ADN - Advent Technologies Holdings Inc (ADN) Q3 2021 Earnings Call Transcript November, 15 2021 03:30 PM Advent Technologies Holdings Inc Cl A Image source: The Motley Fool. Advent Technologies Holdings, Inc (NASDAQ: ADN) Q3 2021 Earnings Call Nov 15, 2021 , 9:00 a.m. ET Operator Continue reading For further details see: Advent Technologies Holdings, Inc (ADN) Q3 2021 Earnings Call Transcript