LUGANO, Switzerland & WESTLAKE VILLAGE, Calif. & ROME--(BUSINESS WIRE)--Energy Vault Holdings, Inc. (NYSE: NRGV) ("Energy Vault"), a leader in sustainable, grid-scale energy storage solutions, today announced that they have joined the Russell 2000® Index following the conclusion of the 2022 Russell indexes annual reconstitution, effective today, Monday, June 27, 2022 at market open.