Tokamak Energy Ltd

Among the most de-risked of the pre-commercial fusion names because the magnet IP throws off real near-term cash: an HTS-magnet business with a £70M anchored UK STEP contract, US defense revenue (DARPA/General Atomics MHD subs), and a fusion-relevant 11.8 T Demo4 system — so the company is paid to develop the single hardest fusion subsystem regardless of when net-energy arrives.

• TE Magnetics is a genuine commercial business, not a slide: £70M STEP magnet-systems contract (Apr 2026, runs to Mar 2029) makes it the UK's sole HTS/high-field magnet supplier for the national fusion program — recurring, government-backed revenue.
• US defense pull: contracted by General Atomics for DARPA's PUMP program (HTS magnets for next-gen silent submarine MHD propulsion) — a non-fusion market that validates and monetizes the magnet IP.
• Demo4 hit 11.8 T at fusion-relevant conditions (Nov 2025), 7M ampere-turns, 100+ ramp cycles without degradation — plus Ultra Compact Insulation enabling ~15 T; magnets are widely seen as the binding constraint for compact fusion, and TE owns vertically-integrated capability (Ridgway acquisition).
• ST40 records (Dec 2025): 1 MA plasma current and triple product ~8×10¹⁸ m⁻³·keV·s — reported best of any privately-owned tokamak — achieved in <1 m³ plasma volume (15× smaller than peers at the 100M°C milestone), supporting the compact-cost thesis.
• Blue-chip strategic backers with industrial logic: Furukawa Electric (owns SuperPower, a key HTS-tape supplier — vertical alignment), BW Group, Sabanci, plus government co-funding (DOE Milestone program, 10+ INFUSE awards, FIRE collaborative).
• Optionality: even if fusion net-electricity slips a decade, the magnet business addresses data-center power, e-aviation motors, maglev, particle accelerators and MRI-class instruments — a $6B+ HTS market growing ~28% CAGR.

This is still pre-revenue-at-scale fusion: commercial net-electricity is a decade-plus away with deep scientific and engineering risk, the company has raised only ~$336M versus multi-billion-funded tokamak rivals (Commonwealth ~$3B), no 2026 round or valuation is confirmed, and the magnet contracts — while real — are far too small to fund a ~200 MWe pilot plant. Financing-gated, non-US, speculative.

• Capital gap is the core risk: ~$336M raised vs. Commonwealth Fusion ~$3B, Helion ~$1.5B, TAE ~$1.8B. A grid-scale pilot (ST-E1) plausibly needs billions; no priced 2026 round or fresh valuation has surfaced — dilution/financing risk is acute.
• Fusion timeline is long and historically slips: ST-E1 'early 2030s / up to 200 MWe' is a target, not a plan; net-energy gain, tritium breeding, materials survivability under neutron flux, and balance-of-plant remain unsolved at commercial scale industry-wide.
• Triple product ~8×10¹⁸ is a record for a private tokamak but still well short of the ~10²¹ Q≈1 regime; the gap to a burning plasma is large and not closed by magnets alone.
• Spherical-tokamak geometry concentrates neutron/heat loads on a slim center column and complicates the inboard shield/breeding blanket — a recognized hard problem for the compact ST path specifically.
• The magnet business, though commercializing, is low-tens-of-£M scale and partly competes with deeper-pocketed/vertically-integrated suppliers (Fujikura — itself selected for STEP — Faraday Factory, MetOx, SuperPower/Furukawa); margins and durable share unproven.
• Non-US, private, illiquid: no public price, no audited financials, opaque valuation, and (per the mandate) analysis-only — not investable as a buy for a US-framed book; any exposure is via private secondaries with wide bid/ask.