Why the ratio for 2/10 curve trade is 3:1 on the CME website rather than >4:1?

All of the shorter duration futures hedge ratios tend to change more severely as the CTD changes. Eurex Schatz a great case in point.
 
Thanks for your answers.

Where can I find the appropriate hedge ratios for later contracts for example the June 10yr vs June 2yr contract (or where I can find the CTD for these contracts? I can calculate the ratios)?

I want to get into a 2/10 flattener trade but the March contracts are about to expire. I want to use the June futures so that I don't need to roll that often.
 
Hahaha, thanks for kind words, bone...

Cyrix, currently the CTDs for Jun contracts are: 2.5% Mar13 for the 2y and 3.5% Feb18. This gives me an approx ratio of 1610 2y contracts per 1000 10y contracts.
 
Thanks, but these four links don't seem to contain Martin's

"currently the CTDs for Jun contracts are: 2.5% Mar13 for the 2y and 3.5% Feb18".

Maybe I need to go deeper into the other links on the website?
Please advise.
 
Eurex and CBOT publish the current CTD's on their website, in addition to OffTR issue conversion factors.
 
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