What does Third Sphere invest in?
Third Sphere invests most often at Venture and Series A (65% of the rounds on record), in sectors such as Sustainable, Public Policy and Tech For Good.

United States · Investor
Last cheque observed Aug 2026; 80 cheques on record.
Deploying nowNew fund $9.9M, May 2022VC firm
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6 cheques in the last 12 months
Mostly Venture and Series A: 65% of its rounds
Sole investor in 7 rounds, median $1.0M
We use early stage capital to upgrade systems.From their own website
Every round we can evidence, newest first80 appearances
6 rounds
14 rounds
17 rounds
14 rounds
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
Named by the firm itself, on a filing, its Form ADV or its company registration5 named
We also hold 7 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
From their own portfolio page (on their website)
One Concern +MoreApplied Carbon +MoreClimatebase +MoreDorothy +MoreFurno Materials +MoreMerino Energy +MoreMill +MoreSingularity Energy +MoreT-Sync
Weaker than a round we watched, stronger than a list somebody sold us. A firm is far less willing to put a company on its own site that it never funded.
The investors most often in the same rounds as Third Sphere. A count of rooms they were both in, not a relationship either has claimed.
The latest companies Third Sphere put money into.
Third Sphere invests most often at Venture and Series A (65% of the rounds on record), in sectors such as Sustainable, Public Policy and Tech For Good.
80 investments on record, 6 of them in the last 12 months. The most recent was in Aug 2026.
Its most recent investments on record: Sonic Fire Tech (Seed, Aug 2026), ChargeLab (Grant, Jul 2026) and Wasted* (Venture, Apr 2026).
The median round it joins is $5.0M. It says it writes cheques of $250K to $1.0M.
Rarely, if at all: none of its 80 investments on record names it as the lead.
Most of the companies it backs are in the United States (74%), the United Kingdom (8%) and Canada (5%).
Yes: it is actively investing, with 6 investments in the last 12 months.
Most often Techstars (7 rounds together), Elemental Impact (5 rounds together) and National Science Foundation (5 rounds together).
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Built from the rounds we watched, its filings and its own website, refreshed every night. How we count · Report a correction · Is this your firm? Claim it