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How can I find data on delisted stocks?
You need a source of delisted historical data. Such data is typically only available from paid sources. According to my records, AULT (Ault Inc) began as an OTC stock in the 1980s prior it having an official NASDAQ listing.  It was delisted on 27 Jan 2006.  Its final traded price was $2.94.  It was taken over at a price of $2.90 per share by SL Industries. Source: Symbol AULT-200601 within Premium Data US delisted stocks historical price data set available from http://www.premiumdata.net/products/premiumdata/ushistorical.php Disclosure: I am a co-owner of Norgate / Premium Data.