Osler, Hoskin & Harcourt LLP is one of Canada's largest business law firms practising nationally and internationally from its offices in Canada and New York. It is one of Bay Street's "Seven Sisters". Clients include industry and business leaders in all segments of the market and at various stages in the growth of their businesses. With over 470 lawyers, Osler, Hoskin & Harcourt LLP is one of the country’s ten largest law firms, and is one of only two Canadian firms ranked top tier in five of six categories in the 2011 edition of IFLR 1000: The Guide to the Leading Financial Law Firms. Clients are quoted as saying that Osler is an “outstanding firm and the lawyers give exceptional service,” in Chambers Global: The World’s Leading Lawyers for Business 2011. In 2011, the firm ranked first in the Thomson Reuters league tables for Canadian mergers and acquisitions, advising on more dollars' worth of announced deals than any of its domestic competitors in the first nine months of 2011. In all, Osler’s lawyers were retained for 49 Canadian deals worth a total of $24 billion, or 21 per cent of the new market.