Stronger Defenses, Built Together No company fights modern threats alone. How security alliances share intelligence, pool expertise, and respond to incidents as one front.

A formal group of organizations — companies, agencies, or sector peers — that agree to share threat intelligence, coordinate incident response, and raise each other's defenses.

Because attackers reuse the same tools across a whole sector. Sharing indicators costs little and buys every member earlier warning — ISACs in finance, health, and energy run on exactly this logic.

Most sector alliances (ISACs and ISAOs) accept organizations of any size in their industry; smaller regional and cross-sector groups exist too. Vetting and a sharing agreement are the usual entry steps.