Ketel Thorstenson, LLP

Employee Benefit Plan Auditor

Rapid City, SD

About Ketel Thorstenson, LLP

<p>Founded in 1936, Ketel Thorstenson, LLP is a CPA firm with 126 employees based in Rapid City in western South Dakota, serving clients across the Black Hills region.</p> <p>The firm provides accounting, tax, and advisory services for businesses and individuals. Its audit work includes retirement plan engagements, with Stephen Schacht listed as a key contact and auditor.</p> <p>Clients use Ketel Thorstenson for practical support such as tax planning, audit services, and business consulting. The team’s long operating history and in-house mix of audit and tax staff makes it a fit for organizations that want both day-to-day accounting help and formal assurance work from the same firm.</p> <p>More details are available at <a href="https://www.ktllp.cpa/" target="_blank" rel="noopener">https://www.ktllp.cpa/</a>.</p> <ul> <li>Type: <a href="/auditors/401k">401(k) auditors</a></li> <li>Founded: 1936</li> <li>Employees: 126</li> <li>Location: Rapid City, South Dakota (Black Hills area)</li> <li>Services: accounting, tax, advisory, and audit</li> </ul>

Website: https://www.ktllp.cpa/

Founded: 1936

Employees: 126

Office Locations

  • Rapid City, SD

Accreditations & Certifications

  • AICPA EBPAQC
  • AICPA Member

Audit Statistics (2024)

  • Total Plans Audited: 35
  • Total AUM Audited: $862.0M
  • 401(k): 35 plans, $862.0M 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).

PlanSponsorAssetsParticipants
RAPID CITY MEDICAL CENTER 401(K) PLANRAPID CITY MEDICAL CENTER, LLP, SD$75M437
RE/SPEC INC. EMPLOYEE 401(K) RETIREMENT PLANRE/SPEC INC., SD$67M487
BLACK HILLS FEDERAL CREDIT UNION 401(K) PLANBLACK HILLS FEDERAL CREDIT UNION, SD$60M372
BANKWEST 401(K) PLANBANKWEST, INC., SD$59M357
SOUTH DAKOTA ASSOCIATIONS OF COMMUNITY-BASED HUMAN SERVICES RETIREMENT PLANSOUTH DAKOTA COUNCIL OF COMMUNITY BEHAVIORAL HEA, SD$53M1,810
BLACK HILLS SURGICAL HOSPITAL 401(K) AND PROFIT SHARING PLANBLACK HILLS SURGICAL HOSPITAL, LLP, SD$51M463
RE/SPEC INC. EMPLOYEE STOCK OWNERSHIP PLANRE/SPEC INC., SD$45M568
RIDDLE'S GROUP, INC. RETIREMENT SAVINGS PLANRIDDLE'S GROUP, INC., SD$40M538
HAWKINS ASH CPAS, LLP RETIREMENT PLANHAWKINS ASH CPAS, LLP, WI$34M215
BLACK HILLS ORTHOPEDIC AND SPINE CENTER 401(K) PROFIT SHARING PLANBLACK HILLS ORTHOPEDIC AND SPINE CENTER, SD$30M157
SECURITY FIRST BANK 401(K) PLANSECURITY FIRST BANK, SD$30M282
TAKKION OPS MANAGEMENT LLC 401(K) PLANTAKKION OPS MANAGEMENT LLC, WY$26M1,621
COPELAND BUHL & COMPANY, PLLP PROFIT SHARING PLANCOPELAND BUHL & COMPANY PLLP, MN$23M111
BROSZ ENGINEERING, INC. 401(K) PROFIT SHARING PLANBROSZ ENGINEERING, INC., ND$22M109
LLOYD COMPANIES 401(K) PLAN AND TRUSTLLOYD COMPANIES, INC., SD$20M353
BLACK HILLS REGIONAL EYE INSTITUTE 401(K) PLAN AND TRUSTBLACK HILLS REGIONAL EYE INSTITUTE, LLP, SD$17M113
FLOYD'S TRUCK CENTER, INC. 401(K) PLANFLOYDS TRUCK CENTER, INC., NE$15M227
MIDWESTERN MECHANICAL, INC. 401(K) PROFIT SHARING PLANMIDWESTERN MECHANICAL, INC., SD$13M275
MIDWEST RAILCAR REPAIR RETIREMENT SECURITY PARTNERSHIP PLANMIDWEST RAILCAR REPAIR, INC., SD$11M144
MCKIE FORD LINCOLN, INC & AFFILIATES 401(K) PLANMCKIE FORD LINCOLN, INC & AFFILIATES, SD$11M172

Showing top 20 of 33 plans serviced in 2025.

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