 NEW YORK EDISON, N.J.--BUSINESS WIRE--B. Riley Principal Merger Corp. II NYSE: BMRG, BMRG WS, BMRG.U BMRG, a special purpose acquisition company sponsored by an affiliate of B. Riley Financial, Inc. Nasdaq: RILY B. Riley Financial, and Eos Energy Storage, LLC, a leading manufacturer of safe, reliable, low-cost zinc battery storage systems, today announced the completion of their previously announced business combination. The business combination has a projected pro forma market 