Cantos | Activity | F4

Cantos Activity

Every public signal F4 has attached to this firm, with sources and cross-entity links.

Types

Time range

Essay

Published a thesis essay on why nuclear microreactors represent the future of portable energy infrastructure and power distribution.

The Future is Radiant: Why we invested in Radiant Nuclear

Cantos

medium.com

Added recently

Milestone

Portfolio company Radiant Nuclear achieved unicorn status and raised $300M+ in Series D funding for portable nuclear microreactor production.

Radiant Nuclear

Radiant Nuclear Cantos

radiantnuclear.comDEC 2025

DEC 2025

Investment

Participated in Castelion's $350M Series B to accelerate mass production of U.S. hypersonic weapons systems.

Castelion

Castelion Cantos

castelion.comDEC 2025

DEC 2025

Investment

Co-led $8M seed round for MoldCo's virtual clinic for mold toxicity testing and treatment.

MoldCo

MoldCo Cantos

citybiz.coSEP 2025

medium.com

SEP 2025

Essay

Ian Rountree reflects on Cantos' portfolio performance, finding that the depth of technology has little correlation with success. Argues that having some 3D technology as a fulcrum matters, but application relative to the industry/problem is what drives outcomes.

"It's not the depth of your tech, it's how you use it" by Ian Rountree

Cantos

medium.comAUG 28, 2025

AUG 28, 2025

Investment

Co-led Pilgrim's $4.3M seed round to develop advanced military biotech solutions including hemostatic dressing Kingsfoil.

Pilgrim

Pilgrim Cantos

axios.comAUG 2025

AUG 2025

Investment

Led Vital Lyfe's pre-seed round. Vital Lyfe is building decentralized, mobile reverse osmosis desalination systems for global water scarcity, founded by former SpaceX engineers Jonathan Criss and Andrew Harner.

Vital Lyfe

Vital Lyfe Cantos

medium.comJUN 30, 2025

JUN 30, 2025

Podcast

Cantos GP Ian Rountree interviews Soren Monroe-Anderson, co-founder and CEO of Neros Technologies, about FPV drone technology and rebuilding domestic supply chains for unmanned defense systems.

Near Frontier podcast: Drones, Defense, and the New Industrial Frontier w/ Soren Monroe-Anderson of Neros

Cantos

cantosventures.substack.comAPR 14, 2025

APR 14, 2025

Exit

Portfolio company Atomos Space acquired by Katalyst Space Technologies to accelerate in-space servicing capabilities.

Atomos Space

Atomos Space Cantos

katalystspace.comAPR 2025

APR 2025

Exit

Portfolio company Atomos Space exited.

Atomos Space

Atomos Space Cantos

cbinsights.comMAR 2025

MAR 2025

New Fund

Closed Fund IV with support from Bleu Capital and other LPs to back science-driven companies solving climate and physical world challenges.

Fund IV

Cantos

bleucap.comMAR 2025

MAR 2025

Essay

Ian Rountree argues against the "deep tech" label, positioning Cantos as true generalists practicing old-school venture capital. Notes that the biggest economic opportunities are in the physical world and mentions an unannounced investment in the physical AI/robotics space.

"Don't call it 'deep tech'" by Ian Rountree

Cantos

medium.comFEB 13, 2025

FEB 13, 2025