New York, March 3, 2026, 08:43 EST — Premarket
- Denison Mines (DNN) rose about 4.4% in U.S. premarket trading.
- Focus is on Phoenix construction timing and balance-sheet capacity as the company shifts into execution.
- Partner Cosa expanded land tied to joint ventures with Denison in Saskatchewan’s Athabasca Basin.
Shares of Denison Mines Corp rose 18.5 cents, or about 4.4%, to $4.37 in U.S. premarket trading on Tuesday. The Canadian uranium developer closed the prior session at about $4.19.
The early move comes as investors focus on Denison’s push toward construction at its Phoenix uranium project in Saskatchewan, a step that would move the story from permitting and planning into spending and delivery. “Making a Final Investment Decision … marks the beginning of a new era in Denison’s history,” CEO David Cates said in a Feb. 24 company release. 1
Uranium-linked stocks were broadly higher before the bell, which helped the tone around developers. Cameco was up about 6%, Uranium Energy rose about 2.5%, and Energy Fuels gained around 9.5% in premarket trading.
Cosa Resources, a Denison partner in the Athabasca Basin, said it added six claims totalling 2,669 hectares to the Darby, Murphy Lake North and Orion projects. Cosa, which said it operates the Murphy Lake North and Darby joint ventures with a 70% stake while Denison holds 30%, pointed to the ground as extending conductive trends near Cameco’s Cigar Lake mine and IsoEnergy’s Hurricane deposit. “All claims were acquired at low cost with no royalties and capture the interpreted extensions of known conductive trends,” said Justin Rodko, Cosa’s vice president of corporate development. 2
In its March investor update deck, Denison said construction at Phoenix is planned to begin in March after final federal approvals in February, with total engineering about 87% complete and grid power now available via a new SaskPower transmission line. It said the construction management contract went to Wood Canada, procurement for the planned 2026 build was nearly complete and remaining contract awards were expected in early 2026, with first production targeted for mid-2028. The deck also put Denison’s cash, physical uranium and investments at about C$718 million as of Sept. 30, including 1.9 million pounds of U3O8 with a market value around C$217 million. 3
Phoenix is designed as an in-situ recovery, or ISR, mine — uranium is dissolved underground and pumped to the surface for processing. It’s a different bet than digging a conventional hard-rock mine, and execution will matter more than slides now.
But the downside case is familiar: construction can slip, costs can climb, and uranium prices can swing hard. If that mix turns, development-stage miners tend to wear it first.
For now, traders will watch whether DNN holds its premarket gains after the open and whether more exploration updates land from partners working around Denison’s Wheeler River project. Any new contracting for future uranium sales could also move the tape.
The next set date is March 24, the record date for voting ahead of Denison’s May 12 annual meeting in Toronto, a U.S. filing showed. Before that, the first visible catalyst may be simpler: signs that Phoenix site work is actually under way this month. 4
