Seamoretech, a Portuguese startup that says it extracts critical minerals and freshwater from desalination brine, has raised €1.1 million (about $1.2 million, according to Signalbase) in the first closing of a seed round, the company said in an Oct. 30 LinkedIn post.
A second closing "opens soon," the company said. The LinkedIn post did not disclose a valuation, and the press release linked in the post was unavailable to review at the time of reporting.
"We are proud to share that #Seamoretech has raised €1.1 million in the first closing of our seed round," the company wrote.
The investors
The post thanked three institutions: Rypples, Seven Seas Capital and Crédito Agrícola. It also named four angel investors, Jerome Ternynck, Sofia Dos Santos Nunes, "Jorge J." and Jorge Gonçalves.
Some context helps here. Rypples, an ocean-focused impact investor that backs companies from its own balance sheet, launched in 2024, according to its August 2026 newsletter. Ternynck is listed on LinkedIn as a Rypples co-founder. Crédito Agrícola is a Portuguese cooperative banking group. Seamoretech did not say which Seven Seas Capital took part, and several firms have similar names, so that one remains unclear.
Dealroom, a data provider, lists a €1.1 million seed entry dated June 2026 with the same three institutions. Its data is secondary, though, and its timestamps can predate public announcements. Signalbase separately reported a $100,000 investment in the company around March 2026.
What the company says it does
Seamoretech describes its plug-and-play system as one that recovers calcium, magnesium, lithium, sodium and other minerals from brine, with the aim of reclaiming all the water in it. The company says its technology doubles freshwater recovery from desalination waste streams, meets Zero Liquid Discharge standards (a regulatory benchmark under which no liquid waste leaves a facility) and cuts carbon footprint by 80%.
All of that comes from the company itself. Research for this report found no independent validation of those figures, nor of the claim that it can supply critical minerals "at a fraction of the cost and energy of conventional mining."
In an August 2026 post, Seamoretech said the approach could extend to oil and gas and mining brines.
The team and its footprint
Sofia Delgado is co-founder and CEO, and Eva Filipa Sousa is co-founder and CTO. Prof. Adélio Mendes of the University of Porto's engineering faculty (FEUP) is listed as an advisor. LinkedIn says the company was founded in 2021 and lists 2-10 employees, a user-reported figure that may lag reality.
Seamoretech S.A. is based in the Porto area. Spain's official commercial registry, BORME, published on May 29, 2026, shows the company incorporated Seamoretech Iberia SL in Madrid, with operations starting March 27, 2026. Delgado and Sousa are its administrators. Delgado's LinkedIn activity points to openings for a senior chemical engineer and an electrotechnical engineer.
Policy interest in waste-stream minerals
Governments are looking harder at minerals locked in waste. The U.S. Department of Energy's Office of Critical Minerals and Energy Innovation announced more than $45 million on May 19, 2026, for projects that include extraction from "dilute secondary and unconventional domestic waste sources."
A 2025 U.S. Government Accountability Office spotlight said desalination brine, "traditionally considered a waste product," can yield lithium and magnesium. It put brine's mineral concentration at roughly twice that of seawater.
Competitors
The research did not identify direct brine-mining rivals. Data vendor TheCompanyCheck lists Tetra Tech, Aris Water Solutions, Seven Seas Water, Eneraqua Technologies and Bawat as competitors, but within a broad water-management category rather than brine mining specifically.
What comes next
Seamoretech plans to hold a second closing of the seed round. No use-of-proceeds details appear in the LinkedIn announcement or other available sources, and the linked press release could not be accessed.
