Nuclear Energy Stocks: Three Businesses Sharing One Label

Three businesses under one label

Most lists of nuclear stocks rank the names by recent price moves. That hides the more useful question: how does each company get paid, and when?

A fuel seller gets paid per pound delivered. A plant owner gets paid for power, often under long contracts. A developer mostly spends cash today in the hope of selling power or reactors later.

You can pull up each one on its MarketPlays symbol page: Cameco, Constellation and Oklo.

The fuel: what Cameco's quarter shows

Cameco is the easiest of the three to measure, because it reports pounds. Pounds mined, pounds bought, pounds it expects to mine for the year.

The guidance line is the one to read twice. Cameco now expects its share of 2026 production to land between 19.5 million and 20.5 million pounds. The earlier range was 19.5 million to 21.5 million pounds (Cameco Q3 2026 results). The bottom of the range held and the top came down by a million pounds.

That is a small change, and it tells you something about mining. Output is set by ore, equipment and crews, and those don't speed up because demand is strong. A fuel company's sales are capped by what it can dig up or buy.

Cameco also owns part of Westinghouse, which works on reactors. That piece ran in the red for the quarter. Cameco's share of the Westinghouse net loss was $24 million, reported in Canadian dollars (Cameco Q3 2026 results).

So one ticker holds two businesses. An investor who buys Cameco for uranium also gets a slice of a reactor company, with its own profits and losses each quarter.

The plants: Constellation and the Crane restart

Plant owners sell power. The clearest example of how that gets priced came on September 20, 2024, when Constellation (CEG) said it had signed a 20-year power purchase agreement with Microsoft (Constellation release, September 2024).

The deal backs the restart of Three Mile Island Unit 1, renamed the Crane Clean Energy Center. Before the plant was retired in 2019 it had a generating capacity of 837 megawatts, based on the same release.

Two things stand out for anyone reading it as an investor. The first is the length. A 20-year contract with one large buyer gives a plant owner a long view of its sales from that site, which is rare in the power business.

The second is the wait. The contract was signed in 2024, and the release said the plant was expected to be online in 2028. Money goes in for years before the first power is sold.

Constellation runs other nuclear plants too, so Crane is one project inside a much larger company. Its annual report on Form 10-K lists the full fleet and how much power it made, which is the place to size Crane against the rest.

The developers: Oklo's 10-Q

Oklo (OKLO) sits at the other end from Cameco. It is building toward a reactor business, and its filings are mostly about cost.

For the nine months ended September 30, 2026, Oklo reported a net loss of $123.3 million and a loss from operations of $195.2 million. Net cash used in operating activities was $110.9 million (Oklo Q3 2026 Form 10-Q).

"The Company continues to incur significant operating losses."

Those three numbers answer different questions. Loss from operations is what the business itself cost to run. Net loss adds in items outside operations, which is why it can be smaller. Cash used in operations is the money that left the bank account.

For a company at this stage, the cash figure is the one investors often track most closely. Put it next to the cash and investments on the balance sheet in the same filing and you get a rough sense of how long the company can keep spending at that pace before it needs to raise more.

These figures cover nine months of cost, with $110.9 million of operating cash used over the period. For timing on Oklo's first reactor, read the management discussion section of the same 10-Q, which this post doesn't quote.

How the three behave together

Here is an illustrative example, with no real portfolio behind it. Say an investor splits a sum equally across Cameco, Constellation and Oklo and calls it a nuclear position.

The three holdings answer to different news. Cameco's stake moves on items like the October guidance change, which took the top of its 2026 production range from 21.5 million pounds to 20.5 million (Cameco Q3 2026 results). The Constellation stake is tied in part to whether Crane still comes online in 2028, the year given in the September 2024 release. For Oklo, investors often watch cash used in operations, which was $110.9 million over the nine months ended September 30, 2026 (Q3 2026 Form 10-Q). On some days all three trade as one theme, and on others they split apart.

That is why the filing to read differs by company:

• Cameco: the quarterly results release, for production, purchases and the yearly guidance range.
• Constellation: the Form 10-K and quarterly reports, for fleet output and updates on Crane.
• Oklo: the Form 10-Q, for operating loss, cash used and cash on hand.

To see which other tickers get grouped with these, start at the MarketPlays tag index or the trending names on Explore.

Key takeaways

• Nuclear stocks fall into at least three groups: fuel sellers, plant owners and reactor developers. Each gets paid in a different way and on a different clock.
• Cameco produced 3.5 million pounds of uranium (its share) in Q3 2026 and trimmed the top of its 2026 guidance to 20.5 million pounds from 21.5 million (Cameco Q3 2026 results).
• Constellation's 20-year agreement with Microsoft supports an 837 megawatt plant that, as of the September 2024 release, was expected online in 2028.
• Oklo used $110.9 million of cash in operations over the nine months ended September 30, 2026, and says it continues to incur significant operating losses (Q3 2026 Form 10-Q).
• All figures here come from the companies' own releases and filings, and newer ones may have replaced them.

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