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How to get information about historical stock option prices for a defunct company?
Though you're looking to repeat this review with multiple securities and events at different times, I've taken liberty in assuming you are not looking to conduct backtests with hundreds of events.  I've answered below assuming it's an ad hoc review for a single event pertaining to one security. Had the event occurred more recently, your full-service broker could often get it for you for free.  Even some discount brokers will offer it so.  If the stock and its options were actively traded, you can request "time and sales," or "TNS," data for the dates you have in mind.  If not active, then request "time and quotes," or "TNQ" data. If the event happened long ago, as seems to be the case, then your choices become much more limited and possibly costly.  Below are some suggestions: Wall Street Journal and Investors' Business Daily print copies have daily stock options trading data.  They are best for trading data on actively traded options.  Since the event sounds like it was a major one for the company, it may have been actively traded that day and hence reported in the papers' listings.  Some of the print pages have been digitized; otherwise you'll need to review the archived printed copies. Bloomberg has these data and access to them will depend on whether the account you use has that particular subscription.  I've used it to get detailed equity trading data on defunct and delisted companies on specific dates and times and for and futures trading data.  If you don't have personal access to Bloomberg, as many do not, you can try to request access from a public, commercial or business school library. The stock options exchanges sell their data; some strictly to resellers and others to anyone willing to pay.  If you know which exchange(s) the options traded on, you can contact the exchange's market data services department and request TNS and / or TNQ data and a list of resellers, as the resellers may be cheaper for single queries.