Funded Sustainability Startups
Across the 50 most recent sustainability rounds shown, the largest disclosed raise is Haiki+ at $107M on 2026-04-23, dwarfing the rest of the disclosed amo…
Across the 50 most recent sustainability rounds shown, the largest disclosed raise is Haiki+ at $107M on 2026-04-23, dwarfing the rest of the disclosed amounts (the next-highest disclosed amounts include Blue Whale Materials at $55M on 2024-09-20 and AirCapture at $50M on 2025-06-05). Amount disclosure is also bifurcated: several rounds are comparatively small (e.g., BioLoop at $60K on 2026-03-04 and The ReCollective at $10K on 2025-05-01), but the list also includes mid-to-large disclosed checks clustered around the tens of millions (e.g., GPS Renewables $49M on 2024-04-16; UBQ Materials $70M on 2023-09-13). Geographically and temporally, the record spans 2023-05-03 (Bend, $3M) through 2026-06-22 (Droppie, $5M) with a dense run in 2024-12 to 2025-07 and a multi-market spread rather than a single city dominance (examples include Berlin’s Cardino $4M on 2024-06-11; Toronto’s AirCapture $50M on 2025-06-05 is actually Berkeley, but Toronto appears with CERT Systems undisclosed on 2025-08-11 and Kiwi Charge $880K on 2026-02-09). Stage/stated labeling is heavily opaque: 25 of 50 rows show “Series Unknown,” and 9 show “undisclosed” amounts, shaping how much can be inferred from disclosed size alone.
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Frequently asked
What stands out about the size distribution—how does the top disclosed round compare to the rest?
Haiki+’s $107M disclosed round on 2026-04-23 is the clear outlier; no other disclosed amount in the list exceeds $70M (UBQ Materials at $70M on 2023-09-13) and the next-largest disclosed amounts cluster in the $50M range (Blue Whale Materials at $55M on 2024-09-20; AirCapture at $50M on 2025-06-05).
Are there notable concentration windows by date among these sustainability rounds?
Yes: there is a visibly dense cluster from 2024-12-02 to 2025-07-03, including multiple disclosed sizes in the tens of millions such as Acceleron Fusion $24M (2024-12-03), AirCapture $50M (2025-06-05), and GPS Renewables $49M (2024-04-16 falls earlier but is still part of the 2024-12/2025 run shown overall). The table also runs continuously between the oldest dated entry (2023-05-03) and the newest (2026-06-22).
Which stages are most common, and how does that affect cross-company comparison?
“Series Unknown” dominates the labeling: 25 of 50 rows are marked “Series Unknown,” and “undisclosed” amounts appear in 9 rows. That means the dataset often supports comparisons by date and location, while stage-driven conclusions are limited (e.g., multiple large disclosed rounds still sit inside “Series Unknown,” such as Haiki+ $107M on 2026-04-23).
Do specific cities or countries repeat often enough to suggest a geographic hub?
The list shows broad geographic spread more than hubbing: there are examples across Europe (Haiki+ in Milan on 2026-04-23; Cardino in Berlin on 2024-06-11), North America (Blue Whale Materials in Washington, D.C. on 2024-09-20; AirCapture in Berkeley on 2025-06-05), and Asia (GPS Renewables in Bangalore on 2024-04-16; Noovoleum in Singapore on 2025-02-11). The repeats are not strong enough, from these 50 entries alone, to point to one dominating city.
Which entries are the smallest disclosed rounds, and are they isolated or part of a broader low-end pattern?
The smallest disclosed amount is The ReCollective at $10K on 2025-05-01, followed by BioLoop at $60K on 2026-03-04; these are far below the dominant tens-of-millions band that includes entries like UBQ Materials $70M (2023-09-13) and M.M. Plastics $38M (2026-04-09). This suggests a low-end tail rather than uniform scaling across rounds.
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