Corecentric Investor Conference Presentation Deck

Important Notices (continued) Use of Projections This presentation contains financial forecasts for Corcentric with respect to certain financial results for Corcentric's fiscal years through 2023. Neither North Mountain's nor Corcentric's independent auditors have not audited, studied, reviewed, compiled or performed any procedures with respect to the projections for the purpose of their inclusion in this presentation, and accordingly, they did not express an opinion or provide any other form of assurance with respect thereto for the purpose of this presentation. These projections are forward- looking statements and should not be relied upon as being necessarily indicative of future results. In this presentation, certain of the above-mentioned projected information has been provided for purposes of providing comparisons with historical data. The assumptions and estimates underlying the prospective financial information are inherently uncertain and are subject to a wide variety of significant business, economic and competitive risks and uncertainties that could cause actual results to differ materially from those contained in the prospective financial information. Accordingly, there can be no assurance that the prospective results are indicative of the future performance of Corcentric or that actual results will not differ materially from those presented in the prospective financial information. Inclusion of the prospective financial information in this presentation should not be regarded as a representation by any person that the results contained in the prospective financial information will be achieved. Since the projections cover multiple years, such information by its nature becomes less reliable with each successive year. Non-GAAP Financial Measures This presentation contains certain financial information, such as EBITDA, EBITDA CAGR, EBITDA Margin, Adjusted EBITDA, Adjusted gross profit, Adjusted gross profit margin, which have not been prepared in accordance with United States generally accepted accounting principles ("GAAP"). North Mountain and Corcentric believe these non-GAAP measures of financial results provide useful information to management and investors regarding certain financial and business trends relating to Corcentric's financial condition and results of operations. North Mountain and Corcentric believe that the use of these non-GAAP financial measures provides an additional tool for investors to use in evaluating projected operating results and trends in and in comparing Corcentric's financial measures with other similar companies, many of which present similar non-GAAP financial measures to investors. Management does not consider these non-GAAP measures isolation or as an alternative to financial measures determined in accordance with GAAP. The principal limitation of these non-GAAP financial measures is that they exclude significant expenses and income that are required by GAAP to be recorded in Corcentric's financial statements. Given the inherent uncertainty regarding projections, projected non-GAAP measures have not been reconciled back to the nearest GAAP measure. In addition, they are subject to inherent limitations as they reflect the exercise of judgments by management about which expense and income are excluded or included in determining these non-GAAP financial measures. You should review North Mountain's and Corcentric's audited financial statements, included in the Registration Statement. Please refer to the Appendix for a reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measures. Trademarks This presentation contains trademarks, service marks, trade names and copyrights of North Mountain, Corcentric and other companies, which are the property of their respective owners. Participants in the Solicitation North Mountain, North Mountain's sponsor, Corcentric and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of North Mountain, in connection with the proposed Business Combination. Information regarding North Mountain's directors and executive officers is contained in North Mountain's Annual Report on Form 10-K for the year ended December 31, 2021, which is filed with the SEC. Additional information regarding the interests of those participants, the directors and executive officers of Corcentric and other persons who may be deemed participants in the Business Combination may be obtained by reading the Registration Statement and the proxy statement/prospectus and other relevant documents filed with the SEC. Free copies of these documents may be obtained as described above. No Offer or Solicitation This presentation is for informational purposes only and shall not constitute a proxy statement or solicitation of a proxy, consent, or authorization with respect to any securities or in respect of the proposed Business Combination. This presentation shall also not constitute an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sale, issuance, or transfer of securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, or an exemption therefrom. corcentric 2

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