# Antares Nuclear

> Develops factory-built nuclear microreactors for reliable power at military, space and remote industrial sites.

## Why it is interesting

Antares reached zero-power criticality in June 2026 and disclosed $470M in July Series C financing, including $370M equity and $100M debt. Its Mark-1 electricity test and military deployments remain planned rather than completed.

## Profile

- **Latest funding:** Series A — $30M (October 30, 2024)
- **Latest known valuation:** Not publicly disclosed
- **Total disclosed equity funding:** $38M
- **Stage:** growth
- **Status:** private
- **Industries:** climate-tech, deep-tech, defense-tech, hardware-semiconductors
- **Coverage:** full
- **Last updated:** 2026-10-29

## Key facts

- June 4, 2026: DOE-authorized Mark-0 zero-power criticality test at Idaho National Laboratory; no electricity generated by the Mark-0 test reactor.
- July 27, 2026: $470M Series C package, comprised of $370M equity and $100M debt, co-led by Paradigm and Caffeinated Capital.
- December 2, 2025: $96M Series B, comprised of $71M new equity and $25M debt according to contemporary coverage.
- Mark-1 electricity-producing demonstration targeted for 2027; military deployments targeted from 2028, not yet achieved.
- September 2026: announced multi-year HALEU supply agreements with Centrus and additional fuel-supply partnerships.

## Funding history

- Series C (equity and debt package) · $470M total ($370M equity; $100M debt) · July 27, 2026
  Source: https://antaresindustries.com/updates/antares-raises-seriesc
- Series B (equity and debt package) · $96M total ($71M equity; $25M debt) · December 2, 2025
  Source: https://antaresindustries.com/updates/a-letter-from-our-ceo-antares-96m-series-b
- Series A · $30M · October 30, 2024
  Source: https://antaresindustries.com/updates
- Seed · $8M · October 31, 2023
  Source: https://antaresindustries.com/updates

## Investors in our directory

- https://venturecapitaltracker.com/fund/paradigm

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)
**Last updated:** October 29, 2026

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.

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Source: https://venturecapitaltracker.com/startup/antares-nuclear