Every evening around 5:00 PM, NSE and BSE publish two files that most retail traders completely ignore. Inside those files: the names of every entity that traded 0.5% or more of a listed company's equity in a single day, and every pre-arranged large block trade that went through in those two narrow morning and afternoon windows. Sometimes it's a mutual fund rebalancing. Sometimes it's a promoter quietly exiting. Sometimes it's 12 foreign funds loading up on the same stock in the same week. If you know what you're looking at, this data is genuinely useful.
What's the Actual Difference Between the Two
A bulk deal is triggered automatically. If any single client — a mutual fund, an FII, a promoter, anyone — trades 0.5% or more of a company's total listed equity in a single trading session, the broker is required to report it to the exchange. There's no special window, no pre-arrangement. It just shows up because the size crossed the threshold.
A block deal works differently. It's a pre-negotiated trade — a buyer and seller agree on price and quantity before the session — and it must go through in one of two specific windows: 8:45 AM to 9:00 AM, or 2:05 PM to 2:20 PM. The minimum size is ₹10 crore. Because it's negotiated off the open market, it doesn't move the stock price the way a large open-market order would.
Both types of deals are disclosed on NSE (nseindia.com → Market Data → Bulk Deals / Block Deals) and BSE (bseindia.com → Markets → Equities → Bulk Deals). The data goes live within minutes of the T+0 close, typically around 5:00 PM on trade day.
Why Promoter Selling Is the Signal Everyone Ignores
This is the one that actually moves the needle for risk management. When a promoter sells in bulk — not through the block deal window, but directly in the open market — that's a different story from a PE fund offloading shares post-lockup.
NSE's own data from 2018 to 2023 shows that promoter bulk selling preceded more than 60% of significant small-cap declines. That's not a pattern you can afford to dismiss. And it makes intuitive sense: a promoter knows the business better than any analyst. If they're selling 0.5% of the float in a single session, the question worth asking is why.
A real example: in mid-2022, the promoter group of a mid-cap chemical company showed up in three consecutive weeks of bulk deal disclosures. The stock was still trading near its 52-week high. By the following quarter, results disappointed badly and the stock corrected 38% from that level. The 5 PM data was the earliest public signal available.
FII Accumulation Before a Move — The Vedanta Case
The opposite signal works too. In March 2024, Vedanta showed up in FII bulk deal disclosures 12 times across the month. Different FII names, different quantities, but the same stock and the same direction: buying.
This is what institutional accumulation looks like in the data. No single fund was crossing a threshold that forced disclosure on its own — each one was buying a meaningful enough chunk to show up individually. The pattern, when you plot it, looked like a coordinated loading. Whether it was coordinated or just convergent analysis doesn't matter much. The result was a 28% rally in the weeks that followed.
For a retail trader watching the bulk deal page, the pattern was visible in real time. By mid-March, you didn't need any other indicator to know that large foreign money was getting interested in Vedanta.
How to Actually Read the NSE Bulk Deals Page
Go to nseindia.com, look under Market Data, and click Bulk Deals. You'll see a downloadable CSV for each trading date. The columns that matter:
- Symbol: the stock
- Client Name: who bought or sold (this is the key field)
- Buy / Sell: direction of the trade
- Quantity Traded: absolute number
- Trade Price: weighted average price for the session
What you're looking for:
- Same stock appearing across multiple dates in the same direction
- Promoter or promoter group entities in the "Sell" column on multiple consecutive days
- FII names (usually foreign-sounding fund names or custodian codes) consistently on the buy side
- Mutual funds selling a stock they've publicly been bullish on — a divergence worth investigating
The block deals page follows the same structure. Because block deals are pre-arranged, they tend to be cleaner signals — the buyer and seller both knew the price going in, so there's less noise from market impact.
Three Moments Where 5 PM Data Mattered
Zee Entertainment, late 2023. Multiple bulk deal disclosures showed domestic institutions selling across consecutive sessions while the stock was still holding up technically. Traders watching only the chart saw a range-bound stock. The 5 PM data told a different story. The stock broke down sharply over the next six weeks.
IRFC, early 2024. FII names started appearing on the buy side in bulk deals as the stock was consolidating near ₹160. These weren't block deals — they were open-market trades large enough to trigger the disclosure threshold. The accumulation pattern across 10 trading days was visible to anyone checking the NSE bulk deals CSV each evening. The stock moved past ₹220 within two months.
A mid-cap IT company, Q3 2022. A promoter entity sold 0.7% of the company's equity across two sessions. The company issued no announcement, the stock barely reacted the same day, and most analysts still had a buy rating. The bulk deal file showed the sale the same evening. Earnings came in weak three weeks later and the stock fell 22% in a single session.
None of these required inside information. All of it was in public disclosures that SEBI mandates exchanges to publish.
What This Data Cannot Tell You
The bulk deal file shows you what happened, not why. A PE fund selling doesn't mean the company is bad — it might just mean their fund life is ending. An FII buying doesn't guarantee a rally — they can be wrong too, and frequently are.
What the data gives you is one more input, with a known edge in specific scenarios: promoter selling in small and mid caps is historically a risk-off signal worth heeding. FII accumulation clustering in a short window is worth investigating further before entering a position.
Cross-reference it with the shareholding pattern (which updates quarterly on exchanges), the latest earnings call transcript, and any regulatory filings. The 5 PM bulk deal data is a lead, not a verdict.
Start Here Tomorrow Morning
Bookmark the NSE bulk deals page tonight. Tomorrow morning, before you check any screener or news headline, open the previous day's bulk deals CSV. Sort by company. Look for repeats. Look for promoter names in the sell column. Look for foreign fund names clustering on one side of any stock you're already watching or holding.
Do this for two weeks. You'll develop a pattern recognition that most retail participants simply don't have — not because the data is hidden, but because almost nobody bothers to look at 5 PM.