Funded Sustainability Startups in United States
Disclosed funding amounts in this sustainability-focused U.S.
Disclosed funding amounts in this sustainability-focused U.S. list cluster tightly around the tens of millions, with one clear exception: Mill’s $100M round on 2023-01-17 dwarfs the next-largest disclosed amounts (Blue Whale Materials at $55M on 2024-09-20 and Battery Resourcers at $70M on 2021-09-21). Most other disclosed rounds sit below $55M, while the smallest disclosed amount is Drastic Plastics’ $100K on 2021-06-08.
The 20 most recent rows (2021-06-08 through 2025-06-23) show a time-and-stage concentration: many rounds fall in 2024 (with frequent “Series Unknown”), and several early-stage deals appear in 2023 (e.g., Proxxy $250K on 2023-05-26; r.Cup $4M on 2022-11-22). Geographic clustering also shows up in multiple states where cities are repeated by organization, such as California (AirCapture in Berkeley on 2025-06-05; Water Intelligence in Palm Springs on 2024-08-13; Mill in San Bruno on 2023-01-17). Of the 20 rows, 10 list “Series Unknown” and 2 are “undisclosed.”
Most recent rounds
20 shownRelated listings
Frequently asked
What stands out as the largest disclosed round here, and how does it compare to the rest of the disclosed amounts?
Mill’s $100M disclosed round on 2023-01-17 is the outlier. The next-largest disclosed amounts are Battery Resourcers at $70M (2021-09-21) and Blue Whale Materials at $55M (2024-09-20), with most other disclosed rounds landing well below $55M.
Which entries are the smallest disclosed rounds, and are they clustered around a particular stage?
The smallest disclosed amount is Drastic Plastics at $100K on 2021-06-08. The next-smallest disclosed rounds are The ReCollective at $10K on 2025-05-01 and Proxxy at $250K on 2023-05-26; these lower figures correspond to “Series Unknown” (The ReCollective) and early-stage labels like Pre-Seed (Proxxy).
Are there any notable date windows where multiple funded rounds appear close together?
Yes: 2024 shows heavy density across the list, including Blue Whale Materials ($55M, 2024-09-20), Water Intelligence ($21M, 2024-08-13), Everest Carbon ($3M, 2024-12-02), and Acceleron Fusion ($24M, 2024-12-03). In contrast, 2025 is led by AirCapture ($50M, 2025-06-05) and REEcycle (undisclosed, 2025-06-23) at the top of the date range.
Is there a dominant stage classification pattern across this list, or do stages appear evenly distributed?
Stage reporting is concentrated in “Series Unknown”: 10 of 20 rows list it. Among the remaining labeled rounds, there are multiple large “Series” labels in the tens of millions (e.g., Parallel Systems Series B at $38M on 2025-04-14; Acceleron Fusion Series A at $24M on 2024-12-03), but fewer clear repeat counts for any single specific stage name.
Do any geographies repeat often, suggesting a location cluster within the United States?
California appears repeatedly across different cities: AirCapture is in Berkeley (2025-06-05) and Water Intelligence is in Palm Springs (2024-08-13), while Mill is in San Bruno (2023-01-17). Beyond California, other states show single but distinct anchor points such as Battery Resourcers in Worcester, MA (2021-09-21) and Blue Whale Materials in Washington, DC (2024-09-20).
Which listed rounds should be treated as outliers for follow-up because of missing or non-standard amounts?
Two rows are “undisclosed” (REEcycle on 2025-06-23 and Wasteble on 2024-05-01), which prevents comparison to the disclosed amount distribution. Separately, the funding profile combines very small disclosed rounds like The ReCollective’s $10K (2025-05-01) with major disclosed rounds like Mill’s $100M (2023-01-17), so both magnitude extremes are candidates for deeper qualification of deal context.
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