The London Stock Exchange (LSE.L) is to buy Canada's TMX (X.TO) to claw back lost market share and create the world's fourth-largest bourse trading $4.1 trillion of stock a year. Shares in the LSE, first established in 1698, jumped 9 percent as markets welcomed the all-share deal, and indicating a per share valuation for TMX of C$46.7, up 16 percent. The deal would create the No. 1 global centre of mining and energy stock trading and values the Toronto group at about $3.2 billion.
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