"Since 1988, Renaissance's signature Medallion fund has generated average annual returns of 66 percent."

"The remaining are "accredited investors", generally worth at least $1 million. Since its inception in March 1988, Simons' flagship $3.3 billion Medallion fund, has amassed annual returns of 35.6 percent, compared with 17.9 percent for the Standard & Poor's 500 index."

https://en.wikipedia.org/wiki/Renaissance_Technologies

Average 66 percent and average 35,6 percent is VERY far apart.