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Reg CFTRL65.4–6.5Tier IOpen

Hearth Reactor Works

Hearth Microreactor, Series A

Preferred equity in a five megawatt heat-pipe reactor with a witnessed prototype and no pumps to fail.

Heat pipes move heat by evaporation and condensation inside a sealed tube. No pumps, no coolant loop, no loss-of-flow accident to design against. Hearth has demonstrated a full-power thermal prototype under third-party witness at a national laboratory and is preparing a construction permit application for a five megawatt unit at Idaho Falls.

Idaho Innovation Campus · Idaho Falls, IDConstruction permit filedEscrow: Cadence Escrow Services
TRL 6 of 9, band 5.4 to 6.5, signed by Dr. Samuel Adeyemi, PhD Nuclear Engineering; ASME Section III reviewer, on Jun 9, 2026.See the evidence it rests on

$3,860,000 committed of $5,000,000

$1,930,000 released · 77% subscribed

Released to the issuerCommitted, held in escrowRemaining
Minimum
$100

$13 per unit

Instrument
Preferred equity
Term
None
Investors
1,412

Closes October 15, 2026 · 32 days remaining

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Issuer updates

  1. 720-hour prototype run concluded without degradation

    June 12, 2026

    The witnessed campaign concluded at 720 hours with no measurable degradation in heat pipe performance. The independent report has been filed with the platform and forms the basis of the TRL 6 assessment. We are now focused on the irradiation campaign, which is the long pole and which we do not control the schedule of.

    Priya Raghunathan, CEO