Small Modular Reactors: 10 Companies Are Racing to Build One. Here's What the SEC Filings Say About Their Timelines

Introduction

The pitch is hard to resist. Small modular reactors will produce clean, reliable, baseload power at a fraction of the cost and construction time of conventional nuclear plants. They will power data centers for the AI boom, replace retiring coal plants, and solve the intermittency problem that limits wind and solar. They are the future of energy.

That future may arrive. But the SEC filings tell a different story about when.

As of early 2026, at least ten publicly traded companies are pursuing small modular reactor designs. Most of them went public through SPAC mergers. Nearly all are pre-revenue. Several have pushed back their deployment timelines by years. And the most advanced of the group, NuScale Power, saw its flagship project collapse in 2023 after cost estimates ballooned from $5.3 billion to $9.3 billion.

This is not an article about whether SMRs will work. The physics is sound, the engineering is achievable, and the demand is real. This is an article about whether the companies currently trading on public markets are the right way to bet on that future, and what the filings reveal about the gap between the investor presentation and the reality on the ground.

The SMR Promise

To understand why investors are excited, you need to understand what SMRs offer compared to conventional nuclear and other energy sources.

Why the Thesis Is Compelling

• Baseload clean power. Unlike solar and wind, nuclear generates electricity 24/7 regardless of weather or time of day. For data centers, hospitals, military installations, and industrial operations that need continuous power, this is not a nice-to-have. It is a requirement.
• AI data center demand. The explosion in AI compute has created unprecedented demand for reliable, high-capacity power. Major tech companies (Microsoft, Google, Amazon) have signed letters of intent or memoranda of understanding with SMR developers. This is the demand catalyst that did not exist five years ago.
• Factory manufacturing. Unlike conventional nuclear plants (which are built on-site over a decade), SMRs are designed to be manufactured in a factory and shipped to the installation location. This is supposed to reduce costs through standardization and learning curves.
• Smaller footprint. A 300 MW SMR requires far less land and cooling infrastructure than a 1,000 MW conventional plant. This makes siting easier and opens locations that would not support a traditional reactor.
• Government support. The U.S. Department of Energy has awarded billions in grants, loan guarantees, and cost- sharing agreements to SMR developers. The Inflation Reduction Act (IRA) provides production tax credits for nuclear energy. Bipartisan support for nuclear has reached levels not seen in decades.

Why the Thesis Needs Scrutiny

Every one of those advantages is real on paper. The question is whether they are real in practice, at what cost, and on what timeline. Nuclear energy has a decades-long history of cost overruns, schedule delays, and regulatory battles that turned promising projects into financial disasters. The next generation of reactor developers claims to have solved these problems. The filings suggest they have not solved them yet.

The NuScale Lesson

NuScale Power (NYSE: SMR) is the most important case study in the SMR sector, and not only because it was the first. It is important because its trajectory illustrates every risk that investors in this space need to understand.

The Timeline

1. 2007: NuScale begins developing its light-water SMR design at Oregon State University.
2. 2016: NuScale submits its design certification application to the Nuclear Regulatory Commission (NRC).
3. 2020: NRC issues the first-ever SMR design certification in U.S. history. NuScale announces the Carbon Free Power Project (CFPP) with Utah Associated Municipal Power Systems (UAMPS) at Idaho National Laboratory.
4. 2022: NuScale goes public via a SPAC merger with Spring Valley Acquisition Corp. at a roughly $1.9 billion enterprise value.
5. 2023: The CFPP cost estimate rises from $5.3 billion to $9.3 billion. The per-MWh cost jumps from $58 to $89. UAMPS members begin withdrawing. The project is cancelled in November 2023.
6. 2024-2025: NuScale pivots to international markets and data center customers, signing MOUs but not binding construction contracts.

From founding to first NRC certification: 13 years. From certification to commercial operation: still zero. The only project with a committed site, a utility customer, and federal cost-sharing was cancelled because the economics did not work.

What the Filings Revealed

NuScale's 10-K filings throughout this period contained disclosures that, in retrospect, clearly flagged the risks:

• Revenue was zero in every reporting period. The company was entirely funded by DOE cost-sharing agreements and investor capital.
• The risk factors section explicitly warned that the CFPP might not proceed and that cost estimates were preliminary.
• Going concern language appeared in multiple filings, warning that the company needed additional capital to continue operations.
• Related-party disclosures showed significant management compensation relative to the absence of commercial revenue.
• The share count increased substantially post-SPAC merger through warrant exercises, PIPE conversions, and additional equity raises.

None of this was hidden. It was all in the filings. The challenge is that most investors read the press releases but not the 10-K.

The Public Company Landscape

NuScale is the most well-known, but it is not alone. Here is a snapshot of publicly traded SMR-related companies and what their filings disclose about their current status:

Notice the pattern. The companies that are already generating revenue (BWX Technologies, Centrus, Cameco) are not actually building SMRs. They are suppliers to the industry. The companies that are building SMRs (NuScale, Oklo, X-energy, Nano Nuclear) are pre-revenue, years from deployment, and funded by a combination of government grants and investor capital.

This distinction matters enormously. Investing in a uranium miner that benefits from any nuclear expansion is a fundamentally different proposition from investing in a pre-revenue reactor developer that must navigate NRC licensing, site permitting, construction, and commercialization before generating a single dollar.

What the SEC Filings Actually Say

Investor presentations show renderings of SMR plants, timelines with commercial operation dates, and total addressable market estimates in the hundreds of billions. The SEC filings tell a more nuanced story. Here is what to look for:

Revenue and Cash Burn

For pre-revenue SMR developers, the income statement is straightforward: revenue is zero (or nearly zero), and operating expenses consume cash every quarter. The critical number is the burn rate and the remaining runway.

• What is the quarterly cash burn? How many quarters of runway remain at the current rate?
• Is the company recognizing government grant revenue, and if so, what are the conditions attached?
• How much of reported revenue (if any) comes from engineering services versus reactor deployment?
• What are the capitalized development costs on the balance sheet? Are they amortizing or accumulating?

Going Concern Disclosures

Multiple SMR companies have received going concern qualifications from their auditors. This means the auditor questions whether the company can continue operating for the next 12 months without additional funding. It is the single most important sentence in the entire 10-K.

When a company with no revenue, no product, and a decade-long development timeline receives a going concern warning, it means the company needs to raise money again before it generates any. Every capital raise dilutes existing shareholders.

Risk Factor Disclosures

The risk factors sections of SMR company filings are unusually detailed because the risks are unusually severe. Common disclosures include:

• NRC licensing risk. The NRC review process can take 3-5 years or longer. Applications can be denied (as Oklo's was in 2022). Design changes during review restart the clock.
• Construction cost uncertainty. No SMR has been built at commercial scale in the United States. Cost estimates are based on projections, not actuals. The NuScale CFPP demonstrated that projections can be wrong by 75% or more.
• HALEU fuel supply. Several advanced SMR designs require high-assay low-enriched uranium (HALEU), which is currently not produced at commercial scale in the U.S. The supply chain for HALEU is a constraint that multiple filings flag as a material risk.
• Political and regulatory risk. Nuclear energy is subject to federal, state, and local regulatory oversight. Changes in administration, shifts in public sentiment, or new environmental regulations can delay or block projects.
• Customer concentration. Many SMR developers have signed MOUs or letters of intent with a small number of potential customers (often tech companies or utilities). An MOU is not a contract. It is a statement of interest. If those customers choose a different technology or delay their power needs, the pipeline evaporates.

The Timeline Problem

The nuclear industry has a long and well-documented history of timeline slippage. The Vogtle Units 3 and 4 expansion in Georgia, which used conventional large-reactor technology, was originally projected to cost $14 billion and begin operating in 2016-2017. It ultimately cost over $35 billion and started commercial operation in 2023-2024. That is a 7-year delay and a 150% cost overrun on a design that had already been built elsewhere.

SMR proponents argue that their designs avoid these problems through factory manufacturing, smaller scale, and simpler systems. That may prove true. But no one has demonstrated it yet in the U.S. at commercial scale. The timeline track record of the publicly traded SMR companies so far is:

• NuScale: 16+ years from founding to design certification. Zero commercial units built or under construction.
• Oklo: First NRC application denied. Resubmitted. No construction permit. No timeline to commercial operation confirmed.
• X-energy: DOE Advanced Reactor Demonstration Program recipient. Demo project timeline has slipped. No commercial units.
• Nano Nuclear: No NRC submission. Concept stage for micro-reactors.

Why Timelines Matter for Investors

For a pre-revenue company burning cash every quarter, every year of delay means:

1. More dilution. The company must raise additional capital to fund operations. Each raise dilutes existing shareholders.
2. Greater execution risk. Management teams change. Key engineers leave. Government policy shifts. The longer the timeline, the more things can go wrong.
3. Competitive landscape changes. Other technologies (natural gas, battery storage, enhanced geothermal, fusion) continue to advance. A reactor design that looks competitive today may be uneconomic by the time it reaches the market.
4. Discount rate compression of the thesis. A dollar of revenue in 2035 is worth much less than a dollar of revenue in 2028 in discounted cash flow analysis. Every year of delay reduces the present value of the investment.

Red Flags to Watch For

Not every SMR company is the same. But the filings reveal common patterns that should trigger additional scrutiny:

1. MOUs Presented as Revenue Pipeline

A memorandum of understanding is not a contract. It is not binding. It does not obligate the counterparty to purchase anything. When a company announces an MOU with a tech company or utility and the stock price jumps 30%, ask: what are the binding terms? What are the off-ramps? What happens if the customer walks away?

Check the 8-K filing that accompanies the announcement. If the MOU is not filed as a material agreement, it likely has minimal binding obligations.

2. SPAC Origin With Aggressive Projections

SPAC mergers allow companies to publish forward-looking financial projections that would not be permitted in a traditional IPO. Many SMR companies went public via SPAC and included revenue projections showing billions in revenue by the early 2030s. Compare those original projections (filed in the S-4 or proxy statement) to the current reality. If a company projected $500 million in revenue by 2026 and currently has zero, the credibility of all future projections is diminished.

3. Executive Compensation Disconnected From Milestones

Check the proxy statement (DEF 14A) for executive compensation details. If the CEO of a pre-revenue company with no operating reactor is receiving $5-10 million in total compensation, ask what milestones justify that pay. Compare the compensation to the company's cash balance and burn rate.

4. Frequent Equity Raises at Declining Prices

Track the S-3 and prospectus supplement filings. If the company is raising capital every few months at progressively lower share prices, it is in a dilution spiral. Each raise at a lower price destroys more shareholder value and signals that the market is losing confidence.

5. Timeline Revisions Without Explanation

Compare the timelines in the most recent 10-K to those in the prior year. If the target date for NRC certification, construction start, or commercial operation has moved back, there should be a clear explanation in the MD&A section. Vague language like “we continue to make progress” without specific milestones achieved is a red flag.

6. No Binding Customer Contracts

There is a difference between “we have multiple customers interested in our technology” and “we have a signed Engineering, Procurement, and Construction (EPC) contract with a fixed price and delivery date.” Search the exhibit list in the 10-K for material agreements. If there are no filed customer contracts, the pipeline is aspirational.

How to Spot Genuine Progress

Not everything in this sector is hype. Some companies are making real, measurable progress. Here is what genuine progress looks like versus narrative momentum:

The companies that are closest to genuine commercial deployment are the ones with NRC construction permits, committed sites, signed fuel supply agreements, and DOE cost-sharing awards with active milestone disbursements. Everything else is earlier stage than it appears.

How to Investigate an SMR Company

If you are considering investing in any SMR or nuclear technology company, here is the due diligence checklist. Every item can be verified through publicly available sources:

Step 1: Read the Most Recent 10-K, Cover to Cover

• Search for "going concern." If it appears, the auditors question survival.
• Read every paragraph of the risk factors section. These are the company's own admissions of what could go wrong.
• Check the MD&A for timeline changes compared to the prior year's filing.
• Examine revenue recognition policies. Is the company recognizing government grants as revenue?

Step 2: Pull the Original SPAC Projections

• Find the S-4 or proxy statement filed for the SPAC merger.
• Extract the revenue and profitability projections that were presented to SPAC shareholders.
• Compare those projections to actual results. Calculate the variance.
• If the company is years behind its own projections, discount all future estimates accordingly.

Step 3: Track NRC Status

• The NRC ADAMS database (Agencywide Documents Access and Management System) contains every application, review document, and correspondence between SMR developers and the NRC.
• Check whether the company's design certification or construction permit application is actively under review, in pre-application, or has been denied.
• Look for NRC staff safety evaluation reports, which indicate how far the review has progressed.
• Track any Requests for Additional Information (RAIs) from the NRC. A large number of RAIs suggests the application has issues.

Step 4: Verify Customer Commitments

• Search the 10-K exhibit list for filed customer contracts.
• Cross-reference announced MOUs with 8-K filings. Was the MOU filed as a material agreement?
• Contact the counterparty's investor relations for their perspective on the agreement.
• For utility customers, check their own regulatory filings (with state public utility commissions) for SMR procurement plans.

Step 5: Map the Capital Structure

• Calculate the fully diluted share count (common shares + options + warrants + convertible notes).
• Track the total capital raised since the SPAC merger versus the total cash remaining.
• Calculate the quarterly burn rate. Divide remaining cash by burn rate. That is the runway.
• Identify any upcoming debt maturities that could trigger forced dilution.

Step 6: Check Insider Activity

• Pull all Form 4 filings from SEC EDGAR.
• Are insiders buying or selling? At what prices relative to the SPAC promote price?
• Check for SPAC sponsor shares that were acquired for pennies and are now being sold at dollars.
• Look for 10b5-1 selling plans filed shortly after lock-up expiration.

The Takeaway

Small modular reactors may genuinely transform the energy landscape. The physics works. The demand from data centers is real and growing. Government support is the strongest it has been in a generation. If even one SMR design achieves commercial deployment at the projected costs, it will unlock a massive market.

But “may” and “if” are doing a lot of work in that paragraph.

The SEC filings show that most publicly traded SMR companies are pre-revenue, burning cash, years from NRC certification (let alone commercial operation), and funded by serial equity raises that dilute shareholders with every round. The most advanced project in the country was cancelled when costs nearly doubled. And the companies generating real revenue from nuclear (Cameco, BWX Technologies, Centrus) are suppliers to the industry, not reactor developers.

None of this means you should avoid the sector entirely. It means you should know what you are buying, what stage the company is actually at (versus what the investor deck implies), and what the filings disclose about the gap between the vision and the execution.

The pitch deck shows a reactor powering a data center. The 10-K shows a company that needs to raise money again next quarter. Both documents are describing the same company. Only one of them is audited.

Read the filings. Do the math. Invest in the reality, not the rendering.