Every time you buy an ETF on the PSX, you pay a fee nobody told you about. It's not in the expense ratio. It doesn't appear on your brokerage statement. But it comes out of your return the instant your order fills - and on Pakistan's smaller ETFs, it can be seven times larger than your brokerage commission.
It's called the bid-ask spread, and it's the ETF market's best-kept secret from retail investors. Once you understand it, you'll never place a market order on a thinly-traded PSX ETF again.
This cost doesn't appear in the fund's expense ratio. It isn't reflected in the NAV. Your brokerage statement won't show it as a line item. But it's real, it's paid immediately at the moment of execution, and on Pakistan's thinner ETF market it can dwarf every other visible fee you pay.
Key takeaways
- The bid is the highest price a buyer will pay; the ask is the lowest price a seller will accept.
- You always buy at the ask (the higher price) and sell at the bid (the lower price).
- The spread is an immediate, one-way loss on every transaction - a hidden tax on trading.
- PSX ETFs vary enormously in spread width - from under 0.1% on MIIETF to over 2% on the thinnest funds.
- Long-term investors minimise this cost by trading infrequently and using limit orders.
What Is the Bid-Ask Spread?
Every tradable asset has two prices simultaneously:
- Bid price: The highest price any buyer in the market is currently willing to pay.
- Ask price (or offer price): The lowest price any seller is currently willing to accept.
The spread is the difference between these two:
Spread = Ask Price − Bid Price
When you place a buy order at market, you execute at the ask - the higher price. When you place a sell order at market, you execute at the bid - the lower price. This means you start every position slightly in the red. The moment you buy, your unit is worth the bid, which is less than what you paid (the ask).
A Concrete PSX Example
Suppose MIIETF is quoted as:
- Bid: PKR 17.00
- Ask: PKR 17.10
- Spread: PKR 0.10 (0.58%)
You buy 500 units at the ask: PKR 17.10 × 500 = PKR 8,550
The moment your order fills, those 500 units can only be immediately sold at the bid: PKR 17.00 × 500 = PKR 8,500
You're immediately PKR 50 behind - before the market has moved a single rupee. That's the spread cost.
MIIETF's NAV as of July 2026: PKR 17.04. Example prices are illustrative of a typical trading session.
Why the Spread Exists
The bid-ask spread exists because of market makers - firms that stand ready to buy and sell ETFs at all times. Market makers take on risk by maintaining inventory. They might hold 10,000 MIIETF units all day, waiting for buyers. If the NAV falls while they hold those units, they lose money.
The spread is their compensation for bearing this risk and providing you with instant liquidity. Without market makers, you might post a buy order and wait days for a seller to appear.
PSX requires ETF issuers to appoint designated market makers who must maintain continuous bid-ask quotes within specified maximum spreads. This obligation is what keeps ETF markets functional - but the maximum allowed spread is wider than what you'd see in a developed market.
How Spread Width Varies Across PSX ETFs
Not all PSX ETFs have the same spread. Width depends on:
- Trading volume - more active funds attract more market participants, compressing the spread
- AUM size - larger funds have more market maker inventory and tighter pricing
- Underlying stock liquidity - ETFs tracking liquid large-caps have tighter spreads than those tracking narrow sectors
- AP activity - active Authorized Participants create competitive pressure on spreads
Approximate spread ranges across PSX ETFs (data as of July 2026):
| ETF | AUM (PKR) | Typical Spread | Spread Type |
|---|---|---|---|
| MIIETF | ~PKR 2.0 Bn | 0.1–0.5% | Consistently tight |
| MZNPETF | ~PKR 1.5 Bn | 0.1–0.5% | Consistently tight |
| JSMFETF | ~PKR 1.4 Bn | 0.1–0.5% | Tight (high volume) |
| UBLPETF | ~PKR 540 Mn | 0.3–1.0% | Moderate |
| HBLTETF | ~PKR 520 Mn | 0.3–1.5% | Moderate-variable |
| JSGBETF | ~PKR 390 Mn | 0.5–2.0% | Can widen |
| NBPGETF | ~PKR 260 Mn | 0.5–3.0%+ | Can widen significantly |
| NITGETF | ~PKR 215 Mn | 0.3–1.5% | Moderate-wide |
| ACIETF | ~PKR 86 Mn | 1.0–8%+ | Frequently extreme |
Illustrative ranges based on AUM and observed premium/discount data. ACIETF recorded a -8.48% discount to NAV in July 2026. Actual spreads fluctuate by session, volatility, and time of day. Always check iNAV before trading.
The Round-Trip Cost: Buy + Sell
The spread is paid twice during the life of an investment - once on entry (you buy at the ask), once on exit (you sell at the bid).
Round-trip spread cost = Entry spread + Exit spread
On MIIETF with a 0.5% round-trip, a PKR 100,000 investment costs you PKR 500 in spread - every time you complete a buy/sell cycle. On a small fund with a 4% round-trip spread, the same investment loses PKR 4,000 before any market movement.
This is why frequent trading destroys ETF returns even faster than management fees. A trader who buys and sells ACIETF four times a year might pay 12–16% in annual spread costs alone. Passive investors who buy-and-hold rarely notice the spread.
Spread vs Brokerage Commission: Which Is Bigger?
Most investors focus on brokerage commission (typically 0.15–0.25% per trade on the PSX) because it appears as a line item on their statement. But on thin PSX ETFs, the spread is far larger.
| Cost | Typical Range | Visible? |
|---|---|---|
| Brokerage commission | 0.15–0.25% per trade | Yes - listed on statement |
| Bid-ask spread (one way) | 0.1–2%+ depending on ETF | No - hidden in execution price |
| PSX settlement levy | ~0.017% | Yes |
For a trade in ACIETF with a 1.5% spread and 0.20% brokerage commission, the spread is 7.5× larger than the commission - but you'd never know from your statement.
How to Minimise Bid-Ask Spread Costs
1. Use Limit Orders, Not Market Orders
A market order executes immediately at whatever price is available - which means you always cross the full spread. A limit order lets you specify the price you're willing to pay, so you can buy closer to the midpoint of the spread or even at the bid.
For PSX ETFs, the standard guidance: always use limit orders. The market is not so fast-moving that you need instant execution. Set your limit order within the spread and let it fill.
How to see the actual bid/ask on your broker app: Look for the "Order Book" or "Market Depth" view on the ETF's ticker page - this shows the live bid and ask with the queue behind each. If your broker app doesn't display this, visit psx.com.pk directly and search the ETF ticker. Never execute without checking the order book first. Most broker apps only show the last traded price, which is a historical data point - not the price you'll actually trade at.
2. Avoid Trading at Market Open and Close
Spreads are typically widest in the first and last 15 minutes of the trading day. Market makers are more cautious - volatility is highest and inventory positions are being reset. The middle of the trading session (10:30–14:00 PST) tends to offer tighter spreads.
3. Check the iNAV Before Ordering
The PSX publishes an Indicative NAV (iNAV) every 15 seconds during trading hours. If the ask price is significantly above iNAV, you're about to pay a premium on top of the spread. Both costs combine against you. Never buy without checking iNAV first.
4. Favour Liquid ETFs for Active Strategies
If you intend to make frequent additions or withdrawals, prioritise funds with consistently tight spreads - primarily MIIETF and MZNPETF. Save the smaller-AUM funds for positions you intend to hold for years without touching.
Frequently Asked Questions
Is the bid-ask spread included in the ETF's TER?
No. The TER captures only management fees, registration costs, and operational expenses at the fund level. The bid-ask spread is a secondary market transaction cost that happens between you and other investors - the fund manager never touches it. This is why two ETFs with identical TERs can have very different total trading costs depending on their liquidity.
Why did my ETF spread suddenly widen?
Spreads widen during high-volatility sessions, at market open and close, and on days when market makers are cautious about holding inventory. On thin PSX ETFs, an unusual market event or a low-volume day can cause spreads to jump from 0.5% to 2%+ temporarily. This is a known risk of trading smaller, less-liquid funds - and the strongest argument for always using limit orders rather than market orders.
Why does my broker app only show one ETF price?
Most broker apps show either the last traded price or the mid-price for display purposes - neither tells you what you'll actually pay. To see the real bid and ask, switch to the "Order Book" or "Market Depth" view in your trading platform, or check psx.com.pk directly. The displayed price and your execution price can be meaningfully different on thin PSX ETFs.
Is a 0.5% ETF bid-ask spread worth worrying about?
On a single trade in isolation, it feels small. But if you're investing PKR 500,000, a 0.5% one-way spread costs PKR 2,500 before the market has moved. Over a decade of quarterly additions and an eventual exit, spread costs can compound to tens of thousands of rupees - all invisible in your portfolio statement. On smaller funds where spreads reach 2%+, the numbers become genuinely significant.
The Bottom Line
The bid-ask spread is one of the ETF market's best-kept secrets from retail investors. It's a real cost, paid immediately on every transaction, and on Pakistan's thinner ETF market it can be the largest single trading cost you pay - larger than brokerage commission, often invisible without looking at the order book.
The solutions are straightforward: use limit orders, trade infrequently, favour liquid funds when activity is required, and always check iNAV before executing. ETFs are still the most cost-efficient equity investment structure available to Pakistani investors - but only if you trade them intelligently.
Related Reading: NAV vs Market Price in PSX ETFs Explained | How Authorised Participants Keep ETF Prices Honest | 7 Structural Reasons PSX ETFs Underperform Their Index | Pakistan ETF Expense Ratio Guide
Educational content only. Spread data is illustrative. Verify current quotes through your PSX broker platform.
This article is for educational and informational purposes only. It does not constitute investment advice. Always conduct your own due diligence and consult a qualified financial advisor before making any investment decisions. All data sourced from PSX, MUFAP, and fund factsheets. Past performance is not indicative of future results.
Dr. Faisal Shahzad
Chief Investment Strategist
Dr. Faisal Shahzad holds an MBA from Innsbruck, Austria, and has spent over a decade navigating complex financial markets. He specializes in Exchange Traded Funds (ETFs) and brings extensive, practical knowledge of both international markets and the Pakistan Stock Exchange (PSX).
Expertise: 15+ Years of experience in ETFs, both internationally and on the PSX.