Iridium Communications Inc. (IRDM) recently announced its fourth stock repurchase authorization in four years. The latest 500millionauthorization,approvedbyitsboardofdirectors,isthelargestinthecompany′shistory.Itextendsthetotalbuybackauthorizationto1.5 billion through Dec. 31, 2027. Iridium's stock repurchase program began in February 2021 with an initial authorization of 300million.Thiswasfollowedbyanother300 million in March 2022 and $400 million in July 2023. The executi ...