Liquidity in ETFs: Why You Must Check Volumes Before Buying

The Indian stock market has undergone a dramatic transformation over the past five years. Millions of retail investors, tired of underperforming active mutual funds, are shifting their hard-earned money into Exchange Traded Funds (ETFs). The numbers speak for themselves: passive AUM in India crossed ₹9 lakh crore recently, a testament to the growing popularity of Nifty 50, Bank Nifty, and Gold ETFs. They are simple, cost-effective, and provide instant diversification.

But underneath this convenience lies a silent, often ignored wealth-eroder: Liquidity.

Have you ever excitedly hit the “Buy” button on an ETF, only to realize the execution price was significantly higher than the underlying value? Or, worse, tried to sell a niche ETF during a market panic, but struggled to find a buyer at a fair price? If so, you’ve experienced the harsh and costly reality of poor ETF liquidity.

In this comprehensive guide tailored for Indian retail investors, we’ll explore why ETF liquidity matters, how the bid-ask spread silently eats into your returns, and the essential checks you must perform before adding any ETF to your demat account.

What Exactly is ETF Liquidity?

To understand liquidity, we must first understand how ETFs differ from mutual funds. When you invest in a traditional mutual fund, you buy and sell units directly with the Asset Management Company (AMC) at the end-of-day Net Asset Value (NAV).

ETFs, however, trade on the stock exchanges (NSE or BSE) exactly like individual shares of Reliance or TCS. Because they trade live during market hours, their liquidity depends entirely on the real-time supply and demand from buyers and sellers.

ETF liquidity in India primarily hinges on two crucial factors:

1. Trading Volumes: This is the total number of ETF units bought and sold on the exchange during a trading day. High volumes indicate a bustling, active market; low volumes mean the ETF is a ghost town.
2. The Bid-Ask Spread: This is the difference between the highest price a buyer is willing to pay (the Bid) and the lowest price a seller is willing to accept (the Ask).

Understanding the relationship between these two factors is your first line of defense as a passive investor.

The Hidden Cost: Understanding the Bid-Ask Spread

For retail investors, the bid-ask spread is essentially an invisible tax. When an ETF has low trading volume, the gap between what buyers are offering and what sellers are demanding widens significantly.

Let’s look at a practical example. Imagine you want to invest in a niche thematic ETF—perhaps a new EV or Artificial Intelligence ETF. The underlying Net Asset Value (NAV) of the ETF is exactly ₹100.

• The Bid (Highest Buyer): ₹99.00
• The Ask (Lowest Seller): ₹101.00

If you place a “market order” to buy, your broker executes the trade at the best available price: ₹101.00. You’ve just paid a full 1% premium over the actual value of the underlying assets. If you were to panic and immediately sell it, you would only receive ₹99.00. You’ve instantly lost 2% of your capital just crossing the spread, without the underlying market moving a single point!

In contrast, a highly liquid instrument like the Nippon India Nifty 50 BeES might have a bid of ₹250.00 and an ask of ₹250.05. The spread is a tiny fraction of a percent, meaning your transaction costs are negligible.

Trading Volumes vs. AUM: The Grand Illusion

One of the most dangerous mistakes Indian retail investors make is confusing Assets Under Management (AUM) with market liquidity.

A fund house might proudly advertise a massive ₹5,000 Crore AUM for their ETF. Naturally, you might assume it’s highly liquid. However, in India, a massive chunk of ETF AUM is often held by long-term institutional investors like the Employees’ Provident Fund Organisation (EPFO). These institutions buy and hold for decades; they rarely trade on the exchange. Consequently, the daily trading volume on the NSE could be shockingly low despite the massive AUM.

Always remember: AUM represents the size of the fund, but Trading Volume represents the ease of entering and exiting the fund. Before you invest, your focus must be on the Average Daily Volume (ADV) on the exchange.

The Role of Market Makers in India

If regular investors aren’t trading an ETF, who provides the liquidity? The answer lies with “Market Makers” or Authorized Participants (APs). Market makers are financial institutions appointed by the AMC to ensure there are always buy and sell quotes available on the exchange. They bridge the gap between buyers and sellers and profit from capturing the bid-ask spread.

However, the Indian market-making ecosystem is still evolving. While popular broad-market ETFs enjoy robust participation from multiple market makers (resulting in tight spreads), niche, smart-beta, or sectoral ETFs often suffer from limited market maker participation. During times of high market volatility, market makers might widen their spreads significantly to protect their own risk, leaving retail investors stranded with terrible pricing.

The “Mispricing” Trap: NAV vs. Market Price

When an ETF is illiquid, it becomes highly susceptible to “mispricing.” Because there aren’t enough trades happening to keep the market price aligned with the true value of the underlying stocks, the ETF can trade at a massive premium or a steep discount to its NAV.

We frequently see this in the Indian market during periods of extreme bullishness. Retail investors, driven by FOMO (Fear Of Missing Out), panic-buy an illiquid ETF, pushing its price 3% or 4% higher than the actual NAV. This means they are fundamentally overpaying for the underlying stocks. When the market normalizes, the ETF price crashes back down to the NAV, handing them an instant, unforced loss.

Always verify the real-time or indicative NAV (iNAV) published on AMC websites before placing a trade.

A Liquidity Checklist for Indian Retail Investors

To protect your wealth and ensure efficient trading, run through this simple checklist before buying any ETF:

1. Check the Market Depth (Order Book)

Open your brokerage app (Zerodha, Groww, Upstox) and look at the “Market Depth” or “Level 2” data. Are there thousands of units on both the buy and sell sides, or just a few scattered orders? A sparse order book is a massive red flag.

2. Analyze Average Daily Volumes (ADV)

Don’t rely on a single day’s volume. Look at the 30-day Average Daily Volume. If an ETF trades less than 10,000 units a day, you may find it incredibly difficult to exit your position quickly during a market downturn.

3. Compare Spreads Across AMCs

If you want to buy a Nifty 50 ETF, you have over a dozen options. Check the live bid-ask spreads for all of them and choose the one that consistently offers the tightest spread and highest volumes. Liquidity begets liquidity.

4. Always Use Limit Orders

This is arguably the most important rule of ETF trading in India. Never use a Market Order to buy or sell an ETF. A market order instructs your broker to execute the trade at any available price, which can be disastrous if the order book is thin. Always use a Limit Order, specifying the exact maximum price you are willing to pay.

5. Time Your Trades

In India, the first 15 minutes (9:15 AM - 9:30 AM) and the last 30 minutes of the trading session can be highly volatile. Market makers are adjusting their positions, and spreads are often widest. The safest time to trade ETFs is typically during the mid-day session (10:30 AM to 2:30 PM) when the underlying market is stable.

Conclusion

ETFs are phenomenal tools for democratizing wealth creation for the Indian retail investor. But treating an ETF exactly like a mutual fund—without respecting the mechanics of the stock exchange—can lead to frustrating and unnecessary losses.

By paying close attention to trading volumes, keeping a watchful eye on the bid-ask spread, and strictly adhering to limit orders, you can ensure that your passive investing journey remains truly low-cost and highly efficient. Don’t let the invisible tax of poor liquidity eat into your financial future.

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