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CME Globex follows a specific set of rules to determine the TOP:

Rule 1: Determine the maximum matching quantity at a price level.

Rule 2: Determine the minimum non-matching quantity.

Rule 3: Determine the highest price if non-matching quantity is on the buy side for all prices.

Rule 4: Determine the lowest price if non-matching quantity is on the sell side for all prices.

Rule 5: Determine the closest price to the settlement price (reference price).

Rules are applied in a hierarchy from Rule 1 through Rule 5. The TOP is determined by whichever rule best applies to the order book at that moment.