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system
two 1099b for same stock
user
it looks like what you're calling a name change was registered as a merger that resulted in an exchange of stock.  if that's the case, then what you've been told is correct.  you've got one long-term sale and one short-term sale. based a quick read of the form 8937 that was filed, it looks like there were multiple entities involved in this event, more than one of which existed prior to it. https://www.mylan.com/-/media/mylancom/files/form%208937%20for%20mylan%20n%20v.pdf
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