What does Cleantech Open invest in?
Cleantech Open invests most often at Venture and Grant (60% of the rounds on record), in sectors such as Battery, Sdg and Recycling.
United States · Investor
Last cheque observed Sep 2026; 165 cheques on record.
Deploying nowAcceleratorWebsite unconfirmed
17 cheques in the last 12 months
Mostly Venture and Grant: 60% of its rounds
Sole investor in 30 rounds, median $794K
A website was listed for this organisation, but we could not confirm it belongs to the firm that wrote these cheques. Either the site never mentions them, or it turned out to be a different company sharing the name. We show neither it nor anything read from it. Tell us the right one.
Every round we can evidence, newest first165 appearances
14 rounds
25 rounds
40 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.
We hold 2 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.
The investors most often in the same rounds as Cleantech Open. A count of rooms they were both in, not a relationship either has claimed.
The latest companies Cleantech Open put money into.
Episodes that name Cleantech Open in their description, not their title.

Ep 44: Emily Reichert, CEO of Greentown Labs
MentionsCleantech OpenFlagship Ventures
Cleantech Open invests most often at Venture and Grant (60% of the rounds on record), in sectors such as Battery, Sdg and Recycling.
165 investments on record, 17 of them in the last 12 months. The most recent was in Sept 2026.
Its most recent investments on record: Moon Five Technologies (Debt, Sept 2026), Arculus Solutions (Seed, Jul 2026) and Switch (Venture, Jun 2026).
The median round it joins is $1.1M.
Rarely, if at all: none of its 165 investments on record names it as the lead.
Most of the companies it backs are in the United States (87%) and Italy (5%).
Yes: it is actively investing, with 17 investments in the last 12 months.
Most often National Science Foundation (36 rounds together), US Department of Energy (18 rounds together) and MassChallenge (13 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