One Clearinghouse, Many Options Exchanges
Every US listed options contract clears at one clearinghouse, and the options exchanges compete on fees and allocation. The venue count is dated, not fixed.
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Partial Assignment of Short Options
Partial assignment happens when only some of your short options are exercised. See how the OCC and your broker allocate, and what the leftover stub means.
Why Open Interest Updates Only Once a Day
Open interest updates once a day, after overnight clearing. See why the OI column you read at noon is yesterday's number, and what volume shows instead.
What Happens If an Option Expires In the Money
If an option expires in the money by at least $0.01, the OCC exercises it automatically. See what the long and short sides owe, and what pin risk costs.