<?xml version="1.0" encoding="UTF-8" ?><!-- Generated on Fri, 24 Apr 2026 14:59:47 -0400--><rss version="2.0">
    <channel>
        <title>Onterris, Inc. (MEG) Presentations</title>
        <link>https://ir.onterris.com/news-events/presentations/rss</link>
        <description></description>
        <language>en-us</language>
                                            <image>
                <url>https://d1io3yog0oux5.cloudfront.net/_ca88d8f187714163e7bece74f32b12c7/onterris/files/theme/images/logo-sm.png</url>
                <title>Onterris, Inc. Logo</title>
                <link></link>
            </image>
                <generator>Equisolve Investor Relations Suite</generator>
        
                            <item>
                <title><![CDATA[Montrose is Now Onterris]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34840/pdf/Montrose+Environmental+is+Now+Onterris.pdf</link>
                <pubDate>Tue, 21 Apr 26 00:00:00 -0400</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34840/pdf/Montrose+Environmental+is+Now+Onterris.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4Q25 Earnings Call Presentation]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34544/pdf/Montrose-Environmental-Group-Announces-Record-2025-Results-and-Increases-2026-Guidance.pdf</link>
                <pubDate>Thu, 26 Feb 26 00:00:00 -0500</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34544/pdf/Montrose-Environmental-Group-Announces-Record-2025-Results-and-Increases-2026-Guidance.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[Investor Presentation - December 2025]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34543/pdf/Montrose-Environmental-Group-December-2025-Investor-Presentation.pdf</link>
                <pubDate>Fri, 19 Dec 25 00:00:00 -0500</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34543/pdf/Montrose-Environmental-Group-December-2025-Investor-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[3Q25 Earnings Call Presentation]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34542/pdf/Montrose-3Q25-Earnings-Call-Presentation.pdf</link>
                <pubDate>Wed, 05 Nov 25 00:00:00 -0500</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34542/pdf/Montrose-3Q25-Earnings-Call-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[Investor Presentation - September 2025]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34541/pdf/Montrose-Environmental-September-2025-Investor-Presentation.pdf</link>
                <pubDate>Tue, 02 Sep 25 00:00:00 -0400</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34541/pdf/Montrose-Environmental-September-2025-Investor-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[2Q25 Earnings Call Presentation]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34540/pdf/Montrose-2Q25-Earnings-Call-Presentation.pdf</link>
                <pubDate>Thu, 07 Aug 25 00:00:00 -0400</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34540/pdf/Montrose-2Q25-Earnings-Call-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[Investor Presentation - June 2025]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34539/pdf/Montrose-June-2025-Investor-Presentation.pdf</link>
                <pubDate>Wed, 04 Jun 25 00:00:00 -0400</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34539/pdf/Montrose-June-2025-Investor-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[1Q25 Earnings Call Presentation]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34538/pdf/Montrose-1Q25-Earnings-Call-Presentation.pdf</link>
                <pubDate>Thu, 08 May 25 00:00:00 -0400</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34538/pdf/Montrose-1Q25-Earnings-Call-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[4Q24 Earnings Call Presentation]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34537/pdf/Montrose-4Q24-Earnings-Call-Presentation.pdf</link>
                <pubDate>Wed, 26 Feb 25 00:00:00 -0500</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34537/pdf/Montrose-4Q24-Earnings-Call-Presentation.pdf</guid>
                                                                            </item>
                    <item>
                <title><![CDATA[Investor Presentation - November 2024]]></title>
                <description><![CDATA[]]></description>
                <link>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34536/pdf/Montrose_November-2024_Investor-Deck_FINAL.pdf</link>
                <pubDate>Mon, 11 Nov 24 00:00:00 -0500</pubDate>
                <guid>https://d1io3yog0oux5.cloudfront.net/_27d95a734ee4d14f290867e16abf1c79/onterris/db/3575/34536/pdf/Montrose_November-2024_Investor-Deck_FINAL.pdf</guid>
                                                                            </item>
            </channel>
</rss>