Duration of a Bond option

sunpak

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Can someone explain the duration of bond option?
I just don’t seem to get it.
Thanks!
 
My guess would be that it’s:
%Δoption price / %ΔYTM of the underlying bond
Where, exactly, did you see it?
 
Fixed Income Portfolio Management - study session 10
 
Duration of option = Delta of option × Duration of underlying instrument × (Price of option)/(Price of underlying)
 
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