<?xml version="1.0" encoding="UTF-8" ?><!-- Generated on Tue, 20 Oct 2026 15:21:10 -0400--><rss version="2.0">
    <channel>
        <title>Tecogen, Inc. (TGEN) SEC Filings</title>
        <link>https://ir.tecogen.com/all-sec-filings/rss</link>
        <description>Tecogen, Inc. (TGEN) - All SEC Filings</description>
        <language>en-us</language>
                                            <image>
                <url>https://d1io3yog0oux5.cloudfront.net/tecogen/files/tecogen-logo.png</url>
                <title>Tecogen, Inc. Logo</title>
                <link>https://ir.tecogen.com</link>
            </image>
                <generator>Equisolve Investor Relations Suite</generator>
        
                            <item>
                <title><![CDATA[8-K - Current report]]></title>
                <description><![CDATA[3 Related Documents: 8-K, EX-99.1, EX-99.2]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4688-0001537435-26-000092</link>
                <pubDate>Wed, 14 Oct 26 12:03:00 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4688-0001537435-26-000092</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4/A - Statement of changes in beneficial ownership of securities]]></title>
                <description><![CDATA[4/A]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4687-0001537435-26-000088</link>
                <pubDate>Tue, 08 Sep 26 17:12:37 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4687-0001537435-26-000088</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4/A - Statement of changes in beneficial ownership of securities]]></title>
                <description><![CDATA[4/A]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4686-0001808199-26-000003</link>
                <pubDate>Tue, 08 Sep 26 17:12:21 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4686-0001808199-26-000003</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4/A - Statement of changes in beneficial ownership of securities]]></title>
                <description><![CDATA[4/A]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4685-0001585814-26-000003</link>
                <pubDate>Tue, 08 Sep 26 17:11:45 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4685-0001585814-26-000003</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4/A - Statement of changes in beneficial ownership of securities]]></title>
                <description><![CDATA[4/A]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4684-0001537435-26-000087</link>
                <pubDate>Tue, 08 Sep 26 17:11:02 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4684-0001537435-26-000087</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4/A - Statement of changes in beneficial ownership of securities]]></title>
                <description><![CDATA[4/A]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4683-0001537435-26-000086</link>
                <pubDate>Tue, 08 Sep 26 17:09:24 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4683-0001537435-26-000086</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[EFFECT - Notice of Effectiveness]]></title>
                <description><![CDATA[EFFECT]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4681-9999999995-26-002885</link>
                <pubDate>Fri, 04 Sep 26 06:04:33 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4681-9999999995-26-002885</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[424B3 - Prospectus [Rule 424(b)(3)]]]></title>
                <description><![CDATA[424B3]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4682-0001537435-26-000079</link>
                <pubDate>Fri, 04 Sep 26 10:17:13 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4682-0001537435-26-000079</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[EFFECT - Notice of Effectiveness]]></title>
                <description><![CDATA[EFFECT]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4680-9999999995-26-002842</link>
                <pubDate>Wed, 02 Sep 26 06:05:41 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4680-9999999995-26-002842</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[POS AM - Post-effective amendment to a registration statement that is not immediately effective upon filing]]></title>
                <description><![CDATA[POS AM]]></description>
                <link>https://ir.tecogen.com/all-sec-filings?page=1#document-4679-0001537435-26-000075</link>
                <pubDate>Tue, 01 Sep 26 11:08:34 -0400</pubDate>
                <guid isPermalink="true">https://ir.tecogen.com/all-sec-filings?page=1#document-4679-0001537435-26-000075</guid>
                                                                            </item>
            </channel>
</rss>