Vaulted Deep Raises $35M Debt Round Led by Mediobanca

Vaulted Deep Closes $35 Million Debt Financing

Vaulted Deep, a Houston-based company building subsurface infrastructure for organic waste disposal and permanent carbon removal, has raised $35 million in debt financing. The round is led by Mediobanca, which is the sole investor named in the transaction.

What Vaulted Deep Does

Vaulted Deep builds and operates subsurface infrastructure that converts organic waste streams into a slurry and injects it thousands of feet underground using proven deep well injection technology. The waste streams it handles include:

• Biosolids
• Manure
• Agricultural byproducts
• Paper sludge

The company was spun out of Advantek, an industrial waste manager, and is headquartered in Houston, Texas. It serves municipalities, industrial operators and agricultural producers.

Operational Footprint

Vaulted Deep operates from two named sites:

• Hutchinson, Kansas — the company's Great Plains site
• Terminal Island, Los Angeles — its Los Angeles facility

A site in Weld County, Colorado is planned for 2027.

Technology and Site Development

An AI-accelerated site development platform helps Vaulted Deep identify, permit and operate new injection wells. That capability matters because the company's growth model depends on bringing new subsurface sites online — each requiring identification, permitting and operational build-out. Shortening that cycle is central to scaling the business.

The underlying disposal method is deep well injection, a proven technology rather than an experimental one. Vaulted Deep's proposition combines that established approach with a waste-to-slurry process and a software layer for site development.

Why the Debt Facility Matters

Vaulted Deep's business is infrastructure-heavy. Injection wells, slurry processing and site operations require substantial upfront capital before revenue scales. A $35 million debt facility is structured capital suited to that profile — funding physical assets and site development rather than general corporate purposes.

Mediobanca's role as lead and sole investor gives Vaulted Deep a single, focused financing counterparty as it advances its pipeline of sites, including the planned Weld County, Colorado location targeted for 2027.

The Dual Market: Waste Disposal and Carbon Removal

Vaulted Deep sits at the intersection of two markets. On one side, it provides organic waste disposal for municipalities, industrial operators and agricultural producers — a services business with identifiable counterparties and waste streams. On the other, the same injection infrastructure delivers permanent carbon removal, since organic material injected deep underground is sequestered rather than decomposing and releasing carbon.

That dual framing is important for how the company is positioned: it is not solely dependent on carbon markets, nor solely a waste hauler. The infrastructure serves both.

Company Snapshot

• Company: Vaulted Deep
• Headquarters: Houston, Texas
• Origin: Spun out of Advantek, an industrial waste manager
• Sector: Subsurface infrastructure — organic waste disposal and permanent carbon removal
• Technology: Deep well injection; AI-accelerated site development platform
• Waste streams: Biosolids, manure, agricultural byproducts, paper sludge
• Customers: Municipalities, industrial operators, agricultural producers
• Sites: Hutchinson, Kansas (Great Plains); Terminal Island, Los Angeles; Weld County, Colorado planned for 2027
• Round type: Debt
• Amount: $35,000,000
• Lead investor: Mediobanca
• Investors: Mediobanca
• Funding date: 21 September 2026

What to Watch

The debt raise positions Vaulted Deep to continue developing injection capacity across its existing footprint and its planned Colorado site. The key questions are execution on permitting and site development timelines, and how quickly the company converts its pipeline into operating wells serving both waste disposal and carbon removal demand.