Kelly Petrillo joined Ropes & Gray in 2021 as an associate in the merger & acquisitions and capital markets groups. Her practice focuses on transactional matters, representing clients in mergers & acquisitions, joint ventures, capital markets transactions and other strategic transactions. She also advises clients on securities law reporting and compliance obligations and corporate governance matters. During law school, Kelly served as a notes editor for the Columbia Law Review and worked with asylum seekers through Columbia Law School's Immigrants' Rights Clinic.


  • Represented Adaptimmune Therapeutics plc in its strategic combination with TCR2 Therapeutics Inc.
  • Represented GI Partners in its $1.05 billion acquisition of Atlas Technical Consultants, a leading provider of infrastructure and environmental solutions.
  • Represented Pfizer Inc. in its $11.6 billion acquisition of Biohaven Pharmaceuticals, the maker of NURTEC ODT, an innovative dual-acting migraine therapy approved for both acute treatment and episodic prevention of migraine in adults.
  • Represented GI Partners in its take-private of GTY Technology, a NASDAQ-listed SaaS company offering a cloud-based suite of solutions for state and local governments, education institutions and healthcare organizations.

Areas of Practice