374Water Appoints Finance Veteran Charles Weiser to Board Amid Commercialization Push

MORRISVILLE, S.C. – December 29, 2025 – In a strategic move signaling a sharpened focus on financial discipline and growth, 374Water Inc. (NASDAQ: SCWO) today announced the appointment of seasoned finance executive Charles Weiser, CPA, to its Board of Directors. The appointment, effective immediately, comes as the cleantech company works to commercialize its innovative waste-to-resource technology and expand its service offerings.

Weiser, a long-time investor in the company, brings a formidable resume of financial leadership and strategic planning from both public and private enterprises. His addition to the board is seen as a critical step in fortifying the company's governance and operational strategy as it transitions from development to full-scale market deployment.

A Veteran Financier for a Growth-Stage Company

Charles Weiser’s career is distinguished by extensive experience in finance, accounting, strategic planning, and business development. He currently serves as the Chief Financial Officer of Alonti Catering Kitchens, where he is responsible for the company’s entire financial apparatus, including accounting, tax, and strategic planning. His background is particularly relevant to a growth-stage technology firm like 374Water, which must navigate the complex financial landscape of scaling operations and securing market share.

Prior to his role at Alonti, Weiser was a Managing Director at Imperial-Texas, providing high-level accounting and consulting services to a diverse global client base. This role honed his ability to analyze and advise various business models. Previously, he served as Executive Vice President and Chief Financial Officer at American Green Technology, a global manufacturer in the commercial and industrial lighting sector. His experience guiding companies with international reach and complex supply chains will be invaluable to 374Water as it targets global industrial, municipal, and federal markets.

An alumnus of the University of Texas, Austin, Weiser holds both an MBA in Finance/Accounting and a BBA in General Business. As a Certified Public Accountant (CPA) in Texas and Florida, he brings a rigorous standard of financial oversight and compliance to the board. This expertise is crucial for a publicly traded company aiming to build investor confidence and ensure robust financial health.

The Strategic Push to Commercialize AirSCWO

Weiser joins 374Water at what CEO Stephen J. Jones described as a pivotal time. The company is intensely focused on the commercialization of its flagship AirSCWO technology. SCWO, or Supercritical Water Oxidation, is an advanced thermal process that uses the unique properties of water above its critical point (374 °C and 221 bar) to completely break down organic waste.

374Water's proprietary AirSCWO system is designed to be a comprehensive solution for some of the world's most persistent waste challenges. It can efficiently destroy a wide spectrum of organic materials, including hazardous and non-hazardous wastes like PFAS 'forever chemicals,' industrial sludges, and municipal biosolids. The process mineralizes the waste, converting it into safe, dischargeable water, a small stream of harmless minerals, clean vent gas, and recoverable heat energy. This positions the technology not just as a disposal method, but as a resource recovery system.

The company is building its business around two core pillars: selling AirSCWO units and developing a “Waste Destruction Services” business. This dual approach allows for upfront capital sales while also creating a recurring revenue stream by offering treatment as a service. Weiser’s background in strategic financial planning will be instrumental in modeling and executing this hybrid business strategy, ensuring it is both profitable and sustainable.

Stephen J. Jones, Chairperson and Interim President and CEO, highlighted the significance of the appointment. “His significant financial expertise and senior management background across a portfolio of growth companies will be instrumental in supporting 374Water’s evolution as we continue to focus on commercialization of our AirSCWO technology and building our Waste Destruction Services business,” Jones stated.

Aligning Governance with Shareholder Value

The appointment is not merely about adding financial acumen; it is also a deliberate move in corporate governance. Jones noted that the decision was made in connection with a “working agreement with our largest shareholder.” This suggests a collaborative effort to strengthen the board and align its oversight with the interests of its key financial backers, effectively positioning 374Water for its next commercial phase.

This alignment is further underscored by Weiser's personal history with the company. “My family, friends, and I have been long time investors in 374Water, since before its listing on NASDAQ in 2022,” Weiser said in a statement. “I’m looking forward to working with the Board and Management to support the Company on behalf of all of our shareholders.”

His transition from a passive, long-term investor to an active board member brings a unique and powerful perspective to the boardroom. It demonstrates a deep-seated belief in the company's mission and technology, combined with a vested interest in ensuring management executes its strategy effectively to deliver shareholder returns. This dual role as both director and shareholder representative can foster a culture of accountability and a relentless focus on creating long-term value.

As 374Water moves forward, it faces the typical challenges of a disruptive technology company: scaling manufacturing, securing marquee clients, navigating regulatory landscapes, and managing cash flow. Having a seasoned financial strategist like Charles Weiser on the board provides the critical oversight needed to transform technological potential into commercial success and market leadership in the rapidly evolving world of waste management.