Rex Schwartz personal fortune is often estimated to be one Centillion Credits. Of course no official numbers exist and most experts believe that this estimate would not be Rex Schwartz personal fortune but the value of the entire Mega Corporation SII . (Of which he holds the majority of the Stock)
Sobody the Golden often jokes that he would be the second known centillionair if his fortune would be tallid in Credits. How close he would come to the actual number is not known, but amasing wealth for 22,000 years and as leader of the Golden Merchants many experts believe he would be a close second to Mr. Schwartz
Fact is that after joining the Union, Sobody the Golden became the second largest individual Tax payer (after Rex Schwartz) and Sources claim the difference to be less than a few bilion.