Ex-Dividend Date
The first trading day on which a stock trades without the entitlement to an upcoming dividend, causing a reference price adjustment on NSE and BSE.
Definition
The ex-dividend date (commonly called the ex-date) is the first trading day on which a share trades without the right to receive the company's declared dividend. Any investor who purchases shares on or after the ex-dividend date will not receive the upcoming dividend payment — only those who held the shares at the close of the previous trading day (the cum-dividend day) are eligible. Under India's T+1 settlement cycle, the ex-dividend date falls one trading day before the record date, ensuring that purchases made on the cum-dividend day settle in time to appear on the register by the record date.
Why it matters
The ex-dividend date is a critical planning point for both delivery investors and F&O traders. Delivery investors who want the dividend must buy the stock at least one trading day before the ex-date so their purchase settles by the record date under T+1. For F&O participants, the ex-date introduces a predictable price adjustment: the exchange reduces the stock's reference price by the dividend amount at the open on ex-date, effectively normalising the apparent price drop. When the dividend is large enough to trigger NSE's 2% threshold, all existing option strikes and futures contract prices are also adjusted overnight so that open positions retain their economic value. Traders holding short stock options need to be particularly aware of ex-dates: holders of deep in-the-money call options may choose early exercise (where permitted under American-style contracts) to capture the dividend, raising the risk of early assignment for the option writer. On NSE, all stock options are European-style, so early exercise is not possible — but the ex-date price drop still affects the intrinsic value and premium of open positions.
How it works
The exchange announces the ex-dividend date after the company files its corporate action notice with NSE and BSE. The reference price adjustment is computed as: Adjusted Reference Price = Previous Close − Dividend per Share. This adjusted price is used as the base for circuit limit calculations on ex-date. For large dividends exceeding 2% of the stock price, NSE additionally revises all open option strikes by the same factor: New Strike = Old Strike − Dividend per Share, and adjusts futures pricing accordingly, so neither buyers nor sellers of existing contracts gain or lose value purely due to the dividend.
Example
Suppose a hypothetical company "Gamma Steel Ltd" closes at ₹500 on Monday and announces a ₹12 per share dividend with a record date of Wednesday. Under T+1 settlement, Tuesday is the ex-dividend date. An investor who buys Gamma Steel on Monday (cum-dividend day) will have the shares settled by Tuesday and will appear on the register by Wednesday, qualifying for the dividend. An investor who buys on Tuesday (ex-dividend day) will settle by Wednesday but after the record snapshot — so they do not receive the dividend. On Tuesday morning, the exchange sets Gamma Steel's reference price at ₹500 − ₹12 = ₹488. Since ₹12 is 2.4% of ₹500, NSE also adjusts all open option strikes downward by ₹12 overnight.
Plan around corporate action dates
Use TradePulse to monitor option chain data before and after ex-dividend adjustments so your strikes and premiums stay meaningful.