Is anyone here actually reading the article? Yes, they really made a gain of $15B:

> But instead of refining and transporting the gold, it opted to sell the bars and purchase new bullion in Europe. […] Due to rising gold prices, the move helped the bank to generate a capital gain of 13 billion euros ($15 billion),

This doesn't make sense. If they first sold the bars held in the US, then the gold prices rose, then they bought gold in Europe, how the hell did that amount to a capital gain of $15b? How exactly do prices rising over the course of the process lead to these $15b?
Gold is down 10+% since its recent peak. They likely sold then and repurchased later.

Then they made money thanks to gold prices fluctuating, not thanks to gold prices rising?

And how does a 10% market shift lead to gaining $15b, roughly the value of 100 tons of gold, from the sale and re-purchase of 129 tons of gold?

This math ain't mathing.

Other costs? Deviations in the actual figures from the estimates we're using here? 100 is not a million miles away from 129.
Dumpling $15B on the market should lead to a drop. Anyway, the gold price is not always going up.

The claim is that rising gold prices lead to gains of $15b. As in they started with 129 tons of gold in the US, then they sold that and bought gold in Europe, and in the end, due to rising gold prices, they had 129 tons of gold in Paris plus $15b extra cash. Please explain a hypothetical course of events which makes this plausible.

Keep in mind that 129 tons of gold is worth just a bit more than $15b, so small market fluctuations on the scale of 10% isn't enough by itself.

First thought: Maybe they bought the gold first? Or the gold price was at a temporary high when they sold it?

Second thought: The numbers don't seem to check out: 129t are 4,147,456.307 troy ounces (1 troy ounce = 31.1034768 g). The total gains of 15e9 USD would thus correspond to gains of $3,616.68 per troy ounce, which seems excessively high, given that today's gold price is at ~$4,712. Even if they sold everything at the current all-time high of $5,589.38 on January 28 (and that's a big if), they would have had to buy for not more than $1,972.70, a price we last had in fall 2023.

They must have had an exceptional crystal ball!

Did they buy before selling? Otherwise that doesn’t make sense.
Sell at high, buy at low?
The gold price is fluctuating. It doesn't always go up.

The US gold would have been on the books at the original purchase price, so something like US$35 from 1910 (when a penny had a purchasing power of 38 cents now). Having deemed it more efficient to sell that gold and buy the same amount to replace it, the new gold is on the books at the 2026 purchase price. As the 2026 money price is far higher than the 1910 price, the value on the books shows a dramatic realized capital gain.

No gain would have shown for the gold that was simply moved, even though in this case the buying and selling was simply a more efficient way of doing the equivalent of moving the gold.

Gold that was simply moved wouldn't show the same gain.

That makes more sense, thank you! Though do gold assets on the books really never get adjusted? I guess that's up the central bank to decide but I would find it surprising.