Economic calendar · Intermediate

Rumors and Speculation Around Events

Prices move on unconfirmed stories because positioning is a race, and that same fact is why the reversals are so abrupt.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

Markets move on rumours because traders position ahead of news rather than waiting for confirmation, so acting early can pay even when the story is uncertain. The cost is that the move is built on positions that unwind if the story fails, producing sharp reversals. Treat sourcing language as a probability rather than a verdict, size unverified trades well below your normal risk, and define the exit as an event rather than a price.

What to remember

A rumour can be directionally right and still lose you money. The story called the hike correctly and got the size wrong, and the size was the entire trade.
"We do not comment on speculation" is not a denial, and "no decision has been taken at this time" contains its own escape clause.
Match size to confidence. A 0.3% position on an unverified story caps the cost of being wrong at about a third of your standard risk.
Define invalidation as an event, not a price. A 40 pip stop is meaningless when the confirmation candle will travel further than that in either direction.

Lesson 15 of 16 in Economic calendar and news

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Prices move on rumours because positioning is a race, and the people who wait for confirmation buy at a worse price than the people who did not. That is the whole mechanism, and it is the same repricing described in how forex prices move, running on an expectation instead of a fact. It also explains the other half of the pattern: a move built on an unconfirmed story is made of positions that will be unwound if the story fails, which is why the reversals are so abrupt.

180 pips up on the rumour, 210 down on the fact

Four days before a central bank meeting, a wire story citing "people familiar with the discussions" reports that the committee is weighing 50 basis points rather than the expected 25. The currency rallies 180 pips over three sessions, from 1.2560 to 1.2740, as positions build.

At the meeting the hike is 25, accompanied by guidance that rates are near their peak. Within the hour the pair trades 1.2530, a fall of 210 pips from the high and below where it stood before the story ran. Someone who bought halfway into the rally at 1.2650 is 120 pips down, which is $600 on half a lot.

Note what the rumour got right. There was a hike, and the direction was correct. It was wrong about the degree, and the degree was the entire trade. "Buy the rumour, sell the fact" is usually quoted as a piece of folklore. It is better read as a description of what happens to a price that has already moved for a reason nobody confirmed.

Sourcing language is a probability written in words

A named official on the record, a statistical release, or a regulatory filing. This is the top of the scale. It can still be revised later, but it is not in dispute today.
A major wire citing unnamed sources. Genuinely informative, because those outlets carry reputational cost for being wrong, and genuinely fallible. Treat it as a meaningful probability, not a fact.
"Reports suggest" with no named outlet. Often a rewrite of the item above, sometimes a rewrite of nothing.
An anonymous account with a screenshot. Near zero. Screenshots are trivially fabricated and the fabrication is often the point.

The useful move is to stop treating these as true or false and start treating them as different probabilities. A 60% story and a 95% story deserve different position sizes, not the same position with a different feeling attached.

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The denial that is not a denial

Institutions have a vocabulary for saying nothing. "We do not comment on speculation" is not a denial, it is a refusal to engage, and it leaves the rumour entirely intact. "No such decision has been taken at this time" contains a clause that gives the whole sentence away. A real denial names the claim and rejects it without qualification, and those are rarer than the coverage implies.

There is also the deliberate case. Officials occasionally allow a policy idea to reach a friendly outlet in order to watch the market's reaction before committing to it. When that happens the leak is accurate about the discussion and can still be wrong about the outcome, because the reaction it produced was part of the decision.

Sizing a position you cannot verify

If your standard risk is 1% of the account, a trade taken on an unverified story at 0.3% keeps the exposure while capping the cost of being wrong at roughly a third. That is not timidity, it is matching size to the confidence you actually have. The position size calculator converts the smaller percentage into lots in a few seconds, and the arithmetic of why size and confidence should track each other is set out in risk management.

Two further rules make the difference between a speculative trade and a disorderly one:

Define the invalidation as an event, not a price. "If the meeting delivers 25 with neutral guidance, I am out regardless of where price is" is a rule you can follow. A stop 40 pips away is not, because the confirmation candle will travel further than that in either direction.
Be flat, or deliberately smaller, when the fact arrives. A stop does not protect you through the release itself, so carrying a full rumour position into the confirmation is carrying it into the one moment your risk controls are least effective.

The move you missed is not a cost

The hardest part of this is not the analysis, it is watching a 180 pip rally happen without you on the basis that the story was unconfirmed, and concluding afterwards that the discipline cost you money. It did, on that occasion. What it also did was keep you out of the 210 pip reversal, and the second number is larger than the first.

The way to settle that argument is to record it. Log every rumour-driven move you decline, with the eventual outcome, for three months. You will end up with a short list of stories that were right and a longer one of stories that were not, which is a more useful basis for a sizing rule than the memory of the one you regret.

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Rumors and Speculation Around Events: questions

What does buy the rumour, sell the fact actually mean?

It describes what happens to a price that has already moved on an expectation. Traders position ahead of an anticipated announcement, pushing the price up before anything is confirmed, and when the announcement arrives those positions are closed regardless of whether the news was good. That is why a currency can fall on a rate hike it rallied for, and why the reversal is often larger than the move that preceded it.

How reliable are unnamed sources in financial reporting?

It depends heavily on the outlet. Major wire services carry reputational cost for being wrong and are often well informed, so a story citing people familiar with a discussion is meaningful information rather than invention. It is still not a fact, and the more a claim has been rewritten from one outlet to another the further it is from anyone with direct knowledge. Treat sourcing as a probability estimate, not a binary.

How should I size a trade based on a rumour?

Well below your normal risk, because the position is priced on a probability rather than a confirmed fact. If you usually risk 1% of the account, roughly a third of that keeps you exposed while limiting the damage if the story fails. Pair that with an event-based exit, so the decision to close is triggered by what the announcement says rather than by where price happens to be in the first volatile minute.

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Not investment advice. Past performance is not indicative of future results.