Tecogen Business Update

About this update from Tecogen Inc.

NORTH BILLERICA, MA / ACCESS Newswire / July 6, 2026 / Tecogen Inc. (NYSE American:TGEN), a leading manufacturer of clean energy products and efficient on-site power and cooling solutions, is pleased to announce: Russell ReconstitutionRussell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. The June Russell US Indexes reconstitution captures up to the 4,000 largest US stocks as of Wednesday, April 30th, ranking them by total market capitalization. Membership in the Russell Microcap® Index, which remains in place for half a year beginning 2026, means automatic inclusion in the appropriate growth and value style indexes. FTSE Russell determines membership for its Russell indexes primarily by objective, market-capitalization rankings and style attributes. About TecogenTecogen Inc. designs, manufactures, sells, installs, and maintains high efficiency, ultra-clean, cogeneration products including combined heat and power, air conditioning systems and high-efficiency water heaters for residential, commercial, recreational and industrial applications. The company's cost efficient, reliable, and environmentally friendly products for energy production nearly eliminate criteria pollutants and significantly reduce customers' carbon footprint. In business for over 35 years, Tecogen has shipped more than 3,200 units, supported by an established network of engineering, sales, and service personnel in key markets in North America. For more information, please visit www.tecogen.com or contact us for a free Site Assessment. Tecogen, InVerde e+, Tecochill, Tecofrost, Tecopack, Tecopower, and Ultera are registered trademarks of Tecogen Inc.

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