Guillaume Isautier

Guillaume Isautier


Guillaume advises domestic and international clients in a wide variety of M&A transactions, including purchases and sales of listed and non-listed companies, strategic mergers and joint ventures, as well as business carve-out acquisitions and divestitures.

His practice focuses on a broad range of industry sectors including banking, telecom, energy and consumer good & retail sectors.

He also regularly represents private equity funds.


Representative matters

A subsidiary of a global financial institution on its exclusive negotiations with Neuflize OBC to form strategic partnership in life insurance in France.
Guillaume Isautier is very smart in how he approaches negotiations. He is not looking for conflict; rather, he looks to find solutions. He knows how to handle complexity and adversity, as well as how to adapt to make the deal work.
Band 4 - Chambers Global 2024 (Corporate/M&A: High-end capability)
He is a lawyer we appreciate a lot and have a lot of trust in.
Band 4 - Chambers Global 2024 (Corporate/M&A: High-end capability)



Paris Bar, 2000


Post Graduate Degree, International Commercial Law, University Paris X Nanterre, 1998

LL.M, Taxation, Golden Gate University, San Francisco, 1997

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.