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RENN Fund Inc is active in the financial services domain. It is a a registered, non-diversified, closed-end management investment company formed to provide return through capital appreciation and income by a long-term, value-oriented investment process that invests in a wide variety of financial instruments, including but not limited to, common stocks, fixed-income securities including convertible and non-convertible debt securities or loans, distressed debt, warrants, and preferred stock, exchange-traded funds and exchange-traded notes, and other instruments. It invests in various industries, including communication services, surgical and medical instruments and apparatus, oil and gas, medical chemicals, botanical products, etc.
ESS Tech Inc is a long-duration energy storage company specializing in iron flow battery technology. The company design and produce long-duration batteries predominantly using earth-abundant materials.