(Bloomberg) -- One of the largest exchange-traded funds in the world was left at the widest premium to its underlying holdings since 2008 at the end of Wednesday’s historic session.Most Read from BloombergMidtown Office Building Evacuated on Concerns of Wall CollapseIn Chicago, a Former Steel Mill Looks to Make a Quantum LeapThe Secret Formula for Faster TrainsHelicopter Crashes Into Hudson River With Multiple FatalitiesInside the Quiet, Extravagant Expansion of the Frick CollectionIn another si