Ex-date vs book closure vs record date on PSX
The three dates on every PSX dividend notice, how T+1 settlement fixes the buy-by date, and what happens to the price and payout if you buy on the ex-date.
On PSX, book closure is the window in which a company freezes its share register to work out who receives a dividend, bonus or right. The record date is the international name for the moment that snapshot is taken; on PSX it is, for practical purposes, the first day of book closure. The ex-date (ex date kya hota hai) is the first trading day on which the share changes hands without the entitlement. Because PSX settles trades on T+1, the ex-date falls on the last trading day before book closure begins, and the buy-by date, the last day you can buy and still be paid, is the trading day before that. The whole topic is those four dates on one calendar, and this post walks through them in order.
Why one dividend needs three dates
A share trade and a change of ownership are not the same event. The trade happens on the exchange at, say, 11:15 on a Tuesday. The shares move from the seller’s CDC sub-account to yours when the trade settles, which on PSX now happens on the next trading day (T+1). The company, meanwhile, does not watch the order book. It takes a snapshot of its register of members on a date it announces in advance and pays whoever is on it.
Three dates fall out of that gap:
- the date the register is read (book closure start, or record date),
- the first trading day on which a buyer will not make it onto the register in time (ex-date), and
- the last trading day on which a buyer will (buy-by date).
Get the settlement cycle wrong by a day and you have the entitlement backwards. That is why the dates are worth learning once, properly.
Book closure: the register freezes
When a PSX-listed company declares a dividend, its board notice, published on PSX’s website alongside the results, states that the share transfer books of the company will remain closed from one date to another, both days inclusive. That window is the book closure. It typically runs about a week, and the company is not obliged to make it any particular length.
During book closure the company’s share registrar does not process transfers into the register. Trading on the exchange carries on as normal; it is only the register that is frozen. Whoever is recorded as a holder when the closure begins is entitled to the dividend, the bonus shares or the right, whichever the closure was called for.
For shares held in book-entry form through CDC, which is almost all retail holdings today, “the register” means the CDC record of who holds what. If you are new to that side of the plumbing, how to open a CDC account covers what a sub-account is and why it matters here.
Record date: the same job, a different name
Markets such as the US and UK announce a single record date instead of a closure window: own the shares on the record date and you are paid. PSX notices usually state the window, and the first day of that window does the record date’s job. If you read a PSX notice that quotes a record date rather than a closure period, treat it exactly as you would the first day of book closure. Nothing about the settlement arithmetic changes.
In short: record date and book-closure start are, for an investor working out entitlement, the same date.
Ex-date and T+1: where the buy-by date comes from
Under T+1 settlement, a share bought on trading day D lands in your CDC account on trading day D+1. To be on the register when book closure begins, your shares must have settled by the trading day before closure starts.
Work backwards from a closure that begins on a Friday:
- Buy on Thursday: settles Friday, the day closure starts. Too late; the seller is paid.
- Buy on Wednesday: settles Thursday, one day before closure. In time; you are paid.
So Thursday is the ex-date (the stock trades ex-dividend, that is, without it) and Wednesday is the buy-by date. Before PSX moved from T+2 to T+1 in 2026, both dates sat one trading day earlier, which is why older guides and older habits are now a day off.
| Date | What it means | Relative to book closure (T+1) |
|---|---|---|
| Buy-by date | Last trading day a purchase still settles before the register freezes | Two trading days before closure starts |
| Ex-date | First trading day the share trades without the entitlement | One trading day before closure starts |
| Book closure start (record date) | Register read; entitlement fixed | Day one of the announced window |
| Book closure end | Register reopens; transfers resume | Last day of the announced window |
“Trading days” is doing real work in that table. If an exchange holiday or a weekend sits between the dates, everything shifts to the previous trading day. PSX confirms ex-dates in its own notices, but it is also possible to derive them from the closure start and the holiday calendar, and a calendar built that way should label the two differently.
A worked example (illustrative calendar)
The company and dates below are invented to make the arithmetic concrete; they are not a real announcement.
Example Cement Ltd, face value Rs 10, announces on Monday 5 October 2026 an interim cash dividend of 150%, which is Rs 15 per share (the percent-of-face-value convention explains that conversion). The notice sets book closure from Friday 23 October to Thursday 29 October 2026, both days inclusive. The calendar that follows:
- Announcement: Monday 5 October 2026
- Buy-by date: Wednesday 21 October 2026
- Ex-date: Thursday 22 October 2026
- Book closure begins (record date): Friday 23 October 2026
- Book closure ends: Thursday 29 October 2026
- Cash paid to the bank account on the CDC record: after closure ends, within the statutory window set by the Companies Act 2017
Reading it: an investor who buys 500 shares on Wednesday 21 October sees them settle on Thursday 22 October, one day before the register is read, and is entitled to 500 × Rs 15 = Rs 7,500 gross. An investor who buys the same 500 shares on Thursday 22 October sees them settle on Friday 23 October, the day the register freezes, and is not entitled; the seller collects the Rs 7,500 instead.
Now change one fact: suppose Thursday 22 October were an exchange holiday. The last trading day before closure would then be Wednesday 21 October, so the ex-date moves to the 21st and the buy-by date to Tuesday the 20th. The closure window itself does not move; only the trading-day arithmetic in front of it does.
What happens if you buy on the ex-date
You pay for the share and the seller keeps the dividend. That is not a penalty and it is not a trap that the exchange sets; it is what the word “ex” means. The price you pay is, in principle, already lower by roughly the dividend, so you are paying for the share without the cash that has just been separated from it.
The mirror image is true for sellers. If you sell on the ex-date, the buyer’s shares settle on the first day of closure, after the register has been read, so you are still the holder of record and the dividend comes to you. Selling on the ex-date and still being paid surprises people the first time.
Two consequences follow. First, a buy on the ex-date is not “missing the dividend” in any economic sense, because the price has moved to reflect it. Second, buying on the buy-by date purely to collect the dividend and selling on the ex-date is not a free lunch for the same reason, and the tax and zakat deducted from the cash make the round trip worse than the price drop, not better.
How the price adjusts on the ex-date
On the ex-date the cash has left the share, so the share is worth less by about that amount. For a cash dividend, that adjustment mostly comes from the market itself: the first trades of the ex-date tend to print lower than the previous close by something close to the dividend per share, though the general movement of the day can hide or exaggerate it. For bonus and right issues, which change the number of shares rather than the cash inside them, PSX adjusts the previous close mechanically so that the day’s price band and change percentage start from the right level.
Either way the drop is not a loss. On the buy-by date you held a share with Rs 15 of cash inside it; on the ex-date you hold a share with that Rs 15 removed and a claim on Rs 15 (less deductions) in a payment queue. The total is unchanged; only its form has moved. A tracker that shows the dividend as income and the price drop as a loss is telling you the same story twice.
Where to check the dates
The primary source is the company’s notice on PSX’s website, which states the closure window and, in most cases, the ex-date. The settlement cycle itself is defined in the rules of the exchange and the clearing house, published on PSX and NCCPL, and the holdings that the register reads live at CDC.
Equivest’s dividend calendar pulls those notices into one list with the buy-by date, ex-date and closure window on each row, converts the face-value percentage into rupees per share, and marks whether each ex-date is confirmed by PSX or derived from the closure start. On the portfolio tracker, a holding with an upcoming book closure carries a banner with its ex-date and buy-by date, so the “is it too late?” question is answered on the position itself rather than in a notice you have to go and find.
Learn the four dates once, check the holiday calendar, and the rest of the dividend cycle is arithmetic.
Education, not investment advice.