Cameco (CCJ) Q3 2026: Key Lake Outage Lifts Uranium Unit Costs

Cameco's Q3 2026 results show rising uranium unit costs absorbing higher prices. In its third-quarter 6-K and earnings call on October 30, 2026, covering the quarter ended September 30, Cameco reported uranium revenue roughly flat year over year while profit fell sharply [1][2]. Three questions framed the quarter, and they got different answers. Prices held up revenue: Cameco delivered 5.6 million pounds at an average realized price of C$91.76 per pound, and uranium segment revenue was C$518 million versus C$523 million a year earlier [1]. Costs did not hold during the long Key Lake outage: the average unit cost of sales rose to C$72.17 per pound, and the company raised its full-year cost guidance [1]. Westinghouse adjusted EBITDA (Cameco's 49% share) rose 15% on its core fuel business, while US AP1000 definitive agreements remain unsigned [1]. Taken together, higher production costs absorbed the 2026 uranium price gains, while the cash cost of purchased material was roughly unchanged [1].

Cameco is a major global uranium producer headquartered in Saskatchewan, Canada. It operates the McArthur River mine and the Key Lake mill and owns 49% of Westinghouse [3]. Cameco sells uranium concentrate to nuclear utilities under long-term contracts; the uranium segment provides about 80% of revenue, and its gross margin depends on the mix of low-cost own production and purchased material [3].

Key Lake outage cut production and pushed unit costs above prior guidance

Third-quarter production fell well below the prior-year level. Cameco's share of uranium production was 3.5 million pounds, down 20% from 4.4 million pounds, and total packaged production at McArthur River/Key Lake (100% basis) was 1.6 million pounds versus 3.2 million pounds a year earlier [1]. This year's annual maintenance shutdown at the Key Lake mill installed new infrastructure and repaired major existing equipment, so it was planned to run longer than usual; it has carried over into the fourth quarter, and the company warns that restart challenges or commissioning delays could affect production [1]. Part of the decline reflects timing, because the 2025 outage at that operation fell in the second quarter, and its nine-month production was only 4% lower than last year [1]. Cameco narrowed full-year production guidance from 19.5-21.5 million pounds to 19.5-20.5 million pounds, which implies 5.9-6.9 million pounds of fourth-quarter production [1].

The cost increase came mainly from Cameco's own production. The third-quarter average unit cost of sales was C$72.17 per pound, compared with C$59.54 a year earlier and C$70.81 in the second quarter, and above the previous full-year guidance ceiling of C$67.50 [1][4]. The cash cost of produced uranium was C$40.73 per pound, up 62%, while the cash cost of purchased uranium was C$83.78 per pound, up only 2% [1]. Management attributed the increase to fixed costs spread over lower production during the outage, inflation in labor and supplies, and maintenance of aging infrastructure, and said it sees no change in ore grade or reserves [1][2]. The company did not disclose how much each factor contributed.

Higher costs offset higher prices and cut uranium gross profit by 30%

Uranium segment gross profit fell 30%, mainly because of higher costs. Third-quarter gross profit was C$111 million versus C$158 million a year earlier, and the gross margin fell from 30% to 21% [1]. Cameco's gross profit bridge shows higher costs reduced gross profit by C$71 million and lower sales volume by C$13 million, while higher US-dollar prices added C$28 million and foreign exchange added C$9 million [1]. The 8% increase in the Canadian-dollar realized price was fully offset by the 21% rise in unit cost.

The higher full-year cost guidance indicates the pressure is not limited to one quarter. Cameco raised its 2026 average unit cost of sales guidance from C$63.00-67.50 per pound to C$67.00-70.00, citing the narrowed production guidance and inflation [1]. At the midpoints, that adds roughly C$100 million of full-year cost; if both cost and delivery guidance land at their midpoints, the implied fourth-quarter unit cost is about C$73 per pound.

Conclusion

This report weakens the case that Cameco converts higher uranium prices into 2026 profit. The growth side changed little, with the realized price inside the company's C$91-96 per pound guidance range [1]. Cash generation was also weak: operating cash flow for the first nine months was C$112 million versus C$731 million a year earlier, which the company attributed to higher income taxes paid and higher working capital requirements [1].

Whether costs come down depends on how much of the pressure fades with the outage. If Key Lake restarts smoothly in the fourth quarter, part of the cost pressure could ease, but the inflation component cannot be separated from the disclosures. The next evidence includes fourth-quarter production, whether full-year unit cost stays within C$70 per pound, whether the new McArthur River technical report raises long-term operating costs, and Cameco's 2027 cost guidance [1]. At Westinghouse, US definitive agreements and the advance payment under the US-Korea framework are still pending [1].

Sources

[1] CCJ Q3 2026 MD&A 6-K filed 2026-10-30, October 30, 2026, Cameco 6-K (third-quarter management's discussion and analysis), https://www.sec.gov/Archives/edgar/data/1009001/000119312526439858/d106072dex992.htm [2] CCJ Q3 2026 earnings call 2026-10-30, October 30, 2026, Cameco third-quarter earnings call, drillr://earning_call_summary/CCJ/2026-10-30 [3] CCJ FY2025 40-F filed 2026-03-19, March 19, 2026, Cameco 40-F (2025 annual report), https://www.sec.gov/Archives/edgar/data/1009001/000119312526116229/d34605dex993.htm [4] CCJ Q2 2026 6-K filed 2026-07-31, July 31, 2026, Cameco 6-K (second-quarter management's discussion and analysis), https://www.sec.gov/Archives/edgar/data/1009001/000119312526326768/d125942dex992.htm