About us

AbmaDiepenhorst is an accounting firm located in the Groot Handelsgebouw, next to Rotterdam Central Station.


The firm was founded by Joost Abma and Leon Diepenhorst. Social, street smart and astute. Experienced chartered accountants with strong views to advise.


Their time at university was the starting point of a close friendship and of years of working together within the profession. A distinguished duo was born. AbmaDiepenhorst is the result of their shared dream. Building a modern and high-quality accounting firm.


The firm stands out both in its commitment to quality and its human-centered character. Based on energetic relationships and genuine engagement.


The firm has a multidisciplinary team with an extensive network and is affiliated with the Royal Netherlands Institute of Chartered Accountants.