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Nuclear Technology

15 companies

Japan has 15 operating reactors out of 32 operable, with the 7th Strategic Energy Plan targeting 20% nuclear by FY2040. The $40B US-Japan BWRX-300 SMR deal (Mar 2026) and data center power demand tripling by 2034 are accelerating restarts. NRA eased anti-terrorism deadlines (Apr 2026). 60+ year reactor lifetime extensions approved. European SMR momentum accelerating: Rolls-Royce SMR signed landmark UK contract with GBE-N for 3 SMRs at Wylfa (Apr 13, 2026; £599M govt loan); GVH-AFRY collaboration for BWRX-300 in Sweden (Apr 7, 2026); Swiss Council of States voted to lift nuclear ban (Mar 2026). Japanese supply chain companies positioned as critical global suppliers.

Recent Updates

2026-05-05evolve
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Deep evolve JSW (5631.T): METI BWRX-300 supplier designation + US-Japan $40B deal confirmed. Earnings date corrected May 8→May 13. Q3 standalone OP -37% YoY warning.

Updated: 5631.T

2026-04-22explore
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Prompt optimization discovered Teikoku Denki (6333.T) — canned motor pump monopoly (60% JP, 40% world). PE 10.49, zero debt. Hidden gem added to nuclear theme.

Updated: 6333.T

2026-04-21evolve
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Full financial cross-validation of all 14 nuclear stocks using StockAnalysis data. Organo best financials (ROE 23.5%, OpMar 21.4%). JSW strongest moat (80% global forgings). Yokogawa best risk/reward (Fwd PE 20.4, D/E 0.05). Kobe Steel/Kanadevia/Stella downgraded to LOW on poor fundamentals.

Updated: 6368.T, 7013.T, 5631.T, 6841.T, 6504.T, 6492.T, 6501.T, 6370.T, 5310.T, 6302.T, 7004.T, 5406.T, 6361.T, 4888.T

2026-04-21explore
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T-glass method applied to nuclear: found 9 missing companies. Added 5 to JSON: Toyo Tanso (HTGR graphite MONOPOLY), Okano Valve (BWR safety valve MONOPOLY), Kobe Steel (RPV duopoly), Ebara (NuScale pumps), Stella Pharma (BNCT drug MONOPOLY).

Updated: 5310.T, 6492.T, 5406.T, 6361.T, 4888.T

2026-04-16evolve
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European SMR momentum: GBE-N/Rolls-Royce Wylfa contract (Apr 13, £599M loan), GVH-AFRY Sweden BWRX-300 (Apr 7), Swiss nuclear ban lift vote (Mar). Yokogawa DPCS moves to active design phase. JSW/Hitachi European pipeline expanded.

Updated: 6841.T, 5631.T, 6501.T

Supply Chain Map

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Drag nodes to rearrange. Hover to highlight connections. Click tracked companies to view details. Arrows show supplier → customer direction.

Peer Comparison

CompanyTickerConvPEFwd PEP/BROEOp MarginD/EYieldFCF
IHI Corporation7013.THIGH23.7225.6526.8%8.8%108%0.64%+¥68B
Hitachi6501.TMEDIUM28.9627.583.7113.65%11.1%16%0.89%+¥1,390B
Japan Steel Works5631.THIGH33.531.13.59.09%8.4%34%0.96%-¥19.7B
Yokogawa Electric6841.THIGH38.823.82.511.5%13.7%5%1.25%+¥44B
Fuji Electric6504.TMEDIUM20.317.72.1911.8%10.3%13%1.52%+¥51B
Kanadevia7004.TMEDIUM10.97111.35.2%1.9%115%+2.70%-¥22.6B
Organo Corporation6368.THIGH27275.7321.7%20.6%24%1.20%+¥19B
Kurita Water Industries6370.TMEDIUM22.321.82.536.8%12.4%32%1.39%+¥25B
Sumitomo Heavy Industries6302.TMEDIUM19.3180.965.0%4.8%39%2.64%-¥2.3B
Toyo Tanso5310.TMEDIUM23.223.81.35.7%14.6%6%2.42%-¥5.8B (capex phase)
Okano Valve6492.TMEDIUM21.61.778.2%10.1%5%0.41%+¥624M
Kobe Steel5406.TLOW8.78.50.597.2%4.8%65%4.14%N/A
Ebara6361.TLOW30.925.44.4915.8%12.1%43%1.34%-¥51.5B (capex)
Stella Pharma4888.TLOW9.04-9.8%-23.6%29%0%N/A
Teikoku Denki6333.THIGH10.499.51.212%18%0%2.5%N/A

Companies

IHI Corporation

7013.THIGH

Equipment / SMR

13%

Japan's most direct SMR supply chain play: X-energy partnership (Mar 2026) positions IHI to supply fabricated nuclear components into the US market. N...

confirmedX-energyconfirmedNuScale PowerconfirmedGE Vernova+1 more

Hitachi

6501.TMEDIUM

Equipment / SMR

6%

HOLD — BWRX-300 pipeline strengthening but peak earnings flag raised. FY2025 results: revenue ¥10.59T (+8%), adjusted EBITA ¥1.31T (ALL-TIME RECORD), ...

confirmedGE Vernova (50/50 JV — GE Hitachi Nuclear Energy)confirmedOntario Power Generation (Canada)confirmedSaskPower (Canada)+2 more

Japan Steel Works

5631.THIGH

Materials / Forgings

16%

Near-monopoly on ultra-large nuclear-grade steel forgings (RPVs, steam generators). METI formally named JSW as BWRX-300 supply chain contributor along...

confirmedGE Vernova Hitachi / BWRX-300 (US)probableGVH / AFRY (Sweden)probableGVH / OSGE (Poland)+2 more

Yokogawa Electric

6841.THIGH

Controls / Instrumentation

15%

Signed exclusive DPCS contract with Rolls-Royce SMR (Feb 2, 2026) for global fleet control systems. APRIL 2026: GBE-N formally signed contract with Ro...

confirmedRolls-Royce SMR / GBE-NconfirmedSaudi AramcoconfirmedShell+3 more

Fuji Electric

6504.TMEDIUM

Nuclear Operations / Power Semi

8%

95% domestic share in nuclear radiation monitoring + top-5 global IGBT/SiC. Oct 2025 raised FY26 guidance (sales ¥1,185B, OP ¥128.5B, NI ¥89B) + inter...

confirmedJNFL RokkashoconfirmedHondaconfirmedRobert Bosch+2 more

Kanadevia

7004.TMEDIUM

Decommissioning / Waste

3%

Pure-play nuclear decommissioning & waste management via NAC International (US, spent fuel casks) and Tousou Mirai JV (TEPCO 67%/Kanadevia 33%) for Fu...

confirmedTEPCOconfirmedUS nuclear utilities (via NAC International)confirmedNippon Steel Engineering (merger partner)

Organo Corporation

6368.THIGH

Nuclear Operations / Water

16%

Near-monopoly on BWR condensate water treatment in Japan — IFD technology in ALL Japanese BWR condensate vessels since 1970. Every reactor restart = d...

confirmedAll Japanese BWR operators (IFD monopoly)confirmedTSMC Kumamoto JASM Phase 1 & 2confirmedRapidus Chitose+2 more

Kurita Water Industries

6370.TMEDIUM

Nuclear Operations / Water

5%

Dual semiconductor + nuclear water chemistry exposure with FY2026 full-year OP ¥50.8B (+15.5% YoY). Electronics segment (49% revenue): ultrapure water...

confirmedSamsung Electronics / SK HynixconfirmedJapanese nuclear utilitiesprobableTSMC Japan (Kumamoto)

Sumitomo Heavy Industries

6302.TMEDIUM

Nuclear Medicine / Fusion

4%

World's largest cryocooler manufacturer — irreplaceable in ITER fusion (confirmed procurement), MRI superconducting magnets, semiconductor ion implant...

confirmedITER OrganizationconfirmedKEK (J-PARC) and JAXAconfirmedSemiconductor manufacturers (US and China)+2 more

Toyo Tanso

5310.TMEDIUM

Materials / Forgings

5%

MONOPOLY: Only supplier of IG-110 nuclear-grade graphite used in ALL HTGRs globally (Japan HTTR, China HTR-PM, X-energy Xe-100). $40M X-energy supply ...

confirmedX-energy

Okano Valve

6492.TMEDIUM

Equipment

4%

MONOPOLY: Main Steam Safety Relief Valve (MS-SRV) installed in ALL BWR plants in Japan. World-first stellite overlay technology. Micro-cap (16B) = hug...

Kobe Steel

5406.TLOW

Materials / Forgings

2%

Only company globally self-sufficient in ALL RPV materials: forged shells + heavy steel plates + welding materials. Duopoly with JSW in nuclear forgin...

Ebara

6361.TLOW

Equipment

2%

Nuclear coolant pump supplier since 1973. NuScale SMR steam compressor partnership (Mar 2026). Large-cap diversified but nuclear is a growing catalyst...

confirmedNuScale Power

Stella Pharma

4888.TLOW

Nuclear Medicine / Fusion

1%

World ONLY producer of pharmaceutical-grade boron drug (Steboronin) for BNCT cancer therapy. Japan is 5+ years ahead of any country. Micro-cap (12B), ...

Teikoku Denki

6333.THIGH

Equipment

5%

Global canned motor pump monopoly — 60% Japan share, 40% world share. Zero-leak design is ONLY technology qualified for nuclear primary coolant loops....

confirmedAll Japanese nuclear utilities