Connecticut Employer EIN Lookup
Use this ConnecticutEIN lookup to find an employer’s Employer Identification Number from its public Form 5500 filing. 15,087 employers based in Connecticut have filed a Form 5500, covering 17,279 retirement and health plans with $348.5B in reported assets. The largest are listed below with their EIN — open any employer to see the full filing.
Employers
15,087
Plans
17,279
Total assets
$348.5B
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 | 823,280 | $33.4B |
| YALE UNIVERSITY | 06-0646973 | NEW HAVEN | 6 | 86,320 | $13.0B |
| EVERSOURCE ENERGY SERVICE COMPANY | 06-0810627 | HARTFORD | 6 | 32,818 | $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 | 76,620 | $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 | 43,629 | $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 |
| NUVANCE HEALTH | 83-4214573 | DANBURY | 3 | 22,760 | $2.0B |
| SS&C TECHNOLOGIES, INC | 06-1169696 | WINDSOR | 2 | 20,343 | $1.8B |
| EMCOR GROUP, INC. | 11-2125338 | NORWALK | 3 | 28,788 | $1.8B |
| HUBBELL INCORPORATED | 06-0397030 | SHELTON | 9 | 26,611 | $1.7B |
| CRANE COMPANY | 88-2846451 | STAMFORD | 4 | 8,629 | $1.6B |
| GENERAL RE CORPORATION | 06-1026471 | STAMFORD | 3 | 3,092 | $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 | 4,383 | $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 |
| WESTERN CONNECTICUT HEALTH NETWORK, INC. | 22-2594977 | DANBURY | 1 | 1,570 | $964.1M |
| EDGEWELL PERSONAL CARE COMPANY | 43-1863181 | SHELTON | 5 | 4,601 | $949.6M |
| 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 |
| 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 | 1,598 | $759.0M |
| BOARD OF TRUSTEES I.U.O.E. LOCAL 478 PENSION PLAN | 06-0733831 | HAMDEN | 1 | 2,487 | $758.6M |
| LEGRAND HOLDING, INC. | 98-0065554 | WEST HARTFORD | 3 | 9,723 | $751.1M |
| HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED | 11-2534306 | STAMFORD | 2 | 33,376 | $737.0M |
| THE NASSAU COMPANIES OF NEW YORK | 06-1599088 | HARTFORD | 4 | 1,735 | $715.6M |
| WESLEYAN UNIVERSITY | 06-0646959 | MIDDLETOWN | 3 | 2,957 | $688.1M |
| TEREX CORPORATION | 34-1531521 | NORWALK | 4 | 24,377 | $687.4M |
| TRC COMPANIES, LLC. | 82-1842424 | WINDSOR | 2 | 13,438 | $679.0M |
| AHLSTROM USA INC. | 13-3509370 | WINDSOR LOCKS | 3 | 5,261 | $629.9M |
| BARNES GROUP INC. | 06-0247840 | BRISTOL | 11 | 3,088 | $627.8M |
| BRIDGEWATER ASSOCIATES, LP | 27-1437501 | WESTPORT | 2 | 2,382 | $613.9M |
| CONNECTICUT LABORERS' PENSION FUND BOARD OF TRUSTEES | 06-6044348 | WEST HAVEN | 1 | 2,425 | $600.6M |
| NATWEST MARKETS SECURITIES, INC. | 13-3172275 | STAMFORD | 3 | 808 | $588.9M |
| POINT72, L.P. | 81-3985683 | STAMFORD | 2 | 4,043 | $582.2M |
| QUINNIPIAC UNIVERSITY | 06-0646701 | HAMDEN | 3 | 3,541 | $575.2M |
| PMI GLOBAL SERVICES INC | 03-0494952 | STAMFORD | 6 | 803 | $570.2M |
| 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 | 11,550 | $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 |
| 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 | 14,373 | $500.1M |
| FAIRFIELD UNIVERSITY | 06-0646623 | FAIRFIELD | 2 | 2,277 | $492.6M |
| OTIS WORLDWIDE CORPORATION | 83-3789412 | FARMINGTON | 5 | 11,053 | $478.3M |
| MIDDLESEX HEALTH | 22-2676137 | MIDDLETOWN | 2 | 7,899 | $473.2M |
| UFCW UNION LOCAL 919 & CONTRIBUTING EMPL PENSION | 06-1065206 | FARMINGTON | 2 | 4,277 | $470.6M |
| BLUETRITON BRANDS, INC. | 94-3027237 | STAMFORD | 2 | 14,189 | $469.7M |
| UNIVERSITY OF HARTFORD | 06-0731360 | WEST HARTFORD | 2 | 1,540 | $457.5M |
| RICHEMONT NORTH AMERICA, INC. | 13-2852910 | SHELTON | 2 | 6,767 | $456.5M |
| THE LEE COMPANY | 06-0639381 | WESTBROOK | 3 | 2,110 | $451.4M |
| GXO ENTERPRISE SERVICES, LLC | 86-2098312 | GREENWICH | 2 | 21,896 | $438.3M |
| IBG LLC | 13-3832398 | GREENWICH | 2 | 2,712 | $437.0M |
| H N S MANAGEMENT COMPANY INC | 06-1002064 | HARTFORD | 4 | 3,808 | $434.0M |
| YALE NEW HAVEN HEALTH SERVICES CORPORATION | 22-2529464 | NEW HAVEN | 3 | 20,269 | $432.3M |
| TRONOX INCORPORATED | 20-2868245 | STAMFORD | 3 | 1,533 | $432.2M |
| LEGO SYSTEMS, INC | 06-0891387 | ENFIELD | 3 | 8,125 | $429.2M |
| MASHANTUCKET PEQUOT TRIBE | 06-0995554 | MASHANTUCKET | 2 | 8,002 | $424.9M |
| GREENWICH HOSPITAL | 06-0646659 | GREENWICH | 3 | 4,512 | $398.9M |
| 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 | 583 | $394.8M |
| TRINITY COLLEGE | 06-0646927 | HARTFORD | 2 | 1,318 | $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 |
| 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 |
| UNIVERSITY OF NEW HAVEN | 06-0761704 | WEST HAVEN | 2 | 1,643 | $317.9M |
| CENVEO WORLDWIDE LIMITED | 83-1681581 | STAMFORD | 4 | 3,900 | $315.7M |
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?