Advent Investor Presentation Deck

ADVENT EXECUTES ON BUSINESS PLAN POST NASDAQ ENTRY San Francisco Bay Area, USA Advent has approximately 190 patents issued, licensed, or pending and has accessed its own and the 3rd party global HT- PEM investment of partners to create the leading next- generation fuel cell technology provider. First LT-PEM fuel cells 1960s Advent HT-PEM Gen 1 2006 R&D with NASA, ESA, DOE 04 2012 DOE NASA ESA ADVENT Advent-BASF HT-PEM Gen 2 2013 DoE selects Advent for L'Innovator Joint Dev. Program BASF Boston and Charlestown, MA, USA 2018 *This number includes part-time employees and contractors. LOS ALAMOS SAFRAN & ESS expand program contracts NREL 170+ 38 Employees Successful R&D Programs BROOKHAVEN 2019 Advent enters NASDAQ ("ADN") Raises $158 million ESS 2021 NASDAQ SAFRAN UltraCell Acquisition Aalborg. Denmark 2021 Q1 New Boston & Europe production facilities under construction UltraCell HIGH POWER MICRO FUEL CELLS A Bren-Tronics Company Sartenergy 700+ Combined Technical Years of Experience Achern, Germany UltraCell expands DoD contract TARA N HT-PEM Gen 3 launch with LANL Patras and Athens, Greece 190 Patents Issued, Licensed, or Pending 2021 Q2 Mobility next-gen Fuel Cell under development Acquisition Serenergy A/S (Denmark) and fischer eco solutions GmbH (Germany) Any Fuel. Anywhere. 2021 Q3 Serene-5 10

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