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Bulk Deals vs Block Deals Stocks: What's the Difference?

Bulk Deals vs Block Deals Stocks

The Indian stock market is a dynamic landscape, teeming with activity from various participants.  Understanding these activities can be crucial for any investor, especially when it comes to large-volume transactions like bulk deals and block deals. While both involve significant share purchases or sales, they differ in their size, execution methods, and impact on the market. This blog aims to demystify these concepts for Indian investors.

What are Bulk Deals?

Imagine a scenario where a large investor, like a mutual fund or a wealthy individual, decides to buy or sell a substantial quantity of shares in a particular company on the Bombay Stock Exchange (BSE) or the National Stock Exchange (NSE). If this purchase or sale exceeds a specific threshold, it's classified as a bulk deal.

Threshold for Bulk Deals

In India, a transaction is considered a bulk deal if it involves at least 0.5% of the total listed shares of a company. Here's a table for better understanding:

Listed Shares of a Company

Listed Shares of a Company

100 crore shares

50 lakh shares

50 crore shares

25 lakh shares

10 crore shares

5 lakh shares

Execution of Bulk Deals

Bulk deals happen during regular trading hours on the exchange platform. There's no special window for them. The investor places an order through a broker, who then executes it by matching it with buy or sell orders from other market participants.

Impact of Bulk Deals on Share Price

Bulk deals can influence the stock price depending on the size of the transaction and whether it's a buy or sell order. A large purchase order can push the price upwards, indicating increased investor interest. Conversely, a large sell order might lead to a price dip, reflecting potential selling pressure.

Example of a Bulk Deal

Let's say Company X has 100 crore shares listed on the exchange. If a mutual fund purchases 1 crore shares of Company X in a single transaction, it would qualify as a bulk deal because it exceeds the 0.5% threshold (50 lakh shares in this case). This purchase might lead to a rise in the stock price of Company X, signalling growing investor confidence.

What are Block Deals?

Block deals involve even larger transactions compared to bulk deals. Here, institutional investors like mutual funds, foreign institutional investors (FIIs), or insurance companies trade large blocks of shares directly with each other, bypassing the exchange platform.

Threshold for Block Deals

There's no single minimum threshold for block deals in India. However, the transaction size typically involves:

  • At least 5 lakh shares of a particular company, OR
  • A total value exceeding ₹10 crore.

Execution of Block Deals

Block deals occur in a designated "block deal window" on the exchange platform. This window typically operates in two short sessions:

  • Morning Session: 8:45 AM to 9:00 AM IST
  • Afternoon Session: 2:05 PM to 2:20 PM IST

These pre-defined windows minimize the immediate impact of large block deals on the overall market price. Investors negotiate the price beforehand, and the trade happens off-exchange, meaning it doesn't directly reflect on the live market data.

Impact of Block Deals on Share Price

While block deals don't directly affect the market price during execution, they can offer valuable insights into investor sentiment. A large block purchase by a prominent institution might indicate their bullish outlook on the company, potentially influencing other investors. Conversely, a significant block sale could suggest the institution is bearish on the company's future prospects.

Example of a Block Deal

Imagine a foreign institutional investor (FII) wants to sell 20 lakh shares of Company Y. They might negotiate a block deal with a domestic mutual fund during the pre-defined block deal window. Since the transaction value exceeds 5 lakh shares and potentially ₹10 crore (depending on the share price), it qualifies as a block deal. This block sale wouldn't directly affect the live market price of Company Y, but it could signal the FII's lack of confidence, potentially impacting investor sentiment later.

Key Differences Between Bulk Deals and Block Deals


Bulk Deals 

Block Deals

Minimum Threshold

0.5% of listed shares

5 lakh shares or ₹10 crore value

Execution Method

Regular trading hours, on-exchange

Pre-defined block deal window, off-exchange

Price Discovery

Market price discovery

Pre-negotiated price


Impact on Market Price

May have a noticeable impact on the stock price depending on the size of the deal

Minimal immediate impact due to off-exchange execution


May be used by institutions or large 

Often used for institutional investors to acquire or offload large holdings without 



Suitable for investors who want to take advantage of existing market liquidity and are comfortable with potential price fluctuations.

Ideal for large investors or institutions looking to buy or sell a significant amount of shares without affecting the market price in the short term.


Visible to all market participants on trading platforms and charts

Not publicly disclosed


Subject to exchange regulations and reporting requirements

Less stringent regulations as the transaction happens outside the exchange

Impact of Bulk Deals and Block Deals

Both bulk deals and block deals can influence investor sentiment and, consequently, the stock price. However, the way they exert this influence differs:

  • Bulk Deals

    • Can cause immediate fluctuations in the stock price depending on the size and nature (buy/sell) of the transaction.

    • A large buy order can signal increased investor interest, potentially pushing the price up.
    • A large sell order might indicate selling pressure, leading to a price dip.
    • Since the price discovery happens on the exchange during regular trading hours, the impact is more transparent.
  • Block Deals

    • Don't directly affect the market price during execution as they occur off-exchange.

    • However, they can provide valuable insights into investor sentiment:
      • A large block purchase by a reputed institution can signal their bullishness, potentially attracting other investors.
      • A significant block sale might suggest the institution's bearish view, potentially impacting investor sentiment negatively.
    • The impact on the stock price might be observed later as investors interpret the information from the block deal.


Understanding the distinctions between bulk deals and block deals is crucial for Indian stock market participants. By recognizing the size thresholds, execution methods, and potential impact on the share price, investors can make informed decisions. Bulk deals offer insights into real-time market activity, while block deals provide valuable clues about institutional investor sentiment. By considering both types of transactions alongside other market signals, investors can gain a more comprehensive understanding of the market dynamics and make sound investment choices.



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