Insights

Established Trusted Advisor Leverage Olsen Thielen's 95-year track record and status as a Top 25 Twin Cities firm to position complementary advisory services such as valuations, succession planning, and forensic accounting to mid-market clients seeking stability and expert guidance.

Full Service Offerings Cross-sell opportunities across traditional accounting, tax, HR, employee benefits, back-office cloud accounting, and industry-specific consulting for telecommunications, professional services, manufacturing and distribution, not-for-profits, utilities, and real estate.

Cloud and Tech Readiness Target firms needing modernized finance operations by highlighting Olsen Thielen’s cloud accounting, back-office solutions, and technology stack (QuickBooks, Microsoft 365, Sage) to improve efficiency, reporting, and compliance.

Financial Scale Cues With estimated revenue between 100M and 250M and a mid-market profile, pursue cross-border and growth-focused engagements such as due diligence, internal controls, fraud prevention, and post-merger integration for expanding organizations.

Industry Specialization Capitalize on deep sector experience in telecommunications, professional services, manufacturing and distribution, not-for-profits, utilities, and real estate. Offer tailored solutions like industry-specific tax planning, compliance, and executive advisory to differentiate from competitors.

Olsen Thielen and Co., Ltd. Tech Stack

Olsen Thielen and Co., Ltd. uses 8 technology products and services including Quickbooks Online, Power BI, Amazon Web Services, and more. Explore Olsen Thielen and Co., Ltd.'s tech stack below.

Olsen Thielen and Co., Ltd.'s Email Address Formats

Olsen Thielen and Co., Ltd. uses at least 1 format(s):
Olsen Thielen and Co., Ltd. Email FormatsExamplePercentage
FLast@otcpas.comJDoe@otcpas.com
90%
FirstLast@otcpas.comJohnDoe@otcpas.com
7%
First.Last@otcpas.comJohn.Doe@otcpas.com
2%
Last@otcpas.comDoe@otcpas.com
1%

Frequently Asked Questions

What is Olsen Thielen and Co., Ltd.'s phone number?

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You can contact Olsen Thielen and Co., Ltd.'s main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Olsen Thielen and Co., Ltd.'s official website and social media links?

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Olsen Thielen and Co., Ltd.'s official website is otcpas.com and has social profiles on LinkedIn.

How much revenue does Olsen Thielen and Co., Ltd. generate?

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As of August 2026, Olsen Thielen and Co., Ltd.'s annual revenue is estimated to be $100M - $250M.

What is Olsen Thielen and Co., Ltd.'s SIC code NAICS code?

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Olsen Thielen and Co., Ltd.'s SIC code is 7389 - Business Services, Not Elsewhere Classified NAICS code is 5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services.

How many employees does Olsen Thielen and Co., Ltd. have currently?

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As of August 2026, Olsen Thielen and Co., Ltd. has approximately 139 employees across 2 continents, including North AmericaEurope. Key team members include Chief Executive Officer: C. B.Chief Executive Officer: V. G.Chief People Officer: V. F.. Explore Olsen Thielen and Co., Ltd.'s employee directory with LeadIQ.

What industry does Olsen Thielen and Co., Ltd. belong to?

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Olsen Thielen and Co., Ltd. operates in the Accounting industry.

What technology does Olsen Thielen and Co., Ltd. use?

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Olsen Thielen and Co., Ltd.'s tech stack includes Quickbooks OnlinePower BIAmazon Web ServicesMicrosoft 365Mimecast Secure Email GatewayZoomInfoPaylocityMicrosoft Teams.

What is Olsen Thielen and Co., Ltd.'s email format?

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Olsen Thielen and Co., Ltd.'s email format typically follows the pattern of FLast@otcpas.com. Find more Olsen Thielen and Co., Ltd. email formats with LeadIQ.

When was Olsen Thielen and Co., Ltd. founded?

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Olsen Thielen and Co., Ltd. was founded in 1921.
Olsen Thielen and Co., Ltd. logo

Olsen Thielen and Co., Ltd.

AccountingMinnesota, United States51-200 Employees

Olsen Thielen & Co., Ltd. is a full-service accounting and consulting firm based in St. Paul, Minnesota, with a history spanning more than 95 years. The firm serves a diverse range of clients across industries such as telecommunications, professional services, manufacturing and distribution, not-for-profit organizations, utilities, and real estate and construction, delivering traditional accounting and tax services alongside non-traditional offerings. Its advisory scope includes valuations, human resources and employee benefit consulting, back-office cloud accounting solutions, as well as estate, gift, and succession planning, and fraud and forensic accounting, aimed at helping owners and management teams meet their organizational goals. Olsen Thielen emphasizes experience, specialized skills, and principled service as core elements of its practice. A notable development in the recent period is the introduction of the Olsen Thielen Advisor Video Series, signaling a broader approach to client education and guidance from the firm.

Section iconCompany Overview

Phone number
Website
otcpas.com
SIC Code
7389 - Business Services, Not Elsewhere Classified
NAICS Code
5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Founded
1921
Employees
51-200

Section iconFunding & Financials

  • $100M - $250M

    Olsen Thielen and Co., Ltd.'s revenue is estimated to be in the range of $100M - $250M

Section iconFunding & Financials

  • $100M - $250M

    Olsen Thielen and Co., Ltd.'s revenue is estimated to be in the range of $100M - $250M

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