Skip to content

Susan
Carroll Chrysostomou

Partner

Susan is a partner in Matheson’s Corporate M&A Group, with a particular focus on public company transactional, advisory and corporate governance matters.

Susan advises clients on public M&A, redomiciliations and equity capital markets transactions, having particular expertise in advising US and other international clients on cross-border acquisitions of Irish companies, migrations, capital raisings and equity capital markets transactions (undertaken domestically and by Irish companies listed on US and other foreign exchanges).

As a founding member of the firm’s Public Company Advisory and Corporate Governance Group, Susan counsels clients on the full range of corporate governance, compliance, securities laws and advisory matters that arise for both listed Irish public companies and large private companies.

As a leading member of our multi-disciplinary Equity Incentives Group, Susan also counsels clients – public and private, listed and unlisted, domestic and multinational companies – on the full ambit of matters that arise for businesses offering equity-linked remuneration in Ireland.

Prior to joining the Corporate M&A Group, Susan worked in Matheson’s Corporate Restructuring and Insolvency Department.

 

 

Experience and Education

Susan has advised:

  • Horizon Therapeutics plc (a global biotech company) on its US$27.5 billion acquisition by Amgen Inc. by way of scheme of arrangement under the Irish Companies Act and pursuant to the Irish Takeover Rules;
  • Finnish registered MariaDB Corporation Ab on its business combination with NYSE-listed SPAC, Angel Pond Holdings Corporation;
  • Aon (a leading global professional services firm) on its US$38 billion corporate redomiciliation from the UK to Ireland and the listing of the new Irish holding company, Aon plc, on the NYSE;
  • Weatherford International plc, the Irish registered, NYSE listed parent of the Weatherford group of companies, on one of the largest and most complex cross-border corporate restructurings of 2019, and the largest in Irish corporate history. In a highly innovative legal structure, the transaction, which involved a $7.4 billion debt-for-equity swap and refinancing, was implemented through the first ever combined use of the US Chapter 11 bankruptcy process and an Irish examinership restructuring process;
  • Cimpress on its US$3.1 billion corporate redomiciliation from the Netherlands to Ireland and the listing of the new Irish holding company, Cimpress plc, on Nasdaq;
  • Gurnet Point L.P. (a $2 billion healthcare investment fund) on its $209 million public takeover of Innocoll Pharmaceuticals plc (a Nasdaq-listed, global pharmaceutical and medical device company), by way of scheme of arrangement under the Irish Companies Act and pursuant to the Irish Takeover Rules;
  • Nexvet Biopharma plc (a then Nasdaq-listed bio-pharmaceutical company) on its $85 million public takeover by Zoetis (the global leading animal health company with revenues of $4.9 billion), by way of scheme of arrangement under the Irish Companies Act and pursuant to the Irish Takeover Rules;
  • Worldview Capital (a private investment management firm) on its hostile takeover of Petroceltic International plc (then listed on AIM and ESM and engaged in oil and gas exploration) and its subsequent global reorganisation of the Petroceltic group;
  • numerous issuers on issuances of secured and unsecured debt on capital markets;
  • numerous issuers listed on both NYSE and Nasdaq by providing ongoing corporate governance, securities law and takeover law advice; and
  • numerous companies on offering equity-linked remuneration in Ireland.
  • Admitted as a solicitor in Ireland
  • University College Dublin, Master of Laws (Commercial)
  • University College Dublin, Bachelor of Civil Law

News and Insights

Insights
17/04/2025

The Clock is Stopped: The EU Approves Two-Year Delay to CSRD

Read More
Insights
07/04/2025

Irish government supports Omnibus; EP approves two-year delay to CSRD

Read More
Insights
04/03/2025

CSRD: The European Commission Proposes Significant Deregulation

Read More
Insights
10/02/2025

Updates Regarding the Corporate Sustainability Reporting Directive

Read More
Insights
30/09/2024

Corporate Governance and Directors’ Duties in Ireland: Overview

Read More
Insights
08/08/2024

Ireland’s New Mandatory Sustainability Reporting Regulations Come Into Effect

Read More
Insights
24/07/2024

Ireland Publishes New Sustainability Regulations

Read More
News
24/01/2024

Matheson Adds Five New Partners

Read More
Insights
15/03/2023

Corporate Governance and Directors’ Duties in Ireland 2023

Read More
Insights
12/12/2022

Matheson LLP Advises Horizon Therapeutics plc on its Proposed $28 Billion Acquisition by Amgen Inc.

Read More

Accolades

Susan Carroll Chrysostomou is named a Next Generation Partner.

Commercial, Corporate and M&A: The European Legal 500

2024

© 2025 Matheson LLP | All Rights Reserved