Security Citigroup’s CFO Mark Mason: Cybersecurity costs are surging "One of the most rapidly growing expense line items" -- with Zscaler and CyberArk among the vendors getting paid. Edward Targett Sep 19, 2024 - 2 min read Mark Mason, Citigroup's chief financial officer. Credit: Citigroup Get the full story: Subscribe for free Get the story, a weekly newsletter (you can turn that off if you want) and help us fight bots and feral algorithms. Subscribe today. Subscribe now Already a member? Sign in