C has the MM who sell huge options every month and week.

10/15 is a monthly option expiation and 60000 call options on $70 is there to be expired.

MMs will try to keep this down around $70.00 not have to cover after expiration every week and month.

That's why C plummet after earning most of time, whether the ER was good or not.$Citigroup(C)$