Last year, Duncan was number 30 on the list with a net worth of $8 billion.
The top ranking Houstonian this year is Richard Kinder at number 51 with $5.2 billion. Houston Texans owner Bob McNair comes in at number 290 with $1.4 billion and Tennessee Titans owner Bud Adams is number 356 with $1.15 billion.Other Bayou City residents include John Arnold at number 95 with $3.3 billion; Jeffrey Hildebrand is ranked number 205 with $1.9 billion; and Joe Jamail and Thomas Friedkin are tied at number 269 with $1.5 billion. George Mitchell of The Woodlands has a net worth of $2 billion which puts him at number 182 on the list.
You can see the full Forbes 400 list here.