<div id="readability-page-1"><div><p><span>Ferguson Lewis H, Director of Cogent Communications Holdings Inc [CCOI], filed a Form 144 on December 1, 2025 with the Securities and Exchange Commission proposing to sell restricted securities:</span></p><div><table><tbody><tr><td><span>Approximate Date Of Sale</span></td><td><span>12/1/25</span></td></tr><tr><td><span>Shares</span></td><td><span>4,000</span></td></tr><tr><td><span>Broker</span></td><td><span>RBC Wealth Management</span></td></tr></tbody></table></div><p><span>Prior to the sale of restricted stock, owners must file a Form 144 with the SEC.  Upon submission of the filing to the SEC the owner is permitted to sell the shares, or any fraction thereof, within 90 days.</span></p><p><span>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.</span></p><p><span>Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data.</span></p><span> </span></div></div>

CCOI

<p>Ferguson Lewis H, Director of Cogent Communications Holdings Inc, filed a Form 144 with the SEC to sell 4,000 shares of restricted stock on December 1, 2025. The sale will be managed by RBC Wealth Management. Filing Form 144 is a prerequisite for selling restricted securities, allowing the sale within 90 days of filing.</p>

Dir Ferguson Files To Sell 4,000 Of Cogent Communications Holdings Inc [CCOI]