Sam's Club, a Walmart-owned membership warehouse club chain, is investigating the alleged Cl0p ransomware security breach.The Cl0p ransomware group listed Sam's Club among its victims, accusing the company of ignoring security.Sam's Club announced that it is actively investigating the matter, but has seen no evidence of a breach.In December 2024, the Cl0p ransomware group claimed to have breached multiple companies through the Cleo file transfer software vulnerability.