We are delighted to announce our very first MGA acquisition of a specialist Marine MGA. A step forward in how we deliver on our ambition to build the world’s most inspiring insurance group, the acquisition of Post & Co represents organic growth as we bring in a business that strengthens what we do and shares how we think.
Post & Co is one of Continental Europe’s most established Marine underwriting businesses, founded in 1918 and still shaped by a long-standing family ownership mindset. Operating from Rotterdam, Groningen, Antwerp and Frankfurt, and working with around 250 brokers across Europe and Asia, it brings both scale and credibility in markets that matter.
Rather than building from scratch, this move gives Aventum an immediate and meaningful presence in Continental Europe - a region central to our future growth ambitions.
Why This Business, Why Now?
Marine is already one of Aventum’s most important classes. Strengthening capability here is intentional. Post & Co adds depth in underwriting authority, claims expertise and broker connectivity.
When combined with Aventum’s existing footprint across the UK, North America and Asia, Post & Co strengthens the Group’s ability to deliver a more connected global Marine proposition. It also opens the door to wider specialty opportunities over time, not through rapid expansion, but through considered, capability-led growth.
Our Cultural Alignment
Beyond numbers and geography, what stood out in this acquisition was our cultural alignment. Post & Co has been built over generations with a clear focus on independence, expertise and long-term relationships. That mindset mirrors our own.
There is a shared belief in backing people, taking ownership and building something that lasts. A strong cultural fit matters, because it is what allows businesses to grow together, not just alongside each other.
For Aventum Group, the acquisition of Post & Co marks an important milestone. It demonstrates our ability to grow selectively through acquisition, reflecting the financial discipline and independence that allow us to act decisively when the right opportunities arise.
Becoming Part of the Group
Post & Co will become part of the Aventum Group, operating under Rokstone. It will remain business as usual for their team, with no changes to leadership, structure or client relationships. Their CEO and leadership team will continue to lead the business and play a key role in shaping our growth across Continental Europe and within Marine. This is how we grow. Thoughtfully. Selectively. Together.
The acquisition reflects a Group that is prepared to grow through selective, high-quality partnerships, and confident enough in its own model to bring other successful businesses into it. Aventum is building something deliberately international, specialist in structure and ambitious in outlook and we look forward to what the future holds with Post & Co part of the Group.
