
ArcTern Ventures is a Toronto-based venture capital firm investing in breakthrough technology companies solving climate change and sustainability challenges. Formerly known as the MaRS Cleantech Fund, the firm invests globally in decarbonization across renewable energy, clean mobility, circular economy, and sustainable food and agriculture.
Deal activity decreased year-over-year (2 deals in the last 12 months vs 5 prior). Average disclosed round size is $31.9M (across 34 rounds with reported amounts).
Portfolio
32
Fund Size
$335M
Top Stage
Series B
Last 12 Mo
2
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
36 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| Series C | $50M | Mar 2026 | |
| Series C | $160M | Nov 2025 | |
| Series B | $146M | Jun 2025 | |
| Seed | $12.5M | Feb 2025 | |
| Series B | $100M | Jan 2025 | |
| Series A | $10M | Oct 2024 | |
| Series B | $75M | Sep 2024 | |
| Series B | $33M | Jul 2023 | |
| Series B | $42M | Jan 2023 | |
| Series A | — | Sep 2022 | |
| Series A | $12.3M | Feb 2022 | |
| Series B | $60M | Nov 2021 | |
| Series B | $22M | Jul 2021 | |
| Seed | $3.2M | May 2021 | |
| Series B | $40M | Feb 2021 | |
| Series A | $11.6M | Oct 2020 | |
| PPalmetto Clean Technology, Inc. | Series B | $29M | Aug 2020 |
| Series A | $10.1M | Feb 2020 | |
| Unknown | $5.5M | Jun 2016 | |
| GGreenMantra Technologies | Unknown | $5.5M | Jun 2016 |
| Series B | $7M | Jan 2016 | |
| Series A | $3M | Jan 2013 | |
| Unknown | $17.5M | — | |
| Series B | $19M | — | |
| Series A | $30M | — |
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Top Co-Investors
Energy Impact Partners4 shared
Ecosystem Integrity Fund4 shared
Maniv3 shared
Capricorn Investment Group3 shared
Volta Energy Technologies3 shared
Impact Science Ventures3 shared
Helios Climate Ventures3 shared
Chrysalix Venture Capital3 shared
Good Growth Capital3 shared
IA Capital Group3 shared
Core Innovation Capital2 shared
Polyvalent Capital2 shared
Menlo Ventures2 shared
MVP Ventures2 shared
Khosla Ventures2 shared
MicroVentures2 shared
THOR Industries2 shared
Ridgeline Partners2 shared
Schematic Ventures2 shared
Last updated: 8 September 2026