The following is a list of mergers of securities firms.
| Year Merger closed | Acquirer | Acquired firm | Name of merged entity | |
|---|---|---|---|---|
| 1931 | Harriman Brothers & Company | Brown Bros. & Co. | Brown Brothers Harriman & Co. | |
| 1938 | Charles D. Barney & Co. | Edward B. Smith & Co. | Smith Barney & Co. | |
| 1940 | Merrill Lynch | E. A. Pierce & Co. | Merrill Lynch | |
| 1940 | Merrill Lynch | Cassatt & Co. | Merrill Lynch | |
| 1942 | Paine, Webber & Co. | Jackson & Curtis | Paine, Webber, Jackson & Curtis | |
| 1946 | First Boston Corporation | Mellon Securities Corporation | First Boston Corporation | |
| 1947 | Lonsdale Investment Trust | Robert Benson & Co. | Robert Benson Lonsdale | |
| 1956 | Eastman Dillon & Co. | Union Securities | Eastman Dillon Union Securities & Co. | |
| 1957 | S. G. Warburg & Co. | Seligman Bros. | S. G. Warburg & Co. | |
| - | 1961 | Robert Benson Lonsdale | Kleinwort, Sons & Co. | Kleinwort Benson Limited |
| 1965 | Drexel and Company | Harriman, Ripley and Company | Drexel Harriman Ripley | |
| 1965 | Philip Hill, Higginson, Erlanger’s Limited | M. Samuel & Co. | Hill Samuel & Co. | |
| 1970 | Cogan, Berlind, Weill & Levitt | Hayden, Stone & Co. | CBWL-Hayden, Stone, Inc. | |
| 1970 | Mason & Co. | Legg & Co. | Legg Mason & Co. | |
| 1972 | Eastman Dillon Union Securities & Co. | Blyth & Co. | Blyth, Eastman, Dillon & Co. | |
| 1973 | Burnham and Company | Drexel Harriman Ripley | Drexel Burnham and Company | |
| 1973 | Hayden Stone | H. Hentz | Hayden Stone | |
| 1973 | Hayden Stone | Saul Lerner & Company | Hayden Stone | |
| 1974 | Hayden Stone | Shearson, Hammill & Co. | Shearson Hayden Stone | |
| 1975 | Lehman Brothers | Abraham & Co. | Lehman Brothers | |
| 1975 | Smith Barney & Co. | Harris, Upham & Co. | Smith Barney, Harris Upham & Co. | |
| 1976 | Shearson Hayden Stone | Lamson Brothers | Shearson Hayden Stone | |
| 1976 | Shearson Hayden Stone | Faulkner, Dawkins & Sullivan | Shearson Hayden Stone | |
| 1976 | Drexel Burnham and Company | William D. Witter | Drexel Burnham Lambert | |
| 1977 | Lehman Brothers | Kuhn, Loeb & Co. | Lehman Brothers, Kuhn, Loeb | |
| 1977 | Morgan Stanley | Shuman, Agnew & Co | Morgan Stanley | |
| 1977 | Paine Webber | Mitchell Hutchins | Paine Webber | |
| 1978 | Loeb, Rhoades & Co. | Hornblower, Weeks, Noyes & Trask | Loeb, Rhoades, Hornblower & Co. | |
| 1978 | Dean Witter | Reynolds & Co. | Dean Witter Reynolds | |
| 1978 | Merrill Lynch | White Weld & Co. | Merrill Lynch | |
| 1979 | Shearson Hayden Stone | Loeb, Rhoades, Hornblower & Co. | Shearson Loeb Rhoades | |
| 1979 | Paine Webber | Blyth, Eastman Dillon & Co. | Paine Webber | |
| 1981 | Goldman, Sachs & Co. | J. Aron & Co. | Goldman, Sachs & Co. | |
| 1981 | Philipp Brothers | Salomon Brothers | Phibro-Salomon Inc. | |
| 1981 | Prudential Insurance | Halsey, Stuart & Co. | Prudential Securities | |
| 1981 | American Express | Shearson Loeb Rhoades | Shearson/American Express | |
| 1984 | Shearson/American Express | Investors Diversified Services | Shearson/American Express | |
| 1984 | Shearson/American Express | Lehman Brothers, Kuhn, Loeb | Shearson Lehman/American Express | |
| 1987 | Primerica | Smith Barney | Primerica | |
| 1987 | Union Bank of Switzerland | Phillips & Drew | Union Bank of Switzerland | |
| 1987 | TSB Group Plc. | Hill Samuel & Co. | TSB Group Plc. | |
| 1988 | Shearson Lehman/American Express | E.F. Hutton | Shearson Lehman Hutton | |
| 1988 | Credit Suisse | First Boston Corporation | Credit Suisse First Boston | |
| 1988 | Commercial Credit | Primerica | Primerica | |
| 1990 | Deutsche Bank | Morgan Grenfell | Deutsche Bank | |
| 1993 | Primerica | Shearson Lehman Hutton (Brokerage and Asset Management) | Primerica (Smith Barney Shearson) | |
| 1993 | Lehman Brothers (Spinoff from American Express) | Shearson Lehman Hutton | Lehman Brothers | |
| 1995 | Paine Webber | Kidder, Peabody & Co. | PaineWebber Group | |
| 1995 | Swiss Bank Corporation | S. G. Warburg & Co. | Swiss Bank Corporation | |
| 1995 | Dresdner Bank | Kleinwort Benson | Dresdner Kleinwort Benson | |
| 1996 | Chemical Bank | Chase Manhattan Bank | Chase Manhattan Bank | |
| 1996 | Morgan Stanley | Van Kampen American Capital | Morgan Stanley | |
| 1997 | Bankers Trust | Alex. Brown & Sons | Bankers Trust (BT Alex. Brown & Sons) | |
| 1997 | Swiss Bank Corporation | Dillon, Read & Co. | Swiss Bank Corporation (Warburg Dillon Read) | |
| 1997 | Travelers Group | Salomon Brothers | Travelers Group (Salomon Smith Barney) | |
| 1997 | Dean Witter Discover & Co. | Morgan Stanley | Morgan Stanley Dean Witter | |
| 1998 | Union Bank of Switzerland | Swiss Bank Corporation | UBS AG (UBS Warburg) | |
| 1998 | Travelers Group | Citicorp | Citigroup (Salomon Smith Barney) | |
| 1998 | Société Générale | Hambros Bank | Société Générale (SG Hambros Bank Ltd) | |
| 1999 | Deutsche Bank | Bankers Trust | Deutsche Bank (Deutsche Bank Alex. Brown) | |
| 1999 | Chase Manhattan Bank | Hambrecht & Quist | Chase Manhattan Bank | |
| 2000 | PaineWebber Group | J.C. Bradford & Co. | PaineWebber Group | |
| 2000 | UBS AG | PaineWebber Group | UBS AG (UBS Paine Webber) | |
| 2000 | Credit Suisse First Boston | Donaldson, Lufkin & Jenrette | Credit Suisse First Boston | |
| 2000 | Dresdner Kleinwort | Wasserstein Perella & Co. | Dresdner Kleinwort Wasserstein | |
| 2000 | Chase Manhattan Bank | Robert Fleming & Co. | Chase Manhattan Bank | |
| 2001 | Lehman Brothers | Cowen & Co. (PCS Business) | Lehman Brothers | |
| 2001 | Chase Manhattan Bank | J. P. Morgan & Co. | JPMorgan Chase & Co. | |
| 2001 | Société Générale | TCW Group | Société Générale | |
| 2002 | Deutsche Bank | Scudder Investments | Deutsche Bank | |
| 2003 | Lehman Brothers | Crossroads Group | Lehman Brothers | |
| 2003 | Lehman Brothers | Neuberger Berman | Lehman Brothers | |
| 2006 | Lehman Brothers | H.A. Schupf & Co. | Lehman Brothers | |
| 2007 | Wachovia | A. G. Edwards | Wachovia Securities | |
| 2008 | JPMorgan Chase & Co. | Bear Stearns | JPMorgan Chase & Co. | |
| 2008 | Bank of America | Merrill Lynch | BofA Securities | |
| 2008 | Ameriprise Financial | J. & W. Seligman & Co. | Ameriprise Financial | |
| 2009 | Morgan Stanley | Smith Barney |