Best fractional CISOs for professional services firms

3 firms offer fractional CISO work and name professional services firms among the clients they serve. First on the list are Leadership Services, Cyber Defense Group and CypherLeap. One publishes a monthly fee: $2,280 a month at Leadership Services. The rest quote.

Updated 21 Oct 2026 Listed 3 Order published rule

A fractional CISO owns security strategy, policies, compliance frameworks, vendor risk, incident response planning and the answers on customer security questionnaires.

How this list is built. Every firm here offers fractional CISO work on its own site and names professional services firms among its clients. Order is editor's pick, then firms that name the industry, then a published fee, then name. Nobody pays to appear or to move up. Full methodology.