Jim Irsay is the son of former Colts owner Robert Irsay. He was named vice president and general manager of the Colts at 25, just as the team relocated to Indianapolis from its previous home in Baltimore.
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12. Tom Benson, New Orleans Saints — $2.8 billion
Tom Benson is a largely self-made billionaire. He garnered his fortune investing money he earned via car dealerships and banks.
He is well-known for doing the "Benson Boogie," a New Orleans second line dance, down the field of the Superdome after Saints home victories, umbrella and all.
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11. Jimmy Haslam, Cleveland Browns — $3.5 billion
Jimmy Haslam is the CEO of the Pilot Flying J truck stop and gas station chain, a position he inherited from his father, Jim Haslam. The younger Haslam purchased the Browns in 2012 for a cool $1 billion.
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10. Robert McNair, Houston Texans — $3.8 billion
Energy tycoon Robert McNair founded Cogen Technologies, an energy company that was sold to Enron in 1999 for $1.5 billion.
That same year, the NFL announced that the 32nd NFL franchise would be established in Houston, and that McNair would be the man at the helm.
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(TIE) 8. Arthur Blank, Atlanta Falcons — $4.2 billion
Arthur Blank is a co-founder of Home Depot. He purchased the Falcons for $545 million in 2002.
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(TIE) 8. Steve Bisciotti, Baltimore Ravens — $4.2 billion
Steve Bisciotti earned his billions by starting Aerotek (now Allegis Group), out of a basement office. Bisciotti and cousin Jim Davis logged more than $1 million in sales in their first year. Allegis Group is now the largest privately-held staffing company in the United States.
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7. Terrence Pegula, Buffalo Bills — $4.3 billion
Oil and real estate baron Terrence Pegula also owns the Buffalo Sabres of the NHL. His wife, Kim Pegula, is a co-owner of the Bills.
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6. Jerry Jones, Dallas Cowboys— $5.6 billion
Jerry Jones founded an oil and gas prospecting business in Arkansas in the '70s. By 1989, he was able to purchase the Dallas Cowboys for $140 million.
Jones has been an outspoken owner and never shies away from sharing his opinions on the game and the sports business.
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5. Robert Kraft, New England Patriots — $6.2 billion
Robert Kraft earned his fortune in the paper and packing industries. He purchased the Patriots for a then-record $172 million. Kraft is seen here on a visit to the White House in 2015.
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4. Shahid Khan, Jacksonville Jaguars — $7.4 billion
Shahid Khan purchased 100 percent of the Jaguars in 2011 for an estimated $760 million. His company, Flex-N-Gate, manufactures bumpers for Toyota pickup trucks.
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3. Stephen M. Ross, Miami Dolphins— $7.6 billion
Real estate developer Stephen Ross kickstarted his professional career as a tax attorney. Ross purchased a 50 percent share of the Miami Dolphins in 2008 and an additional 45 percent share the following year.
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2. Stan Kroenke, Los Angeles Rams — $8.1 billion
Stan Kroenke became independently wealthy through real estate ventures building shopping centers and apartment buildings. In 1974, he married Wal-Mart heiress Ann Walton, and in 1995, he began his career as a sports mogul.
Kroenke Sports Enterprises owns the Denver Nuggets (NBA), the Colorado Avalanche (NHL) and other sports properties, in addition to the Los Angeles Rams.
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1. Paul Allen, Seattle Seahawks — $20.9 billion
Paul Allen is the co-founder of Microsoft. He persuaded Bill Gates to drop out of Harvard to build their computer empire and coined the name "Micro-Soft."
In 1996, Allen purchased the Seattle Seahawks. He has also owned the Portland Trailblazers since 1988.