I'm not a libertarian, but at least in the US I believe they hate the idea of corporate personhood as much as anyone else. I'm fairly sure Ron Paul (outspoken libertarian and republican representative from Texas) is against corporate personhood.
The first hit of a google search for "ron paul corporate personhood" turns up a blog with this video
It's concerning how unpopular this idea is and yet it still remains policy. Is it political suicide to speak out against corporate personhood, or would a law limiting personhood to individual citizens be unconstitutional?