About

Costanza Posarelli is an attorney with Sullivan & Cromwell LLP in London, where she practices in the area of general practice. Based in EC4A 1AN, she serves clients with a disciplined, client-focused approach grounded in strong legal analysis, clear communication, and careful attention to detail. Her work reflects the high standards associated with a leading international law firm, and she is committed to helping clients navigate a broad range of legal matters with confidence and efficiency. As a general practice attorney, Ms. Posarelli brings versatility and responsiveness to her role, supporting clients across matters that may require practical judgment, strategic thinking, and a broad understanding of the legal landscape. She is known for her professionalism and for approaching each matter with precision and discretion, always focused on delivering clear guidance tailored to the client’s objectives. Whether addressing routine concerns or more complex issues, she works to provide dependable legal support that is both thoughtful and effective. Ms. Posarelli is admitted to practice under Bar Number 5543889. Through her work at Sullivan & Cromwell LLP, she continues to build a reputation for sound legal judgment and dedicated client service in London and beyond.

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