Tick Size and Its Impact on Liquidity in the Stock Market

1. Introduction Tick Size refers to the minimum price movement a stock or security can make on an exchange. In Indian markets, for example, most equity stocks on NSE and BSE have a standard tick size of ₹0.05. Though it may seem like a minor technical aspect, tick size plays a major role in market liquidity, trading costs, and price discovery. 2. What is Tick Size? Tick Size is the smallest possible change in a stock’s price. Example: If tick size is ₹0.05, a stock priced at ₹100 can move to ₹100.05, ₹100.10, etc., but not ₹100.01. Tick size is set by exchanges and can vary based on: The type of asset (equity, bond, derivative) The exchange (NSE, BSE, NYSE, etc.) The liquidity and volume of the security 3. Historical Context in India NSE started with a tick size of ₹0.25 in 1994. In 2000, NSE reduced it to ₹0.05 to improve order book liquidity. Currently, most stocks have a uniform tick size of ₹0.05, except a few low-volume or SME stocks. 4. Real World Examples a. Nifty 50 Stocks Have high liquidity and hence can function well even with ₹0.05 tick size. b. Low Volume SME Stocks May show wide gaps between buy/sell due to fewer participants. Exchanges may use higher tick sizes like ₹0.10 or ₹0.25 to stabilize pricing. 5. Practical Impact on Traders a. Scalpers & High-Frequency Traders Prefer small tick sizes to quickly enter and exit trades. Benefit from tighter bid-ask spreads. b. Retail Investors Often don’t notice tick size but are indirectly affected in execution price and slippage. c. Institutional Investors For large orders, larger tick sizes may reduce market impact by ensuring deeper quotes at each price. 6. Conclusion Tick size may seem like a small technical detail, but it has deep implications: It affects liquidity, volatility, execution price, and trading strategies. A well-calibrated tick size helps balance speed, fairness, and depth in the market.