Mallory Brennan
Partner
Mallory focuses on representing global corporations and financial institutions in mergers and acquisitions litigation and transactional disputes, securities litigation and other complex commercial disputes, including bankruptcy and antitrust actions. She also has experience counseling multinational corporations in connection with both internal and regulatory investigations.
Mallory represents corporates in M&A transactions on both the buy-side and sell-side, as well as financial institutions advising on M&A transactions, including in shareholder class actions, busted deals, post-transaction disputes, and regulatory inquiries. She is experienced in conducting internal investigations into corporate governance irregularities, insider trading, FCPA violations, and other regulatory matters.
Expertise
Industries
Experience
Representative matters
M&A Litigation
Pattern Energy Group in litigation arising out of its acquisition by CPPIB.
Intercontinental Exchange Inc. (ICE) in litigation arising out of its acquisition of Black Knight.
Microvast Holdings Inc. in litigation arising out of its deSPAC transaction with Tuscan.
Published Work
- Co-author, (2024) “6 Focus Areas For Companies Managing The Risks Of AI Use”, Law360
- Co-author, (2023) “Delaware Court of Chancery Grants Plaintiff Attorney’s Fees Award Under Corporate Benefit Doctrine for Demand to SPAC Board Leading to Adjusted Voting Structure in Connection with Merger”, The M&A Lawyer
- Author, (2022) “Delaware Court of Chancery Finds Personal Jurisdiction Over LLC ‘Acting Manager’ in Post-Closing Investor Action Challenging Merger with SPAC”, The M&A Lawyer
- Author, (2022) “Delaware Supreme Court Reverses Dismissal of a Post-Merger Suit for Alleged Breach of Fiduciary Duty Related to Disclosures on Appraisal Rights”, The M&A Lawyer
Speaking Engagements
- Co-Presenter, The Evolving Landscape of ESG Litigation, University of Texas School of Law/The Review of Litigation Symposium: The ESG Legal Landscape, February 2024
- Co-presenter, Social Media and AI – Ethical Guidelines for Lawyers, Texas General Counsel Forum, May 2023
- Panelist, Taking & Defending Powerful Depositions, The Rossdale Group, July 2020
Leadership Positions And Professional Affiliations
- Board of Directors, French American Chamber of Commerce – Texas
- Board of Directors, American Association for the International Commission of Jurists
- Member, New York State Bar Association
Awards
- Up & Coming in Securities Litigation – Texas, Chambers USA, 2022-2023
- Next Generation Lawyer for M&A Litigation Defense, The Legal 500, 2017-2023
- Top Ten Most Influential Securities Litigation Lawyers in Texas, Business Today, 2023
- 40 & Under Hot List, Benchmark Litigation, 2018-2020
- Rising Star, New York Law Journal
- Rising Star, Euromoney Legal Media Group
Qualifications
Admissions
Texas, 2021
New York, 2008
New York, 2008
Courts
United States District Courts for the Southern and Eastern Districts of New York
United States District Court for the Eastern District of Michigan
United States Court of Appeals for the Fifth Circuit
United States District Court for the Eastern District of Michigan
United States Court of Appeals for the Fifth Circuit
Academic
B.S., Millsaps College, 2002
J.D., Seton Hall University, 2007
J.D., Seton Hall University, 2007
Languages
French
Disclaimer
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.