30 September 2025

Bill Gates The Trillionaire

MSFT closed today at a market cap of $3.84 trillion.

At Microsoft’s IPO (1986), Bill Gates ’ stake is commonly reported in the ~45–49% range (the peak of his post-IPO ownership; it only fell afterward).

If he had maintained that same percentage, his hypothetical net worth today would be somewhere between $1.73 to $1.88 trillion.

Even as late as 1999, Gates held more than 15% of Microsoft; if he still had that share today, it would be ~$587 billion.

Why did he end up with a lower percentage? Divorce settlement. Gifts to the Gates Foundation and other charities. Share dilution from new issuance for things like employee options. And sale of stock for diversification into other assets.

His reported net worth today is $106 billion. Had he kept his peak post-IPO stake, his net worth would put him comfortably into 13-digit territory.

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