Tick size is a small technical detail that has a surprisingly large impact on how markets trade. It affects price movement, liquidity, spreads, and even trading strategies. Many investors see prices change by small increments without realizing that those increments are governed by a fixed rule.
Understanding what is tick size and how tick size in trading works helps traders and investors better interpret price action and execution quality.
Tick Size Meaning
Tick size is the smallest allowable price change for a security.
If a stock has a tick size of USD 0.01, its price can only move in increments of one cent. It cannot trade at prices between those increments.
Tick size applies to stocks, ETFs, futures, options, and other traded instruments. Each market sets its own tick size rules.
Why tick size exists?
Tick size exists to standardize pricing and ensure orderly markets.
Without a minimum price increment, markets could become chaotic, with prices jumping by infinitesimal amounts that reduce transparency and fairness.
How Tick Size Works in Trading
Tick size directly affects how prices are quoted and traded.
Price increments and order placement
Tick size determines the price levels where orders can be placed.
For example, if a stock trades at 50.00 with a tick size of 0.01, valid prices include 49.99, 50.00, and 50.01. A price like 50.005 is not allowed.
This structure limits how finely traders can compete on price.
Tick size and bid-ask spread
Tick size influences the bid-ask spread.
Smaller tick sizes generally allow tighter spreads, improving execution for traders. Larger tick sizes can widen spreads, increasing transaction costs.
Tick size and price movement
Price moves occur in multiples of the tick size.
This means the smallest possible gain or loss per share is defined by the tick size, which matters for short-term traders.
Why Tick Size Matters
Tick size shapes market behavior in subtle ways.
Liquidity and market depth
Smaller tick sizes can increase competition among market participants.
This often leads to deeper order books and better liquidity. Larger tick sizes may reduce competition at each price level.
Trading costs
Tick size affects implicit trading costs.
Wider spreads caused by larger tick sizes can increase costs for frequent traders, even if commissions are low.
Strategy design
Some trading strategies depend on small price movements.
Scalping strategies, for example, are more viable in markets with smaller tick sizes.
Tick Size in Different Markets
Tick size is not the same everywhere.
Stocks and ETFs
Most US stocks and ETFs trade with a tick size of USD 0.01.
However, some low-priced securities or special market programs may use different increments.
Futures markets
Futures contracts have predefined tick sizes set by the exchange.
For example, an index future may have a tick size worth several dollars per contract, making each price movement more meaningful.
Options markets
Options often have different tick sizes depending on price level.
Lower-priced options may trade in smaller increments than higher-priced ones.
Tick Size and Market Quality
Regulators pay close attention to tick size.
Tick size experiments
Exchanges and regulators have tested different tick sizes to study their impact on liquidity and market quality.
Changes in tick size can alter:
-
Spread behavior
-
Order book depth
-
Trading volume
Trade-offs
Smaller tick sizes improve price competition but may reduce displayed liquidity.
Larger tick sizes support liquidity providers but can raise costs for traders.
There is no perfect tick size, only trade-offs.
Tick Size vs Lot Size
These concepts are often confused.
Tick size
Tick size controls price movement.
It defines how prices change.
Lot size
Lot size controls quantity.
It defines how many shares or contracts are traded per order.
Both affect execution, but in different ways.
How Traders Use Tick Size Information
Tick size helps refine execution decisions.
Order placement decisions
Traders use tick size to decide where to place limit orders.
Understanding tick size prevents invalid orders and improves execution accuracy.
Risk and reward calculation
Tick size determines the smallest possible profit or loss.
This matters when calculating risk-reward ratios, especially for short-term trades.
Market selection
Some traders prefer markets with smaller tick sizes for tighter spreads.
Others prefer larger tick sizes where fewer price levels reduce noise.
Limitations of Tick Size Awareness
Tick size is not a trading signal.
Tick size does not predict direction
Tick size only defines price increments.
It does not indicate whether price will rise or fall.
Tick size alone is not enough
Tick size should be considered alongside:
-
Liquidity
-
Volume
-
Volatility
It supports execution decisions rather than strategy direction.
Practical Example of Tick Size
An example makes the concept clearer.
Simple example
A stock trades at 20.00 with a tick size of 0.01.
The next possible prices are 19.99 or 20.01. If the bid is 19.99 and the ask is 20.01, the minimum spread is two ticks.
A trader placing a limit order must respect these increments to avoid rejection.
Conclusion
Tick size defines the smallest price movement allowed in a market, but its impact goes far beyond technical rules. It influences spreads, liquidity, execution costs, and even which trading strategies are viable. Understanding what is tick size and how tick size in trading works helps investors and traders interpret price action more accurately and trade more efficiently.
While tick size does not determine market direction, it plays an important role in how prices move and how orders are executed.
If you trade stocks or ETFs, observing price increments and spreads inside the Gotrade app can help you see how tick size affects real-world execution and liquidity.
FAQ
What is tick size?
Tick size is the minimum price movement allowed for a security.
Does tick size affect trading costs?
Yes. It influences bid-ask spreads and execution quality.
Is tick size the same for all assets?
No. Different markets and instruments have different tick sizes.
Can traders choose tick size?
No. Tick size is set by the exchange or regulator.
Reference:
-
Investopedia, Tick Size, 2026.
-
CME Group, Tick Movements Explained, 2026.
