Exactly. The three richest people in the world:

Elon Musk. Net worth ~$248 billion.
Owns ~13% of Tesla, which is worth ~$768 billion. That’s ~$99 billion in his net worth.
Owns ~48% of SpaceX, which is worth ~$150 billion. That’s ~$72 billion in his net worth.
That means at least ~$171 billion of his net worth is in companies, which is ~69% of his wealth.

Bernard Arnault. Net worth ~$207 billion.
Owns ~41% of LVMH, which is worth ~$422 billion. That’s ~$175 billion in his net worth.
That means at least ~85% of his wealth is in companies.

Jeff Bezos. Net worth ~$161 billion.
Owns ~10% of Amazon, which is worth ~$1430 billion. That’s ~$143 billion in his net worth.
That means at least ~89% of his wealth is in companies.