I recently started a small position in the ADR, GLPYY. If you are converting $'s to make your purchase, an additional consideration is that GLPG.BR, unlike the GLPYY, has currency risk. In the last few weeks, the $USD has strengthened considerably versus the $EUR resulting in ~ 7% greater purchasing power. If i was making my purchase in the next few weeks, I'd probably bet on the $USD continuing to strengthen and buy GLPG.BR with it's greater liquidity.
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