About us

Since 1936 Callens, Pirenne, Theunissen & C° has been a major player in Belgium’s top 10 audit and accountancy firms. Its success can mainly be attributed to the following strong points:
A sector-oriented Approach
Our company works with multidisciplinary teams that are familiar with your sector's specific features. We have tailor-made solutions appropriate for the financial sector, industry, non-profit organisations and public authorities.
A Personal Approach
Those who regularly use the services of audit or accountancy firms expect the assigned staff member to have a thorough knowledge of the file and to follow it through from start to finish. Callens, Pirenne, Theunissen & C° attaches great importance to continuity and personal approach.
An International Network
Callens, Pirenne, Theunissen & C° is affiliated with Crowe Global and therefore can also provide the best possible support to organisations operating on the international market. With 33.000 staff in over 130 countries Crowe Global ranks among the 10 biggest accountancy networks worldwide.
Integrity and Independence
Due to the changes to the regulations and as a result of external pressure for sound Corporate Governance, business people are more than ever looking for service providers other than the "Big Four" to ensure reliable and independent services. Callens, Pirenne, Theunissen & C°'s integrity and independence are generally highly valued.

About us

Our people

Our people

Our offices

Our offices

Our values

Our values

Our challenges

Our challenges

Our accreditations

Our accreditations

Our network

Our network

Transparency report

Transparency report

Our people

Our people

Our offices

Our offices

Our values

Our values

Our challenges

Our challenges

Our accreditations

Our accreditations

Our network

Our network

Transparency report

Transparency report

Contact us

Philip Callens
Philip Callens
International Liaison Partner
Callens, Pirenne, Theunissen & Co.