COS26 Dialogue
Join the world's largest in-person conference for chiefs of staff and CEOs. From 22-23 October, a packed programme of keynotes, workshops and structured networking with 200 chiefs of staff and CEOs from Fortune 500s, government, tech and beyond.
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The world is shifting. Chiefs of staff are at the heart of it.
Dates: 22 – 23 October, 2026
Location: Washington D.C.
Venue: Atlantic Council Headquarters
The global order is being reconfigured at speed. Trade relationships, supply chains, regulatory frameworks and political alliances are all in motion. Principals are making high-stakes decisions under real uncertainty. Chiefs of staff are the people they turn to first.This year's theme centres on how the relationship between a principal and their chief of staff is evolving in response to the growing complexity of modern leadership, a shifting geopolitical landscape, and the acceleration of that evolution through artificial intelligence.COS26 brings the global chief of staff community to the Atlantic Council's headquarters in Washington D.C. - one of the world's foremost institutions for geopolitical analysis - to work through what this moment means for you and your principal. This is not a moment for incremental thinking. Get in the room, think rigorously and leave with the clarity to act.Join us at COS26
Places are limited to 200 delegates. Bring your principal and fellow chiefs of staff and secure your spots today.
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Interested in sponsoring COS26?
Put your organisation in front of 200 senior chiefs of staff and CEOs from across the globe.
Sponsorship enquiry
A global gathering of leaders...
COS26 is built for senior chiefs of staff and the principals who rely on them, both CSA members and other guests with places limited to 200 delegates. Keynotes, panels and workshops bring together global leaders, geopolitical experts and practitioners with real experience at the highest levels of business and government. Every session is designed to produce insight you can act on.
...in partnership with the Atlantic Council
The Dialogue takes place at the Atlantic Council, a leading convening institution in Washington D.C. Founded in 1961 and trusted by heads of state, cabinet ministers, military leaders and global CEOs, it brings influential people together to address the world's most consequential challenges. There is no better setting for this conversation.
Speakers announced to date
We're building a speaker programme that matches the moment. More confirmed names coming every week.
Who Should Attend
COS26 is built for the people driving strategy at the highest levels. Places are limited to 200 delegates, so the room is intentionally senior and focused.Chiefs of Staff and CSA Members
You are managing complexity, advising principals under pressure, and navigating a world in motion. COS26 gives you the space to think rigorously alongside peers who understand the role. Connect with fellow members across technology, financial services, healthcare, government, defence, professional services, and beyond. Whether you hold the Certified Chief of Staff® or are building towards it, this is your professional community at its highest level.
Principals and CEOs
The chief of staff and principal relationship is at the heart of this year’s theme. If you rely on a chief of staff to navigate high-stakes decisions across your organisation, this is the room where that partnership gets sharper.
Organisations Investing in Leadership
Companies sending teams to COS26 leave with shared language, shared frameworks, and people better positioned to lead through uncertainty. Sponsorship opportunities are also available for organisations wanting deeper engagement with the global chief of staff community.
Two days that will change how you lead
What delegates say about the COS Dialogue
"This has been a phenomenal experience. The subject matter is relevant to chiefs of staff in what we do today, tomorrow and in the future."
"The content is top-notch. The attendees here are top-notch. This is the place to be for sure."
"What a great event. People here from all around the world sharing experience and growing their careers."
"I attended last year and was so excited to come back. Heard about all the missed opportunities after the first time. I made it a goal not to miss this year."
"The most incredible conference I have attended in a very long time."
150+ organisations, one Dialogue
The 'Davos' for chiefs of staff and their principals.
Secure your place at the world's largest chief of staff conference.
Register for COS26