Ariane Slinger

Location: Geneva, Switzerland,
Expertise: Corporate Trustees, Private Client Trustees,

Shortlisted

Magic Circle Awards - 2026

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IFC Awards - 2026

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Future Leaders Awards - 2025

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Brand & Marketing Awards - 2026

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Powerwomen Inernational Awards - 2025

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Powerwomen USA Awards - 2025

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Latest Article

60 second interview with Ariane Slinger, ACE International

Citywealth spoke to Ariane Slinger, CEO of ACE International SA to discuss special assignments, hand-holding clients and her love for vinyl records.

Read more

Latest Review

Private Client review:
I would like to express my heartfelt gratitude to Ariane Slinger for her unwavering commitment and extraordinary support for migrants and refugees around the world. Ariane brings not only deep expertise and leadership to her professional role but also a profound sense of compassion and responsibility toward the most vulnerable. Her dedication to social impact goes far beyond words—it is consistently reflected in meaningful actions that have improved countless lives. Thank you, Ariane, for being a steadfast ally in the cause of human dignity and justice. Your work is truly an inspiration.
25 Jul 2025

Profile

Ariane Slinger is a trustee and the CEO and main owner of ACE International SA in Geneva that she acquired through the MBO of the Swiss subsidiary of the British banking Group Rathbones in 2009. After having worked as a lawyer in Monte Carlo for 3 years she started her career in the Trust industry at CITCO Group in Amsterdam in 1991. Shortly after she became the Managing Director of the Luxembourg operation and during her 12 years within the CITCO Group she also reorganised the Geneva offices and set up the Monegasque operations. After a two years experience with the AMICORP Group she accepted in 2004 the position of Managing Director at Rathbone Trust Company SA in Geneva prior to acquiring the business and changing its name to ACE International SA, Advice & Corporate Engineering.
Ariane holds Law Degrees in Corporate, Commercial and International Law. She is an international lawyer with 30 years of expertise in International Corporate Structures, Estate Planning, Trusts and Foundations of all kinds for a worldwide corporate and private clientele. She has been Vice President of the Swiss Association of Trust Companies SATC since 2018.
http://www.satc.ch/organisation/who-we-are/

I have worked with Ariane for more than ten years on a number of clients and files. I can attest that she and her team at ACE have always worked diligently , showed a constructive approach and were able to provide solutions which were efficiently and smoothly implemented. As a trustee, Ariane can be relied on in any circumstances which is particularly appreciated in the volatile environment surrounding the trusts especially in an international environment.

Contact

Place de Saint-Gervais 1
1201 Geneva
Switzerland

Reviews

Private Client review:
I would like to express my heartfelt gratitude to Ariane Slinger for her unwavering commitment and extraordinary support for migrants and refugees around the world. Ariane brings not only deep expertise and leadership to her professional role but also a profound sense of compassion and responsibility toward the most vulnerable. Her dedication to social impact goes far beyond words—it is consistently reflected in meaningful actions that have improved countless lives. Thank you, Ariane, for being a steadfast ally in the cause of human dignity and justice. Your work is truly an inspiration.
25 Jul 2025
Private Client review:
I have known Ariane for many years and I have always been impressed by the professionalism and the attention to details and care that she provides her customers with.
23 Jun 2025
Peer review:
Ariane is an outstanding advisor to her clients and is always committed to finding the right solutions for them .
19 Jun 2025
Peer review:
Ariane présente une combinaison assez rare: l’enthousiasme, la ténacité, la compétence.
Tripet - Cabinet Tripet
18 Jun 2025
Institutional Client review:
I have had the opportunity to collaborate with Ariane Slinger and her team at ACE International SA for over a decade across multiple client matters. Ariane consistently demonstrates deep technical expertise, sound judgment, and an unwavering commitment to client service. Her solutions are always well-structured and efficiently executed, even in complex cross-border trust and estate planning matters. Ariane is reliable, pragmatic, and delivers with discretion and integrity—qualities that are critical in today’s shifting international landscape. She is a trusted professional I fully endorse.
17 Jun 2025
Private Client review:
Translation: Ariane is always attentive and available when needed. Ariane is always looking for the best solution whenever I ask her. Her efficiency and competence are exceptional. Her personality and understanding of my problems, as well as their rapid resolution, allow me to say that I consider myself privileged to have Ariane Slinger as manager of the Family Trust. Ariane is one of those rare people you can trust 100%. Erick Cl.
16 Jun 2025
Institutional Client review:
I have been working with Ms. Arian Slinger for over fifteen years. Beyond her warm and professional welcome, she and her team have always been able to connect with clients who are not always familiar with the world of finance and services, offering solutions that are perfectly tailored to their needs. She takes every action to heart, striving to defend her clients' interests to the best of her ability. Thank you for your invaluable help.
Roland Asmar - Foundation-Medical Research Institutes (F-MRI)
16 Jun 2025
Peer review:
Very helpful and knowledgeable in the sector with significant experience.
FOTIS MAVROKEFALOS - FATHOM WMA
15 Jun 2025
Private Client review:
Ariane has been a very professsional, reliable advisor and Trustee for over 20 years and we will continue this special relationship.
15 Jun 2025
Co-worker review:
She’s wonderful. Very hard working and inspirational.
14 Jun 2025
Institutional Client review:
Institutionally: competent, diligent, attentive to detail, as well as the client’s issues. Innovative in solutions Personally: dedicated, friendly, attentive, motivated by the personal links Summary: great! I recommend.
Marc Odendall - Order of Malta
13 Jun 2025
Peer review:
Ariane combines comptence, tenacity and enthusiasm
Tripet - Cabinet F Tripet et associés
13 Jun 2025
Institutional Client review:
Great professional: competent, attentive to detail, dedicated to the client needs. Great personal skills: friendly, funny, pleasant. I recommend
13 Jun 2025
Private Client review:
Ariane delivers a high level of service to its clients. Inventive and attentive to the needs of its clients, Ariane knows how to adapt to the demands of a discerning and high-level clientele.
13 Jun 2025
Institutional Client review:
ACE International is a top level company in trustee business. They have a very good reputation both in Switzerland and in the rest of the world' I warmly recommend this company.
Bordes - Ex AEquo
02 Oct 2024
Institutional Client review:
Trustee reliable, committed, efficient. Exceptional and enthusiastic personality.
Pascal-AndrÈ Dumont - CommunautÈ Saint-Martin
01 Oct 2024
Institutional Client review:
Ariane is a dynamic and combative trustee.
David Wilson - Schellenberg Wittmer
16 Nov 2022
Private Client review:
I am pleased to give the highest recommendations of professionalism and efficiency to Mrs. Ariane Slinger, CEO, ACE International SA. It is always a pleasure to collaborate and receive her expert advice on complicated tax and business matters with a speedy feed-back and response. I look forward to further and future collaborations and client relations with Ariane and remain
With Sincere regards, Inge Leutscher, President, EXCELLENCE International SA.
Inge Leutscher - EXCELLENCE International SA
17 Oct 2022
Institutional Client review:
Through the help of ACE International and Ariane, we were able to help 3012 migrant fishers in 2020.
Ansensius Guntur - Stella Maris International Migrants Service Center
04 Feb 2021
Institutional Client review:
Ariane is a very open, dynamic and positive person, always looking for the common good. I was always impressed by her listening skills and her deep knowledge of the files submitted to her. It's always a pleasure to debate with her.
Dominique Dewulf - The Emmanuel Community
01 Feb 2021
Private Client review:
She has been an excellent leader in this time of pandemic; these are the kinds of people we need to be able to navigate through the daily challenges.
Paulo Prigol - Scalabrini /Stella Maris
31 Jan 2021
Institutional Client review:
Ariane is a competent, dynamic, hardworking, generous and inspirational leader and trustee, always focused on effectiveness, through performance, team strength & flexibility and individual learning. She always looks for practical and efficient solutions for issues in which she is involved.
Leonir Mario Chiarello - Congregation of the Missionaries of Saint Charles, Scalabrinians
29 Jan 2021
Institutional Client review:
Ariane Slinger is always prepared, professional, compassionate and forward thinking. She has the ability to assess individual situations quickly and competently in order to produce dynamic solutions and advice.
Calleen Letaconnoux - Bethlehem University
29 Jan 2021
Institutional Client review:
Ariane has a good heart. She understands cultural, religious and political complexities organizations may experience in responding to the needs of their people. As a highly professional person, Ariane supports and encourages institutions in their programs and expects correct, timely and complete report on how projects are effectively implemented. She strongly believes in the education of the young and the hope they aspire amidst difficulties.
Belayneh Medhanit ( Ed. D) - Bethlehem University
29 Jan 2021
Private Client review:
Ariane has always put us first and works relentlessly to help us achieve our project.
Ace team and herself are very supportive and focus on finding viable solutions to their client needs.
Their good advices and dedication make them a remarkable asset to anyone looking to navigate safely our economical and financial environnement.
They have my trust and thanks.
Bertrand Charlier de Vrainville - N/A
20 Mar 2020
Peer review:
An inspirational leader with bags of energy, ideas, drive and focus
Mark luboff - Rathbones
14 Dec 2019
Institutional Client review:
An excellent professional with good spirit and always keen to learn and understand the client's work and mission.
Andrea Atzori - Cuamm
24 Nov 2019
Peer review:
Mrs Slinger is a great professionnal, extremely competent in her field and always very attentive to serve her clients in their best interests.
patrick cattin - BDO SA
21 Nov 2019
Peer review:
Ariane is a very professional person, but also very human. A person of integrity and trustworthiness who follows a straight line of conduct. Always a pleasure to work with her.
Taulant Avdija - BDO
21 Nov 2019
Institutional Client review:
Excellent advisor
Perez - UBS
21 Nov 2019
Peer review:
Questions are addressed in a timely manner with a high level of professional approach.

Fees are reasonable and services rendered are worth it.

We are working together for over 10 years now, and level of satisfaction is always high.
Alain Noullet - Initium Corporate Services
20 Nov 2019
Institutional Client review:
Knowledgeable, reactive, creative, rigorous and entrepreneurial.
Julien - JP Conseil
21 Oct 2019
Institutional Client review:
She deserves the award.
Rev, farther prosper Kwaku - IMass innovation
18 Oct 2019
Institutional Client review:
I know Ariane since many years and I must say that I have rarely seen such a dynamic, competent and hardworking trustee. Apart from her very positive character, Ariane always looks for efficient and practical issues and solution.
FranÁois Tripet - Law Office of Francois Tripet and Associates
23 Nov 2018
Private Client review:
Ariane is a very high value professionnal that we highly recommand.
Guillaume Bzowski - KLEBER AVOCATS
23 Nov 2018

Case Studies

Professional Trustee Services in Switzerland and New Zealand

We are able to provide Professional Trustee Services in Switzerland and New Zealand to offer intelligent, independent and pro-active Trustee Services under any Trust Legislation. We are active Trustees, providing positive, transparent and informed trusteeship, able to deal with assets that are substantial and complex. We identify potential problems and deal with them before adverse issues arise. We provide a forum for the families. We understand the wishes of family members with a view to avoid disputes that could be so damaging for family wealth. We are able to manage conflictual situations and actively bring solutions in any circumstances.  Besides this, we have developed a specialization in philanthropic services through the establishment and administration of Charitable Trusts and Foundations.

Articles

60 second interview with Ariane Slinger, ACE International

Citywealth spoke to Ariane Slinger, CEO of ACE International SA to discuss special assignments, hand-holding clients and her love for vinyl records.

Read more
Switzerland’s Wealth Management Update: Law, Transparency, Digital Assets, and Philanthropy

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Awards

2020  IFC Awards
Editor's Choice
2024 Powerwomen Awards
Woman of the Year – Leadership – Financial Organisation (CEO/Board Member) - SILVER
2023 Powerwomen Awards
Woman of the Year – Business Growth (Boutique) - GOLD

Commendations

Top fifty CEOs in Private Client
International Powerwomen Top 100 2019
IFC Powerwomen Top 200 2018
IFC Powerwomen Top 200 2017
IFC Powerwomen Top 200 2018
Switzerland's Top 20 Professionals