Advent Investor Presentation Deck

DISCLAIMER The information, opinions, estimates, projections, forecasts, targets, or prospects contained in this presentation are provided as at the date of this presentation and are subject to change without notice. This presentation contains financial information prepared in accordance with U.S. generally accepting accounting principles ("GAAP") that have been extracted without material adjustment from audited GAAP financial statements and/or extracted or derived from unaudited accounting records that have been used to prepare GAAP financial statements. This presentation also contains certain non-GAAP financial measures which have not been and will not be audited. These non-GAAP financial measures are not recognized measures of financial performance or liquidity under GAAP, but are measures used by the management of Advent Technology Holdings, Inc. ("Advent") to monitor the underlying performance of Advent's business and operations. These non-GAAP measures may not be indicative of Advent's historical operating results nor are such measures meant to be predicative of future results. These measures and ratios may not be comparable to those used by other companies under the same or similar names. As such, undue reliance should not be placed on these non-GAAP financial measures. Advent is not able to provide a reconciliation of the Company's non-GAAP financial guidance to the corresponding GAAP measures without unreasonable effort because of the inherent difficulty in forecasting and quantifying certain amounts necessary for such a reconciliation. Certain financial information contained herein is unaudited and is based on internal records and/or estimates. This presentation contains certain forward-looking information which may not be included in future public filings or investor guidance. The inclusion of financial information or metrics in this presentation should not be construed as a commitment by Advent to provide guidance on such information in the future. The information contained in this presentation is the property of Advent. This presentation may not be copied, published, reproduced or distributed in whole or in part at any time without the prior written consent of Advent. The trademarks and trademark symbols used herein are the properties of their respective owners. This presentation contains financial forecasts with respect to Advent's estimated future performance. Advent's independent auditors have not audited, reviewed, compiled or performed any procedures with respect to the projections for the purpose of their inclusion in this presentation and, accordingly, have not expressed an opinion or provided any other form of assurance with respect thereto for the purpose of this presentation. These projections should not be relied upon as being necessarily indicative of future results. In this presentation certain of the above-mentioned projected financial information has been included (in each case, with an indication that the information is an estimate and is subject to the qualifications presented herein) 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 Advent or that actual results will not differ materially from those presented in the prospective financial information. Inclusion of the prospective financial information in this Investor Presentation should not be regarded as a representation by any person that the results contained in the prospective financial information will be achieved. The financial forecasts reflect assumptions that are subject to change, and there can be no assurance that Advent's financial condition or results of operations will be consistent with those set forth in such analyses and forecasts. ADVENT Any Fuel. Anywhere. 2

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