Rainmaker Raises $100M Series B for Drone-Based Cloud Seeding

Rainmaker Secures $100M Series B

Rainmaker Technology Corporation, a cloud seeding company based in El Segundo, California, has raised $100 million in Series B funding. The round was announced on September 21, 2026.

What Rainmaker Does

Rainmaker works to increase freshwater supply through cloud seeding operations. The company's approach combines several technical elements:

• Weather-resistant drones — flown into winter storm clouds
• Silver iodide release — a seeding agent that prompts ice crystal formation
• Yield measurement — each operation's results are measured using the company's own radar and validation systems

The goal is to generate additional rain or snowfall from winter storm systems.

Validation Milestone

In 2026, Rainmaker reported the first private-sector physical validation of cloud-seeding results. This is a notable claim in an industry where measuring the effectiveness of seeding operations has historically been difficult.

Operational Footprint

Rainmaker runs programs across five western U.S. states:

• Utah
• Idaho
• Oregon
• California
• Colorado

These are markets where water scarcity and winter storm activity intersect, creating demand for additional freshwater supply.

Investors

The Series B included participation from:

• Upfront Ventures
• Lowercarbon Capital
• Dream Ventures
• NOA VC
• DCVC

No lead investor was disclosed in the available information.

Company Background

Rainmaker Technology Corporation was founded in 2023. The company is headquartered in El Segundo, California.

Why This Matters for Acquirers

Water supply is a long-duration infrastructure problem, and Rainmaker's approach sits at the intersection of climate technology, aerospace, and water resource management. Several factors make the company relevant to strategic acquirers:

1. Validation infrastructure — The company's radar and measurement systems are central to its value proposition. In cloud seeding, the ability to demonstrate measurable yield is a differentiator, and that measurement capability could be valuable independent of the seeding operations themselves.
2. Multi-state operations — Programs across five states suggest regulatory and operational experience that would be difficult to replicate quickly.
3. Climate capital backing — The investor list includes firms with climate and deep-tech focus, indicating institutional conviction in the category.

The $100 million Series B is a substantial round for a company founded in 2023, reflecting the capital intensity of drone operations, radar infrastructure, and multi-state program deployment.

Acquisition Angle

For acquirers in water utilities, climate infrastructure, aerospace, or agricultural technology, Rainmaker represents a scaled early-stage asset with proprietary measurement technology and an established operational footprint across the western United States. The Series B capital positions the company to expand programs and further develop its validation systems.

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