Can someone explain the option data naming convention. I see that there's data for

AAPL2325H175

and I am guessing that this corresponds to:

AAPL 23 (year) 25 (day of the month) H (is this meant to be the month as the 8th letter in the alphabet?) 175 (strike price)

Is that a correct interpretation?

You pretty much have it right. Since about 2010, options are named from a standard convention, which works as you describe. I should add a few details:

• If the expiration day is a single digit, it gets a leading zero, e.g. AAPL2309H175 if the expiration day was the 9th.


• Strike Prices do not get a leading zero, e.g. AAPL2325H50


• Call options are A-L in order by month, put options are M-X in order by month. AAPL2325H175 is a call option; the put option for the same strike price would be AAPL2325T175. Here's the list: https://help.tradestation.com/10_00/eng/tradestationhelp/symbology/month_codes_stock_index_options.htm


• Sometimes there will be an extra number in the option symbol, like FWOA22315I50. This typically happens when the underlying symbol splits; the extra digit represents some kind of change in the deliverable or price. https://infomemo.theocc.com/infomemo/search is a good source of information about this. Each symbol has a memo and a description of what the new option symbol means exactly. You can even look up FWOA (it's memo number 53034).

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Sincerely,
Gary Stephen
DTN IQFeed Implementation Support Specialist