A man walks past a glass wall with logos of the Tokyo Stock Exchange at the bourse in Tokyo November 4, 2010. REUTERS/Yuriko Nakao Call it the survival instinct. The flurry of mergers and alliances underway in the global exchanges industry has served as a call to action for the Tokyo Stock Exchange, which may begin merger talks with its main Japanese rival Osaka Securities Exchange as it seeks out ways to survive consolidation sweeping the sector.

Meanwhile, some of Canada’s big banks are protesting the London Stock Exchange’s proposed $3.2 billion takeover of Toronto Stock Exchange parent, TMX Group. Bank executives told a hearing that the deal threatens Toronto’s status as a global financial hub and could harm the prospects of Canadian companies looking to raise funds on public markets.

HCA, the biggest U.S. for-profit hospital chain, made history on Wednesday when it pulled off the largest private-equity backed initial public offering ever. Investors snapped up more shares than expected in the $3.79 billion IPO, shrugging off the hospital operator’s high debt levels as the market for newly traded shares heats up. Check out our list of the ten largest U.S. private equity-backed IPOs.

“Since Groupon declined a Google $6 billion buyout offer, hundreds of companies have launched, trying to emulate its business model by targeting narrow slices of the market,” writes Jessica Bruder of the NYT’s DealBook.

Starbucks is teaming up with Green Mountain Coffee Roasters to break into the fast-growing single-serve coffee market.