Every week, serious market participants quietly watch a data point that most retail investors completely overlook: **NSE's Bulk Deal and Block Deal disclosures**.
These aren't estimates. They aren't derived signals. They are legally mandated, name-by-name disclosures of actual institutional transactions — who bought, who sold, how much, and at what price.
This post explains what they are, how to read them, and what they actually signal.
## What Are Bulk Deals?
A **bulk deal** is defined by SEBI as any transaction where a single entity trades more than **0.5% of a company's equity** in a single trading day.
NSE discloses these **the same day, after market close**, with:
- The stock name
- The buyer or seller name
- Whether it was a BUY or SELL
- The quantity traded
- The approximate price
Example: "Morgan Stanley Asia Singapore bought 18.5 lakh shares of HDFC Bank on 2026-05-28 at ₹1,642."
That's an institutional transaction you can verify, not infer.
## What Are Block Deals?
A **block deal** is a large transaction (typically ₹10 crore or more) executed in the **dedicated block deal window** — a 15-minute window at the start of trading (currently 8:45–9:00 AM).
Block deals are used by institutions that want to transact large quantities without moving the market. The price is typically agreed bilaterally before the window opens.
Like bulk deals, NSE discloses these with buyer/seller names and quantities.
## FII vs DII — Who Are These Entities?
**FII (Foreign Institutional Investors)**: Registered foreign funds — mutual funds, pension funds, sovereign wealth funds, and hedge funds domiciled outside India. Examples: Goldman Sachs, Vanguard, Nomura.
**DII (Domestic Institutional Investors)**: Indian institutions — primarily domestic mutual funds (SBI Mutual Fund, HDFC AMC), insurance companies (LIC), and pension funds (EPFO). These typically have a longer-term mandate.
NSE's daily FII/DII data also includes **aggregate equity cash flows** — how much FII and DII collectively bought or sold across all stocks on that day. This gives a market-wide institutional sentiment signal.
## Why Bulk and Block Deals Are the Most Reliable Signal
Unlike delivery percentage (which tells you *that* ownership changed hands but not *who* is on which side), bulk and block deals tell you:
- **Exactly who** is transacting
- **Whether they are buying or selling**
- **The approximate scale** (value in ₹ crore)
This is not a derived signal. It is a legally mandated, publicly disclosed transaction record from NSE.
**This is the closest thing Indian markets have to an institutional confirmation signal.**
## What High FII Buying Means (and Doesn't)
When a large FII announces a BUY in a bulk deal, it means:
- A well-resourced institution has placed a large directional bet
- They've done significant due diligence (no institution commits ₹200 crore without analysis)
- Their mandate is typically medium-to-long term
**But it doesn't mean:**
- The stock will go up
- The timing is right for retail investors
- The FII doesn't already have a larger offsetting position elsewhere
- The trade won't be unwound in 3 weeks
**It's context — not a signal to blindly follow.**
## Combining Delivery Data with Bulk/Block Deals
The most reliable signal comes from combining:
1. **High delivery %** (above the stock's 20-day average) — participants committed to holding
2. **Confirmed FII or DII bulk BUY** in the last 30 days — named institutional purchase
3. **Rising price** — price confirming the conviction
When all three align, you have data convergence — not a guaranteed outcome, but a meaningful confluence worth paying attention to.
## How to Read NSE's Official Disclosures
NSE publishes bulk and block deal data at:
- `nseindia.com → Market Data → Bulk Deals / Block Deals`
Data is available same-day after market close, and historically for years back.
YouStockAI pulls this data nightly and shows it on the [Delivery Intelligence page](/public/dashboard) — the last 30 days of FII/DII bulk and block deals across all Nifty 500 stocks, sorted by value. Click any stock to see its full 90-day deal history.
## Market-Wide FII/DII Flow
Beyond individual stock deals, NSE also publishes aggregate FII and DII **net equity cash flows** daily:
- **FII net positive**: Foreign money entering Indian equities overall
- **FII net negative**: Foreign money leaving Indian equities overall
- **DII net positive**: Domestic institutions net buying (often counter-cyclical to FII)
When FII is selling heavily and DII is absorbing, the market often stabilises. When both are selling simultaneously, it's typically a more significant correction.
YouStockAI shows the last 5 days of this data on the Delivery Intelligence page as market-wide context.
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*Data source: NSE India official bulk/block deal disclosures and FII/DII equity cash flow reports. Educational only. Not investment advice. All investment decisions are yours.*