Helping local and international clientele moving their business forward.

OA advises domestic and international clients in matters where structure, regulatory clarity, and strategic judgment are decisive. Based in Türkiye — a jurisdiction positioned at a critical economic and geopolitical crossroads — we serve as a trusted reference point for complex transactions, evolving regulatory frameworks and sensitive disputes.

Our practice spans mergers and acquisitions, financing, tax structuring, compliance and high-stakes litigation. We integrate transactional sophistication with dispute capability to ensure that legal architecture supports capital, governance and long-term commercial resilience across jurisdictions.

We operate as a unified partnership, bringing together complementary disciplines to deliver cohesive and carefully engineered solutions. Our ambition is not defined by scale, but by reliability and experience — to be the firm clients rely on when clarity, precision and institutional steadiness are essential — and when their most consequential decisions demand sound judgment and resilient legal frameworks.

Our Approach

OA’s practice is built on the integration of transactional, regulatory and dispute resolution capabilities. Many of the matters we handle involve overlapping legal and commercial considerations — financing structures, tax implications, governance frameworks and regulatory exposure often intersect within a single transaction or dispute.

By bringing together lawyers with complementary expertise across these areas, we develop legal strategies that address both the immediate legal question and the broader structural consequences for the business.

This approach allows us to structure transactions with foresight, manage regulatory risk with precision and represent clients effectively in complex disputes.

International Work

Based in Türkiye — a jurisdiction positioned at the intersection of Europe, the Middle East and Asia — OA regularly advises international investors, multinational companies and financial institutions on cross-border transactions and disputes.

Our work frequently involves international corporate structures, cross-border financing arrangements and matters involving foreign investors, multinational groups and evolving regulatory frameworks.

By combining local legal insight with international transactional and dispute experience, we assist clients in navigating investments, restructurings and disputes connected to Türkiye and the broader region.

Leadership

OA operates as a unified partnership in which each partner assumes responsibility not only for client work but also for specific aspects of the firm’s institutional development and governance.

The firm is led by Founding Partner and Managing Partner Zekeriya Başar Özbilen, who oversees the firm’s overall strategy, partnership governance and dispute practice.

Within the partnership structure:

Senem Özbilen serves as Finance Partner, responsible for the firm’s financial management and strategic oversight of the tax practice.

Gülbin Murat serves as Growth & Business Partner, focusing on client relationships, business development and strategic growth initiatives.

Cansu Aybıyıklı serves as People Partner, overseeing talent development, professional training and the firm’s internal culture.

İdil Sandıklılı serves as Go-to-Market Partner, responsible for market positioning, international engagement and the firm’s external profile.

This structure reflects OA’s belief that a strong partnership requires both professional excellence and shared responsibility for the firm’s long-term development.