Photo of Citadel founder Ken Griffin
Citadel's Ken Griffin.
  • Billionaire Ken Griffin's Citadel Securities saw a 35% plunge in revenue during the first half of 2023, according to Bloomberg.
  • Citadel pulled in a net $2.73 billion during the six months through June, down from $4.2 billion in the year-earlier period. 
  • The drop comes as falling financial-market volatility reduces opportunities to profit from outsized price fluctuations. 

Billionaire Ken Griffin's Citadel Securities logged a 35% slump in trading revenue during the first half of 2023 amid a decline in market volatility.