The Chatham House Rule is one of the few professional conventions that has survived a century of communications change. In finance — where reputational risk, client confidentiality, and competitive sensitivity sit in nearly every conversation — it remains the most useful single sentence anyone can read at the start of a dinner.
The exact wording
That is the entire rule. It is deliberately short. There are no carve-outs, no tiered confidentiality levels, no exceptions for journalists or for academic citation. Every serious application of the rule comes from interpreting these two sentences honestly.
Where it came from
The rule was created in June 1927 at Chatham House — the informal name for the Royal Institute of International Affairs in London. The Institute hosted off-record briefings with politicians, diplomats, and economists who needed to speak candidly without producing tomorrow's headlines. The rule made that possible. It was revised in 1992 and again in 2002 to clarify that the protection extends to all participants, not just the speaker.
What the rule does — and does not — do
| Question | Allowed | Not allowed |
|---|---|---|
| Can I take notes? | Yes — for personal use and to share the substance. | Quoting a named speaker in those notes when shared. |
| Can I post about it on LinkedIn? | Yes — about the ideas, themes, and your own reflections. | Naming who said what, photos that identify guests, screenshots. |
| Can I tell a colleague the next morning? | Yes — the substance, what you learned, what changed your view. | Who was in the room, who spoke, who disagreed with whom. |
| Can I cite a number a speaker shared? | Yes — as long as it is not attributed. | Saying 'X at firm Y told me 12% last week' in a meeting. |
| Can I introduce two guests after the dinner? | Yes — that is one of the most valuable outcomes. | Introducing them by referencing what they said at the table. |
Why finance professionals rely on it
Most finance conversations carry an implicit attribution risk. A private banker speaking about how a client family thinks about succession, a fund manager describing a position, a fintech founder candid about a regulator's posture — none of these can be said openly without consequences. The Chatham House Rule is the lightest possible convention that removes that risk while still allowing the substance of the conversation to compound outside the room.
It also flattens the room. Without attribution, seniority matters less. A first-year analyst's observation is heard on its own terms. A managing director can disagree with a peer at a competing firm without it becoming a position their bank has to defend. The rule produces better conversations because it removes the cost of being interesting.
Discretion does not mean hiding. It means understanding context — which conversations belong in public and which require a private room.
How a serious table actually enforces it
Stating the rule once at the start of dinner is necessary but not sufficient. Hosts who take the format seriously do four things:
- Read the rule aloud before anyone speaks substantively — not as a formality, but to set the contract.
- Confirm the photo policy. The default at a private finance dinner is no photos of guests, and any photos used afterwards are non-identifying (the room, the menu, the table).
- Do not publish the guest list. Public guest lists turn attendance into a signal and break the rule's protective frame before the dinner has begun.
- Address the first apparent breach quickly and quietly. A short private message — not a public correction — preserves the trust of the room.
Common, accidental violations
Most breaches are not malicious. They are habits from a different format that leak into a private one.
- Posting a paraphrased line on LinkedIn the next morning that is specific enough for anyone in the industry to identify the speaker.
- Photographing the table in a way that catches a guest's face.
- Mentioning to a colleague that 'X was at dinner last night' — affiliation, not content, is itself a violation.
- Using a conversation from the dinner as the opening line in a sales email the next week.
The rule is not a non-disclosure agreement
It is worth being precise. The Chatham House Rule is a social convention, not a legal instrument. It does not protect material non-public information from securities regulators, replace an NDA between firms, or carry any enforcement mechanism beyond reputation. For information that requires legal protection — pre-deal material, regulated client data, transaction-specific numbers — the right answer is not to share it at the table at all.
Why this matters for the next generation
Younger finance professionals often arrive at their first private dinner having spent a career on Slack, LinkedIn, and conference panels — formats where attribution is the point. The Chatham House Rule asks for a different muscle: hold the substance, drop the source. That muscle is what allows trusted rooms to exist in the first place. Better rooms require it.
Frequently asked
Common questions
What is the Chatham House Rule in one sentence?
Participants may freely use what was said, but may not reveal who said it or who else was in the room.
Is the Chatham House Rule legally binding?
No. It is a social and professional convention, not a contract. Enforcement is reputational, not legal.
Can I share what was discussed at a Chatham House Rule dinner?
Yes — the substance, ideas, and conclusions are yours to share. What you cannot share is the identity or affiliation of who said it.
Does the rule apply to photos and social media?
It applies to anything that would identify a participant. Photos that show guests, screenshots, and LinkedIn posts naming attendees all break the rule.
Where was the Chatham House Rule created?
At Chatham House — the Royal Institute of International Affairs in London — in June 1927. It was revised in 1992 and 2002.
Sources & further reading