Third Sphere (formerly Spero Ventures) — seed+ & Pre-Seed VC Firm ($2.0M–$10.0M Checks)
Third Sphere (formerly Spero Ventures) is a seed+, Pre-Seed venture capital firm based in San Francisco, CA investing in Other, Deep Tech. The firm typically writes $2.0M–$10.0M checks and has 94 portfolio companies in our records.
- Check size
- $2.0M–$10.0M
- Portfolio
- 94 companies on record
- Partners
- 8 listed
- Stage
- seed+, Pre-Seed
- Sectors
- Other, Deep Tech
- HQ
- San Francisco, CA
- AUM
- Not in our records
Last verified: 2026-05-27
seed+, Pre-Seed
$2.0M – $10.0M
94+ companies
8 partners
Investment Thesis
Invests in companies creating a sustainable, equitable future through advancements in ClimateTech, IoT, and societal infrastructure.
How Third Sphere (formerly Spero Ventures) invests
Third Sphere (formerly Spero Ventures) is a vc firm based in San Francisco, CA. The firm invests at the seed+, Pre-Seed stages, with a focus on Other, Deep Tech. It does not invest in Consumer.
Third Sphere (formerly Spero Ventures) typically writes checks of $2.0M–$10.0M per investment.
Third Sphere (formerly Spero Ventures) has backed 94 companies in our records, including BlocPower, Aurora Solar, Rachio.
Partners & Team
Industry Focus
Invests In
Does Not Invest In
Portfolio Companies (94)
Other
BlocPower
Aurora Solar
Rachio
3AM Innovation
Adiona
Applied Carbon
Architizer
Avvir
Blokable
Blueprint
- •Raising at seed+, Pre-Seed? You're squarely in their sweet spot.
- •Lead with your fit in Other, Deep Tech — the sectors they actively back.
- •Size your ask to their typical $2.0M – $10.0M check.
- •warm intro preferred
- •Address your outreach to a specific partner, such as Yana Klimova, Chief Financial Officer.
- •A warm introduction beats a cold email. Get matched and request an intro.
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Fundraising resources
Frequently Asked Questions
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