Penny jumping (stepping ahead)
Penny jumping, or stepping ahead, is placing a limit order one tick better than a large resting order in order to gain priority over it, while counting on that large order as a backstop: if price moves favorably the trader profits, and if it moves against, the trader can exit against the large order for a one-tick loss. The strategy depends on the tick size and fails when the large order is pulled.
Senzoukria · Glossary · Updated September 2026
The mechanism
A large bid resting at the best price attracts traders who bid one tick higher. Their order becomes the new best bid and is filled first by incoming sellers. The large order behind acts like an option: as long as it stays, a trader who is filled and sees price weaken can sell to it one tick lower and lose only that tick, while a trader who sees price rise keeps the gain. The name comes from equity markets quoted in cents, where stepping ahead cost a penny.
Why tick size decides the cost
- On a small-tick market, stepping ahead costs little, so large displayed orders are jumped often and their priority is worth less.
- On a large-tick market such as ES, one tick is 12.50 dollars per contract, a meaningful price for the backstop, so traders more often join the queue than step ahead of it.
- Minimum tick sizes are partly a policy choice: a larger tick protects displayed liquidity from being jumped cheaply, at the cost of a wider minimum spread.
A worked example
A 400-lot bid rests at 4,990.00 as the best bid, with the offer at 4,990.25. A trader bids 10 contracts at 4,990.25, stepping ahead of the large order and closing the spread; the offer is now one tick higher. Sellers hit 4,990.25 and the trader is long 10. If buyers then lift the market, the trader sells higher. If sellers keep coming, the trader sells 10 to the 400-lot bid at 4,990.00 for a one-tick loss. The plan fails in the third case: the 400-lot bid is canceled as sellers arrive, the next bids are several ticks lower, and the backstop the trade relied on no longer exists.
Reading it in the book
- Small orders appearing one tick in front of a wall on the DOM or heatmap are often traders leaning on it.
- If the wall is pulled, those small orders become the only support and are usually filled or canceled quickly.
- A wall that keeps being jumped without trading has little effect of its own on price; its value lies in its presence as a backstop.
In Senzoukria
The heatmap shows resting size over time, so a wall and the small orders placed in front of it are visible as bands one tick apart. The Liquidity lens records walls above its 'Wall quantity threshold' and follows each level's net increases and decreases, the DOM ladder highlights levels above its 'Large orders' threshold, and the heatmap's 'Pulls tint (%)' shades size that leaves the book without trading. None of these displays identifies who placed an order or why.
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Frequently asked questions
- Is penny jumping legal?
- Placing a bona fide order at a better price is ordinary competition for priority. Problems arise elsewhere: trading ahead of a client's order using confidential information is front-running, and entering orders with the intent to cancel them before execution is spoofing. The applicable rulebooks define those boundaries.
- Why is penny jumping less common on ES than on small-tick markets?
- Because stepping one tick ahead on ES costs 12.50 dollars per contract, which is the price of the backstop if the trade fails. On markets whose tick is tiny relative to price, the same maneuver is almost free, so large displayed orders are jumped constantly.