| 1976 | IFX PAYMENTS |
| 1977 | IFX UK LTD |
| 1978 | IFXBG LIMITED |
| 1979 | IG GROUP HOLDINGS PLC. |
| 1980 | IG MARKETS |
| 1981 | IK INVESTMENT PARTNERS LIMITED |
| 1982 | IKB DEUTSCHE INDUSTRIEBANK AG LONDON BRANCH |
| 1983 | IKON CAPITAL LIMITED |
| 1984 | IKOS PARTNERS |
| 1985 | IKOS SECURITIES LTD |
| 1986 | ILEX ASSET MANAGEMENT (UK) LLP |
| 1987 | ILLIQUIDX LIMITED |
| 1988 | ILLIQUIDX LLP |
| 1989 | IMAS CORPORATE ADVISORS LIMITED |
| 1990 | IMC SECURITIES B.V. LONDON BRANCH |
| 1991 | IMI CAPITAL MARKETS (UK) LIMITED |
| 1992 | IMI WEB (UK) LTD |
| 1993 | IMPAX ASSET MANAGEMENT LIMITED |
| 1994 | IMPAX CAPITAL LIMITED |
| 1995 | IMPERIAL CAPITAL (INTERNATIONAL) LLP |
| 1996 | IMPERIAL-CLEARING SERVICES LTD |
| 1997 | IMPIVAARA SECURITIES LTD |
| 1998 | INCAVEST SECURITIES LIMITED |
| 1999 | IND X SECURITIES LTD |
| 2000 | INDEPENDENT CAPITAL CORPORATION LIMITED |