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Tick size is the minimum price increment by which a security can move up or down in a single trade. In U.S. equity markets, most stocks trade in increments of $0.01 per share, meaning the smallest possible price change from one trade to the next is one cent. Tick size varies significantly across asset classes: futures contracts, options, and currency pairs each have their own minimum tick defined by the exchange where they trade.
Think of tick size as the smallest unit of measurement on a price ruler: it determines how finely the market can price an asset.
The U.S. Securities and Exchange Commission standardized equity tick sizes at $0.01 following the decimalization mandate that took full effect in April 2001. Before decimalization, U.S. stocks traded in fractions as small as one-sixteenth of a dollar, or $0.0625 per share. The shift to decimal pricing dramatically tightened bid-ask spreads for large-cap, highly liquid stocks, reducing transaction costs for most retail investors.
The SEC ran a Tick Size Pilot Program from 2016 to 2018 that temporarily widened the tick size for small-cap stocks to $0.05 per share to test whether wider spreads would improve market quality and analyst coverage for smaller companies. The pilot produced mixed results and was not made permanent, leaving $0.01 as the standard for U.S. equities.
Futures exchanges define tick size by contract specification, and the dollar value of a tick varies substantially across products. Knowing the tick value for any futures contract you trade is essential for position sizing and risk management.
Tick size shapes the economics of every strategy you run. In high-frequency and algorithmic trading, tick size determines the minimum spread that a market maker can capture when buying at the bid and selling at the ask. A tighter tick size reduces the profitability of pure market-making but benefits end users with tighter spreads on their transactions.
For directional traders, tick size affects slippage. In a fast-moving market, a security with a $0.01 tick can move many ticks in seconds, creating execution risk for market orders. A futures contract with a $12.50 tick value can generate hundreds of dollars of slippage on a single fill if the market is moving rapidly at time of entry.
A tick size that is too small relative to a security's trading activity fragments the order book into hundreds of price levels, making it harder to gauge true supply and demand. A tick size that is too large forces buyers and sellers into fewer discrete price points, which can reduce the precision of price discovery.
Market structure researchers and regulators continue to study the optimal tick size for different securities. The principle is that tick size should be calibrated to the actual trading economics of each security, considering average daily volume, bid-ask spread, and share price, rather than applying a uniform standard across all stocks.
Some exchanges distinguish between the minimum tick, the smallest allowable price change between two sequential trades, and the minimum price fluctuation for options or complex orders. Options on futures often have a smaller tick for certain trade types to facilitate more precise hedging at critical price levels. For example, the E-mini S&P 500 options have a minimum tick of 0.05 index points for certain order types, compared to the 0.25-point tick for the underlying futures contract.
With deep roots in traditional finance and the digital asset industry, Acquire.Fi operates as a specialist M&A advisory firm. Coverage spans M&A, secondaries, OTC, and capital markets advisory across digital assets and frontier tech. Our team has decades of combined experience across every stage of the deal lifecycle.
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