0001805077 2026-08-31 2026-08-31 0001805077 1 2026-08-31 2026-08-31 shares iso4217:USD pure 0001805077 EX-FILING FEES S-3 S-3ASR N/A N/A Eos Energy Enterprises, Inc. false Equity Common Stock, par value$0.0001 per share, issuable upon exercise of exercise of Warrants, Exchange Rights and Preferred Stock true 56545954 3.45 195083541.3 0.0001381 26941.04 false 195083541.3 26941.04 0 0 26941.04 <span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:6.34pt">Consists of (i) 39,149,080 shares of common stock issuable upon exercise of warrants and exchange rights, (ii) 1,159,110 additional shares issuable upon exercise of a warrant and (iii) 16,237,764 additional shares of common stock issuable upon exercise of preferred stock.</span><div style="margin-top:0.15pt;padding-left:32.65pt;padding-right:4.8pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:120%">(2)</span><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:6.34pt">Pursuant to Rule 457(c) under the Securities Act of 1933, as amended, and solely for the purpose of calculating the registration fee, the proposed maximum offering price per share is $3.45, which is the average of the high and low prices of the common stock on the Nasdaq Capital Market on August 26, 2026, which date is a date within five business days prior to the filing of this registration statement.</span></div>