Funded Sustainability Startups in United States
In this 20-company snapshot of US sustainability rounds (most recent entry dated 2026-04-06), disclosed deal sizes cluster heavily in the tens of millions,…
In this 20-company snapshot of US sustainability rounds (most recent entry dated 2026-04-06), disclosed deal sizes cluster heavily in the tens of millions, but one disclosed round stands out: AirCapture’s $50M (2025-06-05) is the only disclosed amount at $50M or above, while the next-largest disclosed figure is Blue Whale Materials’ $55M (2024-09-20). Several other deals land in a similar middle band (e.g., Parallel Systems $38M on 2025-04-14; Endera $36M on 2025-02-11; Water Intelligence $21M on 2024-08-13), whereas the smallest disclosed amount is The ReCollective’s $10K (2025-05-01).
The entries also form temporal and geography clusters: nine of the 20 rounds occur between 2024-09-20 and 2025-06-05, and California appears repeatedly across multiple cities (Berkeley for AirCapture on 2025-06-05; Los Angeles for Parallel Systems on 2025-04-14; San Diego for Endera on 2025-02-11; San Francisco for Everest Carbon on 2024-12-02; San Bruno for Mill on 2023-01-17). Stage disclosure is uneven: 11 of 20 rows are labeled “Series Unknown,” and two rows show “undisclosed” amounts (REEcycle on 2025-06-23; Wasteble on 2024-05-01), which can obscure true size comparisons near the top of the list.
Most recent rounds
20 shownRelated listings
Frequently asked
Which disclosed round is the largest in this list, and how far ahead is it of the next-largest disclosed amount?
Blue Whale Materials’ $55M (2024-09-20) is the largest disclosed amount shown. AirCapture’s $50M (2025-06-05) is next-largest, so the top two disclosed rounds are tightly grouped compared with other disclosed deals like Parallel Systems’ $38M (2025-04-14).
Do the most recent deals concentrate into a narrow window, or are they spread out evenly?
They concentrate: nine of the 20 rounds fall between 2024-09-20 (Blue Whale Materials) and 2025-06-05 (AirCapture). The list also spans from 2021-06-08 (Drastic Plastics) through 2026-04-06 (wasted*), indicating a long tail but with heavier activity in the 2024-09 to 2025-06 period.
Are any states or cities over-represented in sustainability funding here?
California shows up repeatedly across multiple cities—AirCapture (Berkeley) on 2025-06-05, Parallel Systems (Los Angeles) on 2025-04-14, Endera (San Diego) on 2025-02-11, Everest Carbon (San Francisco) on 2024-12-02, and Mill (San Bruno) on 2023-01-17—more than any single non-CA state in the displayed rows.
How does the stage mix look, given that some rounds don’t specify a series or disclose an amount?
“Series Unknown” dominates at 11 of 20 rows, including large disclosed deals like Blue Whale Materials’ $55M (2024-09-20) and others such as Everest Carbon’s $3M (2024-12-02). Two rows have “undisclosed” amounts (REEcycle on 2025-06-23; Wasteble on 2024-05-01), which limits size-based comparisons even when the round date is recent.
Which entries are the clearest outliers by disclosed size?
At the small end, The ReCollective’s $10K (2025-05-01) is the smallest disclosed amount shown, far below the $100K floor examples like Drastic Plastics’ $100K (2021-06-08). At the large end, Blue Whale Materials’ $55M (2024-09-20) sits well above the next set of disclosed deals such as Water Intelligence’s $21M (2024-08-13) and Acceleron Fusion’s $24M (2024-12-03).
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