 BOSTON--BUSINESS WIRE--Advent Technologies Holdings, Inc. NASDAQ: ADN Advent, an innovation-driven company in the fuel cell and hydrogen technology space, today announced it is set to join the U.S. broad-market Russell 3000 Index at the conclusion of this years Russell indexes annual reconstitution. The preliminary list of additions was released earlier this month on June 4, 2021, and the final additions will become effective after the U.S. market opens on June 28, 2021. Annual Russel 