You are right, you can't, but I was attempting to answer a different question. You can control whether you choose to settle your trade in dollars (GLPYY) or euros (GLPG.BR). You can also control the timing of your purchase and sale. I haven't run the numbers yet but just eyeballing it, if you were to convert your shares back into USD today, the gain in GLPG.BR's stock price over the last few weeks looks like it was completely offset by the the stronger dollar. In comparison, the ADRs are up ~ 10% over the same time period.
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