· Venture Capital Tracker · investment-strategies · 1 min read
Cantos Closes $70M Fund IV for Deep Tech and Defense
Cantos closed an oversubscribed $70M Fund IV to lead pre-seed and seed rounds across aerospace, defense, nuclear, biotech, and compute.
Cantos closed an oversubscribed $70M Fund IV, founder and GP Ian Rountree confirmed, to keep leading early deep-tech rounds across aerospace, defense, nuclear, biotech, advanced manufacturing, and compute.
Key facts
- Firm: Cantos (founded 2016, San Francisco)
- Fund IV: $70M (oversubscribed; Fund III was $50M)
- Strategy: Lead pre-seed/seed with $1.5-4M checks; ~22 companies
- Notable bets: Neros (led pre-seed), Castelion, Astranis, Venus Aerospace
Why this matters
Cantos deliberately kept Fund IV small to maintain high ownership and alignment. The firm has invested in hard tech “since before it was cool,” with a defense-and-frontier portfolio now drawing broad interest.
Sources
- Cantos $70M Fund IV (Tectonic Defense): https://www.tectonicdefense.com/first-look-cantos-raises-70m-fund-iv/
- Cantos Fund IV close (Cryptorank, July 6, 2026): https://cryptorank.io/news/feed/cantos-raises-70-m-fund-iv
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