A broad stock market index that tracks the performance of the roughly 3,000 largest publicly traded U.S. companies by total market value, representing almost the entire U.S. equity market. Investors use it like a big basket or thermometer: it provides a simple snapshot of overall U.S. stock market health, serves as a benchmark for funds and portfolios, and helps measure diversification, risk and returns over time.
russell us indexesfinancial
A family of widely used benchmarks that group U.S. publicly traded companies by size and style (examples include large-cap and small-cap groupings). Investors and fund managers use these indexes as yardsticks to measure market performance, build index-tracking funds, and benchmark portfolio results—similar to using a ruler to compare heights. Changes in these indexes can influence investment flows and the prices of stocks included in them.
li-metaltechnical
Lithium metal is the elemental form of lithium used as a lightweight, highly reactive material in batteries and specialty industrial applications. It matters to investors because batteries that use lithium metal can store more energy in the same size or weight—like swapping a small fuel tank for a bigger one—potentially boosting electric vehicle range and lowering costs, which affects manufacturers, raw-material suppliers and the broader clean-energy supply chain.
li-iontechnical
A li-ion (lithium-ion) battery is a rechargeable energy storage cell commonly used in phones, laptops, electric vehicles and grid storage; it stores and releases electrical energy by moving lithium ions between electrodes. Investors care because these batteries drive demand for key raw materials, manufacturing capacity and recycling streams, and their cost, lifespan and safety performance directly affect product economics and company valuations — think of them as the fuel tank and supply chain backbone for many modern devices and vehicles.
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WOBURN, Mass.--(BUSINESS WIRE)--
SES AI Corporation (“SES AI,” the “Company,” “we” or “us”) (NYSE: SES), a global leader in the development and manufacturing of AI-enhanced high-performance Li-Metal and Li-ion batteries, today announced that it has been added to the Russell 3000® Index. The newly reconstituted Russell 3000® Index will begin trading at the market open on Monday, June 29, 2026.
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 US indexes, which belong to FTSE Russell, the global index provider.
SES AI Corp. (NYSE: SES) is powering the future of global electric transportation on land and in the air with the world’s most advanced Li-Metal batteries. SES AI is the first battery company in the world to accelerate its pace of innovation by utilizing superintelligent AI across the spectrum of its business, from research and development; materials sourcing; cell design; engineering and manufacturing; to battery health and safety monitoring. Founded in 2012, SES AI is an Li-Metal battery developer and manufacturer headquartered in Boston and with operations in Singapore, Shanghai, and Seoul. Learn more at SES.AI.
