# Mitsui Mining & Smelting

> Mitsui Mining & Smelting is a VC fund in Tokyo backing Medical, Water and AgTech. See 5 investments, check sizes, portfolio. Updated Aug 2026.

- Type: VC Fund
- Location: Tokyo, Japan
- Total investments: 5
- Last investment: Jul 2025
- Lead investor: 0%
- Last updated: Aug 2026
- Website: https://www.mitsui-kinzoku.co.jp/en/

Mitsui Mining & Smelting is a VC fund in Tokyo focused on Medical and Water. Mitsui Mining & Smelting Company, Ltd. mainly produces non-ferrous metal such as lead and copper alloys.

## Round sizes

| Stage | Round size |
| --- | --- |
| Series A | $8M–$50M |
| Venture - Series Unknown | $22M–$29M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Medical | 2 | 40% |
| Water | 1 | 20% |
| AgTech | 1 | 20% |
| Energy | 1 | 20% |
| CleanTech | 1 | 20% |

13 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 2 | 40% |
| Series B | 1 | 20% |
| Venture - Series Unknown | 1 | 20% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Japan | 3 | 60% |
| United States | 1 | 20% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| WaHa | WaHa has developed an innovative solid desiccant regeneration engine called the WaHa Vaporator®, which aims to revolutionize air conditioning technology. This patented system offers significant improvements in energy efficiency and greenhouse gas emissions for cooling, dehumidification, and atmospheric water generation applications.Key featuresof the WaHa Vaporator® include:- A novel approach to regenerating solid desiccants for air dehumidification - Independent control of dew point and dry bulb temperatures - Pure water generation, enabling direct evaporative cooling - Compatibility with ultra-low global warming potential refrigerants - Up to 90% reduction in energy consumption compared to conventional systems - Comparable size and weight to existing AC solutions and can be installed by current trades peopleThe WaHa Vaporator® is designed to be a versatile solution for air conditioning in any climate zones. It can also be used for cost-effective and energy efficient atmospheric water harvesting in any climate zone – including arid and cold climates. When compared to alternative technologies, it offers superior reliability and the lowest cost of ownership.WaHa was founded in 2018 to commercialize novel desiccant materials and technologies developed at UC Berkeley over two decades. The company has received seed funding from several sources, including UC Berkeley, Berkeley Catalyst Fund, Mitsui-Kinzoku, TAQNIA, and strategic angel investors. | $8M | Series A | Jul 10, 2025 |  |
| Chitose Group | CHITOSE GROUP is a family of biotechnology companies operating mainly in Southeast Asia and Japan with an aim of leaving mankind with an environment where they can live in abundance for over a thousand years. CHITOSE GROUP is creating new values in the fields of agriculture, medical, food, energy, chemistry and others through “Technologicaldevelopment capabilities in the biotechnology field by constantly promoting economic rationality” and “Business development capabilities for drawing a path towards commercialization by understanding the essence and limitations of biotechnology”. | $28.6M | Venture - Series Unknown | Mar 10, 2025 |  |
| Alpha Fusion | Alpha Fusion produces astatine based radiopharmaceuticals for targeted alpha therapy. | $6.9M | Series B | Oct 08, 2024 |  |
| Chitose Group | CHITOSE GROUP is a family of biotechnology companies operating mainly in Southeast Asia and Japan with an aim of leaving mankind with an environment where they can live in abundance for over a thousand years. CHITOSE GROUP is creating new values in the fields of agriculture, medical, food, energy, chemistry and others through “Technologicaldevelopment capabilities in the biotechnology field by constantly promoting economic rationality” and “Business development capabilities for drawing a path towards commercialization by understanding the essence and limitations of biotechnology”. | $22.5M | Venture - Series Unknown | Jul 13, 2023 |  |
| Atomis | Atomis provides global solutions for precisely controlling gases. Its core technology, porous coordination polymers (PCPs; also known as metal-organic frameworks (MOFs)), is based on research developed by Distinguished Professor Susumu Kitagawa at the Institute for Advanced Study at Kyoto University. It aims not only to provide solutions such asthe optimization for manufacturing processes of PCPs but to also develop applications that provide innovative value using these materials.It was founded by Masakazu Higuchi in 2015 and is headquartered in Kyoto, Japan. | $3.2M | Series A | Jul 01, 2019 |  |

5 of 5 investments shown.

## Co-investors
- [Amano Enzyme](https://shizune.co/investors/profile/amano-enzyme) — VC Fund, 2 deals together
- [Ikeda Saccharification Industry](https://shizune.co/investors/profile/ikeda-saccharification-industry) — VC Fund, 2 deals together
- [Mers Line](https://shizune.co/investors/profile/mers-line) — VC Fund, 2 deals together
- [Mitsubishi Kakoki Kaisha](https://shizune.co/investors/profile/mitsubishi-kakoki-kaisha) — VC Fund, 2 deals together
- [NGK Insulators](https://shizune.co/investors/profile/ngk-insulators) — VC Fund, 2 deals together
- [SBI Investment](https://shizune.co/investors/profile/sbi-investment-2) — VC Fund, 2 deals together

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## FAQ

### What does Mitsui Mining & Smelting invest in?

Mitsui Mining & Smelting invests primarily in Medical, Water and AgTech startups, most often at Series A and Series B stage. Most of the 5 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Mitsui Mining & Smelting's check size?

Mitsui Mining & Smelting typically joins rounds of $8M–$50M at Series A and $22M–$29M at Venture - Series Unknown. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Mitsui Mining & Smelting participates in.

### When did Mitsui Mining & Smelting last invest?

The most recent investment recorded for Mitsui Mining & Smelting closed in Jul 2025. Shizune tracks 5 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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