Ostrum Asset Management welcomes Gaëlle Théaud-Gautheron as Chief Operating Officer

Ostrum Asset Management (Ostrum AM), an affiliate of Natixis Investment Managers, announces the appointment of Gaëlle Théaud-Gautheron as Chief Operating Officer (COO). She will assume her role on July 1, 2024.


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Member of Ostrum AM’s executive committee and reporting directly to Olivier Houix, CEO, Gaëlle Théaud-Gautheron, as Chief Operating Officer, will be tasked with optimizing the organization and efficiency of key processes supporting Ostrum AM's asset management activities and client service. She will also ensure coordination with Natixis Investment Managers teams, as well as all external service providers, and will support commercial and contractual relationships. Finally, Gaëlle will coordinate Ostrum AM's transformation initiatives.

Olivier Houix, CEO of Ostrum AM, said: "We are delighted to welcome Gaëlle to Ostrum AM, whose extensive experience in global transformation management will be a valuable asset for Ostrum AM in supporting our development ambitions. Her knowledge of Groupe  BPCE and her consulting expertise made her the ideal candidate to optimize and streamline the relationship between Ostrum AM's teams and our providers within the Group, as well as externally."


  • Gaëlle Théaud-Gautheron

    Gaëlle Théaud-Gautheron

    Chief Operating Officer

Gaëlle Théaud-Gautheron has over 20 years of expertise in the financial sector: after starting her career in 2000 at consulting firm Bearing Point as a consultant and then manager in the "financial services" practice, she joined Société Générale CIB in 2005; she worked there until 2019, within the Chief Operating Office, and then as the global head of market operations. She left Société Générale CIB to found Théa Conseil, a consulting firm specializing in business consulting and change management. In 2021, Gaëlle joined the BPCE Group as Co-Head of Organization and Transformation, and then as Managing Partner - Transformation Management Office at Natixis Global Financial Services.

Gaëlle Théaud-Gautheron, 47, graduated from NEOMA Business School with a specialization in finance.

About Ostrum Asset Management

Ostrum Asset Management draws on its investment expertise to enhance the impact of its clients’ commitments as they act together to support European citizens’ life plans, health and retirement. 
Ostrum Asset Management is among the European leaders1 in institutional asset management, providing support to its clients operating under liability constraints across the entire investment value chain with a range of insurance-based (equities and bonds), fixed income, and quantitative management offerings, combined with a dedicated set of service offerings.

Ostrum Asset Management is a well-established responsible investment advocate2 and manages €402 billion3 in assets for large institutional clients – insurers, pension funds, health insurers, corporations.
Ostrum Asset Management is an affiliate of Natixis Investment Managers.

Asset management company regulated by AMF under n° GP-18000014 – Limited company with a share of 50 938 997 €. Trade register 525 192 753 RCS Paris – VAT : FR 93 525 192 753. Registered office: 43, avenue Pierre Mendès-France – 75013 Paris – www.ostrum.com

1 IPE Top 500 Asset Managers (Investment & Pensions Europe) 2023 ranked Ostrum AM as the 9th largest asset manager, as at 12/31/2022. Any reference to a ranking, a rating or an award provides no guarantee for future performance.
2 Ostrum AM was one of the first French asset manager signatories to the PRI in 2008. More details; www.unpri.org
3 Source: Ostrum Asset Management, consolidated data at end-March 2024. Administered assets include Ostrum AM's assets. The services provided for a given client may concern certain services only.

About Natixis Investment Managers

Natixis Investment Managers’ multi-affiliate approach connects clients to the independent thinking and focused expertise of more than 15 active managers. Ranked among the world’s largest asset managers1 with more than $1.3 trillion assets under management2 (€1.2 trillion), Natixis Investment Managers delivers a diverse range of solutions across asset classes, styles, and vehicles, including innovative environmental, social, and governance (ESG) strategies and products dedicated to advancing sustainable finance. The firm partners with clients in order to understand their unique needs and provide insights and investment solutions tailored to their long-term goals.

Headquartered in Paris and Boston, Natixis Investment Managers is part of the Global Financial Services division of Groupe BPCE, the second-largest banking group in France through the Banque Populaire and Caisse d’Epargne retail networks. Natixis Investment Managers’ affiliated investment management firms include AEW; DNCA Investments3; Dorval Asset Management; Flexstone Partners; Gateway Investment Advisers; Harris Associates; Investors Mutual Limited; Loomis, Sayles & Company; Mirova; MV Credit; Naxicap Partners; Ossiam; Ostrum Asset Management; Seventure Partners; Thematics Asset Management; Vauban Infrastructure Partners; Vaughan Nelson Investment Management; and WCM Investment Management. Additionally, investment solutions are offered through Natixis Investment Managers Solutions and Natixis Advisors, LLC. Not all offerings are available in all jurisdictions. For additional information, please visit Natixis Investment Managers’ website at im.natixis.com | LinkedIn: linkedin.com/company/natixis-investment-managers.

Natixis Investment Managers’ distribution and service groups include Natixis Distribution, LLC, a limited purpose broker-dealer and the distributor of various US registered investment companies for which advisory services are provided by affiliated firms of Natixis Investment Managers, Natixis Investment Managers S.A. (Luxembourg), Natixis Investment Managers International (France), and their affiliated distribution and service entities in Europe and Asia.

1 Cerulli Quantitative Update: Global Markets 2023 ranked Natixis Investment Managers as the 17th largest asset manager in the world based on assets under management as of December 31, 2022. 
2 Assets under management (“AUM”) of current affiliated entities measured as of March 31, 2024, are $1,321.9 billion (€1,224.9 billion). AUM, as reported, may include notional assets, assets serviced, gross assets, assets of minority-owned affiliated entities and other types of non-regulatory AUM managed or serviced by firms affiliated with Natixis Investment Managers. 
3 A brand of DNCA Finance.

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