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Cambridge, MA, USA · Private · cambridgeheavy.xyz
Inertial fusion; out of stealth Oct 2026 with $6.2M seed
Open roles
—
no public job board
Federal awards
—
none found
Last private raise
$7.2M
Form D · 2026-09-22
SEC filings
1
latest 2026-10-07
POLICYDOE adds helium to the Critical Material List
DOE added helium to its Critical Material List, citing semiconductors, natural-gas leak testing and quantum computing. Helium also cools fusion magnets and high-temperature gas reactors. Affects Fusion.
+ THESISHow it works
Lasers or pulsed power crush a tiny fuel pellet from every side in billionths of a second, so it fuses before it can fly apart. A power plant would repeat this several times a second.
OPEN IN 3D →Read from SEC 8-Ks (bankruptcy, default, delisting, restatement, impairment, restructuring), cash runway in annual reports, Form D raises and the 30-day hiring trend. A prompt to look closer, not a credit rating.
No public job board on Greenhouse, Lever or Ashby, so hiring isn't tracked for this company yet.
Companies file a Form D within 15 days of selling shares privately. “Sold” is the amount raised so far in that offering; amended notices (D/A) update earlier ones.
| First sale | Notice | Offered | Sold |
|---|---|---|---|
| 2026-09-22 | D · filed 2026-10-07 | $8.5M | $7.2M |
No federal grants, contracts or loans found on USAspending.gov under this company's US entity name.
Sources: company job boards (daily), SEC EDGAR, USAspending.gov, and the reviewed technology spreadsheets. Public records only cover US entities, so foreign companies and private firms that don't file will show gaps.
STEP 2/4 · AT RISK REBCO superconducting tapeHigh-temperature superconducting magnets use a rare-earth barium copper oxide layer.
STEP 3/3 · WATCH Copper-intensive technologiesMagnet coils and stabilizers; also every grid and transmission project.
Policy that applies
No minerals, policies or partners linked yet. Add them in the review spreadsheet.
Only Form D notices on file (shown at left).