Connecticut Employer EIN Lookup
Use this ConnecticutEIN lookup to find an employer’s Employer Identification Number from its public Form 5500 filing. 16,083 employers based in Connecticut have filed a Form 5500, covering 18,344 retirement and health plans with $357.4B in reported assets. The largest are listed below with their EIN — open any employer to see the full filing.
Employers
16,083
Plans
18,344
Total assets
$357.4B
Largest employers in Connecticut by EIN
Form 5500 search →| Employer | EIN | City | Plans | Participants | Assets |
|---|---|---|---|---|---|
| RTX Corporation | 06-0570975 | Farmington | 10 | 225,150 | $100.4B |
| Citigroup Inc. | 52-1568099 | Stamford | 17 | 808,625 | $37.0B |
| YALE University | 06-0646973 | New Haven | 6 | 86,466 | $13.4B |
| Eversource Energy Service Company | 06-0810627 | Hartford | 6 | 33,183 | $10.6B |
| Hartford Fire Insurance Company | 06-0383750 | Hartford | 15 | 164,864 | $7.2B |
| Xerox Corporation | 16-0468020 | Norwalk | 11 | 34,328 | $5.6B |
| Frontier Communications Parent, Inc. | 86-2359749 | Norwalk | 20 | 83,256 | $5.6B |
| Hartford Healthcare Corporation | 22-2672834 | Farmington | 6 | 65,497 | $5.5B |
| Aetna Inc. | 23-2229683 | Hartford | 3 | 9,428 | $5.3B |
| Linde Inc. | 06-1249050 | Danbury | 6 | 29,868 | $5.1B |
| Boehringer Ingelheim USA Corporation | 74-3197526 | Ridgefield | 4 | 34,258 | $4.7B |
| YALE-New Haven Hospital, Inc. | 06-0646652 | New Haven | 3 | 62,087 | $3.9B |
| The Hartford Financial Services Group, Inc. | 13-3317783 | Hartford | 1 | 6,527 | $3.4B |
| Frontier Communications Corporation | 06-0619596 | Norwalk | 1 | 13,220 | $2.9B |
| Henkel of America, Inc. | 41-1372525 | Stamford | 10 | 13,617 | $2.8B |
| Pitney Bowes Inc. | 06-0495050 | Stamford | 10 | 48,441 | $2.7B |
| Gartner, Inc. | 04-3099750 | Stamford | 4 | 41,691 | $2.7B |
| Stanley Black & Decker, Inc. | 06-0548860 | New Britain | 5 | 36,468 | $2.6B |
| Avangrid Management Company, LLC | 45-5063049 | Orange | 2 | 8,263 | $2.6B |
| W.R. Berkley Corporation | 22-1867895 | Greenwich | 2 | 12,548 | $2.3B |
| United Rentals (North America), Inc. | 86-0933835 | Stamford | 1 | 23,378 | $2.3B |
| Tetra Tech, Inc. | 95-4148514 | New Milford | 1 | 10,454 | $2.2B |
| Nuvance Health | 83-4214573 | Danbury | 3 | 23,187 | $2.0B |
| SS&C Technologies, Inc. | 06-1169696 | Windsor | 2 | 20,335 | $1.8B |
| Emcor Group, Inc. | 11-2125338 | Norwalk | 3 | 29,289 | $1.8B |
| Hubbell Incorporated | 06-0397030 | Shelton | 9 | 26,611 | $1.7B |
| General RE Corporation | 06-1026471 | Stamford | 3 | 3,204 | $1.7B |
| Crane Company | 88-2846451 | Stamford | 4 | 8,629 | $1.6B |
| Central Maine Power Company | 01-0042740 | Orange | 4 | 3,912 | $1.6B |
| Synchrony Financial | 51-0483352 | Stamford | 5 | 31,266 | $1.6B |
| ASSA Abloy Incorporated | 93-0925319 | New Haven | 9 | 67,284 | $1.4B |
| XL America, Inc. | 06-1516268 | Stamford | 3 | 4,512 | $1.4B |
| North Atlantic States Carpenters Annuity Plan | 06-1308364 | Hamden | 1 | 10,262 | $1.3B |
| Amphenol Corporation & Affiliated Companies | 22-2785165 | Wallingford | 5 | 15,767 | $1.2B |
| ITT Industries Holdings, Inc. | 34-1990908 | Stamford | 3 | 7,503 | $1.2B |
| Indeed, Inc. | 26-0129478 | Stamford | 7 | 38,840 | $1.1B |
| SS&C GIDS, Inc. | 43-1581814 | Windsor | 1 | 2,581 | $1.1B |
| Board of Trustees-New England Health Care Employees Pension Fund | 22-3071963 | Hartford | 1 | 9,160 | $1.0B |
| Kaman Corporation | 06-0613548 | Bloomfield | 4 | 6,117 | $973.2M |
| Edgewell Personal Care Company | 43-1863181 | Shelton | 5 | 4,537 | $949.9M |
| Western Connecticut Health Network, Inc. | 22-2594977 | Danbury | 1 | 1,460 | $922.4M |
| New England Electrical Workers Money Purchase Plan and Trust | 06-0962207 | Meriden | 1 | 10,678 | $870.3M |
| Factset Research Systems Inc. | 13-3362547 | Norwalk | 2 | 4,668 | $863.3M |
| Knights of Columbus Supreme Council | 06-0416470 | New Haven | 8 | 5,252 | $863.0M |
| Harman International Industries, Incorporated | 11-2534306 | Stamford | 2 | 33,136 | $836.4M |
| TRC Companies, LLC. | 87-3351290 | Windsor | 2 | 13,478 | $776.1M |
| GE Capital US Holdings, Inc. | 47-4432326 | Norwalk | 3 | 108 | $775.6M |
| Purdue Pharma L.P. | 06-1307484 | Stamford | 6 | 1,526 | $759.0M |
| Board of Trustees I.U.O.E. Local 478 Pension Plan | 06-0733831 | Hamden | 1 | 2,487 | $758.6M |
| Terex Corporation | 34-1531521 | Norwalk | 4 | 24,350 | $757.7M |
| Legrand Holding, Inc. | 98-0065554 | West Hartford | 3 | 9,723 | $751.1M |
| The Nassau Companies of New York | 06-1599088 | Hartford | 4 | 1,735 | $715.6M |
| Ahlstrom USA Inc. | 13-3509370 | Windsor Locks | 2 | 2,930 | $703.8M |
| Wesleyan University | 06-0646959 | Middletown | 3 | 2,957 | $688.1M |
| TRC Companies, LLC. | 82-1842424 | Windsor | 2 | 13,438 | $679.0M |
| Barnes Group Inc. | 06-0247840 | Bristol | 11 | 3,088 | $627.8M |
| Natwest Markets Securities, Inc. | 13-3172275 | Stamford | 3 | 785 | $626.6M |
| Bridgewater Associates, LP | 27-1437501 | Westport | 2 | 2,326 | $613.9M |
| Connecticut Laborers' Pension Fund Board of Trustees | 06-6044348 | West Haven | 1 | 2,425 | $600.6M |
| Point72, L.P. | 81-3985683 | Stamford | 2 | 4,043 | $582.2M |
| Quinnipiac University | 06-0646701 | Hamden | 3 | 3,562 | $575.2M |
| PMI Global Services Inc. | 03-0494952 | Stamford | 6 | 803 | $570.2M |
| Fairfield University | 06-0646623 | Fairfield | 2 | 2,417 | $550.9M |
| Connecticut Children's Medical Center | 06-0646755 | Hartford | 4 | 8,053 | $542.5M |
| Hexcel Corporation | 94-1109521 | Stamford | 3 | 6,341 | $540.8M |
| Bridgeport Hospital | 06-0646554 | Bridgeport | 13 | 8,718 | $540.4M |
| Odyssey Reinsurance Company | 47-0698507 | Stamford | 4 | 2,224 | $537.6M |
| Iqvia Incorporated | 06-1506026 | Danbury | 2 | 1,116 | $531.3M |
| BIC Corporation | 06-0735597 | Shelton | 6 | 1,840 | $523.1M |
| Booking Holdings Inc. | 06-1528493 | Norwalk | 2 | 5,995 | $519.2M |
| YALE New Haven Health Services Corporation | 22-2529464 | New Haven | 3 | 20,134 | $513.5M |
| Equinor US Holdings Inc. | 13-3415760 | Stamford | 3 | 2,057 | $509.3M |
| Stamford Health, Inc. | 22-2476636 | Stamford | 3 | 6,865 | $504.5M |
| The Mohegan Tribe of Indians of Connecticut | 06-1436334 | Uncasville | 2 | 14,341 | $500.1M |
| The Lee Company | 06-0639381 | Westbrook | 3 | 2,141 | $480.5M |
| OTIS Worldwide Corporation | 83-3789412 | Farmington | 5 | 11,056 | $478.7M |
| Middlesex Health | 22-2676137 | Middletown | 2 | 7,899 | $473.2M |
| UFCW Union Local 919 & Contributing EMPL Pension | 06-1065206 | Farmington | 2 | 4,277 | $470.7M |
| Bluetriton Brands, Inc. | 94-3027237 | Stamford | 2 | 14,199 | $469.7M |
| Tronox Incorporated | 20-2868245 | Stamford | 3 | 1,527 | $469.2M |
| University of Hartford | 06-0731360 | West Hartford | 2 | 1,515 | $457.5M |
| Richemont North America, Inc. | 13-2852910 | Shelton | 2 | 6,767 | $456.5M |
| GXO Enterprise Services, LLC | 86-2098312 | Greenwich | 2 | 21,896 | $438.3M |
| IBG LLC | 13-3832398 | Greenwich | 2 | 2,738 | $437.0M |
| H N S Management Company Inc. | 06-1002064 | Hartford | 4 | 3,808 | $434.0M |
| LEGO Systems, Inc. | 06-0891387 | Enfield | 1 | 4,104 | $429.2M |
| Mashantucket Pequot Tribe | 06-0995554 | Mashantucket | 2 | 8,039 | $424.9M |
| Greenwich Hospital | 06-0646659 | Greenwich | 3 | 4,439 | $415.2M |
| Ipsos America, Inc. | 52-2073631 | Norwalk | 2 | 3,912 | $398.8M |
| Apollo Management Holdings, LP | 20-8351069 | Greenwich | 2 | 3,805 | $396.2M |
| Petroleum Heat and Power Co., Inc. | 06-1183025 | Stamford | 3 | 2,971 | $395.6M |
| MOTT Corporation | 06-0741455 | Farmington | 3 | 563 | $394.8M |
| Trinity College | 06-0646927 | Hartford | 2 | 1,333 | $381.4M |
| Board of Trustees IUOE Local 478 Annuity Fund | 06-1230516 | Hamden | 1 | 3,617 | $377.3M |
| Lawrence & Memorial Hospital | 06-0646704 | New London | 3 | 4,346 | $369.4M |
| Louis Dreyfus Company LLC | 27-3304138 | Wilton | 5 | 2,840 | $368.7M |
| Lone Pine Capital LLC | 31-1679699 | Greenwich | 1 | 104 | $364.8M |
| The United Illuminating Company | 06-0571640 | Orange | 4 | 825 | $338.9M |
| Virtus Investment Partners, Inc. | 95-4191764 | Hartford | 1 | 750 | $330.1M |
| Robinson & Cole LLP | 06-0512640 | Hartford | 3 | 1,021 | $325.0M |
EINs are drawn from the Form 5500 the employer filed with the U.S. Department of Labor. An employer’s EIN is the same across all of its plans — open a filing to confirm the sponsor name and address before relying on it.
How to find an employer’s EIN in Connecticut
Every employer that sponsors a retirement or health plan files a Form 5500 that lists its nine-digit Employer Identification Number. Find a Connecticut company in the table above, or run a Form 5500 search by company name to pull the filing and read the EIN directly from it.
For a broader view of plans in the state — including industry breakdowns and the largest plans by assets — see Form 5500 plans in Connecticut. New to these filings? Start with What is Form 5500?
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