Product
Steam Move
Definition
A rapid, near-simultaneous line move across multiple sportsbooks, driven by a wave of correlated money rather than by news. Often a signal that respected accounts have acted.
Key takeaways
- A steam move is a fast, correlated line move across many sportsbooks in a short window.
- The cause is usually syndicate money, a widely followed tipping service, or books copying a sharper book.
- Trading desks respond by widening margins and cutting limits, often before forming their own view.
- Distinguishing informed money from mere volume is a core competence of a sportsbook trading operation.
Why it matters
Steam is the visible footprint of correlated action. When a line moves several points within minutes at book after book, the cause is rarely independent opinion; it is either a syndicate splitting a large position across many outlets, a widely followed service releasing a pick, or a copy-and-follow effect as risk managers see a sharp book move and adjust rather than be left offside. The distinction matters, because the first is information and the third is imitation.
Trading desks respond to steam by widening margins, reducing limits, or moving the line before they have their own reason to. That is how a genuine piece of information propagates, but it is also how a manufactured move works: a bettor who can trigger steam on one side can then take the other side at an inflated number elsewhere. Sportsbooks therefore invest heavily in distinguishing informed money from volume, and the best-regarded books move on the former and ignore the latter. For the bettor, the practical consequence is that a price seen before steam and a price seen after it are different products, and speed of execution becomes part of the edge.
Frequently asked questions
Does a steam move mean the new line is correct?
Not necessarily. Some steam reflects genuinely informed money, and some is volume from a followed service or books copying each other. The two behave very differently afterwards.
What is steam chasing?
Taking the same side after the move has already happened, usually at a worse number. It is the most common way a bettor converts someone else’s edge into a negative-expectation bet.
How do sportsbooks defend against steam?
By reducing limits, widening margins, delaying acceptance on affected markets, and scoring accounts on how predictive their bets have historically been.