Block Deal Alerts India: What an Alert Can Show

Block deal alerts in India are built on one dataset with one fixed publication time: the exchanges disseminate block deal information to the public on the same day, after market hours. That single rule sets the ceiling on what any alert product can honestly promise. Anything advertised as a real-time block deal alert is either using a different dataset or overstating what the public tape contains.

What the block deal tape actually contains

SEBI's revised block deal framework, circular SEBI/HO/MRD/POD-III/CIR/P/2025/134 dated 8 October 2025, applies from the 60th day of issuance and sets the parameters an alert reads.

The same provisions apply to the block deal window under the optional T+0 settlement cycle.

Two of these rows carry more signal than the rest. The delivery requirement means a block deal is never a round trip: someone genuinely changed position. And the 25 crore floor means the tape is self-filtering for size, which is why it is worth alerting on at all.

What a good block deal alert carries

An alert that only says "block deal in X" wastes the field that makes the dataset valuable. The exchange publishes the client name. Four things are worth carrying:

1. Counterparty name, verbatim as filed. Cleaned or normalised names are more readable but lose the ability to check the alert against the source file. Carry both if you normalise.
2. Side and quantity. Bought or sold, and how many shares. A block deal has both legs, and an alert that reports only one side reads as directional when it is not.
3. Traded price against the reference price. The window's reference price is defined by the circular, so the discount or premium is computable rather than a guess.
4. The trade date and the publication time. These differ from the date you read the alert, and conflating them is how stale rows get treated as fresh.

What a block deal alert cannot tell you

It cannot be faster than the exchange. The dissemination rule is same day after market hours. There is no compliant public source that is earlier.

It does not tell you why. A fund selling 40 crore rupees of a stock in the afternoon window may be rebalancing, meeting redemptions, or exiting a view. The tape carries the transaction, not the reason.

One deal is one data point. The more useful question is usually whether the same name is appearing repeatedly, or whether several unrelated names are accumulating the same security. That is a pattern across the tape rather than a single alert. See what is smart money convergence.

Block deals and bulk deals are different filings. They have different thresholds, windows and disclosure paths, and an alerting setup that merges them silently will double count. See bulk deals vs block deals and how to read a block deal disclosure.

Reading an alert alongside the rest of the record

A block deal is one dated event in a longer record. The alert is most useful when it points you at the surrounding filings rather than standing alone:

• The next quarterly shareholding pattern, which shows whether the position actually stuck.
• Encumbrance disclosures, because a large promoter-side sale sometimes follows a pledge event rather than a decision to sell.
• The bulk deals tracker view for the same names on the wider tape.

Flock reports bulk and block deals from the exchange files, each row stamped with its trade date and linked back to the source, with alerts on the names you follow. Coverage and plans are on the pricing page. What any deal means for your own position is your call to make. Not investment advice.