Eos Energy Enterprises, Inc.

Eos Energy Enterprises, Inc. traces its public-market origins to B. Riley Principal 150 Merger Corp. (Nasdaq: BMRG), a blank-check company sponsored by B. Riley Financial that completed its initial public offering in 2020 targeting the energy and clean-technology sector. The vehicle merged with Eos Energy Enterprises, a developer of zinc-based long-duration battery storage systems, closing the de-SPAC transaction in November 2020; the combined company subsequently traded on Nasdaq under the ticker EOSE. The legacy filing entity submitted an 8-K with the SEC on June 5, 2026, under accession number 0001628280-26-041078. For full filing history, sponsor data, and deal analytics on BMRG and the broader SPAC universe, create a free account at SpacDesk.