FTX token - which gives holders discounts on FTX trading fees - was last trading at $5.33, having slumped by more than three-quarters.
Tuesday's developments left FTX investors scrambling to figure out what the deal with Binance means for their investment in FTX, according to people familiar with the matter.
In late 2019, Binance invested in FTX, then a far smaller exchange, before exiting the investment in July last year.
By then FTX had mushroomed into a growing rival to Binance, which dominates the crypto industry with over 120 million users.
"A *huge* thank you to CZ, Binance," Bankman-Fried wrote.