The price of a security compared to its recent or current fundamentals is its rating. A share with a high PE ratio or a high EV/EBITDA is said to have a high rating.

If a rating changes significantly, then the share is said to have been rerated by the market.

A high rating may reflect growth prospects (or perceived growth prospects), earnings quality, market sentiment, or anything else that justifies a premium price.

An apparently high rating on one metric (e.g. a PE) may not be reflected by other metrics (e.g. price/book). In this case it is the rating on the metrics appropriate to the business and sector that should be used to judge whether a rating is high or low.

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