Katie Ledecky

Katie Ledecky is ranked number five on the list of the richest swimmers. Her net worth is reported to be around $4 million.

Katie earned $335,000 in medal rewards alone after her incredible performance at the 2016 Olympics in Rio de Janeiro.

She was able to keep the money without jeopardizing her NCAA competition eligibility. She did, however, decline an estimated $5 million in additional sponsorship offers to continue competing for Stanford.

Katie turned pro two years later, signing a 6-year, $7 million deal with TYR. Adidas, Panasonic, Visa, Reese's, and, of course, chocolate milk is among her sponsors.

Net worth: $4 million

Citizenship: American