Series Unknown Funded Sustainability Startups
Disclosed funding in these “Series Unknown” sustainability rounds is highly concentrated at the top: the largest disclosed amount is $100M for Mill on 2023…
Disclosed funding in these “Series Unknown” sustainability rounds is highly concentrated at the top: the largest disclosed amount is $100M for Mill on 2023-01-17, and that level sits far above the rest of the disclosed rounds (the next-largest disclosed entries are $70M for UBQ Materials on 2023-09-13 and $55M for Blue Whale Materials on 2024-09-20). There’s also a clear temporal edge and clustering: the most recent row is CERT Systems on 2025-08-11, while the 22 displayed rounds span 2022-11-22 (r.Cup) through 2025-08-11, with multiple entries landing in the mid-2024 window (e.g., Blue Whale Materials on 2024-09-20; Water Intelligence on 2024-08-13; UBQ Materials is 2023-09-13; GPS Renewables is 2024-04-16).
The dataset also shows a documentation pattern that complicates comparisons: 9 of 22 rows show “undisclosed” amounts, while the remaining 13 provide disclosed figures (from $10K at The ReCollective on 2025-05-01 up to the $100M Mill outlier). Geography appears widely distributed rather than hub-and-spoke within a single city: the list includes multiple countries and major metros (e.g., Washington, DC with Blue Whale Materials at $55M on 2024-09-20 and Berlin with Torev Motors at $80K on 2023-05-29), without repeating the same city name across rows.
Most recent rounds
22 shownRelated listings
Frequently asked
What are the biggest and smallest disclosed rounds here, and how far do they separate in magnitude?
The largest disclosed round is $100M for Mill on 2023-01-17, while the smallest disclosed amount is $10K for The ReCollective on 2025-05-01. The $100M figure is a clear outlier relative to the rest of the disclosed amounts, which top out at $70M (UBQ Materials, 2023-09-13) and $55M (Blue Whale Materials, 2024-09-20).
Do these “Series Unknown” sustainability rounds cluster around a particular time window?
Yes, there’s noticeable mid-to-late 2024 density: GPS Renewables closed 2024-04-16 at $49M, UBQ Materials appears at 2023-09-13 ($70M), and in 2024 alone there are multiple disclosed rows including Blue Whale Materials (2024-09-20, $55M), Water Intelligence (2024-08-13, $21M), and Everest Carbon (2024-12-02, $3M). The overall span runs from 2022-11-22 (r.Cup) through 2025-08-11 (CERT Systems).
How often are amounts undisclosed, and does that limit funding-size comparisons?
9 of 22 rows are labeled “undisclosed,” including CERT Systems (2025-08-11) and REEcycle (2025-06-23). That means only 13 entries have disclosed amounts to compare—so concentration at the top (e.g., Mill’s $100M on 2023-01-17) is evident, but comparisons are incomplete when rounds are undisclosed.
Are any cities or geographies over-represented across these 22 rows?
The list looks geographically dispersed rather than concentrated in a single repeated hub: examples include Washington, DC (Blue Whale Materials, $55M on 2024-09-20), Berlin (Torev Motors, $80K on 2023-05-29), and Houston (REEcycle, undisclosed on 2025-06-23). No single city name repeats with multiple rows in the displayed set.
Which entries are recent enough to be actionable for near-term outreach tracking?
Within the most recent ~90 days of dates shown, the visible entries include CERT Systems (2025-08-11, undisclosed), RecycleSmart (2025-07-03, $890K), and REEcycle (2025-06-23, undisclosed), plus Blueit (2025-05-22, undisclosed). This cluster sits at the top of the date-sorted list, with multiple mid-2025 rounds before the dataset moves back into 2024.
Know which startups just got funded. Every week.
Fresh funding rounds, new companies, and the sectors moving fastest — in your inbox every Monday morning.
Free. Sent every Monday. Unsubscribe anytime.