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Should an ADR that is being delisted be sold off?
I'm a bit out of my element here, but my guess is the right way to think about this is: knowing what you do now about the underlying company (NZT), pretend they  had never offered ADR shares.  Would you buy their foreign listed shares today? Another way of looking at it would be: would you know how to sell the foreign-listed shares today if you had to do so in an emergency?   If not, I'd also push gently in the direction of selling sooner than later.