What it means
Many futures exchanges set a daily price limit for each contract, measured from the previous settlement price. A limit move happens when the price reaches that boundary, which is called limit up if prices rise and limit down if they fall.
When the market is locked at the limit, there may be buyers but no sellers, or the other way round. The price may stay stuck for hours or the whole day.
Exchanges use limits to reduce panic and give participants time to arrange funds. They do not change the fair value of the contract, so the price often resumes moving the next day, sometimes by another limit move.
Some exchanges expand the limits after a limit move, so the next session allows larger changes. The rules differ by product and may be reviewed over time.
For hedgers and speculators, a limit move has major cash consequences. Gains and losses are settled daily through margin accounts, so a limit move can create a large margin call or a large credit within a single day.
A related consideration is liquidity. During a limit move the usual ability to enter or exit positions is limited, so risk planning must allow for several days of adverse movement, not just one.
In practice
Real-world examples.
Example
A metals trader is short 20 copper contracts when a mine strike pushes the market limit up. She cannot buy back contracts because there are no sellers at the permitted price. Her broker asks for additional margin the same afternoon. She had underestimated how fast a supply shock could move the price against her.
Example
A food company has hedged its future wheat purchases by buying futures. When prices make a limit move higher, the hedge gains value and offsets higher costs in the cash market. The finance team records the gain in its hedging account.
Example
A student in a finance course is given a price chart showing three limit-down days in a row. She calculates the cumulative loss for a long position and sees why daily limits do not prevent large losses over several days. Her instructor uses it to explain liquidity risk. The exercise shows that the same arithmetic applies in either direction.
Formula
Calculation
Gain or loss = Number of contracts x Contract size x Limit amount
Suppose a crude oil contract has a size of 1,000 barrels and a hypothetical daily limit of $10 per barrel. The prior settlement was $80, so a limit-up move takes the price to $90. A trader long 10 contracts gains 10 x 1,000 x 10 = $100,000 that day, while a trader short 10 contracts loses $100,000. If the market moves limit up again the next day, the cumulative move is $20 per barrel and the long trader has gained $200,000. Because the daily gain or loss is settled in cash, a limit move turns into a payment the same day. The party on the wrong side must fund the margin account promptly, which is why firms keep cash or credit lines available.Case study
Seen in the real world.
Harborview Mills is an illustrative, fictional flour producer that hedges wheat purchases with 30 futures contracts of 5,000 bushels each. After a crop failure report, wheat futures move limit up by $0.45 on two successive days.
The firm's hedge gains 30 x 5,000 x 0.45 = $67,500 on the first day and the same again on the second day, for a total of $135,000. That offsets most of the higher price it must pay for physical wheat. The numbers are invented, but they show how daily limits shape hedging results.
Harborview's finance team also noted that the cash market price rose at the same time, so its extra purchase cost roughly matched the futures gains. The hedge worked as designed, though it needed cash to meet margin calls on other, losing positions the same week.
Watch out
Common mistakes.
- Thinking a limit move means the market has stopped. Trading may continue within the limit, or the market may resume the next day. Some exchanges allow trading to continue at the limit price, so volume can still be heavy.
- Ignoring the cash impact. Margin accounts are settled daily, so a limit move can create an immediate call for cash.
- Assuming the limit applies to the whole contract life. Daily limits reset each session and may be widened.
Questions
People also ask.
What does a limit move mean?
It means the price has moved by the maximum amount permitted in one session.
What is the difference between a limit move and a limit order?
A limit move is a market event, while a limit order is an instruction to trade at a specified price.
Do all markets have limit moves?
No, many exchanges use other tools such as circuit breakers instead, and some contracts have no daily limit. Share markets often use trading halts triggered by percentage moves in the index or an individual stock.
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