About Hallström OstermeyerA firm for
A firm for
business questions.
Hallström Ostermeyer advises corporate clients, shareholders and management bodies on business law. Four offices, coordinated teams and a clear appreciation of commercial realities.
Portrait of Dr. Katharina Hallström
In a meeting room, facing the camera
Factual, approachable
In a meeting room, facing the camera
Factual, approachable
“First we put the facts in order. Only then is it worth talking about contracts.”
Dr. Katharina Hallström Dr. Katharina Hallström founded the firm in Berlin together with Dr. Jonas Ostermeyer. She advises companies and their shareholders on reorganisations, investments and acquisitions.
Before founding the firm, she spent several years at a large business law firm. There she learned how transactions are organised, and how much effort is lost when responsibilities remain unclear. That experience still shapes the way Hallström Ostermeyer works.
Her second focus is IT and data protection law, particularly where data forms part of a transaction. Her doctoral thesis dealt with the liability of management. She speaks regularly on business succession and is responsible for the training of associates in the Berlin office.
Before founding the firm, she spent several years at a large business law firm. There she learned how transactions are organised, and how much effort is lost when responsibilities remain unclear. That experience still shapes the way Hallström Ostermeyer works.
Her second focus is IT and data protection law, particularly where data forms part of a transaction. Her doctoral thesis dealt with the liability of management. She speaks regularly on business succession and is responsible for the training of associates in the Berlin office.
Portrait
Jonas Ostermeyer
Factual, friendly, office
Jonas Ostermeyer
Factual, friendly, office
“Disputes are not solved by escalation, but by establishing clear legal boundaries.”
Dr. Jonas Ostermeyer Dr. Jonas Ostermeyer founded the firm in Berlin together with Dr. Katharina Hallström. He represents companies, shareholders and corporate officers in commercial disputes and corporate law matters.
He previously spent many years as a litigation lawyer at a major business law firm, handling court and arbitration cases. That experience established his view that protracted court proceedings can often be avoided when facts are examined objectively from the outset.
Alongside trial work before German courts, he regularly advises on shareholder disputes and post-closing transaction claims. He holds a doctorate in commercial arbitration and oversees the dispute resolution practice across the firm's offices.
He previously spent many years as a litigation lawyer at a major business law firm, handling court and arbitration cases. That experience established his view that protracted court proceedings can often be avoided when facts are examined objectively from the outset.
Alongside trial work before German courts, he regularly advises on shareholder disputes and post-closing transaction claims. He holds a doctorate in commercial arbitration and oversees the dispute resolution practice across the firm's offices.
Four principles for dependable legal advice
Principle 01
Facts first
We start with your records and actual operating procedures. Only once the factual foundation is clear do we formulate strategic legal recommendations.
Principle 02
Dedicated partner lead
A partner holds personal responsibility for your matter. You always know who is working on your file and whom to contact.
Principle 03
Predictable fees
We agree scope, timetable and fee arrangements in writing beforehand. If parameters change, we raise adjustments early.
Principle 04
Practical utility
Legal advice should enable commercial decisions rather than stall them. We deliver clear documents, negotiated contracts and practical guidance.
Four offices across Germany
With offices in Berlin, Frankfurt, Munich and Hamburg, we advise mid-sized companies nationwide. Our teams work together across locations.
Head office
Berlin
Berlin-Mitte
+49 30 0000 0000
berlin@hallstroem-ostermeyer.example
+49 30 0000 0000
berlin@hallstroem-ostermeyer.example
Office
Frankfurt
Frankfurt-Westend
+49 69 0000 0000
frankfurt@hallstroem-ostermeyer.example
+49 69 0000 0000
frankfurt@hallstroem-ostermeyer.example
Office
Munich
München-Maxvorstadt
+49 89 0000 0000
muenchen@hallstroem-ostermeyer.example
+49 89 0000 0000
muenchen@hallstroem-ostermeyer.example
Office
Hamburg
Hamburg-HafenCity
+49 40 0000 0000
hamburg@hallstroem-ostermeyer.example
+49 40 0000 0000
hamburg@hallstroem-ostermeyer.example
How we work
In four steps.
Every instruction follows an orderly framework. From initial review to follow-up, we work transparently alongside your corporate leadership.
01
Clarify
We analyse the facts, examine existing agreements and clarify the commercial objectives of your business.
Initial review and factual appraisal
→02
Plan
We establish work packages, lead contacts and fee models, providing a dependable roadmap for the collaboration.
Scope of engagement and timetable
→03
Deliver
We draft agreements, lead commercial negotiations and represent your interests before public authorities, notaries or courts.
Drafting and negotiation
→04
Support
Following completion, we summarise results, record ongoing deadlines and assist with operational rollout across the business.
Closing summary and deadline list
These steps connect logically: careful analysis provides the foundation for reliable planning, disciplined execution and lasting results in daily business.
Next step
Talk to
us.
us.
Outline your upcoming matter. In an initial conversation, we clarify how we can help and who on our team will take charge.
For whom
For mid-sized enterprises, family companies and corporate leadership teams seeking reliable legal frameworks for commercial decisions.
Typical trigger
A restructuring is planned, commercial contracts require renegotiation or a dispute is emerging. Early advice widens room for manoeuvre.