Ever spotted an ETF on the NSE, only to notice it trades just a few hundred units a day? It is tempting to treat low trading volume as a red flag and move on. But low on-screen volume does not automatically mean an ETF is difficult to buy or sell. Trading costs can still be higher when spreads are wide or the order book is thin, so it is important to look beyond volume when assessing ETF liquidity. This guide explains what low trading volume means, how it can affect your trades, and what to check before investing.
What Does Low Trading Volume Really Mean
Trading volume is the total number of ETF units bought and sold during a trading day. Liquidity refers to how easily you can buy or sell ETF units without materially affecting their market price. The two are linked, but not the same: an ETF can post modest daily volume and still be very easy to trade.
| Term | What it measures | What Can Influence It |
|---|---|---|
| Trading volume | Number of ETF units traded during a period | Investor trading activity |
| Liquidity | Ease of buying or selling without materially affecting the price | Underlying securities, bid-ask spreads, order-book depth, market makers and trading conditions |
What Actually Happens When Volume Is Low
When an ETF has low trading volume, there is simply less active buying and selling of its units on the exchange. That thinner activity tends to produce a few side effects you can plan around.
- Wider bid-ask spreads: Lower trading activity can be associated with wider bid-ask spreads, increasing the cost of executing a trade. However, trading volume alone does not determine the spread.
- Execution slippage: A market order may execute at prices different from the price you see when placing the order, particularly when the order book has limited depth. A limit order can help you control the maximum price you are willing to pay or the minimum price you are willing to accept.
- Premium or discount to iNAV: An ETF’s market price can trade at a premium or discount to its indicative net asset value (iNAV). Market makers and authorised participants can help support price discovery and alignment between the ETF’s market price and the value of its underlying portfolio.
- Closure or merger risk: Very small ETFs with persistently low AUM may face a higher possibility of being merged or closed, depending on the AMC’s decision and applicable regulations. However, low trading volume alone does not mean an ETF is likely to close.
A quick example makes this clear. Say an ETF has a bid price of ₹98 and an ask price of ₹100. The ₹2 difference represents the bid-ask spread, which can increase the cost of executing a trade. If you buy at ₹100 and immediately sell at ₹98, the difference between the two prices would represent the spread cost, before considering other charges.
Why Low Volume Does Not Mean Low Liquidity
Here’s the important distinction: an ETF’s liquidity cannot be judged by its on-screen trading volume alone. The liquidity of its underlying securities, bid-ask spread, order-book depth and market-making arrangements can also influence how easily it can be traded. If it holds highly liquid securities, such as large-cap stocks, this can support the ETF’s underlying liquidity even when relatively few ETF units change hands on the exchange.
This works because of the creation and redemption mechanism. Authorised participants can create or redeem ETF units with the fund in the specified creation-unit size or multiples thereof. This primary-market mechanism can help support liquidity and keep the ETF’s market price aligned with the value of its underlying portfolio. Under SEBI’s ETF market-making framework, AMCs appoint market makers to provide liquidity on the stock exchange platform through buy and sell quotes. This market-making mechanism can support secondary-market liquidity even when an ETF’s on-screen trading volume is relatively low.
Think of it as an iceberg. On-screen trading volume is only one visible part of the liquidity picture; the liquidity of the underlying securities and the ETF’s market-making mechanism can also matter. That is why retail volume figures understate the real picture.
The Factors That Really Drive ETF Liquidity
Volume is only one ingredient. Several factors shape how liquid an ETF is.
| Factor | How It Affects ETF Liquidity |
|---|---|
| Underlying securities | ETFs holding actively traded securities generally have stronger underlying liquidity. |
| Bid-ask spread | Narrower spreads can reduce the cost of executing a trade, while wider spreads can increase it. |
| Order-book depth | Greater quantities available near the current market price can make it easier to execute larger orders. |
| Market makers | Market makers can support secondary-market liquidity by providing buy and sell quotes. |
| Trading volume | Higher volume indicates greater recent trading activity, but does not by itself determine liquidity. |
| Market conditions | Volatility and changing market conditions can affect spreads, available liquidity and execution quality. |
How to Trade a Low-Volume ETF Sensibly
You do not need to avoid these funds. You just need a little discipline.
- Consider using limit orders: Set the maximum price you are willing to pay or the minimum price you are willing to accept. This can help you control execution prices when an ETF has a wider spread or limited order-book depth.
- Check the holdings and iNAV: ETFs holding highly traded underlying securities may have stronger underlying liquidity. Also compare the ETF’s market price with its iNAV, where available, before placing a large order.
- Check the spread before placing your order: Rather than relying on a fixed time window, check the current bid-ask spread and available quantities before placing an order, particularly during volatile market conditions.
- Check the AUM: A very small AUM can be worth examining alongside other factors such as trading activity, bid-ask spread and the fund’s underlying holdings. Low AUM or low trading volume alone does not determine whether an ETF is liquid or whether it will remain operational.
The Bottomline
Low ETF trading volume does not automatically mean low liquidity. It can be associated with wider bid-ask spreads, lower order-book depth and potentially higher execution costs, but trading volume is only one part of the liquidity picture. Before buying or selling a low-volume ETF, look at its underlying securities, bid-ask spread, order-book depth, AUM and market-making arrangements. Using limit orders and checking the available quotes can also help you manage execution costs.
Disclaimer: Investments in the securities market are subject to market risks. Read all the related documents carefully before investing. This content is purely for informational purposes only and should not be considered as investment advice or a recommendation. Securities quoted are for illustration purposes only and not recommendatory. Investors are requested to do their own due diligence before investing.
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