As per the BSE’s FAQ about Block deals, some data from block deals does show up in charts/marketwatch -
21. Whether block deal is used in the calculation market picture data?
A. Block deal is considered for displaying day high, day low, total traded quantity, value and number of trades. However, block deal transactions executed in scrip are not considered for updating of LTP, opening price & closing price.
This block deal likely happened via NSE as the volume being shown is very high (around 8.68 crore shares were to be sold via this block deal) -
Upon checking the chart for Kotak Mahindra Bank, 2nd June 2020 also seems to reflect the volume of the block deal that I mentioned above (that deal happened on BSE, around 5.6 crore shares were sold via it) -
