Mr. Peter Londa reports

TANTALUS SYSTEMS ADDED TO NASDAQ OMX CLEAN EDGE SMART GRID INFRASTRUCTURE INDEX AND FIRST TRUST SMART GRID INFRASTRUCTURE ETF (GRID)

Tantalus Systems Holding Inc. has been added to the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index, effective prior to market open on Sept. 21, 2026, as part of the index's September, 2026, semi-annual reconstitution. With its inclusion in the QGRD index, Tantalus is now a holding of the First Trust Nasdaq Clean Edge Smart Grid Infrastructure Index Fund, an exchange-traded fund that tracks the QGRD index and reported approximately $12.1-billion (U.S.) in net assets as of Sept. 22, 2026.

Launched in November, 2009, the fund is dedicated to smart grid and electric infrastructure, giving institutional and retail investors exposure to the companies modernizing the electric grid. Inclusion in the index and the fund broadens Tantalus's visibility among investors focused on grid modernization, electrification and energy infrastructure.

The QGRD index is designed to act as a transparent and liquid benchmark for the smart grid and electric infrastructure sector, tracking companies globally that are primarily engaged in electric grid technologies; electric meters, devices and networks; energy storage and management; and enabling software. The QGRD index includes both companies focused specifically on the smart grid sector and diversified companies with exposure to grid modernization, and is evaluated semi-annually in March and September against eligibility criteria that include minimum market capitalization and average daily trading volume. Tantalus was one of seven companies added to the QGRD index in the September, 2026, reconstitution.

Tantalus delivers data-centric solutions that help utilities -- and the communities they serve -- modernize their distribution grids. Through the Tantalus grid modernization platform, the company delivers unified intelligence across the entire distribution grid, from the substation to devices located behind the meter, ensuring the right data flow from the right device to the right system at the right time. Its modular, reverse-compatible architecture provides true data interoperability across devices, systems and vendors, including legacy infrastructure, giving utilities a practical, cost-effective and lower-risk path to grid modernization.

"Joining the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index, and with it the First Trust GRID ETF, is a reflection of Tantalus's role in the broader ecosystem of companies building the modern electric grid. It also creates more opportunities for investment by investors focused on grid modernization," said Peter Londa, president and chief executive officer of Tantalus. "Utilities are facing unprecedented demands on the distribution grid from aging infrastructure, accelerating electrification and the rapid growth of new industrial load. Meeting those demands starts with data. Our unified intelligence approach gives utilities visibility, intelligence and flexibility across their entire distribution grid, from the substation to behind the meter, so they can get the most value from the infrastructure they already own while preparing for what comes next."

More than 340 utility partners across North America rely on Tantalus solutions to modernize their distribution grids and achieve mission-critical outcomes, including resiliency, reliability, flexibility, affordability, sustainability and security. In fact, in December, 2025, Frost & Sullivan, an independent research firm, named Tantalus a top-25 vendor in its report, "Top 25 for 2025: Companies to Action in the Power Grids Industry, Global, 2025."

A complete list of additions and deletions to the QGRD index as part of the September, 2026, semi-annual reconstitution is available in Clean Edge's Sept. 21, 2026, announcement.

About Tantalus Systems Holding Inc.

Tantalus is a technology company dedicated to helping public power and electric co-operative utilities -- and the communities they serve -- modernize their distribution grids by harnessing the power of data across all their devices and systems deployed throughout the entire distribution grid. For more than 35 years, Tantalus has delivered data-centric solutions to utilities and today works alongside more than 340 utility partners. The Tantalus grid modernization platform spans multiple levels: intelligent connected devices, communications networks, data management, enterprise applications and analytics. Its modular, reverse-compatible architecture delivers true data interoperability across devices, systems and vendors, including legacy infrastructure, so utilities can get the most value from existing infrastructure investments while leveraging advanced capabilities to plan for future requirements. Its technology is grounded in a data-centric approach that is designed to help utilities find the most cost-effective path to grid modernization with the least risk. Ultimately, it delivers unified intelligence to utilities of all kinds, so they can leverage data and insights across their entire grid, no matter what devices, systems or vendors they choose to work with.

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