According to forbes 2019 updates records:
1 Dallas Cowboys/ $5B
2 New York Yankees/ $4.6B
3 Real Madrid / $4.24B
4 Barcelona /$4.02B
5 New York Knicks / $4B
6 Manchester United /$3.81B
7 New England Patriots /$3.8B
8 Los Angeles Lakers /$3.7B
9 Golden State Warriors /$3.5B
10 NY Giants & LA Dodgers / $3.3B
Billionaire Cowboys owner Jerry Jones who made his fortune in the oil business, bought the Dallas Cowboys in 1989 for $150m. Its absolutely awesome that the precious club is rank first in the world with a whopping sum of $5 Billions. Thumbs up Jerry!