On the Delta Exchange India options chain, I notice that multiple expiries are listed in advance (for example: 8th, 9th, 10th, 12th, 19th, 26th, 31st).
My query is regarding the transition between expiries.
For example, when the 8th September expiry settles, does the 9th September expiry (which is already listed and trading) automatically become the front expiry/current chain? If so, do the option contracts under the 9th expiry retain their existing market values (open interest, premiums, bids/asks, etc.), or are these values reset once the 8th expiry is over?
In short, I would like to clarify if:
The next expiry (already listed) simply rolls into being the current one after the earlier expiry lapses, without any reset, and
New expiries are introduced only when Delta lists them in advance (and not dynamically created after an expiry).
Follow-up:
Additionally, could you please clarify how many days in advance Delta typically lists a new options chain (for example, when October contracts are expected to appear)?