A trading window closure notice tells you a listed company has barred its designated persons, and their immediate relatives, from dealing in its shares because they may hold unpublished price-sensitive information. Around results, the restriction runs from the start of the new quarter until 48 hours after the results are declared. It is a date, not a hint about the results.
These notices appear in the last week of September, every September, and again at the end of every quarter. Most readers scroll past them. They are worth ten seconds, because they are the earliest dated marker a company gives you for its next results.
What the notice is
Under SEBI’s insider trading rules, every listed company keeps a notional trading window for its designated persons: the directors, senior employees and others its own code names as likely to come across price-sensitive information before the market does. The compliance officer closes that window when those people can reasonably be expected to hold such information.
Results are the predictable case. The rules set the restriction period for financial results as running from the end of every quarter until 48 hours after the results are declared. The notice you see on the exchange is the company telling the market that this period has begun.
It is a compliance notice about who may deal, not a statement about the business.
What actually happens when the window closes
This is the part most explainers leave out, and it is the reason the notice means something.
The restriction is not left to good behaviour. The company files the blackout dates, and the exchanges and depositories freeze the permanent account numbers of the people covered, at the level of that company’s security. During the closure those people cannot deal in the shares on the market, and off-market transfers and pledges are blocked too.
That machinery started with SEBI’s framework of August 2022, which applied it to designated persons. A circular of 21 April 2025 extended it to their immediate relatives: from 1 July 2025 for the 500 largest listed companies by market capitalisation, and from 1 October 2025 for everyone else.
So when you read a closure notice for this quarter, the position is that a named list of people and their immediate relatives are locked out of the stock by the depository, not merely asked to abstain. That is what the notice is recording.
The three dates worth writing down
| What to note | Where it comes from |
|---|---|
| When the closure starts | The notice. For results, the first day after the quarter ends. |
| What it is for | The notice. Results, or some other event carrying price-sensitive information. |
| What reopens it | For results, 48 hours after they are declared. |
The start date is the detail most people get wrong, and it is worth being exact about. The quarter ends on 30 September. The restriction period begins on the day after the quarter ends, so for this cycle the closure runs from 1 October, not from 30 September. A company may choose to close its window earlier than the rule requires, and if it has, the notice is where you will see it.
Put those three together and a two-line compliance filing becomes a calendar. For the quarter ending 30 September 2026: notices filed in the last week of September, closure from 1 October, and reopening 48 hours after each company declares its results. Those results are due within 45 days of the quarter end, which is 14 November 2026. So the window reopens at some point between mid-October and mid-November, and the notice tells you the company is already working towards it.
Who is actually covered
A designated person is not a category SEBI fills in for the company. Each listed company draws up its own list under its code of conduct, and it has to include its directors and senior management, the people in finance, accounts, secretarial and legal who see the numbers before anyone else, and anybody else the company decides has that access. Promoters and their employees can be on it too.
Immediate relatives were added to the freeze in 2025 for a practical reason. A restriction that binds the finance head but not the account in a family member’s name is not much of a restriction. The list the company files now carries both.
The closure that is not about results
Almost every closure you will see is the quarterly one, and it carries no information, because it happens on a fixed schedule at every company at once.
The exception is a closure that opens outside that cycle, or one that starts earlier or runs longer than the results calendar requires. That means the compliance officer has decided that someone inside the company is holding price-sensitive information for a different reason.
Be careful with what follows. The notice will rarely say what the event is, and it is not a cue to do anything. What it is worth is attention: a company that has closed its window off-cycle is a company that is expecting to disclose something, and the disclosure, when it comes, is the thing to read. The notice is the reason you were watching.
The catch is that this filing is only useful before the closure starts, and it is two lines long in a stream of hundreds. BSE publishes the filing. StockTool.AI’s plain-English summary is live one minute later, with the original source available for verification, for whichever companies are on your watchlist, which you build by uploading your portfolio or adding stocks one by one. The rest of the modules are on the StockTool.AI features page. Get StockTool.AI on Android · on iOS
What you cannot infer from it
A closure says nothing about whether the results will be good or bad. Every listed company closes its window at the end of every quarter. A filing that every company makes on the same schedule cannot carry information about any one of them.
It also does not mean nobody may deal in the shares. The freeze covers designated persons and their immediate relatives. The wider prohibition on insider trading still applies to anyone who actually holds unpublished price-sensitive information, whether or not the company has named them.
And a closure does not end because the company has announced something. For results, it ends 48 hours after they are declared, which is usually a day or two after the headline you saw.
The useful reading is narrow and worth having: this company has entered a defined period of restricted dealing, and here is the event it is pointing at.
Where it sits in the filing trail
One notice on its own is thin. In sequence it is a timeline.
- Trading window closure notice: the quarter has ended and the company is preparing its results.
- Board meeting intimation: the date the board will meet to approve them.
- Financial results, with the outcome of the board meeting.
- Earnings call transcript, within five working days of the call.
- The window reopens, 48 hours after the results.
Each of those is a different filing type, and knowing which is which is most of the skill of reading an exchange feed quickly. We set them all out in Every Common BSE Filing Type, Explained in One Line.
All of these sit on the exchange’s announcements feed. On BSE, a trading window closure notice usually arrives under Company Update or Others rather than under a category of its own, so the filing title is what you search for.
The short version
A trading window closure notice is a date, and for once it is a date you get in advance.
Note when the closure starts, what it is for, and what will reopen it. For results that is: the day after the quarter ends, the results, and 48 hours after they are declared. Then wait for the board meeting intimation, which is the next filing in the chain.
What the notice will never tell you is what the results contain. It tells you when to start paying attention, which is a different and more useful thing than a guess.
Disclaimer
StockTool.AI is a research and information platform and is not a SEBI-registered investment adviser or research analyst. Its AI-generated insights are based on public filings, transcripts, annual reports and other publicly available information. Summaries may not be exhaustive or error-free, and the original source document governs. Nothing here is investment advice or a recommendation to buy, sell or hold any security. Any decision taken on the basis of this information is the reader’s own. Investments in securities are subject to market risks.