A comment to another question of mine asked me "Do you know any separable loan word?".
I can't think of any, off-hand. Are there any? One would be enough to answer the question.
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As you can infer from the other answer and comments below, we would have to narrow down the definition of a loan verb.
If it were sufficient enough that the root of the verb is not of Germanic roots, then there are certainly verbs.
All these seperable verbs, however, have a Germanic prefix. These are not pure non-Germanic verbs and to my mind we should rather take a look at verbs that have foreign prefixes. Pure non-Germanic words.
Having taken a look at the list of foreign prefixes on canoonet, I can't think of any verb with those prefixes that is separable. I dare say there is no such a verb.
"Downloaden" and "uploaden" are mentioned by Wikipedia as separable verbs sometimes.
Something of interest is that there are plenty of verbs that have been borrowed from English that, whilst don't have a separable prefix, have an inseparable one whose stress doesn't lie on the first syllable and thus does not take "ge-" in the past participle.
Examples off the top of my head include: