Question

Since companies are rated on a bell curve, will our score decrease if other companies improve?

Your absolute score will not decrease: it is calculated based solely on the evidence you submit. Your relative position — and therefore your medal tier — can change if the peer group improves faster than your management system. A score of 72/100 that earned Silver in a previous cycle may now sit at the top of Bronze if the Silver threshold has risen. This is exactly what has been happening: ESGIM's benchmarking data shows consistent upward pressure on medal thresholds across all levels. Companies maintaining a score rather than improving it should expect their medal tier to come under pressure at reassessment.