Strategic Corporate · WATER INVESTOR

Mitsui

Mitsui is a water-focused strategic corporate that has backed 2 water companies since 1876. (don't) Waste Water rates its water commitment Committed.

Committed

Water Commitment

Type

Strategic Corporate

AUM

$11.0B

Founded

1876

Stage

Series B

Median round

$38.5M

Portfolio

2 cos

Water Commitment Score

Tier

Committed

2 water companies · last deal 2025 · leads ~0% of rounds · Med confidence

How this is scored ↗
as of Jun 2026 · no pay-to-rank

Compiled from official filings, third-party records, and direct intelligence from investors and founders, in Leviathan · recomputed monthly · as of Jun 2026.

How they invest

Series B1

Median round$38.5Mrange $25.5M - $51.5M · 2 disclosed

Portfolio · 2 water companies

Summit Nanotech

Summit Nanotech has developed Denali, a direct-lithium-extraction platform that passes brines t

$25.5M2025

WOTA

Tokyo-based WOTA builds AI-controlled modular systems such as WOTA BOX and WOSH that filter and

$51.5MSeries B · 2023

See the full portfolio in Leviathan →

Invests alongside

ShinMaywa Industries1x Yusaku Maezawa1xMetawater1x Maezawa Industries1xTakasago Thermal Engineering1xSwing Corporation1xSekisui Chemical1xJapan Green Investment Corp1xKOBASHI Holdings1x

Highlighted = profiled on (don't) Waste Water.