Global stock benchmarking group FTSE Russell has released the reconstituted version of its Russell 3000 stock index for June 2026, adding a number of clean energy companies operating in the United States.
Leading among the renewable energy additions to the index are SOLV Energy, Inc.(NASDAQ:MWH), Canadian Solar (NASDAQ:CSIQ), and Energy Vault (NYSE:NRGV). Other notable additions include SES AI (NYSE:SES), Toyo (NASDAQ:TOYO), American Resources Corporation (NASDAQ:AREC) and Tigo Energy (NASDAQ:TYGO).
One notable clean energy company removed from the index for 2026 is SunPower (NASDAQ: SPWR), a move which was largely expected following the company’s financial struggles, bankruptcy filing, and subsequent sell-off of its assets (including the acquisition of its U.S. brand by Complete Solaria, which then rebranded to once again become SunPower).
The index, which tracks the 3,000 largest U.S. stocks by market capitalization, has just switched to a semi-annual reconstitution, which will result in similar additions and deletions of companies in December.
“Recent periods of increased market volatility and dispersion in US equities, coupled with a strong expansion of the volume of assets benchmarked to Russell US Indexes, have highlighted the need for a more regular and responsive approach,” the organization said in a statement regarding the decision to switch from annual to semi-annual reconstitution.
Details on newly-listed companies
SOLV Energy is one of the largest utility-scale solar engineering, procurement, and construction (EPC) and operations and maintenance (O&M) providers in the country. The company has recently been active in the acquisitions market, adding high-voltage construction firms Roberson Waite Electric in May and Spartan Infrastructure in June, 2025. The company’s market cap as of close on Monday was greater than $7.4 billion.
Despite being publicly traded on the NASDAQ since 2006, Canadian Solar has historically been excluded from the Russell 3,000 index. The company, whose market cap is now just over $1 billion, underwent a restructuring in late 2025 that brought about a new domestic joint venture, CS PowerTech, to operate its U.S. manufacturing and sales divisions. The company’s e-STORAGE business has been a particular bright spot as of late, landing deals for huge battery energy storage systems (BESS), like the 500 MW/2,493 MWh utility energy storage project it announced in March.
Energy Vault, a provider of grid-scale BESS and developer of a novel “gravity battery” system that stores and releases energy by mechanically lifting and lowering massive composite blocks, has also been busy in recent months, signing on customers for hundreds of megawatts of capacity in Texas and Michigan, and bringing online a hybrid fuel cell/BESS system in California.The company says its “Own & Operate” asset management strategy has allowed it to generate predictable, recurring revenue streams.
SES AI, a developer and manufacturer of lithium metal and lithium ion batteries, has recently announced version 3.0 of its Molecular Universe AI material discovery platform. The company also manufactures battery cells for urban air mobility (UAM) applications in Korea, in partnership with cell maker Top Material.
Toyo Solar is planning a $357 mill;ion, 1.5 GW Texas solar cell factory, for which it recently raised a $50 million direct offering, overseen by Roth Capital Partners and H.C. Wainwright & Co. The company has also been recently accused of evading anti-circumvention rules targeting Ethiopia, a claim which the company says is “riddled with misinformation.”
American Resources Corporation is working through a pivot from its former fossil-fuel focus and is now working to refine and supply the rare earth and critical minerals necessary for advanced manufacturing and EV battery electrification.
Tigo Energy is now manufacturing module-level power electronics to be integrated with systems from EG4 Electronics. Earlier this year, the company announced its Predict+ software for grid data modeling, as well as the Tigo Energy Intelligence platform for commissioning home solar and energy storage installations.
