Own Funds, Private Property, Personal Funds
Private wealth are private funds or your own funds.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Do you know how much Koichi has in personal funds?
I gave up all of my private property and left for Kyoto in order to become a Buddhist monk.
Koichi founded a fugu poison research center with his own private funds.