10 Nov 2025, 04:32 PM

Adjustment of F&O contracts of HDFCAMC on account of bonus.

As per the circular, effective from November 26, 2025, the HDFCAMC F&O contracts will be revised based on the bonus adjustment factor.

Calculation of the adjustment factor:

The adjustment factor for a bonus issue of A: B is defined as (A+B)/B. For HDFCAMC, the adjustment factor is (1+1)/1 = 2 since the bonus issue ratio is 1:1.

Adjustment for Options Contracts:

Strike Price: The adjusted strike price is calculated by dividing the old strike price by the adjustment factor.

Lot Size: The adjusted lot size is arrived at by multiplying the old market lot by the adjustment factor. The revised lot size would be 300.

For example:

Assume you hold a position in HDFCAMC 5400 CE. The current lot size is 150. On ex-date, the 5400 CE will be adjusted to 2700 (Strike Price 5400 / Adjustment Factor 2), and the lot size will be adjusted to 300 (Current Lot Size: 150 * Adjustment Factor 2).

Adjustment for Futures Contracts:

Futures base price: The adjusted futures base price is arrived at by dividing the settlement price of the future one day before the ex-date by the adjustment factor.

Futures lot size: The adjusted market lot will be arrived at by multiplying the old market lot by the adjustment factor. The revised market lot would be 300.

For example:

Assume you are holding a position in HDFCAMC NOV FUT and on pre-ex-date (November 25, 2025), futures close at 5500, on ex-date, the price will be adjusted to 2750 (Price on pre-ex-date: 5500 / Adjustment Factor: 2)

While the lot size will be adjusted to 300 (Current lot size: 150 * Adjustment Factor: 2).

You can learn more about this here.

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