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Small modular reactors (SMR)

The 9 companies in this industry listed on the NYSE and Nasdaq are worth $14 bn combined; the largest are Oklo Inc. (OKLO), X-Energy, Inc. (XE) and NuScale Power (SMR). For each one: what it does, revenue, margin, free cash flow over the last five years and a score from 0 to 10.

Data as of October 2026

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9 companies value 14 bn revenue 0.2 bn margin -575.7% free cash flow -1.6 bn avg. score 0.6
OKLO holds 36.9% of the group's value, 1.2x the runner-up · SMR leads the industry without being the largest
Rank Ticker Company Share Value Revenue Margin FCF 5 years FCF/px Yield What it does · why it is here
1 OKLO Oklo Inc.
United States · score 0.0
37% 5.1 bn 0.0 bn -126x -0.3 bn -5.4% — Liquid-metal nuclear microreactors · Microreactors for data centers; pre-revenue, backed by major investors
2 XE X-Energy, Inc.
United States · score 0.2
31% 4.3 bn 0.2 bn -272.3% -0.4 bn — -10.3% — Advanced nuclear reactors and TRISO fuel · Delaware — revenue of $165m
3 SMR NuScale Power
United States · score 0.0
18% 2.4 bn 0.0 bn -39x -0.8 bn -31.9% — NuScale small modular nuclear reactors · The only modular reactor design approved by the US regulator. Pre-revenue
4 NNE Nano Nuclear Energy
United States · score 0.1
5% 0.7 bn — — -0.0 bn -5.4% — Advanced nuclear microreactors · Microreactors in development for remote sites
5 GFUZ General Fusion Group Ltd.
Canada · score 0.0
3% 0.4 bn — — -0.0 bn -2.4% — Magnetized target fusion energy · Canada
6 IMSR Terrestrial Energy Inc. /DE/
United States · score 0.5
2% 0.3 bn — — -0.0 bn -8.3% — Molten salt nuclear reactors · North Carolina
7 NKLR Terra Innovatum Global N.V.
Italy · score 1.3
2% 0.3 bn — — -0.0 bn -6.7% — Micro-modular nuclear reactors · Italy
8 FISN DEEP FISSION, INC.
United States · score 0.0
2% 0.2 bn — — -0.1 bn -24.1% — Modular nuclear reactors installed in deep boreholes · California
9 HDRN Hadron Energy, Inc.
United States · score 2.9
0% 0.0 bn 0.0 bn — 0.0 bn — -10.6% — Modular nuclear energy · California

Other industries in the same sector

What this is. A catalogue, not a guide. Every industry with stocks listed on the NYSE or NASDAQ, the companies contending for its leadership, what each one does according to its own annual report, and the balance sheet it filed with the SEC.

The score runs from 0 to 10 and compares each company with every other one in the almanac on cash generation, profitability, debt, dividends and consistency over the last five years. The higher it is, the better the company fares in that comparison. Curious how much each part weighs? Ask at the bottom of the page.

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