<div id="readability-page-1"><div>Stidolph Russell Monoki Chairman of the Board of Eos Energy Enterprises Inc [EOSE] filed a Form 4 on December 8, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:<div><table><tbody><tr><th>Date</th><th>Transaction</th><th>Shares</th><th>Price</th><th>Value</th></tr><tr><td>12/5/25-12/8/25</td><td>Sale</td><td>766,134</td><td>$14.97</td><td>$11,471,784</td></tr><tr><td>12/5/25</td><td>Gift</td><td>75,000</td><td>$0.00</td><td>N/A</td></tr><tr><td colspan="5"> </td></tr><tr><td>12/8/25</td><td>Exercise(1)</td><td>296,439</td><td>$3.02</td><td>$895,246</td></tr><tr><td>12/8/25</td><td>Surrender(2)</td><td>60,304</td><td>$14.85</td><td>$895,225</td></tr></tbody></table></div>Ending Holdings: 2,412,628 (364,355 - Direct, 2,048,273 - Indirect)<div><table><tbody><tr><td>(1)</td><td>145,018 shares exercised 1.4 years before expiration date.</td></tr><tr><td> </td><td>120,633 shares exercised 2.4 years before expiration date.</td></tr><tr><td> </td><td>30,788 shares exercised on expiration date.</td></tr><tr><td>(2)</td><td>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</td></tr></tbody></table></div>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data. </div></div>

EOSE

Chairman Russell Monoki Stidolph of Eos Energy Enterprises Inc sold 766,134 shares worth $11.5M, filed on Dec 8, 2025. Transactions included sales, gifts, exercises, and surrenders of shares, with ending holdings of 2,412,628 shares. The Washington Service offers insider trading analysis and data services.

Chmn Stidolph Sells 766,134 ($11.5M) Of Eos Energy Enterprises Inc [EOSE]