The Security rating over time widget is on the ROI dashboard (MAX > Customer portal > ROI tab).
A stacked bar chart showing, for each of the last 12 months, how many managed vendors held each SecurityScorecard letter grade (A through F). Each bar represents one month, and the colored segments show the vendor count at each grade for that month. This widget tracks the overall security posture of the customer's vendor portfolio over time, independent of incident-likelihood ratings. A rising share of A/B-grade vendors indicates improving vendor security posture under MAX management.