The book closure date is the date on which you must hold the stock in your demat account to be eligible for corporate action benefits such as bonus shares, splits, and dividends. During the book closure period, registrar and transfer agents (RTAs) do not handle adjustments to the shareholder's register or requests to transfer shares.
Difference between book closure date and record date
The record date and book closure date are the same in their cut-off requirement for eligibility for corporate action benefits. However, RTAs do not process requests to transfer shares during the book closure date, but this restriction does not apply to record dates.