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Reg D 506(c)TRL76.6–7.5Tier IIOpen

Castellan Defense Systems

Castellan Defense Systems

Senior notes on a transportable gas-cooled microreactor under a defense prototyping contract. Accredited only.

Roughly half of the casualties in recent land campaigns occurred in or around fuel convoys. A three megawatt reactor that fits in shipping containers and runs for five years without refueling removes that convoy. Castellan holds a construction permit under Department of Energy authorization and a prototyping contract with options for eight units.

New River Defense Complex · Radford, VAConstruction permit issuedEscrow: Meridian Trust, N.A.
TRL 7 of 9, band 6.6 to 7.5, signed by Dr. Helena Vargas-Mbeki, PE, Nuclear; former NRC senior reactor analyst, on Jun 4, 2026.See the evidence it rests on

$24,900,000 committed of $30,000,000

$17,430,000 released · 83% subscribed

Released to the issuerCommitted, held in escrowRemaining
Minimum
$25,000

$1,000 per unit

Target coupon
7.15%

Annual, fixed

Term
6 yr
Investors
88

Closes November 15, 2026 · 63 days remaining

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Instrument and terms

Instrument
Senior note
Risk tier
Tier II · Operating Assets
Target coupon
7.15%
Expected term
6 yr
Price per unit
$1,000
Minimum investment
$25,000
Target raise
$30,000,000
Opens
February 2, 2026
Closes
November 15, 2026
Escrow agent
Meridian Trust, N.A.

Regulatory rail

Exemption
Regulation D, Rule 506(c)
Offering ceiling
Unlimited
Who can buy
Verified accredited investors only
Resale
Restricted
Resale restriction
12 months
Residency
No restriction
Accreditation
Verified accredited only

Secondary tradingComing soon

Freely tradable does not mean there is a market. An alternative trading system for platform securities is planned and is not operational.