Region Sud Investissement
Région Sud Investissement (RSI) is the public co-investment fund of France's Provence-Alpes-Côte d'Azur region, founded in 2010 and based in Marseille. RSI backs regional companies from seed to growth capital, and its water bets span flood-risk data, pipe-inspection robotics and water-quality sensing. As of 2026 RSI has backed 3 water companies across 4 deals, rated Anchor by (don't) Waste Water.
Compiled by Antoine Walter, (don't) Waste Water, from official filings and direct intelligence in Leviathan.
The take
Région Sud Investissement is not a fund that went looking for water. RSI is the investment arm of one French region, Provence-Alpes-Côte d'Azur, the sun-and-drought belt that runs from Marseille to Nice, and its single shareholder is the regional government itself. Set up in 2010, it puts public equity into local companies that banks find too small and venture funds find too early. Its current vehicle, RSI 3, is 53.3 million euros, 60% from the EU's regional development fund and 40% from the region, deploying through 2029.
Région Sud Investissement never writes a cheque alone. RSI co-invests, meaning it only comes in alongside a private fund that puts in at least as much, so its job is to de-risk a round enough that private money follows, not to lead it. That is the deliberate design: patient public capital that lets a first-time founder close a seed round the market would otherwise leave on the table, which is why on (don't) Waste Water's data RSI leads almost none of the rounds it joins.
Région Sud Investissement's water bets read like a map of what a Mediterranean region worries about. RSI has backed three water companies, and all three are deeptech instruments for measuring and protecting water: Hydroclimat fuses weather radar, satellite and ground sensors into flood-risk forecasting; ACWA Robotics builds autonomous robots that crawl live, pressurised pipes to find leaks without digging up the street; and BiOceanOr puts AI behind real-time water-quality sensors. Drought data, leaking networks, water quality, the three places water actually breaks on a warming coast.
Région Sud Investissement files all of this under what it calls the blue economy and the regional climate plan, not a water thesis, and that is the honest read of the page: water is one seam in a generalist regional mandate, surfacing wherever the coast, the climate and an engineer-founder meet. With RSI 3 now deploying through 2029 and an investment team led by general director Pierre Joubert that came up through Sofimac Innovation and the CEA's tech arm, Région Sud Investissement is the kind of quiet public anchor a regional water sector needs more of than it admits.
Water Commitment Score
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
Portfolio · 3 water companies
Invests alongside
Highlighted = profiled on (don't) Waste Water.
Frequently asked
- What does Région Sud Investissement invest in?
- Région Sud Investissement backs small and mid-sized companies based in France's Provence-Alpes-Côte d'Azur region, taking minority equity stakes from seed through growth capital. It is a generalist regional fund, not a water specialist; its water bets cover flood-risk data, pipe-inspection robotics and water-quality monitoring, part of a wider blue-economy focus.
- Is Région Sud Investissement a water fund?
- No. Région Sud Investissement is the public co-investment fund of the Provence-Alpes-Côte d'Azur region and invests across many sectors. As of 2026 it has backed 3 water companies across 4 deals, including Hydroclimat, ACWA Robotics and BiOceanOr, rather than running a dedicated water strategy.
- Who runs Région Sud Investissement?
- Région Sud Investissement is led by general director Pierre Joubert, in post since 2020, with Alain Lacroix as president since 2018. Its investment officers include Benjamin Bessac and Marie-Stéphane de Cérou, who handle the fund's capital-innovation and deeptech deals. The region itself is RSI's sole shareholder.
- What stage and ticket size does Région Sud Investissement back?
- Région Sud Investissement invests from seed to growth capital and always as a co-investor, only committing alongside a private fund that matches its stake. Through its current RSI 3 vehicle it takes equity or convertible bonds, which is why it rarely leads a round and instead helps private money come in.
- Where is Région Sud Investissement based?
- Région Sud Investissement is headquartered in Marseille, on Boulevard de Dunkerque, with a second office in Nice. It invests only within the Provence-Alpes-Côte d'Azur region of southern France, the territory of its sole shareholder, the regional government, and co-finances its funds with the European Union's regional development programme.