About Olsen Thielen & Co., Ltd.
<p>Founded in 2012, Olsen Thielen & Co., Ltd. operates from Roseville in the Twin Cities metro, with its headquarters at 2675 Long Lake Road.</p> <p>The firm is a Certified Public Accountants & Advisors practice that handles assurance work alongside individual and corporate tax. It also provides financial planning, business consulting, and technology-related support for organizations that want accounting help and day-to-day advisory services in one place.</p> <p>For retirement plan sponsors looking for <a href="/auditors/401k">401(k) auditors</a> and other assurance support, Olsen Thielen brings regional experience across Minnesota and the Upper Midwest. Clients work with a local team rather than a distant national office.</p> <p>What sets Olsen Thielen apart is its focus on internal development and an inclusive workplace culture, built around the idea that investing in employee growth improves the consistency and quality of client work.</p> <ul> <li>Assurance services, including retirement plan audit support</li> <li>Individual and corporate tax services</li> <li>Financial planning</li> <li>Business consulting</li> <li>Technology-focused advisory services</li> </ul>
Website: https://www.otcpas.com/
Founded: 2012
Office Locations
- Roseville, MN (Headquarters)
Accreditations & Certifications
- AICPA EBPAQC
- AICPA Member
Audit Statistics (2024)
- Total Plans Audited: 97
- Total AUM Audited: $14.2B
- 401(k): 97 plans, $14.2B 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 |
|---|---|---|---|
| RBC- U.S.A. RETIREMENT AND SAVINGS PLAN | RBC USA HOLDCO CORPORATION, MN | $4.3B | 10,111 |
| ECOLAB SAVINGS PLAN AND ESOP | ECOLAB INC., MN | $4.2B | 19,704 |
| ECOLAB PENSION PLAN | ECOLAB INC., MN | $1.7B | 17,433 |
| HBI 401(K) RETIREMENT SAVINGS PLAN | HUBBARD BROADCASTING, INC., MN | $384M | 1,712 |
| STARKEY LABORATORIES, INC. EMPLOYEE RETIREMENT PLAN | STARKEY LABORATORIES, INC., MN | $301M | 1,473 |
| 401(k) Retirement Plan | Healthcare Sponsor, MN | $247M | 3,207 |
| 401(k) Retirement Plan | Manufacturing Sponsor, MN | $190M | 419 |
| 401(k) Retirement Plan | Professional Services Sponsor, MN | $187M | 817 |
| 401(k) Retirement Plan | Technology Sponsor, MN | $154M | 242 |
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