- Market price: the price at which ETF units are trading on PSX. It is formed by bids, offers, demand and supply.
- iNAV: an intraday indication of underlying value. PSX says it is disseminated every 15 seconds, but it should not be treated as a precise real-time NAV.
- NAV: the fund's assets minus liabilities on a per-unit basis, calculated by the fund manager and published daily after market close.
- Main lesson: a gap between the three numbers needs context before it can be interpreted.
Why one ETF can show more than one value
Open a PSX ETF page and you may see a market price and an iNAV during the trading session. Separately, the fund also has a NAV calculated by its fund manager.
These numbers are connected to the same fund, but they are not interchangeable. Each is produced differently, at a different frequency, for a different purpose.
That distinction matters because a difference between market price and iNAV does not automatically mean that one number is wrong. It also does not, by itself, establish a trading opportunity. The first task is to understand what each field measures.
The evidence first
PSX describes an ETF as a security that trades on the exchange at a market-determined price. It states that the trading price is determined by the available bid and ask quotes, and therefore by demand and supply in the market.
PSX also states that the ETF fund manager calculates NAV as assets minus liabilities on a per-unit basis and publishes it daily after the stock market closes. During trading hours, investors also receive an indicative NAV, or iNAV.
On its ETF quote pages, PSX adds an important limitation: iNAV is disseminated every 15 seconds, but the calculation can use the creation-unit composition supplied by the fund manager. That composition may not precisely match the fund's actual portfolio at every moment. PSX therefore says iNAV should not be viewed as a precise real-time update of NAV.
Verified fact: Market price, iNAV and NAV are separate ETF reference values with different calculation or price-formation processes and different update timing.
Named inference: Treating the three fields as if they were one continuously synchronized value can produce a false conclusion about an apparent premium, discount or pricing error.
The mechanism: three numbers, three jobs
1. Market price: what is trading now
Market price comes from the exchange. A buyer submits bids, a seller submits offers, and trades occur where orders meet. Because that process depends on the live order book, the traded price can be above or below an indicative underlying value.
The market price therefore answers a trading question: where are ETF units actually changing hands?
2. iNAV: the intraday indication
iNAV is designed to help investors compare the traded ETF price with an updated indication of underlying value during the session. PSX says it calculates iNAV from current market prices of the securities or other assets and cash needed for a creation unit, based on information supplied by the ETF fund manager.
The important word is indicative. iNAV is useful, but PSX explicitly warns against treating it as a precise real-time NAV. Rebalancing is one reason the creation-unit composition and the actual portfolio may not line up perfectly.
3. NAV: the official daily fund value
NAV answers an accounting question rather than an order-book question. It is the value of the fund's assets less liabilities, expressed per unit. PSX says the fund manager calculates and publishes it daily after market close.
That timing means NAV is the official daily reference, but it is not a continuously updating trading price.
A current PSX screen shows why the fields must be separated
On 18 September 2026, the PSX page for JSMFETF displayed a market price of Rs10.44 and an iNAV of Rs10.41. The market-price field was shown as of 4:45 PM, while the iNAV field carried an earlier update time of 4:31:50 PM.
The important lesson is not the three-paisa difference. It is the timestamps. A precise premium or discount calculation should use values aligned to the same point in time. When the displayed fields are asynchronous, the difference is descriptive evidence, not a clean synchronized valuation calculation.
A visible gap between market price and iNAV can reflect timing, order-book conditions, the creation-unit composition, portfolio changes or rebalancing. A gap alone does not prove that an ETF is mispriced.
How to read an ETF quote in the right order
A useful sequence is:
- Check the market price and bid/ask. This tells you where the ETF is actually trading and what immediate liquidity looks like.
- Check the iNAV and its timestamp. This gives an intraday indication, but confirm how current the field is before comparing it with a trade.
- Check the latest official NAV. This gives the fund manager's daily value per unit.
- Check for rebalancing or portfolio changes. These can weaken the assumption that iNAV is a precise proxy for the current portfolio.
- Only then interpret the gap. The comparison is useful, but the context determines what the difference means.
What would weaken this framework?
The framework would need to change if PSX or the relevant ETF documents changed the iNAV calculation, dissemination frequency, NAV publication process or creation/redemption structure. It would also be incomplete for any product whose offering document specifies materially different mechanics.
- Open risk: a displayed iNAV can be stale relative to a trade or may not perfectly reflect the current portfolio.
- Falsifier: if the relevant ETF's current governing documents specify a different pricing or NAV mechanism, those product-specific documents take precedence over this general framework.
What to watch
For any ETF comparison, watch the market-price timestamp, current bid and ask, iNAV timestamp, latest official NAV, creation-unit information and any rebalancing announcement. These checks help separate a genuine valuation difference from a timing or methodology difference.
Method
This article uses PSX primary sources only. The JSMFETF example is a descriptive snapshot from the PSX page for 18 September 2026. No premium or discount percentage is calculated because the displayed market-price and iNAV timestamps are not identical. No current ETF is labelled cheap, expensive, mispriced or suitable for investment.
Primary sources
- Pakistan Stock Exchange: Exchange Traded Funds (ETFs), checked 19 September 2026.
- Pakistan Stock Exchange: JSMFETF quote and iNAV disclosure, data displayed for 18 September 2026.
- Pakistan Stock Exchange: NITGETF quote and iNAV disclaimer, checked 19 September 2026.
- Pakistan Stock Exchange: Regulations / current rulebook index, checked 19 September 2026.