{ "id": "79e7a75d-8628-5398-960c-98589d0474f2", "slug": "limit-move", "term": "Limit Move", "aliases": [], "category": "Market Microstructure", "category_slug": "market-microstructure", "difficulty": "basic", "definition": "A limit move is the maximum allowable price change—up or down—that a futures contract or certain exchange-listed securities may move in a single trading session, as specified by exchange rules. When a market reaches its limit move, trading may be restricted or temporarily halted, allowing participants time to reassess positions and preventing disorderly price discovery during extreme volatility.", "key_takeaways": [ "Exchanges set limit moves to prevent extreme, disorderly price swings that could harm market participants and undermine market integrity.", "When a futures contract reaches its daily price limit, the market is said to be 'limit up' (if prices have risen to the upper limit) or 'limit down' (if prices have fallen to the lower limit).", "A locked-limit market occurs when trading halts entirely because no transactions can occur within the permitted price range, leaving open positions unable to be offset.", "Limit moves are more common in commodity futures (agricultural, energy, metals) than in equity index futures, which often use circuit breakers followed by renewed trading within an expanded band.", "Consecutive limit moves—a market that hits its limit for multiple days in a row—can be extremely dangerous for traders on the wrong side, as they cannot exit positions." ], "detailed_explanation": "Price limits in futures markets were introduced to address the risk of extreme volatility causing cascading failures among market participants. Without limits, a rapid adverse price move could trigger simultaneous margin calls across many market participants, generating forced liquidations that further accelerate the price move, potentially rendering the clearing system unable to handle the volume of defaults. The limit move mechanism provides a pause that allows clearing houses to assess margin adequacy and allows participants to arrange additional capital.\n\nLimit moves are calibrated differently across contracts and exchanges. The Chicago Mercantile Exchange (CME) sets limits for agricultural futures based on a percentage of a prior settlement price (e.g., ±$0.40/bushel for corn, approximately 7–10% of a typical price level). Limits are typically expanded in subsequent sessions if a contract continues to hit the limit: if corn hits its initial limit, the next session may have a wider limit of 150% of the original, then 200%, to eventually allow prices to find their true market level. The CME's equity index futures contracts (E-mini S&P 500) use a 'circuit breaker' system rather than true limit moves: trading is halted for 15 minutes at 7%, 13%, and 20% declines, and all trading ceases if the market declines 20%.\n\nThe practical trading implications of limit moves are severe. A trader who is short corn futures when the contract goes limit up has no ability to cover (buy back) their short position; the only orders that can execute are sells at or below the limit price, but buyers at the limit price may have more buying interest than there are sellers willing to transact. The position must be held until the limit is lifted or until the next trading session opens. If the market subsequently gaps open beyond the limit, the trader's loss is larger than if continuous trading had been permitted.\n\nLimit moves interact with basis risk: a trader who has hedged a physical commodity position using futures may find the hedge ineffective during a limit move if the futures price is frozen at the limit while the spot market continues to move freely. This was observed dramatically in the nickel market in March 2022, when the London Metal Exchange halted nickel trading after unprecedented limit moves (nickel doubled in price within 24 hours), highlighting the systemic stress that can arise from limit-related trading halts.\n\nHedge funds with positions in futures markets near or at limit prices face a specific set of risk management challenges. Position risk cannot be reduced through trading, and the mark-to-market loss at the limit price may not reflect the true loss that would be realized if trading resumed at a significantly different price. Risk managers must model the possibility of gap openings beyond the limit when calculating overnight risk.", "example": "A commodity trading adviser (CTA) holds a long position of 500 corn futures contracts (2.5 million bushels) on the CME. The prior day's settlement was $6.00 per bushel, and the daily limit move is ±$0.40/bushel. A severe drought report released after trading hours causes buyers to overwhelm sellers. When trading opens the next morning, the market immediately reaches $6.40 (limit up) and trading essentially halts because sellers are unwilling to sell at $6.40 when they expect the market to open even higher the following day. The CTA cannot add to the position (no sellers) and cannot take profits (only sells can occur, not purchases). Mark-to-market gain = 500 contracts × 5,000 bushels/contract × $0.40 = $1,000,000, but this gain is unrealized and the position cannot be exited. On the second day, the CME expands the limit to $0.60, and the market opens at $6.70 (above the previous day's limit) before settling at $6.50. The CTA's unrealized gain is now 500 × 5,000 × $0.50 = $1,250,000.", "formula": "Limit Up/Down Price = Prior Settlement Price ± Daily Limit", "formula_latex": null, "interactive_type": null, "calculator_id": null, "related_terms": [ "basis", "basis-risk", "circuit-breaker", "clearing", "cover", "equity", "equity-index", "exchange", "futures-contract", "futures-price", "latency-arbitrage", "lot-size", "margin", "mark-to-market", "market-order" ], "backlinks": [ "anonymous-bidding", "circuit-breaker", "dark-liquidity", "good-till-cancelled-order", "locked-limit", "nominal-price", "order-book", "price-banding", "split-close", "stop-order" ], "cross_references": [ "basis", "basis-risk", "circuit-breaker", "clearing", "cover", "equity", "equity-index", "exchange", "futures-contract", "futures-price", "margin", "mark-to-market", "physical-commodity", "price-discovery", "settlement", "volatility" ], "tags": [ "level:basic", "cat:market-microstructure" ], "asset_classes": [], "regulators": [], "see_also": [], "sources": [], "wordcount": 853, "checksum": "788bda276b0edeeb", "version": "2026.05.03", "license": "CC-BY-4.0", "updated_at": "2026-09-07T02:15:24+00:00", "_links": { "self": "https://hedgefund.wiki/api/v1/terms/limit-move", "jsonld": "https://hedgefund.wiki/api/v1/terms/limit-move?format=jsonld", "markdown": "https://hedgefund.wiki/api/v1/terms/limit-move?format=md", "graph": "https://hedgefund.wiki/api/v1/graph/limit-move", "category": "https://hedgefund.wiki/api/v1/categories/market-microstructure", "schema": "https://hedgefund.wiki/schema/term.schema.json", "html": "https://hedgefund.wiki/#/terms/limit-move" } }