Despite seeing his fortune rise an additional $1.5 billion over the past year, Mayor Michael Bloomberg has dropped a few notches on Forbes 400 list of the wealthiest Americans.
Conservative businessman David Koch once again beat out Mayor Bloomberg to be the richest New Yorker.
Despite a net worth of $19.5 billion, Bloomberg actually fell two spots on this year's list to number 12.
Bill Gates is number one for the 18th year in a row.
The Microsoft chairman is worth $59 billion.
Facebook founder Mark Zuckerberg added $10.6 billion to his coffers this year, pushing his net worth to $17.5 billion.