Bulk Deal vs Block Deal: Thresholds, Timings and What Large Trades Tell Retail Investors

A bulk deal crosses 0.5% of a company’s shares in a day. A block deal is a single trade of at least Rs 25 crore in a special window. Both are disclosed publicly after the close.

Bulk deal vs block deal is a comparison most retail investors meet in market news, where a headline says an institution bought a large stake through a block deal or that a fund was seen in the bulk deal data. The two terms sound alike, yet they follow different rules and tell you different things.

This guide explains how each deal is defined, when it can happen, what is disclosed and how to read the numbers without treating them as tips.

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What Is a Bulk Deal?

A bulk deal is not a special kind of trade. It is a label given after the fact. When one client buys or sells a quantity that is more than 0.5% of a company’s listed equity shares in a single day, the trade is reported as a bulk deal, even if it was spread across many smaller orders in the normal order book.

The test depends only on quantity. It does not depend on price or on a minimum rupee value, so a bulk deal in a small company can involve a modest amount of money, while one in a large company can be very big. Brokers must report such trades to the stock exchanges, which publish the names and quantities after the close of trading.

What Is a Block Deal?

A block deal is a single, pre-arranged trade of a large size executed through a separate window outside the regular order book. Under SEBI’s revised framework, the minimum size is Rs 25 crore per trade, up from Rs 10 crore earlier. The buyer and the seller agree on the trade in advance and enter matching orders in the window.

The idea is to let institutions move big blocks without disturbing the live price. A block deal must result in delivery, which means it cannot be squared off on the same day. This keeps the window for genuine transfers of ownership and not for quick speculation.

Bulk Deal vs Block Deal: Side-by-Side Comparison

The two tests are independent, so a single trade can satisfy both. A large block deal in a small company can also cross the 0.5% line and appear in both lists.

Who Uses Block Deals and Bulk Deals?

Most large trades come from institutional investors such as mutual funds, insurance companies and foreign portfolio investors, which is why daily reports often mention FII and DII names. Promoters and private equity funds also use the block deal window when they sell or buy a stake, because it limits the impact on the market price.

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A promoter selling through a block deal does not automatically mean bad news. It can be about raising money, meeting a regulatory need to cut holding, or planned fund exits. The reason matters more than the headline.

How to Read Bulk Deal and Block Deal Data

• Check who bought and who sold. A long-term fund buying is different from a trader who bought and sold the same stock on the same day.
• Compare the deal price with the market price. A deal done near the market price says less than one done at a clear discount.
• Look at the size relative to the company. A trade that is a large share of free float can matter more than one that is small in percentage terms.
• Note the source of the stock. A promoter or early investor selling is different from a fresh institutional buyer.
• Look for patterns over several days, not one entry.

The Nifty 50 stocks see large deals often, but they rarely move the index on their own because those companies are very liquid. Small and mid-sized companies show a bigger price impact when a large block changes hands.

Most platforms show bulk deal data in a daily table that you can filter by stock and client name. Read the bulk deal data together with the block deal window timings to see when the large orders came in, and note whether institutional investors or trading firms were on the other side. Institutional investors tend to hold for longer, while trading firms often reverse a position within hours. The reports are published after the close, so treat them as end of day information and not as a live signal.

Common Mistakes When Reading Large Deals

The first mistake is treating a deal as a tip. A buyer in a block deal has a seller on the other side, and both are usually well-informed. The second is ignoring the disclosure timing, because the data appears only after the market closes, so the price may have already moved. The third is reading a bulk deal as a promoter or institutional signal when the name is a trading firm that bought and sold the same day.

Use these records as one input. Pair them with the company’s financials, the shareholding pattern and your own plan, and never size a position because a headline mentioned a deal.

Retail investors usually see these records through a screener or a news site rather than the exchange page itself. Reading the original exchange file takes a minute longer, but it removes any chance of a transcription error in a summary.

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Conclusion

The bulk deal vs block deal difference is simple once you remember the tests. A bulk deal is defined by crossing 0.5% of a company’s shares in a day, and a block deal by a single trade of at least Rs 25 crore in a separate window that ends in delivery.

Treat both as information, not instructions. Check the names, the price, the size and the reason, and then decide with your own research.

Frequently Asked Questions

What is the difference between a bulk deal and a block deal?

Ans. A bulk deal is a trade in which total quantity bought or sold by one client in a day crosses 0.5% of the company’s listed shares, done in the normal market. A block deal is a single trade of at least Rs 25 crore done in a separate window. One is defined by quantity and the other by trade size and window.

What is the minimum size of a block deal now?

Ans. Under SEBI’s revised framework, the minimum order size for a block deal is Rs 25 crore, raised from Rs 10 crore. The exchanges run separate morning and afternoon windows for these trades, and the deal must be settled by delivery.

Are bulk deals and block deals public?

Ans. Yes. Brokers report them to the stock exchanges, and NSE and BSE publish the details after the close of the trading day. The data usually shows the client name, the quantity, the price and whether the client bought or sold.

Does a block deal mean the share price will rise or fall?

Ans. Not by itself. A block deal moves shares from one holder to another, and the price effect depends on the discount, the buyer, the seller and the mood of the market. Reading it as a buy or sell signal ignores that every deal has two sides.

Can a single trade be both a bulk deal and a block deal?

Ans. Yes, because the tests are separate. A trade can be a block deal because it is at least Rs 25 crore in the window, and also be reported as a bulk deal if it takes the day’s quantity above 0.5% of the company’s shares.

Why do promoters sell through block deals?

Ans. Promoters may sell to raise money, to reduce debt, to meet minimum public shareholding rules or to bring in a new investor. The block deal window allows a large sale at a pre-agreed price without hitting the live order book, so the sale does not disturb the market as much.

Where can I see bulk and block deal data?

Ans. The NSE and BSE websites carry daily bulk deal and block deal reports. Many research platforms also list them with filters by stock, client and date. Always check the exchange site if you want the original record.