Hannah Bannister
Biography

Hannah is an associate in Weil’s Antitrust practice in London. She advises on all aspects of EU and UK competition law including merger control, foreign subsidies, and general counselling and compliance.
Representative experience as part of a team includes advising:
- ChampionX on its $7.8 billion sale to Schlumberger.
- The Boeing Company on its $8.3 billion acquisition of Spirit AeroSystems.
- Microsoft on its investment in OpenAI.
- Microsoft on its $68.7 billion acquisition of Activision Blizzard, Inc.
- Brookfield on its £3.3 billion sale of Student Roost.
Latest Thinking, Firm News & Announcements
Latest Thinking
- Let’s Keep Talking: Major UK Merger Procedural Reforms Promise Better Engagement And Transparency For Complex Deals Alert — Antitrust — By Jenine Hulsmann, Nafees Saeed and Hannah Bannister — PDF — December 2023
Firm News & Announcements
- Weil Advises Advent on the £3.8B Recommended Cash Offer for Spectris Deal Brief — June 24, 2025
- Weil Advises Microsoft in CMA Investigation into Partnership with OpenAI Deal Brief — March 06, 2025