# Nabtesco

> Nabtesco is a VC fund in Tokyo backing Energy, Software and Manufacturing. See 4 investments, check sizes, portfolio. Updated Aug 2026.

- Type: VC Fund
- Location: Tokyo, Japan
- Total investments: 4
- Last investment: Jul 2021
- Lead investor: 0%
- Last updated: Aug 2026
- X (Twitter): https://twitter.com/Nabtesco_corp
- Website: https://www.nabtesco.com/
- Facebook: https://www.facebook.com/Nabtesco.corp

Nabtesco is a VC fund in Tokyo focused on Energy and Software. Nabtesco specializes in gearboxes, rotors, motors and robotics.

## Round sizes

| Stage | Round size |
| --- | --- |
| Series B | $5.9M–$15M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Energy | 2 | 50% |
| Software | 2 | 50% |
| Manufacturing | 2 | 50% |
| Battery | 1 | 25% |
| Shipping | 1 | 25% |

15 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series B | 2 | 50% |
| Series C | 1 | 25% |
| Funding Round | 1 | 25% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 2 | 50% |
| Greece | 1 | 25% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| DeepSea Technologies | DeepSea Technologies is a shipping software company specialising in optimising vessel performance for ship owners and operators of commercial vessels including container ships, bulk carriers, LNG carriers and tankers.The company works predominantly in the field of artificial intelligence, developing algorithms and platforms that allow vessels toconsume less fuel, generate fewer emissions, predict future maintenance requirements and travel optimal shipping routes. | $5.5M |  | Jul 29, 2021 |  |
| DeepSea Technologies | DeepSea Technologies is a shipping software company specialising in optimising vessel performance for ship owners and operators of commercial vessels including container ships, bulk carriers, LNG carriers and tankers.The company works predominantly in the field of artificial intelligence, developing algorithms and platforms that allow vessels toconsume less fuel, generate fewer emissions, predict future maintenance requirements and travel optimal shipping routes. | $5.9M | Series B | Jul 29, 2021 |  |
| Rhombus Energy Solutions | Rhombus Energy Solutions develops advanced, high-efficiency power conversion and energy management systems for energy storage, renewable energy, vehicle charging, microgrids and test equipment applications. Rhombus offers standalone products, power conversion modules, semi-custom configurations, as well as contracted product development servicesand high-power certification testing including UL1741 & IEEE1547. The Rhombus product line consists of power converters/inverters that range of 2kW to 1MW in size.Rhombus also offers VectorStat® cloud-based analytics and monitoring for power systems with remote, real-time management. Founded by some of the best engineers in the industry, Rhombus is led by a powerhouse team with a unique mix of industry experience and deep subject matter expertise.www.rhombusenergy.com |  | Series C | Sep 17, 2020 |  |
| Spear Power Systems | Spear Power Systems designs and manufactures safe, reliable lithium-ion battery storage systems for demanding applications including defense, marine propulsion, oil & gas, and mining. The company has a wide range of energy storage systems suited to meet any demand. Their family of TRIDENT maritime batteries offers multiple cell chemistries inorder to provide you with industry-leading energy density or ultra-high power density depending on the requirements of your application. | $14.6M | Series B | Sep 24, 2019 |  |

4 of 4 investments shown.

## Co-investors
- [Emerald Technology Ventures](https://shizune.co/investors/profile/emerald-technology-ventures) — VC Fund, 4 deals together
- [ETF Partners](https://shizune.co/investors/profile/etf-partners) — VC Fund, 2 deals together
- [Signal Ventures](https://shizune.co/investors/profile/signal-ventures-3f4a) — VC Fund, 2 deals together
- [Chevron Technology Ventures](https://shizune.co/investors/profile/chevron-technology-ventures) — VC Fund, 1 deal together
- [Cycle Capital](https://shizune.co/investors/profile/cycle-capital) — VC Fund, 1 deal together
- [Energy Innovation Capital](https://shizune.co/investors/profile/energy-innovation-capital) — VC Fund, 1 deal together

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## FAQ

### What does Nabtesco invest in?

Nabtesco invests primarily in Energy, Software and Manufacturing startups, most often at Series B and Series C stage. Most of the 4 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Nabtesco's check size?

Nabtesco typically joins rounds of $5.9M–$15M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Nabtesco participates in.

### When did Nabtesco last invest?

The most recent investment recorded for Nabtesco closed in Jul 2021. Shizune tracks 4 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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