How does OSINT security grading work in Supplier Shield?

Acuna grades each vendor's public-facing security posture from A to F and refreshes it daily. This is OSINT, open-source intelligence: an outside-in signal, drawn entirely from a vendor's public footprint, that you hold against what they claim in their questionnaire. The OSINT security grade reflects five areas: email and domain security, encryption, web security, breach exposure, and reputation. You can open any grade to see what drove it. The grade sits alongside the three-dimension risk tier (dependency, reach, impact) on the supplier's profile.