Each trading day, the exchanges publish lists of unusually large trades in individual stocks, along with the names of the buyers and sellers. Market media report them as bulk and block deals, often with headlines about well-known investors buying or a promoter selling.
This article explains what bulk and block deals are, how they differ, where to find them, what they can and cannot tell you, and why simply copying the names on the list is a poor strategy.
What a bulk deal is
A bulk deal is a trade, or a set of trades by the same client in the same stock on the same day, in which the total quantity bought or sold is large relative to the company's size. Under current rules, the threshold is more than 0.5 percent of the company's listed equity shares.
Bulk deals happen in the normal market during regular trading hours. They can be executed as one large order or built up through many smaller trades over the day. Brokers report them, and the exchanges publish the details after the close: the stock, the client's name, whether it was a buy or sell, the quantity and the average price.
Because the threshold is a percentage of shares outstanding, bulk deals are far more common in small and mid-sized companies, where 0.5 percent of shares is a modest sum, than in large companies.
What a block deal is
A block deal is a single large trade executed in a separate block deal window provided by the exchanges, with a high minimum order size. The buyer and seller are typically arranged in advance, often through a broker, and the trade happens at a price within a permitted band around the prevailing market price.
Block deals let large holders, such as promoters, private equity funds or institutions, transfer big stakes in one transaction without hitting the normal order book and moving the price sharply.
The minimum size, the timing of the window and the permitted price band are set by SEBI and the exchanges and have changed over time; check the current rules if you need the specifics. Block deal details are also disclosed publicly.
Bulk versus block deals
| Bulk deal | Block deal | |
|---|---|---|
| Where it happens | Normal market window | Separate block deal window |
| What defines it | Total quantity above a share-percentage threshold in a day | A single trade above a minimum size |
| Execution | One order or many trades through the day | One pre-arranged trade |
| Typical users | Funds, wealthy investors, traders building or exiting positions | Promoters, private equity, institutions moving large stakes |
| Disclosure | Published by the exchanges | Published by the exchanges |
Separately, promoters selling stakes may also use an offer for sale (OFS) through the exchange mechanism, which is different from both.
Reading the lists sensibly
Look at both sides. Every deal has a buyer and a seller. A well-known fund buying is often matched by another institution selling the same shares; the list tells you a transfer happened, not that "smart money" is unanimously bullish.
Check who the seller is. A promoter or early investor selling a large stake can reflect many things: personal financial needs, diversification, a lock-in ending, or a less optimistic view. A private equity fund exiting at the end of its investment period says little about the company's prospects.
Same-day buying and selling. Some names appear on both sides of the same stock on the same day. That is usually short-term activity, not a long-term investment decision.
Price relative to market. A block deal done at a discount to the market price can signal that the seller was keen to exit; one at a premium can reflect strong demand for the stake.
Read the filings. Large stake changes may also trigger separate disclosures under takeover and insider trading regulations, and the quarterly shareholding pattern will show the new ownership.
Watch for patterns, not single entries. The same buyer appearing in a stock repeatedly over weeks says more than one appearance. So does a promoter group selling in several tranches, or a fund that buys in one deal and quietly sells in smaller trades afterwards, which never appear on the list at all.
Why copying large investors usually fails
You see it late. Deal data is published after the trade. By the time it appears in the news, the price may already have moved, sometimes sharply, as others react to the same headline.
You don't know the full position. A buyer may have bought far more over previous weeks, or plan to sell soon. A single day's deal is one frame of a longer film.
Their reasons are not yours. A large fund may buy for index reasons, to rebalance, or as part of a hedged position, none of which the list reveals. A well-known individual investor may have a very different time horizon, risk tolerance and capacity for losses.
Small stocks are easily moved. In thinly traded companies, a reported big-name purchase can drive a short-lived rally that fades once the attention passes, leaving late buyers with losses.
Manipulation risk. In some small companies, coordinated trades have been used to create an impression of interest. Bulk deal lists alone cannot distinguish genuine investment from such activity.
Use the lists as a prompt to research the company yourself, never as a reason to buy on their own.
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Deal definitions, thresholds, windows and disclosure rules are set by SEBI and the exchanges and change from time to time; check current rules. This is educational material, not advice, and no stock is recommended. We run no tips group and no signal service, we manage nobody's money, and no return is promised.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481; Zerodha Broking Ltd. SEBI Reg: INZ000031633) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser — this content is educational, not investment advice.
Frequently Asked Questions
What is a bulk deal?
A trade or set of trades by one client in a stock on one day where the total quantity exceeds a threshold, currently more than 0.5 percent of the company's listed shares. It happens in the normal market and is disclosed daily.
What is a block deal?
A single large, usually pre-arranged trade executed in a separate block deal window with a high minimum size, used to transfer big stakes without disrupting the normal order book.
Where can I see bulk and block deals?
The NSE and BSE publish daily lists with the stock, client name, buy or sell, quantity and price, and market websites republish them.
Should I buy a stock because a famous investor bought it in a bulk deal?
Not on that basis alone. The data arrives late, you don't know their full position or reasons, and small stocks can rally briefly on such news.
Does a promoter selling in a block deal mean the company is in trouble?
Not necessarily. Promoters sell for many reasons, including personal needs and diversification. Check the context, price and any related disclosures.
Related Reading
- Daily institutional flow figures
- Rules on trading by insiders
- Why thinly traded stocks are risky
- When promoters take a company private
- Doing your own company research
- Company size and trading activity
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
