In a block deal, one needs to transact a minimum of 500,000 shares or a minimum value of Rs.5 Crs…all executed as a single transaction under the ‘Block Deal Window’.
Now, because it gets transacted directly between two parties at a specific price point under a specific trading window, under the watcful eyes of the exchange… it does not really matter much and has no specific impact on the stock.
However what you need to watch out for is the change in ownership of shares.