In 2015 Mylan Labs changed their name to Mylan NV after they moved to the Netherlands. Shortly after that I took possession of my stock and placed it with my broker to sell. For my taxes I received two 1099 B forms. Apparently, Mylan NV felt that issuing a stock for a name change constituted a sale. I also received a 1099B from my broker for the actual sale. So far, I've been told that I have to show the first sale as a long term (held the stock for about 20yrs.) and the actual sale as a short term. Isn't there some way to waiver the first sale as just a name change and use a long term sale for the actual sale?
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.