About Grant Thornton LLP
<p>Founded in 1924, Grant Thornton LLP is a public accounting firm that provides audit and assurance, tax, and advisory services.</p> <p>Its headquarters is in Oakbrook Terrace in Chicago’s western suburbs, and the firm works with organizations across the U.S. and internationally.</p> <p>For retirement plan sponsors, Grant Thornton’s audit practice includes work aligned with the needs of <a href="/auditors/401k">401(k) auditors</a> and other ERISA-covered plans. Clients also use the firm for related accounting, reporting, and risk-focused projects that connect to plan administration and corporate finance.</p> <p>A practical differentiator is the range of services under one firm—plan audits can be coordinated with tax and advisory teams when sponsors need broader support.</p> <ul> <li>Audit & assurance services</li> <li>Tax services</li> <li>Advisory services</li> <li>Industry experience in Financial Services, Health Sciences, and Manufacturing</li> </ul>
Website: https://www.grantthornton.com/
Founded: 1924
Office Locations
- Oakbrook Terrace, IL (Headquarters)
Accreditations & Certifications
- AICPA EBPAQC
- AICPA Member
Audit Statistics (2024)
- Total Plans Audited: 798
- Total AUM Audited: $403.0B
- 401(k): 798 plans, $403.0B AUM
Plans Serviced (2025)
Largest plans where this firm is listed as a service provider (Schedule C) or IQPA (Schedule H) on the most recent filings (From Form 5500).
| Plan | Sponsor | Assets | Participants |
|---|---|---|---|
| RTX CONSOLIDATED PENSION PLAN | RTX CORPORATION, CT | $41.6B | 33,534 |
| CHEVRON EMPLOYEE SAVINGS INVESTMENT PLAN | CHEVRON CORPORATION, TX | $20.4B | 22,195 |
| ABBOTT LABORATORIES STOCK RETIREMENT PLAN | ABBOTT LABORATORIES, IL | $15.7B | 38,001 |
| WALGREENS RETIREMENT SAVINGS PLAN | WALGREEN CO., IL | $14.5B | 215,583 |
| U.S. ROCHE 401(K) SAVINGS PLAN | GENENTECH, INC., CA | $14.3B | 21,619 |
| 401(k) Retirement Plan | Healthcare Sponsor, FL | $13.2B | 49,697 |
| 401(k) Retirement Plan | Manufacturing Sponsor, VA | $11.8B | 30,281 |
| 401(k) Retirement Plan | Professional Services Sponsor, NJ | $10.5B | 36,163 |
| 401(k) Retirement Plan | Technology Sponsor, NY | $9.8B | 14,729 |
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