#1 — Bill Gates's $645 million superyacht
At the top, a yacht attributed to Bill Gates, valued at about $645 million — with a historic distinction: it would be the first hydrogen-powered superyacht in the world, which adds exclusivity (and cost) to the vessel.
Unlike the Koru's classic look, this one has a modern design and pioneered clean propulsion — a sign of where nautical luxury may be heading. It's proof that, at the absolute top, cutting-edge technology can be worth more than pure size: Gates's yacht is smaller than several record-holders, but costs more than almost all of them.
Put it all together and the lesson of the list is clear: the most expensive yachts in the world are floating kingdoms that cost hundreds of millions to buy and tens of millions a year just to maintain. And what defines "most expensive" isn't always size — it's the combination of engineering, technology, and limitless customization. In the end, these superyachts are the peak of billionaire spending: assets that lose value, devour fortunes in upkeep, and exist for one reason only — because their owners can.
