 | $632,835 | 5 | N/A | N/A | 695496 |
| 95 | Maynooth Plumbing & Heating LIMITED | Ireland | Maynooth | Old Greenfields | Kildare | N/A | maynoothplumbingandheating.***** | 2019 | $632,835 | 5 | N/A | N/A | 654733 |
| 96 | Midland Renewables LIMITED | Ireland | Athboy | Unit 3 | Meath | N/A | lidl.***** | 2012 | $632,835 | 5 | N/A | N/A | 514366 |
| 97 | Dlr Gas LIMITED | Ireland | Claremorris | 21 Beechpark | Mayo | F12 R5D3 | N/A | 2022 | $632,835 | 5 | N/A | N/A | 718983 |
| 98 | Plumbland LIMITED | Ireland | Leixlip | Thomas P Fox & Company, Leixlip Centre | Kildare | N/A | N/A | 1991 | $632,835 | 5 | N/A | N/A | 175640 |
| 99 | Sph Plumbing & Heating LTD. | Ireland | Monaghan | Corrinshigo | Monaghan | N/A | N/A | 2023 | $632,835 | 5 | N/A | N/A | 910100 |
| 100 | Fusion Mechanical Services LIMITED | Ireland | Dublin | The Black Church | Dublin | D0 | N/A | 2018 | $632,835 | 5 | N/A | N/A | 622303 |