America’s richest self-made women under 40, according to Forbes

Serena Williams first athlete to make the list, with estimated fortune of $225 million

Serena Williams Is The First Athlete on Forbes' List of Richest Self-Made Women She made the cover — and the case for her personal brand — in her conversation with the magazine. Williams is worth an estimated $225 million, according to Forbes. She has won nearly $85 million in prize money from her 72 singles titles. But the majority of her wealth comes from sponsorships, business deals and investments. She's endorsed by several companies, including Nike, Pepsi, Gatorade, and even Intel. She's also a

Four of them are in their 20s. Three are singers; one is an athlete. One is already a billionaire.

Some started their own businesses, while others took over companies.

All 11 are on Forbes’ list of the richest self-made women under age 40.

Forbes defines the term "self-made" as anyone who did not inherit her fortune; the methodology is explained further here.

New to the list is Serena Williams, who is the first athlete to make Forbes’ list of richest self-made women under 40.

Williams, 37, is more than just a 23-time Grand Slam champion, however. She built her estimated $225 million fortune through her clothing line, S by Serena; her venture capital company, Serena Ventures; and stakes in the Miami Dolphins and mixed martial arts promotion company UFC.

“I want to be the brand instead of being the face,” Williams told Forbes.

Also new to the list is singer and businesswoman Rihanna, 31.

About $570 million of her estimated $600 million fortune comes from her cosmetics brand, Fenty Beauty, and her partnership with LVMH.  She is now the wealthiest female musician in the world, and she made history as the first black woman to run a major fashion house in Paris.

» Rihanna is the richest female musician in the world

Here are the 11 richest self-made women under age 40, in alphabetical order:

Karissa Bodnar

Net worth: $275 million

Age: 29

Residence: Los Angeles

Self-made score: 9

Whitney Wolfe Herd

Net worth: $290 million

Age: 29

Residence: Austin, Texas

Self-made score: 8

Kylie Jenner

Net worth: $1 billion

Age: 21

Residence: Hidden Hills, California

Self-made score: 7

Huda Kattan

Net worth: $610 million

Age: 35

Residence: Dubai

Self-made score: 9

Beyoncé Knowles

Net worth: $400 million

Age: 37

Residence: Los Angeles

Self-made score: 8

Katrina Lake

Net worth: $380 million

Age: 36

Residence: San Francisco

Self-made score: 8

Neha Narkhede

Net worth: $360 million

Age: 34

Residence: Palo Alto, California

Self-made score: 8

Rihanna

Net worth: $600 million

Age: 31

Residence: Los Angeles

Self-made score: 10

Taylor Swift

Net worth: $360 million

Age: 29

Residence: Nashville

Self-made score: 8

Kim Kardashian West

Net worth: $360 million

Age: 38

Residence: Hidden Hills, California

Self-made score: 7

Serena Williams

Net worth: $225 million

Age: 37

Residence: San Francisco Bay Area

Self-made score: 9

» Forbes' 10 richest women in the world

» Forbes: These are the world's 13 black billionaires

» Kylie Jenner is the youngest billionaire in the world