A Canadian perspective:
“So maybe you didn’t lose a night’s sleep when the TMX group, the owner of the Toronto Stock Exchange, announced plans to merge with the London Stock Exchange Group. But the change in ownership of Canada’s biggest stock exchange might be a wake-up call.”
See http://rabble.ca/columnists/2011/02/should-you-care-who-owns-toronto-stock-exchange.
See also
http://www.embassymag.ca/page/view/tmx-02-16-2011
http://www.financialpost.com/news/mining/LONDON+CALLING/4269844/story.html
http://www.financialpost.com/news/mining/Canadian+mining+industry+cheers+deal/4252014/story.html
http://www.financialpost.com/news/mining/Mining+industry+upheaval+feared+exchange+merger/4269081/story.html