Energy Vault Holdings is trading 5.45% lower at $2.60, with the cause of the October 21, 2026 decline unclear. - The available company newsroom page shows no announcement dated October 21 and provides no evidence tying the decline to company news; an earlier revenue outlook update is not a clear explanation. - Broader indices were higher during the session, so the supplied market context does not establish a same-direction market explanation. - No reliable volume or trading-activity detail was found.