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Ostrum Asset Management* is a société anonyme (S.A.) under French law with a board of directors and a chief executive officer. The Ostrum Asset Management's board of directors is chaired by Jean Raby.

* Natixis Asset Management became Ostrum Asset Management in April 2018. Natixis Asset Management was formed following the merger of Natexis Asset Management and Ixis Asset Management. Natexis Asset Management, established in 1998, was Banque Populaire’s asset management company, while Ixis Asset Management, set up in 1984, was Caisse d’Epargne’s asset management company.

The Ostrum Asset Management's executive committee gathers:

  • Matthieu Duncan, CEO
  • Valérie Derambure, Deputy CEO in charge of Finance and Operations
  • Ibrahima Kobar, Deputy Chief Executive Officer, Global CIO
  • Emmanuelle Portelle, Head of Permanent Control, Compliance and Risk
  • Sylvie Soulère Guidat, Head of Human Resources
  • Lientu Lieu, Head of Business Strategy

Matthieu Duncan



Matthieu Duncan began his career in the financial industry at Goldman Sachs, where he held various positions within capital markets activities of the firm in Paris and London between 1990 and 2003. From 2004 to 2015, he held various positions in the asset management sector in London: Chief Investment Officer (CIO) Equities at Cambridge Place IM, Head of Business Strategy and member of the Board of Directors of Newton IM (a Bank of New York Mellon company), and Chief Operating Officer (COO) and member of the Board of Directors of Quilter Cheviot IM.
A dual French and US citizen, Matthieu completed his MBA degree at the University of Texas (Austin) and his BA degree in Business Economics at the University of California (Santa Barbara).

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Valérie Derambure

Deputy CEO in charge of Finance and Operations

Deputy CEO in charge of Finance and Operations

Valérie Derambure began her career in 1986 at Deloitte Audit before joining Groupe CPR at the end of 1988, first as project manager and then as Head of Finance Control. In 1994, she was appointed Financial Director of the group’s American subsidiary in New York. She next worked as Finance Control Director at CIC Paris, then at CDC IXIS Capital Markets and joined Natixis in 2004 first as Finance Control Director and then as Deputy Financial Director. In 2009, Valérie was appointed Head of Organization and Operational Efficiency. She joined Banque Privée 1818 in 2011 as Deputy CEO in charge of Finance, Risks, Human Resources and Corporate Secretariat. Valérie Derambure has been appointed Deputy CEO in charge of Finance and Operations for Natixis Asset Management and member of its Executive Committee, with effect as of April 3 2017.
Valérie Derambure is a graduate of ESCP business school.

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Ibrahima Kobar

Deputy Chief Executive Officer, Global CIO

Deputy Chief Executive Officer, Global CIO

Ibrahima Kobar began his career in 1989 as statistician at the economic, banking and financial research at Société Générale. In 1991, he joined Midland Bank where he acted as actuary/fixed-income manager.
In 1994, Ibrahima Kobar joined Ixis Asset Management as insurance portfolio manager in the bond management department. In 1998, he was appointed head of insurance management, derivatives and structured products.
In 2007, he became head of bond management and, in 2010, CIO Fixed-income at Natixis Asset Management and member of the Executive Committee.
Since 2017, he is Deputy Chief Executive Officer and Global CIO.

Ibrahima Kobar is an actuary with a degree from Institut de Statistiques de Paris (ISUP) and is a member of Institut des Actuaires Français (IAF). He is also Chartered Financial Analyst (CFA).

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Emmanuelle Portelle

Head of Permanent Control, Compliance and Risk

Head of Permanent Control, Compliance and Risk

Emmanuelle Portelle started her career in 1987 at Coca Cola in management control before joining the Banque Internationale de Placement in 1988 as an arbitrage trader on the European rate market. She then joined the Caisse des Dépôts et Consignations from 1993 to 2005 where she held various positions such as bond market maker, risk controller, and fixed income monitoring on the trading floor, as well as Internal Auditor for the Group focusing on market activities and asset management. In 2005, she joined Natixis Investment Managers as Senior Compliance Officer for French entities. She was then appointed Deputy Head of Compliance, Risk Management, and Internal Audit for Europe. Her role was eventually extended to also cover Asia in 2012. In 2017, her position evolved to include the coverage of the private equity business for aspects relating to compliance, risk management, and internal audit.

Emmanuelle holds a Bachelor in Business Administration from the MBA Institute of Paris and a Master of Business Administration from George Washington University in Washington, D.C.

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Sylvie Soulère Guidat

Head of Human Resources


Head of Human Resources

Sylvie Soulère Guidat started her career at Crédit Lyonnais in 1988, where her posts included business analyst and project manager at Capital Markets.

She then joined Caisse des dépôts et consignations, where she was Head of Project Management and then Corporate Secretary for Asia in Tokyo.

In 2000, Sylvie moved to what would later become Natixis, as Corporate Secretary for CDC Ixis Securities, then Deputy Head of Human Resources for CDC Ixis CIB, followed by Head of Human Resources for Asia in Tokyo, and subsequently Head of Human Resources for CIB in Paris, before being appointed Corporate Secretary for the Corporate & Investment Banking Asia-Pacific platform in Hong Kong in 2010. Sylvie became Head of Human Resources for Natixis Asset Management in 2017.

Sylvie Soulère-Guidat, aged 53, is a graduate of the École Nationale Supérieure d’électronique, électrotechnique, informatique et hydraulique in Toulouse.

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Lientu Lieu

Head of Business Strategy

Lientu Lieu began her career in 2004 at At Kearney (strategy consulting firm) as a Senior consultant. She then joined Natixis Asset Management in 2008, where she held the position of Head of strategy and General secretary of the executive committee.

In 2017, Lientu Lieu has been appointed Head of Business Strategy of Natixis Asset Management, in charge of strategy and overall commercial development, in close coordination with Natixis Investement Managers’ distribution platform. She is a member of Ostrum Asset Management’s executive committee.

Lientu Lieu is a graduate of the École Supérieure de commerce de Paris (ESCP-EAP business school). She also completed the Program for Leadership Development (PLD19) of the Harvard Business School.

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On 3 April 2018, Natixis Asset Management became Ostrum Asset Management.