Block Deal Vs Bulk Deal – Difference Between Bulk And Block Deals

Quick Answer

A block deal is a large, privately negotiated trade worth at least ₹25 crore, executed through a special 15-minute exchange window at a fixed price. A bulk deal is any trade where one investor buys or sells 0.5% or more of a company’s listed shares during normal market hours, visible live on the exchange order book. The core difference is where the trade happens: a block deal stays outside the open market inside a controlled price band, while a bulk deal happens right inside the live order book at the going market price.

Table of Contents

1. What Is a Block Deal and a Bulk Deal?
2. How Do Block Deals and Bulk Deals Work? (Step by Step)
3. Practical Example With Numbers
4. Key Features of Block Deals and Bulk Deals
5. Advantages
6. Risks and Limitations
7. Tips for Beginners
8. Block Deal Vs Bulk Deal: Side-by-Side Comparison
9. Common Mistakes to Avoid
10. Who Should Track Block and Bulk Deals?
11. Conclusion
12. Frequently Asked Questions

What Is a Block Deal and a Bulk Deal?

A block deal is a single, large trade of shares agreed upon privately between a buyer and a seller, then placed through a dedicated exchange window that is separate from the normal market. A bulk deal is a large trade, or a group of trades by the same investor, that adds up to 0.5% or more of a company’s total listed shares in one trading day, matched inside the regular order book.

Both exist for the same underlying reason. A very large order dropped straight into the open market can distort the price badly. Picture a mutual fund trying to buy 10 lakh shares of a company through the normal order book. There may not be enough sellers waiting at the current price, so the fund’s own buying pushes the price higher with every order it places, making its own trade more expensive as it goes. Block and bulk deal rules give large investors a defined way to place such orders while still keeping the market informed of what happened.

For someone watching a stock on the Alice Blue trading app, a block or bulk deal disclosure is a sign that a serious institutional player, not a retail crowd, has taken a large position. Knowing why that matters is the point of this article.

One point worth clarifying early: these two categories are not always strictly separate. A trade that crosses the 0.5% bulk deal threshold can, in some cases, also be placed through the block deal window if it separately meets the block deal’s value criterion. The two frameworks solve different problems. One controls the price impact of a single giant order, and the other tracks how much of a company’s total shares changed hands with one investor in a day. So a single large trade can sometimes qualify under both.

How Do Block Deals and Bulk Deals Work?

Block deal process

1. A buyer and seller, usually institutions such as mutual funds, FIIs, or promoters, agree privately on the price and the number of shares before placing the order.
2. The trade has to clear a minimum order size. As per SEBI’s circular dated October 8, 2025, effective from December 8, 2025, this minimum is ₹25 crore in value, up from the earlier ₹10 crore requirement.nsearchives.nseindia+1
3. The order goes into one of two exchange windows: the morning window from 8:45 AM to 9:00 AM, or the afternoon window from 2:05 PM to 2:20 PM.
4. The price has to sit within a fixed band around a reference price. The morning window uses the previous trading day’s closing price. The afternoon window uses the volume weighted average price, or VWAP, of trades between 1:45 PM and 2:00 PM. VWAP simply means the average price a stock traded at during that time, weighted by how many shares changed hands at each price. SEBI widened this permitted band from ±1% to ±3% of the reference price in the same update.
5. Orders placed in the block deal window carry a time validity of 60 seconds. If a matching buy or sell order does not turn up within that time, the exchange cancels the pending order automatically.
6. A block deal order must match fully on both price and quantity. Partial matching is not allowed, and once executed, the trade must result in actual delivery of shares. It cannot be squared off or reversed on the same day.
7. Once a match happens, the exchange publishes the stock name, quantity, price, and buyer and seller category to the public after market hours on the same day.

Bulk deal process

1. An investor places an order to buy or sell a large quantity of a stock through their broker during normal trading hours, 9:15 AM to 3:30 PM.
2. The order enters the regular order book and gets matched against existing buy or sell orders at whatever price the market is offering, exactly like a retail order, just bigger.
3. After market close, the exchange totals up each client’s buy and sell quantity in every stock for the day.
4. If any single client’s total crosses 0.5% of that company’s listed shares, the exchange flags and publishes it as a bulk deal, along with the client’s name in most cases, quantity, and average price.
5. Because this trade sits inside the live order book the whole time, it can push the price up or down as it happens, unlike a block deal, which stays outside public view until it is done.

Practical Example With Numbers

Block deal example. A foreign institutional investor wants to buy shares of a company trading at ₹500 on the NSE. It agrees with a domestic mutual fund to buy 6 lakh shares at ₹495 per share, comfortably inside the ±3% band around the reference price.

Deal value equals 6,00,000 shares multiplied by ₹495, which comes to ₹29.7 crore. This clears the ₹25 crore minimum required for a block deal. The trade executes in the 8:45 to 9:00 AM window and shows up on the exchange disclosure page after market hours the same day, well before most retail traders have finished tracking the day’s price moves.

Bulk deal example. A portfolio management service buys shares of a small-cap company that has 10 crore shares outstanding. To count as a bulk deal, it needs to buy at least 0.5% of 10 crore shares, which works out to 5 lakh shares. If it buys 6 lakh shares over the day at an average price of ₹120, the total value is ₹7.2 crore, far below the block deal minimum, yet it still qualifies as a bulk deal because it clears the 0.5% share count trigger.

Table 1. Block deal example versus bulk deal example

Parameter	Block Deal Example	Bulk Deal Example
Shares traded	6,00,000	6,00,000
Price per share	₹495	₹120
Total value	₹29.7 crore	₹7.2 crore
Trigger met	Value at or above ₹25 crore	Quantity at or above 0.5% of listed shares
Where it happened	Special window, 8:45 to 9:00 AM	Regular market hours

The two examples use the same share count but land in different categories. A block deal is triggered purely by a fixed rupee value. A bulk deal is triggered by what percentage of the company’s total shares changed hands, no matter the rupee amount involved.

Key Features of Block Deals and Bulk Deals 

1. Minimum size: block deals need a value of at least ₹25 crore; bulk deals need at least 0.5% of a company’s listed shares.
2. Trading window: block deals happen only inside two 15-minute sessions; bulk deals can happen any time between 9:15 AM and 3:30 PM.
3. Price control: block deal prices stay within a fixed band around a reference price; bulk deal prices move with whatever the market is willing to pay.
4. Visibility while it happens: block deals stay off the public order book until matched; bulk deals sit inside the live order book the whole time.
5. What happens if it fails: an unmatched block deal order is cancelled automatically after 60 seconds; a bulk deal simply does not happen if no buyer or seller shows up at that price.
6. Who is usually involved: both are dominated by institutions, mutual funds, FIIs, insurance companies, and occasionally promoters, rather than retail traders.

Advantages

Both frameworks let large investors move sizeable positions without disturbing the market too much, and both hand retail investors free information about what institutions are doing.

1. Price control for large trades: a block deal’s fixed band stops one giant order from causing an unfair price spike or crash.
2. Free transparency: once disclosed, anyone can see which institutions bought or sold, at what price, and use it to gauge market mood.
3. Faster execution for institutions: rather than splitting a large order into hundreds of small trades over several days, a fund can complete a full position in one session.
4. An early read on sentiment: a large block deal purchase by a known fund house can sometimes point to confidence in a company, though it should never be the only reason to buy a stock..

Risks and Limitations

Beginners tend to misread block and bulk deal data, so it helps to know where the traps are.

1. It is not a guaranteed buy signal: a large block deal purchase does not mean the stock will rise. Institutions get calls wrong too, or the deal could just be routine portfolio rebalancing.
2. The disclosure lacks context: exchange data shows the trade, not the reason behind it. Acting on a headline like an FII buying 5 lakh shares without checking anything else is risky.
3. Liquidity gaps in bulk deals: a bulk deal in a small cap or thinly traded stock can swing the price sharply, and retail traders who chase that move can get trapped near the top.
4. Copying institutions is not a strategy: some beginners buy the moment they spot a disclosure. Institutions usually hold for much longer and can absorb far more risk, so mirroring their trade without their time horizon can backfire.
5. Reaction that comes late: the immediate price move inside a block deal window is muted because of the fixed band, but the disclosure itself can shift sentiment and price in the next session or two, by which point retail traders are often buying in late.

Tips for Beginners

1. Treat a block or bulk deal disclosure as one input, not a standalone reason to trade.
2. Check who was buying and who was selling before assuming it is good news for the stock.
3. Look at the company’s recent quarterly numbers and any news before reacting to a large institutional trade.
4. Do not chase a stock right after a bulk deal spike. Let the price settle and watch the volume pattern for a day or two first.
5. Pull disclosure data from the NSE or BSE deal pages directly, or through your Alice Blue trading platform, rather than relying on social media summaries.
6. If you are building this into a wider research habit, it also helps to understand how derivatives and options trading work, since large block trades often line up with hedging activity in futures and options. This is also useful for F&O traders who track these disclosures for early signs of where institutional hedging is building up.

Block Deal Vs Bulk Deal: Side by Side Comparison

Table 2. Block deal versus bulk deal

Parameter	Block Deal	Bulk Deal
Minimum threshold	₹25 crore in value	0.5% of the company’s total listed shares
Trading window	Two fixed sessions, 8:45 to 9:00 AM and 2:05 to 2:20 PM	Regular market hours, 9:15 AM to 3:30 PM
Price band	Fixed, within ±3% of a set reference price	No fixed band, only the usual daily circuit filter, the maximum a stock can move up or down in a day
Visible while trading	No, stays off the public order book	Yes, sits inside the live order book
Price is set by	Private negotiation between the two parties	Open market demand and supply
Unmatched order outcome	Cancelled after 60 seconds of no match	Simply does not execute if no counterparty exists
Typical participants	Institutions, FIIs, promoters	Institutions, high net worth investors, occasionally large funds
Disclosure timing	After market hours on the same day	After market hours on the same day

Common Mistakes to Avoid

1. Mixing up the two thresholds: block deals use a fixed rupee value, bulk deals use a percentage of listed shares. Confusing the two leads to wrong conclusions about how big a trade really is.
2. Ignoring who is on which side: a promoter selling shares in a bulk deal means something very different from a mutual fund buying. Always check both the direction and the party involved.
3. Judging size by the headline number alone: ₹30 crore in a large cap stock is a small fraction of its daily volume, while the same amount in a small cap could be a major event. Compare deal size to average trading volume before concluding.
4. Assuming institutions are always right: funds sell too early and buy too late just like anyone else. Their trade is information, not a guarantee.
5. Skipping the basics: buying a stock purely because of a bulk deal headline, without checking financials, debt levels, or the sector outlook, skips the part of research that actually matters.

Who Should Track Block and Bulk Deals?

Active traders, especially swing traders following momentum, get the most out of tracking these disclosures, since they can hint at near-term price movement and shifts in institutional mood. F&O traders also watch this data closely, since a large block trade can point to hedging activity building up in futures and options. Long-term investors can use the same data as a supporting check, particularly when a promoter is repeatedly selling shares in a company they hold.

Someone brand new to the market may find this data confusing at first, and that is fine. It is more useful to first get comfortable with price charts, order types, and basic company analysis on a platform like Alice Blue before adding institutional deal tracking on top.

Conclusion

Block deals and bulk deals are both ways for large investors to move sizeable quantities of shares, but the process differs. A block deal happens privately inside a fixed 15-minute window at a controlled price. A bulk deal happens in the open market and can move the live price the moment it crosses the 0.5% share threshold. Knowing this difference means you read exchange disclosures correctly instead of reacting to a headline. Use this information as one part of your research, never as the sole reason to buy or sell.

Frequently Asked Questions