Sebastian Tiller

Partner

Mergers & Acquisitions and Capital Markets

“The most gratifying aspect of my practice is to help clients achieve their goals. It’s all about identifying issues and resolving them in a manner to promote my client’s objectives, which often requires a great deal of creativity.”

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Overview

Sebastian Tiller is Head of Vinson & Elkins’ Strategic Mergers & Acquisitions practice. Sebastian represents corporations, private equity firms and financial advisers in a range of mergers & acquisitions transactions and corporate governance matters. He has deep experience representing public and private companies in multi-billion dollar strategic mergers & acquisitions and has closed high-profile transactions in the financial services, technology, energy and consumer goods industries, among others.

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Experience

  • GardaWorld in its acquisitions of OnSolve, WorldAware, Whelan Security and Stealth Monitoring, and in its C$5.2 billion recapitalization by BC Partners and subsequent C$13.5 billion recapitalization by members of management and HPS Investment Partners

  • Clariant AG in its $810 million acquisition of Lucas Meyer Cosmetics

  • L3Harris in its $1 billion partnership with the US Department of War, $845 million sale of a controlling interest in its Space Propulsion and Power Systems business, $4.7 billion acquisition of Aerojet Rocketdyne and $33.5 billion merger with Harris Corporation

  • Corsair Capital in its acquisitions of TreviPay and investments in Miracle Mile Advisors, HungerRush, Aurora Payments, IDIQ® and Oakbridge Insurance Agency

  • The Mosaic Company in its agreement to sell its stake in Ma’aden Wa’ad Al Shamal Phosphate Company to Ma’aden and acquisition of the Vale Fertilizantes business from Vale S.A. for an aggregate purchase price of $2.1 billion

  • TCF Financial Corporation in its $22 billion merger with Huntington Bancshares Incorporated and $3.5 billion merger of equals with Chemical Financial Corporation

  • People’s United Financial in its $7.6 billion merger with M&T Bank Corporation

  • Ahold in its $29 billion merger of equals with Delhaize Group

  • Lorillard in its $29.25 billion sale to Reynolds American

Credentials

Education

  • Ludwig-Maximilians-Universität München, Dr. jur. summa cum laude (German Ph.D. equivalent), 2005
  • New York University School of Law, LL.M (Arthur T. Vanderbilt Scholar), 2005
  • Bavarian State Ministry of Justice, München, Second State Examination, 2003
  • Bavarian State Ministry of Justice, München, First State Examination (German J.D. equivalent), 2001
  • Université Paris II-Panthéon Assas, Licence en Droit, Mention Tres Bien, 1998

Admissions

  • New York
  • Germany

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Recognitions

  • Legal 500 U.S., M&A/Corporate & Commercial: Private Equity Buyouts, 2025; M&A/Corporate & Commercial: M&A: Large Deals (1bn+), 2026
  • IFLR1000 “Notable Practitioner” in M&A, 2024
Insights

Articles

5 Strategies for Effective AI Governance

1. Map the Risk Landscape Effective AI governance begins with a comprehensive, clear-eyed assessment of where and how the company …

May 26, 2026

May 26, 2026 • 2-minute read

Client Alerts

Delaware Court of Chancery Upholds Removal of “Imperious” CEO Under DGCL Section 225

On April 20, 2026, Vice Chancellor J. Travis Laster issued a post-trial opinion in DSM HoldCo, Inc. v. Demoulas, C.A. No. 2025-1020-JTL (Del. Ch. Apr. 20, 2026), an action brought under 8 Del. C. § 225(a) by the parent holding company (the “Company”) of the Market Basket grocery chain, its operating subsidiary Demoulas Super Markets, Inc., and three independent directors—Jay K. Hachigian, Steven J. Collins, and Michael Keyes (the “Current Directors”)—against Arthur T. Demoulas (“Demoulas”), the Company’s longtime President and CEO.

May 18, 2026

May 18, 2026 • 10-minute read

Client Alerts

When Short Sellers Attack

A playbook for preparing for, responding to and mitigating short seller campaigns A “short attack” is a campaign in which …

February 5, 2026

February 5, 2026 • 5-minute read

Client Alerts

White House Executive Order Targets Proxy Advisory Firms and Signals Heightened Regulatory Scrutiny

On December 11, 2025, President Donald J. Trump signed an executive order titled “Protecting American Investors from Foreign-Owned and Politically-Motivated Proxy Advisors.”

December 12, 2025 • V&E Shareholder Engagement Update

December 12, 2025 • 4-minute read

Event Recaps

Fifth Annual Navigating the Annual Meeting and Reporting Season

Our panelists will discuss recent SEC developments that shape—and the practical considerations that inform—the preparation of public companies’ annual reports and annual shareholder meetings.

November 12, 2025

November 12, 2025 • 1-minute read

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News & Achievements