| 1 | Apple Operations International LIMITED | Ireland | Cork | Hollyhill Industrial Estate | Cork | N/A | apple.***** | 1980 | $222,303,000,000 | 55,827 | N/A | N/A | 76941 |
| 2 | Apple Sales International LIMITED | Ireland | Cork | Hollyhill Industrial Estate, Hollyhill | Cork | N/A | N/A | 1990 | $218,894,000,000 | 56,922 | N/A | N/A | 157192 |
| 3 | Crh Public LIMITED Company | Ireland | Rathfarnham | Stonemason S Way | Dublin | D16 KH51 | crh.***** | 1970 | $35,572,000,000 | 79,770 | N/A | N/A | 12965 |
| 4 | Linde Public LIMITED Company | Ireland | Dublin | Ten | Dublin | N/A | N/A | 2017 | $32,854,000,000 | 66,323 | N/A | N/A | 606357 |
| 5 | Nutricia Infant Nutrition LIMITED | Ireland | Dublin 24 | 70 Sir John Rogerson'S Quay | Dublin | D02R296 | nutricia.***** | 2004 | $27,933,744,220 | 102,449 | N/A | N/A | 384474 |
| 6 | Crh North America LIMITED | Ireland | Dublin | 42 Fitzwilliam Square West | Dublin | D02 R279 | N/A | 1974 | $24,002,608,119 | 79,560 | N/A | N/A | 47622 |
| 7 | Diageo PLC | Ireland | Dublin | Guinness Storehouse St. James'S Gate | Dublin | D08 AX97 | N/A | 1923 | $19,418,497,496 | 27,987 | N/A | N/A | 900038 |
| 8 | Glaxosmithkline Trading Services LIMITED | Ireland | Dublin | 12 River Walk | Dublin | D24 | N/A | 2005 | $17,532,346,304 | 100 | N/A | N/A | 406446 |
| 9 | Crh Group Services LIMITED | Ireland | Dublin | Stonemason'S Way | Dublin | D16 KH51 | crh.***** | 1968 | $16,943,249,180 | 66,466 | N/A | N/A | 26948 |
| 10 | Cencora Global Procurement LIMITED | Ireland | Cork | 8 Eastgate Avenue | Cork | N/A | N/A | 2022 | $16,647,781,553 | 7 | N/A | N/A | 728560 |
| 11 | Swords Laboratories Unlimited Company | Ireland | Swords | Watery Lane | Dublin | K67 AY91 | bms.***** | 1977 | $15,524,505,000 | 1,120 | N/A | N/A | 60709 |
| 12 | Roadstone LIMITED | Ireland | Tallaght | Fortunestown | Dublin | N/A | roadstone.***** | 1944 | $12,416,303,320 | 54,239 | N/A | N/A | 11035 |
| 13 | Roadstone Provinces LIMITED | Ireland | Saggart | Naas Road | Dublin | N/A | roadstonewood.***** | 1945 | $12,416,303,320 | 54,239 | N/A | N/A | 11228 |
| 14 | Janssen Sciences Ireland Unlimited Company | Ireland | Dublin 24 | Airton Road | Dublin | D24 WR89 | its.***** | 1953 | $11,786,500,158 | 1,023 | N/A | N/A | 472372 |
| 15 | Peninsula Petroleum LIMITED | Ireland | Dublin 24 | Central Quay,second Floor, Block B | Dublin | D02 RR77 | N/A | 1996 | $9,556,428,000 | 475 | N/A | N/A | 378557 |
| 16 | Smurfit Kappa Investments LIMITED | Ireland | Dublin 4 | C/o Smurfit Kappa Group Beech Hill | Dublin | N/A | N/A | 2004 | $9,008,905,353 | 42,259 | N/A | N/A | 380620 |
| 17 | Analog Devices International Unlimited Company | Ireland | Limerick | Raheen Industrial Estate | Limerick | V94 N4V2 | N/A | 2012 | $8,550,114,000 | 1,757 | N/A | N/A | 519435 |
| 18 | Kerry Group Public LIMITED Company | Ireland | Tralee | Prince'S Street | Kerry | V92 EH11 | kerrygroup.***** | 1985 | $7,327,578,683 | 21,647 | N/A | N/A | 111471 |
| 19 | Howmedica International S. De R.L. | Ireland | Limerick | Cloughkeating Business Park | Limerick | V94 X6T4 | stryker.***** | 1971 | $7,320,000,000 | 20,036 | N/A | N/A | 901582 |
| 20 | European Refreshments Unlimited Company | Ireland | Drogheda | Southgate | Louth | A92 YK7W | N/A | 2005 | $6,701,561,003 | 930 | N/A | N/A | 403110 |
| 21 | Gilead Sciences Ireland Unlimited Company | Ireland | Carrigtwohill | Ida Business & Technology Park | Cork | N/A | gilead.***** | 1997 | $6,550,991,000 | 631 | N/A | N/A | 259755 |
| 22 | Alexion Pharma International Operations LIMITED | Ireland | Dublin | College Business & Technology Park | Dublin | D15 R925 | astrazeneca.***** | 2013 | $6,003,050,000 | 1,037 | N/A | N/A | 528478 |
| 23 | Microchip Technology Ireland LIMITED | Ireland | Dublin | Ground Floor Block W | Dublin | D03 Y564 | N/A | 2004 | $5,301,414,000 | 593 | N/A | N/A | 381811 |
| 24 | Allergan Pharmaceuticals Ireland Unlimited Company | Ireland | Westport | Castlebar Road | Mayo | F28 AW83 | allergan.***** | 2012 | $5,238,041,000 | 1,533 | N/A | N/A | 514125 |
| 25 | Portfolio Concentrate Solutions Unlimited Company | Ireland | Dublin | 70 Sir John Rogerson S Quay | Dublin | D02R296 | N/A | 1965 | $4,902,081,000 | 1,445 | N/A | N/A | 609414 |
| 26 | Allergan Pharmaceuticals International LIMITED | Ireland | Dublin 17 | Clonshaugh Business & Technology Park | Dublin | D17 E400 | allergan.***** | 2000 | $4,521,599,000 | 528 | N/A | N/A | 334821 |
| 27 | Perrigo Company Public LIMITED Company | Ireland | Dublin | 10-12 Hogan Place | Dublin | D02 TY74 | perrigo.***** | 2013 | $4,373,400,000 | 8,646 | N/A | N/A | 529592 |
| 28 | Allergan Unlimited Company | Ireland | Coolock | Clonshaugh Business & Technology Park | Dublin | D17 E400 | allergan.***** | 2013 | $4,211,321,812 | 17,254 | N/A | N/A | 527629 |
| 29 | Jazz Pharmaceuticals Public LIMITED Company | Ireland | Dublin | Waterloo Exchange | Dublin | N/A | jazzpharma.***** | 2003 | $4,068,950,000 | 2,883 | N/A | N/A | 399192 |
| 30 | Nutricia Ireland LIMITED | Ireland | Dublin | Block 1, Deansgrange Business Park | Dublin | IRELAND | N/A | 1985 | $3,944,583,991 | 29,606 | N/A | N/A | 106997 |
| 31 | James Hardie Industries Public LIMITED Company | Ireland | Dublin | Corporate Headquarters | Dublin | D02 WR20 | N/A | 2010 | $3,936,300,000 | 5,679 | N/A | N/A | 485719 |
| 32 | Glanbia Public LIMITED Company | Ireland | Kilkenny | Legal Department Glanbis House | Kilkenny | R95 E866 | glanbia.***** | 1988 | $3,839,700,000 | 5,115 | N/A | N/A | 129933 |
| 33 | Trinseo Public LIMITED Company | Ireland | Dublin | Riverside One | Dublin | D02 X576 | N/A | 2015 | $3,513,200,000 | 3,026 | N/A | N/A | 562693 |
| 34 | Certa Ireland LIMITED | Ireland | Portlaoise | C/o Certa Ireland Limited | Laois | N/A | N/A | 1986 | $3,361,118,633 | 4,441 | N/A | N/A | 118120 |
| 35 | Bausch Health Ireland LIMITED | Ireland | Dublin | Citywest Business Campus | Dublin | D24 PPT3 | bauschhealth.***** | 2012 | $2,857,530,000 | 100 | N/A | N/A | 513130 |
| 36 | Ornua Co-Operative LIMITED | Ireland | Dublin | Grattan House | Dublin | N/A | N/A | 1961 | $2,771,456,722 | 2,423 | N/A | N/A | 0003221R |
| 37 | Tirlán LIMITED | Ireland | Dublin 24 | 3090-3094 Lake Drive | Dublin | D24 XN47 | N/A | 1900 | $2,764,944,437 | 2,315 | N/A | N/A | 501098 |
| 38 | Kellogg Europe Trading LIMITED | Ireland | Dublin | 3 Dublin Airport Central (dac) | Dublin | K67 X4X5 | kelloggs.***** | 2004 | $2,614,579,391 | 294 | N/A | N/A | 387390 |
| 39 | An Bord Bainne Management LIMITED | Ireland | Dublin | Grattan House | Dublin | N/A | N/A | 1978 | $2,463,328,780 | 3,133 | N/A | N/A | 63380 |
| 40 | Mylan Ireland LIMITED | Ireland | Dublin | Legal Department | Dublin | N/A | N/A | 2011 | $2,362,672,775 | 171 | N/A | N/A | 499501 |
| 41 | Biomarin International LIMITED | Ireland | Cork | Legal Department | Cork | P43 R298 | N/A | 2011 | $2,195,743,000 | 596 | N/A | N/A | 500060 |
| 42 | Horizon Therapeutics Ireland Designated Activity Company | Ireland | Dublin 24 | 70 Saint Stephen'S Green | Dublin | D02 E2X4 | horizontherapeutics.***** | 2003 | $2,128,991,000 | 528 | N/A | N/A | 376554 |
| 43 | Greencore Group Public LIMITED Company | Ireland | Dublin | 2 Northwood Avenue | Dublin | D09 X5N9 | greencore.***** | 1991 | $2,017,791,596 | 13,429 | N/A | N/A | 170116 |
| 44 | Astellas Ireland CO., LIMITED | Ireland | Dublin | Damastown Industrial Park | Dublin | D15 K851 | astellas.***** | 1986 | $2,015,637,041 | 3,358 | N/A | N/A | 111917 |
| 45 | Lakeland Dairies Co-Operative Society LIMITED | Ireland | Cavan | Dublin Road | Cavan | H12 NP74 | lakeland.***** | 1990 | $1,975,161,557 | 1,264 | N/A | N/A | 5942R |
| 46 | Jazz Pharmaceuticals Ireland LIMITED | Ireland | Dublin 4 | Waterloo Exchange | Dublin | D04 E5W7 | jazzpharma.***** | 2006 | $1,953,850,000 | 194 | N/A | N/A | 429847 |
| 47 | Genzyme Ireland LIMITED | Ireland | Waterford | Unit 701 Ida Industrial Park | Waterford | X91 TP27 | genzyme.***** | 1999 | $1,945,335,694 | 905 | N/A | N/A | 316537 |
| 48 | Sse Airtricity LIMITED | Ireland | Dublin | South County Business Park | Dublin | D18 W688 | N/A | 1999 | $1,852,335,539 | 545 | N/A | N/A | 317386 |
| 49 | Boston Scientific LIMITED | Ireland | Galway | Ballybrit Business Park | Galway | H91 Y868 | jobs.***** | 1994 | $1,746,710,000 | 6,817 | N/A | N/A | 213232 |
| 50 | Aptiv Global Operations LIMITED | Ireland | Dublin | 5 Hanover Quay | Dublin | D02 VY79 | N/A | 2015 | $1,726,605,129 | 262 | N/A | N/A | 574123 |
| 51 | Depuy Ireland Unlimited Company | Ireland | Cork | Togher Industrial Estate | Cork | N/A | N/A | 1997 | $1,725,784,944 | 1,106 | N/A | N/A | 263572 |
| 52 | Riot Games LIMITED | Ireland | Dublin | The Blood Stone Building | Dublin | D02 KF24 | riotgames.***** | 2010 | $1,682,248,155 | 175 | N/A | N/A | 483483 |
| 53 | Alkermes Public LIMITED Company | Ireland | Dublin | Connaught House | Dublin | D04 C5Y6 | N/A | 2011 | $1,663,405,000 | 2,209 | N/A | N/A | 498284 |
| 54 | Batchelors Unlimited Company | Ireland | Dublin | 72/74 Bannow Road | Dublin | D07 XR71 | fusio.***** | 1935 | $1,611,196,449 | 240 | N/A | N/A | 9032 |
| 55 | Origin Secretarial LIMITED | Ireland | Dublin | 4-6 Riverwalk Citywest Business Campus | Dublin | D24DCW0 | N/A | 1899 | $1,541,478,906 | 3,093 | N/A | N/A | 2334 |
| 56 | Cadence Design Systems (ireland) LIMITED | Ireland | Dublin 3 | Block S East Point Business Park | Dublin | N/A | cadence.***** | 1999 | $1,541,046,000 | 652 | N/A | N/A | 310821 |
| 57 | Johnson & Johnson Vision Care Ireland Unlimited Company | Ireland | Limerick | The National Technological Park | Limerick | V94 H97W | N/A | 1994 | $1,472,190,261 | 1,692 | N/A | N/A | 210174 |
| 58 | Kingston Digital International LIMITED | Ireland | Dublin | Stratus House, College and Business Technology Park | Dublin | D15 PEC4 | kingston.***** | 2009 | $1,431,855,000 | 193 | N/A | N/A | 470596 |
| 59 | Sazerac Of Ireland Unlimited Company | Ireland | Dublin | 21 Gilford Road | Dublin | D04H668 | N/A | 2016 | $1,363,851,057 | 745 | N/A | N/A | 584838 |
| 60 | Dairygold Co-Operative Society LTD | Ireland | Mitchelstown | Clonmel Road | Cork | P67 DD36 | dairygold.***** | 1919 | $1,323,507,115 | 1,270 | N/A | N/A | N/A |
| 61 | C. & J. Clark International LIMITED | Ireland | Dublin | Building 1 Swift Square | Dublin | DO9 A0E4 | N/A | 1991 | $1,229,312,160 | 11,396 | N/A | N/A | 903113 |
| 62 | Trane Technologies International LIMITED | Ireland | Swords | Units 170/175 Lake View Drive | Dublin | K67 EW96 | N/A | 2001 | $1,173,009,138 | 537 | N/A | N/A | 349511 |
| 63 | Titanium LIMITED | Ireland | Dublin | Unit 62-63 Stillorgan Indstl Pk | Dublin | N/A | N/A | 1993 | $1,153,510,358 | 4,704 | N/A | N/A | 198085 |
| 64 | Shannon Engine Support LIMITED | Ireland | Shannon | 4000 Atlantic Avenue | Clare | V14 YX01 | N/A | 1988 | $1,054,749,000 | 75 | N/A | N/A | 130807 |
| 65 | Smurfit Westrock Security Concepts LIMITED | Ireland | Bray | Pinewood Close | Wicklow | A98 YP04 | N/A | 1980 | $1,044,552,905 | 6,516 | N/A | N/A | 69447 |
| 66 | Vmware International Marketing LIMITED | Ireland | Dublin 24 | 70 Sir John Rogerson'S Quay | Dublin | D02R296 | N/A | 2008 | $993,529,000 | 3,937 | N/A | N/A | 454020 |
| 67 | Alkermes Pharma Ireland LIMITED | Ireland | Dublin 4 | Connaught House | Dublin | D04 C5Y6 | alkermes.***** | 2007 | $988,700,000 | 216 | N/A | N/A | 448848 |
| 68 | Nypro LIMITED | Ireland | Bray | Corke Abbey | Dublin | N/A | nypro.***** | 1980 | $985,853,161 | 1,069 | N/A | N/A | 79512 |
| 69 | Monster Energy LIMITED | Ireland | Dublin 4 | 6th Floor South Bank House | Dublin | D04TR29 | N/A | 2008 | $952,532,326 | 72 | N/A | N/A | 462494 |
| 70 | Cook Medical EMEA Group LIMITED | Ireland | Limerick | O'Halloran Road | Limerick | N/A | cookmedical.***** | 2019 | $898,492,392 | 2,191 | N/A | N/A | 662346 |
| 71 | Asml Ireland LIMITED | Ireland | Dublin | C/o Tmf Group Ground Floor, | Dublin | D01 K2C5 | N/A | 2001 | $897,226,131 | 156 | N/A | N/A | 351144 |
| 72 | Anglo Beef Processors Ireland Unlimited Company | Ireland | Ardee | John Street | Louth | A92 C92H | abpfoodgroup.***** | 1954 | $892,750,898 | 50 | N/A | N/A | 217122 |
| 73 | Dairygold LIMITED | Ireland | Cork | Cork Airport Business Park Building 5100 | Cork | N/A | dairygold.***** | 1987 | $876,351,491 | 1,500 | N/A | N/A | 127365 |
| 74 | Transitions Optical LIMITED | Ireland | Tuam | Dunmore Road Industrial Estate | Galway | H54 NX39 | transitions.***** | 1993 | $845,530,953 | 231 | N/A | N/A | 210033 |
| 75 | Kci Manufacturing Unlimited Company | Ireland | Dublin | 25-28 North Wall Quay | Dublin | D01 H104 | N/A | 2007 | $798,940,589 | 399 | N/A | N/A | 442642 |
| 76 | Jti Ireland LIMITED | Ireland | Dublin | Legal Department | Dublin | D24 DCW0 | jti.***** | 2003 | $797,022,573 | 92 | N/A | N/A | 378922 |
| 77 | Xilinx Ireland Unlimited Company | Ireland | Saggart | Legal Department | Dublin | D24 T683 | xilinx.***** | 1994 | $784,772,000 | 368 | N/A | N/A | 190265 |
| 78 | Creganna Unlimited Company | Ireland | Galway | Parkmore Pier | Galway | H91 VN2T | cregannatactx.***** | 2000 | $775,369,016 | 93 | N/A | N/A | 324172 |
| 79 | Abp Foods Unlimited Company | Ireland | Drogheda | 14 Castle Street | Louth | A92 F409 | abpfoodgroup.***** | 1994 | $760,125,186 | 2,818 | N/A | N/A | 214256 |
| 80 | Ingersoll-Rand Industrial Ireland LIMITED | Ireland | Swords | 165 Lakeview Drive | Dublin | K67 EW96 | ricoh.***** | 2019 | $739,483,619 | 509 | N/A | N/A | 655811 |
| 81 | Medtronic Ireland Manufacturing Unlimited Company | Ireland | Dublin | 10 Earlsfort Terrace | Dublin | D02 T380 | N/A | 1999 | $712,225,585 | 100 | N/A | N/A | 314836 |
| 82 | Dawn Meats Finance Unlimited Company | Ireland | Waterford | Grannagh | Kilkenny | X91 HRR3 | dawnmeats.***** | 1980 | $667,059,894 | 9 | N/A | N/A | 78682 |
| 83 | Stryker Ireland LIMITED | Ireland | Youghal | Ida Industrial Estate | Cork | T45 HV12 | stryker.***** | 1997 | $664,069,715 | 1,828 | N/A | N/A | 272391 |
| 84 | Sysco Foods Ireland Unlimited Company | Ireland | Limerick | Shared Services Centre | Limerick | V42 CC44 | syscoireland.***** | 1992 | $652,437,243 | 1,532 | N/A | N/A | 188507 |
| 85 | Aurivo Dairy Ingredients LIMITED | Ireland | Ballaghadereen | Ballaghaderreen | Roscommon | N/A | aurivo.***** | 2002 | $645,445,668 | 658 | N/A | N/A | 356156 |
| 86 | Smurfit Kappa Acquisitions Unlimited Company | Ireland | Dublin 4 | C/o Smurfit Kappa Group Beech Hill | Dublin | N/A | smurfitkappa.***** | 2002 | $611,383,144 | 70 | N/A | N/A | 358039 |
| 87 | Doterra Global LIMITED | Ireland | Dublin | 32 Molesworth Street | Dublin | D02 Y512 | N/A | 2008 | $598,874,550 | 329 | N/A | N/A | 636906 |
| 88 | Limerick Alumina Refining LIMITED | Ireland | Askeaton | Aughinish Island | Clare | N/A | N/A | 1995 | $583,115,000 | 450 | N/A | N/A | 231248 |
| 89 | Mallinckrodt Pharmaceuticals Ireland LIMITED | Ireland | Blanchardstown | College Business & Technology Park | Dublin | D15 TX2V | mallinckrodt.***** | 2014 | $563,337,000 | 528 | N/A | N/A | 548294 |
| 90 | Cook Medical Europe LIMITED | Ireland | Limerick | O Halloran Road | Limerick | N/A | cookmedical.***** | 2010 | $561,953,709 | 282 | N/A | N/A | 492272 |
| 91 | Norton (waterford) LIMITED | Ireland | Waterford | Ida Industrial Park | Waterford | X91 WK68 | teva.***** | 1984 | $561,950,000 | 734 | N/A | N/A | 100363 |
| 92 | E&I Engineering LIMITED | Ireland | Lifford | Slab Road | Donegal | F93 HYH4 | N/A | 2005 | $544,328,646 | 1,062 | N/A | N/A | 401248 |
| 93 | Esb Independent Energy (ni) LIMITED | Ireland | Dublin | 27 Fitzwilliam Street Lower | Dublin | D02 KT92 | esb.***** | 1996 | $512,113,104 | 14 | N/A | N/A | 252609 |
| 94 | Dawn Meats Ireland Unlimited Company | Ireland | Grannagh | C/o Dawn Meats Group | Waterford | X91 HRR3 | dawnmeats.***** | 1985 | $499,904,784 | 2,547 | N/A | N/A | 135414 |
| 95 | Amdipharm LIMITED | Ireland | Dublin 9 | 17 Northwood House | Dublin | D09 V504 | N/A | 2002 | $499,077,560 | 100 | N/A | N/A | 364596 |
| 96 | Green Valley Foods Unlimited Company | Ireland | Cabra | 72/74 Bannow Road | Dublin | D07 XR71 | N/A | 1955 | $497,751,153 | 1,033 | N/A | N/A | 15601 |
| 97 | Sony Interactive Entertainment Ireland LIMITED | Ireland | Dublin | 10 Earlsfort Terrace | Dublin | D02 T380 | stramentertainment.***** | 1999 | $497,336,238 | 12 | N/A | N/A | 316633 |
| 98 | Synergen Power LIMITED | Ireland | Dublin | Pigeon House Road | Dublin | D04 | N/A | 1998 | $485,247,768 | 1 | N/A | N/A | 289737 |
| 99 | Adm Arkady Ireland LIMITED | Ireland | Dublin | 10 Riverwalk | Dublin | D24 TX02 | N/A | 1993 | $482,256,816 | 14 | N/A | N/A | 203539 |
| 100 | L'oreal (UK) LIMITED | Ireland | Dublin | C/o Wework | Dublin | D02 EF64 | N/A | 1971 | $482,073,776 | 2,182 | N/A | N/A | 901549 |