Chicago Board Options Exchange, Incorporated (CBOE) utilizes modified HOSS opening procedures for all option series that are used to calculate the exercise/final settlement value for expiring volatility index options and futures contracts. These option series are referred to as "constituent option series". The modified HOSS opening procedures described in CBOE Regulatory Circular RG15-133 and CFE Regulatory Circular RG15-022 apply to all constituent option series on any expiration/final settlement date for volatility index options and futures.
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