Wheaton Precious Metals Just Added $4 Billion in Market Value. Now the Antamina Math Really Matters

Record cash flow and rising silver exposure sent WPM sharply higher after earnings. The deeper question is whether a $4.3 billion silver stream and premium valuation justify the excitement.

Wheaton Precious Metals shares jumped roughly 8% Friday morning following its second-quarter results and earnings call. At around $135 per share, that move added roughly $4 billion to $4.5 billion of equity value in a matter of hours.

That number caught my attention because it is almost exactly what Wheaton paid for its new silver stream on Antamina: $4.3 billion.

The market is effectively telling investors that Thursday’s earnings report did more than confirm a strong quarter. It increased confidence that Wheaton can absorb the largest streaming transaction in its history, continue producing extraordinary margins and still grow into one of the most important precious-metals royalty and streaming businesses in the world.

The headline numbers certainly support that optimism. Q2 revenue reached a record $929 million, net earnings were $543 million, operating cash flow hit $650 million, and cash operating margin reached an extraordinary $3,875 per gold-equivalent ounce. For the first six months of 2026, Wheaton generated $1.8 billion of revenue and $1.4 billion of operating cash flow.

But there is a more interesting story underneath the records.

Silver generated 52% of quarterly revenue, overtaking gold. Net debt now sits near $1.9 billion after the Antamina acquisition. Management says the existing portfolio can grow production roughly 50% to 1.2 million GEOs by 2030 without another acquisition. And despite the stock’s enormous run, Wheaton’s valuation relative to its own history is not nearly as extreme as the share price alone suggests.

The Antamina economics, however, require more thought than simply calling the transaction “accretive.”

At today’s silver price, my simplified math suggests the new stream could generate roughly $300 million of annual cash margin during its initial high-production years. That is substantial, but it also implies a much longer simple payback period than the headline production growth might suggest.

That tension—exceptional business, powerful silver leverage, expensive upfront capital—is where I think the real investment debate begins.