Quote from cdcaveman:
Whats the deal with time flys..... is there usually only and edge in commodities in these structures? or like if you had the month of dec was a announcment month and you wantedt get short nov long nov... Could you short addition premium by going short the oct/nov calender to get even more short nov.... whats the ideal situation to use time flys? time flys meaning +1/-2/+1 across the term structure or -1/+2/-1 i remember there being marging implications on short calenders.
Quote from atticus:
Can be a lot of edge into the vol-ramp into earnings. Say you're 50 days out from GOOG's earnings and you buy the body in the reporting month and sell the "wing" months. You're still short some gamma if trading ATM, so you still need to be within one sigma on realized vol to earn.
Quote from marameo:
I have a question about long-term butterflies; why are they usually cheaper with months to go and become more expensive when expiration date is approaching?
Would it be good to open them alobng the way?
Quote from atticus:
I agree that flies are a poor long vol trade. Why limit the outlier for what's often a asymmetric risk? A straddle and a fly converge as you add width to the strikes, so if you knock the fly it's also an argument against the straddle. Narrow flies are not a bet on anything but a pin.
Gamma trading an ATM option IS a straddle.
So what to trade for the upstairs guy who wants long vola and doesn't want to ratio into some moronic naked short wing calendar? (Why trade the ratio calendar/diag when it quickly flips modality on vega?)
I like 1:1 diags which solve for a minimal gain if DITM, but hit max payout at mid (between spot and strike). Nearly flat gamma and a few thetas.