Rietmann & Partner

What Rietmann & Partner does

Rietmann & Partner, legally Dr. Rietmann & Partner AG, is a St. Gallen-based professional services firm founded in 1911 as the first Treuhandbüro (fiduciary office) in the city. It operates as a partner-led Swiss Aktiengesellschaft serving private individuals, small and medium-sized enterprises (KMU), and medium-sized corporations across German-speaking Switzerland. The firm offers four integrated service lines: Wirtschaftsprüfung (statutory and limited audits), Steuerberatung (tax advisory including national/international tax, VAT, and tax planning), M&A-Beratung (succession planning, business valuations, due diligence), and Treuhand (bookkeeping, payroll administration, financial statement preparation, management information systems, and executor mandates).

The firm operates on a Partner-Prinzip model under which partners are directly involved in client work and retain co-ownership (Miteigentümer) stakes. It currently lists nine partners including Walter Schwander (since 1993), Marcel Metzler (since 1996), Michael Schwander (since 2011), Christian Siebert (since 2020), Manuela Schnyder (since 2020), Silvia Süss (since 2021, head of fiduciary), Michael Thomssen (since 2021), Marco Baumann (since 2022), and Oscar Maier (since September 2024, ex-PwC St. Gallen). Credentials across the partnership include dipl. Wirtschaftsprüfer, dipl. Steuerexperte, Certified IFRS Accountant, Certified Fraud Examiner, and M.A. HSG qualifications. The firm is a member of EXPERTsuisse, the national Swiss expert association for audit, tax, and fiduciary services.

Revenue is generated through professional services fees on a project/quote basis across audit, tax, M&A, and recurring fiduciary work. The technology footprint is conventional for a professional services firm — no proprietary platform, no APIs, no AI/ML systems disclosed. Distribution is exclusively direct, partner-led client engagement from the single St. Gallen headquarters at Vadianstrasse 44, with no satellite offices, channel partners, or indirect distribution mechanisms. Marketing relies on the firm's 100+ year brand, its professional website, Google My Business, and a LinkedIn company page.

Name

Rietmann & Partner

Legal name

Dr. Rietmann & Partner AG

Website

https://rietmann-partner.ch

Company type

Private

Founded year

1911

Operating status

Operating

Headcount range

11–50 employees

Short description

Rietmann & Partner (Dr. Rietmann & Partner AG) is a St. Gallen, Switzerland-based professional services firm founded in 1911, offering partner-led auditing, tax advisory, M&A consulting, and fiduciary services to private individuals, SMEs, and medium-sized corporations across Switzerland.

Ownership category

akta.pro rank

Product category

Accounting and Audit Services

NAICS

Portfolio Management and Investment Advice (523940), Management Consulting Services (54161)

SIC

Investment Advice (6282), Services-Management Consulting Services (8742)

akta.pro primary industry

Comprehensive/Full-Service RIAs & Independent Wealth Managers (FSAAACAA)

akta.pro secondary industry

Tax-Focused Wealth Management RIAs (FSAAACAD)

Keywords

• Audit and assurance services
• Tax advisory consulting
• M&A advisory services
• Fiduciary and bookkeeping services
• Succession planning advisory

Headquarters

HQ city

Saint Gallen

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Others

Revenue model

1. Professional Services Fees: Rietmann & Partner generates revenue through fees for professional services including audit/revision, tax advisory, M&A consulting, and trust services. Services are provided to private individuals, SMEs, and medium-sized corporations.

Distribution channels1 record

Marketing channels3 records

Core offering

Rietmann & Partner is a Swiss professional services firm providing statutory and limited audits, tax advisory (national and international, including VAT), M&A consulting (due diligence, business valuations, succession planning), and fiduciary services (bookkeeping, payroll, financial statements, management information systems). Services are delivered partner-led to private individuals, SMEs, and medium-sized corporations across Switzerland, with Eastern Swiss roots.

Product overview

Rietmann & Partner is a professional services firm offering an integrated portfolio of four core service lines: Wirtschaftsprüfung (auditing), Steuerberatung (tax advisory), M&A-Beratung (M&A consulting), and Treuhand (fiduciary services). The firm operates on a partner-led model, with each service area supported by specialists with qualifications including Swiss-certified auditors, tax experts, and trust professionals. Services are delivered to private individuals, SMEs, and larger corporations primarily in the Swiss market.

Differentiator

Problem solved

Functional benefit

Products and services

• Wirtschaftsprüfung (Auditing Services) Statutory and specialized auditing services including ordinary and limited audit reviews under national and international accounting standards, plus individual audit engagements tailored to SMEs and larger enterprises.
• Steuerberatung (Tax Advisory) Comprehensive tax advisory covering tax return preparation, complex national and international tax matters, VAT (Swiss and EU), forward-looking tax planning, and tax appeal support for private individuals, SMEs, and corporations.
• M&A-Beratung (M&A Consulting) Mergers and acquisitions advisory including due diligence reviews, business valuations, succession planning, economic and tax analysis, and support from company founding through to merger or cooperation.
• Treuhand (Fiduciary Services) Full-service fiduciary offerings encompassing accounting organization and bookkeeping, financial statement preparation, management information systems, payroll administration, social security reporting, and executor mandates.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• EXPERTsuissecoreOthersEXPERTsuisse is the national expert association for auditing, taxes, and trust services in Switzerland. With over 8000 federally certified auditors, tax experts, and trust experts as members, plus 800 companies they manage, EXPERTsuisse members serve companies representing two-thirds of Switzerland's national economic output. Rietmann & Partner is a member, demonstrating commitment to continuing education standards in their profession.

Scale indicators2 records

Recent moves7 records

Expansion highlights4 records

Market position

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInde.linkedin.com/company/dr.-rietmann-&-partner-ag-wirtschaftsprüfer-und-steuerberater

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Rietmann & Partner