Ranked by number of total plan participants
| Rank | Company | Address | Phone/Website | Total participants | Total 401(k) staff | Principal officer |
| 1 | Hewitt Associates L.L.C.1 | 100 Half Day Road, Lincolnshire, Ill. 60069 | 847-295-5000 www.hewitt.com | 3,404,195 | 4,000 | Russ Fradin, chairman/CEO |
| 2 | ING U.S. Retirement Services | One Orange Way, Windsor, Conn. 06095 | 888-639-2798 www.ing-usa.com | 3,201,420 | 1,390 | Richard Mason, president-corporate markets |
| 3 | Principal Financial Group | P.O. Box 9397, Des Moines, Iowa 50306-9397 | 800-986-3343 www.principal.com | 2,723,471 | 3,217 | Dan Houston, president-retirement and investor services |
| 4 | Great-West Retirement Services | 8515 E. Orchard Road, Greenwood Village, Colo. 80111 | 303-737-3000 www.gwrs.com | 1,866,930 | 2,217 | Mitchel Graye, CEO |
| 5 | Ascensus Inc. | 200 Dryden Road, Dresher, Pa. 19025 | 800-345-6363 www.ascensus.com | 1,314,285 | 1,000 | Bob Guillocheau, president |
| 6 | Charles Schwab | 4150 Kinross Lakes Parkway, Richfield, Ohio 44286 | 877-456-0777 www.scrs.schwab.com | 1,181,309 | 900 | Steve Anderson, senior vp-retirement plan services |
| 7 | Paychex Inc. | 911 Panorama Trail S., Rochester, N.Y. 14625 | 585-385-6666 www.paychex.com | 600,000 | 1,200 | Jonathan J. Judge, president/CEO |
| 8 | Standard | 1100 S.W. Sixth Ave., Portland, Ore. 97204 | 971-645-3988 www.retirement.standard.com | 571,764 | 700 | Gregory Ness, CEO |
| 9 | Milliman Inc. | 1301 Fifth Ave., Suite 3800, Seattle, Wash. 98101 | 206-624-7940 www.milliman.com | 511,896 | 250 | Patrick J. Grannan, president/CEO |
| 10 | Transamerica Retirement Services | 1150 S. Olive St., Los Angeles, Calif. 90015 | 888-401-5826 www.ta-retirement.com | 507,503 | 657 | Stig Nybo, president |
Researched by Kevin Edison and Karen Tucker
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