Citadel and Citadel Securities founder Ken Griffin speaking to the audience on Saturday night.
Ken Griffin is CEO of Citadel.
  • Billionaire hedge-fund manager Ken Griffin said he's unsure if the stock market rally can last. 
  • "I'm a bit anxious that this rally can continue," the Citadel CEO told CNBC. 
  • Griffin also stressed the impact of the Fed's interest rate rises will soon bite the US economy. 

Billionaire hedge-fund manager Ken Griffin says he doesn't see the stock market rally of 2023 lasting for much longer as the impact of higher interest rates will soon hit hard.

Indices including the S&P 500 and Nasdaq 100 have surged about 17% and 41% respectively this year. The jump in stocks has been fueled by an AI tech boom, and hopes the Federal Reserve may soon stop raising interest rates as inflation falls.