---
title: "Cantos Backs Heaviside Industries $28M Series A in Defense Tech"
description: "Cantos backed Heaviside Industries’ $28M Series A (May 2026). That round is historical: the live mark is $600M after a $60M Series B on August 12, 2026."
date: 2026-05-11T00:00:00.000Z
tags: ["cantos", "series-a", "deep-tech", "defense-tech", "startup-funding", "2026-vc-news"]
source: https://venturecapitaltracker.com/2026-cantos-heaviside-industries-28m-series-a
---

# Cantos Backs Heaviside Industries $28M Series A in Defense Tech

> Cantos backed Heaviside Industries’ $28M Series A (May 2026). That round is historical: the live mark is $600M after a $60M Series B on August 12, 2026.

**Superseded for the live mark.** This page is the **May 2026 $28 million Series A** recap. On **August 12, 2026** Heaviside raised **$60 million Series B at $600 million**. Current diligence memo: [Heaviside $600M after $60M Series B](/2026-heaviside-60m-series-b-600m-nammo).

**Cantos** backed **Heaviside Industries' $28M Series A** in May 2026, funding a defense manufacturing and energetics company — extending the firm's deep-tech and defense track record. The Series B PR does **not** restate who led Series A; Tech Funding News later attributed that lead to Interlagos. Treat Cantos here as a **named backer**, not a confirmed A lead.

## Key facts

- **Investor:** Cantos
- **Company:** Heaviside Industries (defense manufacturing / energetics)
- **Round:** $28M Series A
- **Date:** May 2026
- **Co-investors:** Menlo Ventures, Anorak Ventures, Flume Ventures, and others
- **Related defense bets:** Neros (pre-seed lead), Castelion (Series A)

## Why this matters

Heaviside is a marquee entry for Cantos' fresh $70M Fund IV, reinforcing its conviction in American hard-tech and defense manufacturing.

## Sources

1. Cantos / Heaviside Industries Series A (CB Insights): https://www.cbinsights.com/investor/cantos-ventures
2. Cantos Fund IV & defense portfolio (Tectonic Defense): https://www.tectonicdefense.com/first-look-cantos-raises-70m-fund-iv/