A leading provider of non-lithium energy storage solutions, has been added as a member of the Russell Microcap® Index, which was effective upon U.S. market openings on June 29, as part of the first 2026 Russell indexes reconstitution. Inclusion in the Russell Microcap® Index further validates ESS’ strategic focus on addressing rapidly expanding demand for safe, non-lithium energy storage solutions.
“We are pleased to be added to the Russell Microcap® Index at a pivotal moment for ESS,” said Drew Buckley, CEO of ESS. “We are accelerating development of our U.S. made, sodium-ion battery platform to meet growing demand from AI infrastructure, data centers, and other high-growth markets, with early-stage opportunities approaching $1 billion, while continuing to advance our iron flow technology for long-duration applications. We believe inclusion in the Russell Index will expand our visibility with institutional investors as we focus on delivering long-term value for our customers and shareholders.”
Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. According to data as of the end of June 2025, about $12.2 trillion in assets are benchmarked against the Russell U.S. Indexes, which belong to FTSE Russell, the global index provider.
The June reconstitution of the Russell US indexes captures up to the 4,000 largest US stocks as of April 30, ranking them by total market capitalization. Membership in the Russell 3000® Index is re-evaluated twice per year and includes an automatic addition to the large-cap Russell 1000® Index or small-cap Russell 2000® Index as well as the appropriate growth and value style indexes. FTSE Russell determines membership for its Russell indexes primarily by objective, market-capitalization rankings and style attributes.
For more information on the Russell Microcap® Index and the Russell indexes reconstitution, go to the “Russell Reconstitution” section on the FTSE Russell website.
About ESS Tech, Inc.
ESS (NYSE: GWH) is the leading provider of non-lithium energy storage solutions. ESS was established in 2011 with a mission to accelerate decarbonization safely and sustainably through longer lasting energy storage. Using easy-to-source materials, ESS solutions enable energy security, reliability and resilience. We build flexible storage solutions that allow our customers to meet increasing energy demand without power disruptions and maximize the value potential of excess energy. For more information visit www.essinc.com.
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