Eos Energy Enterprises, Inc. completed its transition to the public markets in late 2020 through a business combination with B. Riley Principal 150 Merger Corp, the blank-check vehicle trading under ticker BMRG and sponsored by B. Riley Financial, Inc. The S-1/A amendment filed on November 13, 2020 supported registration of shares in connection with that merger, which brought Eos Energy — a U.S.-based developer of zinc-based long-duration battery energy storage systems — onto the Nasdaq under the ticker EOSE. The SPAC was formed and completed its IPO in 2020, targeting the clean energy and energy storage sector. For full filing history, deal terms, and sponsor detail on BMRG and thousands of other SPAC transactions, sign up for SpacDesk at spacdesk.com.