What is the Options Regulatory Fee and how is it calculated?

The Options Regulatory Fee (ORF) is a fee which the OCC collects from IBKR on behalf of the U.S. option exchanges and its purpose is to offset the exchanges’ costs relating to the supervision and regulation of the options market.  The fee applies to both option purchases and sales and is assessed at the point of order execution. 

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Options Regulatory Fee (ORF)
What happens at expiration if my long put option is in-the-money?
What happens at expiration if my long call option is in-the-money?
How are the closing prices for U.S. listed securities options determined?