Who are the leading uranium mining companies?

Kazatomprom (KZ), Cameco (Canada), Orano (France).

Which uranium mining companies are publicly traded?

Kazatomprom (KAP.L), Cameco (CCO.TO / CCJ).

How big is the nuclear & small reactors market?

For the whole nuclear & small reactors market, not this segment alone: installed capacity (operable reactors, net) (world) 405,667 MWe (443 reactors), 2026 — World Nuclear Association.

Uranium mining

About three-quarters of mined uranium comes from Kazakhstan, Canada and Namibia; ten companies produced over 90% (2022).

3 leading companies in uranium mining, one segment of nuclear & small reactors — SMRs, reactor restarts, new large builds and the uranium/enrichment fuel chain behind them

new market segment · researched 2026-11-14

Small modular reactors (SMRs)Large nuclear reactors Reactor restarts & life extensionsUranium miningUranium enrichment & HALEU Nuclear fuel & components

Leading uranium mining companies

3 companies, with the scale each source states. Scale is the whole company's unless the row says otherwise.

Company	Where	What they do	Scale
Kazatomprom KAP.L ↗	Astana, KZ since 1997	World's largest uranium miner (in-situ leach mines in Kazakhstan)	uranium production: 12,463 tonnes U (21% of world) (2024) ↗
Cameco CCO.TO / CCJ ↗	Saskatoon, Canada since 1988	Uranium miner (McArthur River/Key Lake, Cigar Lake), conversion and fuel services; 49% owner of Westinghouse	revenue: 3.482 CAD billions (2025) ↗
Orano ↗	Châtillon (Paris), France since 2001	Uranium mining, Georges Besse II enrichment plant, planned Project Ike enrichment plant at Oak Ridge, TN	enrichment capacity: 7,500 thousand SWU/yr (10,000 projected 2030) (2025) ↗

In Canada

2026-10Canada produced 24% of the world's mined uranium in 2024, second to Kazakhstan. Cameco's McArthur River/Key Lake (7,808 tU) and Cigar Lake (6,501 tU) were the world's two largest mines. ↗

The nuclear & small reactors market

The whole market this segment sits in.

installed capacity (operable reactors, net) · world405,667

MWe (443 reactors) · 2026

↗

Growth, segments, risks and every company in nuclear & small reactors →

Quick answers

What is uranium mining?: About three-quarters of mined uranium comes from Kazakhstan, Canada and Namibia; ten companies produced over 90% (2022). It is one segment of the nuclear & small reactors market.
Who are the leading uranium mining companies?: Kazatomprom (KZ), Cameco (Canada), Orano (France).
Which uranium mining companies are publicly traded?: Kazatomprom (KAP.L), Cameco (CCO.TO / CCJ).
Which Canadian companies are in uranium mining?: Cameco, Saskatoon.
How big is the nuclear & small reactors market?: For the whole nuclear & small reactors market, not this segment alone: installed capacity (operable reactors, net) (world) 405,667 MWe (443 reactors), 2026 — World Nuclear Association.