| 1849 | Harding & Pullein founded in England. Joined by Frederick Whinney |
| 1859 | Whinney made a partner |
| 1889 | G.A. Derrick formed accounting firm of Derrick & Co. |
| 1894 | Arthur Young starts his first firm, Stuart and Young, in Chicago
Harding & Pullein renamed Whinney, Smith & Whinney |
| 1864 | Thomas Clarkson starts a trustee and receivership firm in Toronto |
| 1903 | Alwin and Theodore Ernst form Ernst & Ernst in Cleveland, US |
| 1906 | Arthur and brother Stanley form Arthur Young & Company in Chicago |
| 1912 | McAuliffe, Davis & Hope opened a branch office |
| 1924 | Arthur Young allies with Broad Paterson & Co, England
Ernst & Ernst allies with Whinney, Smith & Whinney |
| 1927 | Evan Wong & Co. formed |
| 1935 | McAuliffe, Davis & Hope bought into Derrick & Co. |
| 1938 | McAuliffe, Davis & Hope merged with Turquand, Youngs & Co. to form McAuliffe, Turquand, Youngs & Co. |
| 1939 | Clarkson allies with Woods Gordon & Co to expand into management consulting |
| 1944 | Clarkson Gordon & Company allies with Arthur Young & Co |
| 1947 | Ee Peng Liang & Co. formed |
| 1951 | Turquand, Youngs, MuAuliffe & Co. became Turquand, Youngs & Co. |
| 1968 | Arthur Young’s joint partnership with Azman Wong Salleh & Co. to become Arthur Young |
| 1974 | Turquand, Youngs & Co. merged with Evan Wong & Co. |
| 1979 | Ernst & Whinney forms and becomes the fourth largest accountancy firm in the world
Arthur Young’s European offices join several large local European firms |
| 1979 | Ernst & Ernst and Turquands & Whinney Murray merged to form
Ernst & Whinney |
| 1986 | Ernst & Whinney merged with Ee Peng Liang & Co. |
| 1989 | Arthur Young merges with Ernst & Whinney to create Ernst & Young |
| 1989 | Ernst & Whinney merged with Arthur Young to form Ernst &Young |
| 2000 | Ernst & Young unveils a new, integrated global organization |
| 2002 | Arthur Andersen merged with Ernst & Young |
| 2008 | Ernst & Young Singapore converted to limited liability partnership |
