why is the margin for a short VXX option only ~$35 (portfolio account).
E.g. the margin for SPX short options (and also most other options) is relatively much higher.
What do you mean by $35? The OCC shock on VXX is higher than the shock for SPX. House rules for PM margin vary from firm to firm, but in general most have a higher requirement for trading VXX per $ traded.
E.g. shorting an atm VXX option expiration 19th june (10 days) has premium of $60 and margin ist only ~$35.
That's confusing me.
Yes, the VXX shock is definitly higher and so I expected a very high margin for the VXX options.