| Formation of Subex | 5th October, 1992 |
| Incorporation as Subex Systems Private Limited | 6th December, 1994 |
| Change of name to Subex Systems Limited(Post conversion to public limited company) | 16th November, 1995 |
| Date of IPO | 19th – 23rd July, 1999 |
| Subex shares listed in Bangalore Stock Exchange | 3rd September, 1999 |
| Subex shares listed in Mumbai Stock Exchange | 31st July, 2000 |
| Subex shares listed in National Stock Exchange | 5th September, 2003 |
| Acquisition of the Fraud Management activity of Alcatel, UK | 1st October, 2004 |
| Acquisition of Fraud Centurion from Lightbridge, US | 1st October, 2004 |
| Global Depository Receipts (GDRs) listing in Luxembourg Stock Exchange (LxSE) | 7th April, 2006 |
| Announcement of acquisition of Azure Solutions, UK | 25th April, 2006 |
| Closure of acquisition of Azure Solutions, UK and Change of name to Subex Azure Limited | 23rd June, 2006 |
| Announcement of acquisition of Syndesis Ltd, Canada | 18th January, 2007 |
| GDR listing in London Stock Exchange | 14th March, 2007 |
| Closure of acquisition of Syndesis Ltd | 1st April, 2007 |
| Change of name to Subex Limited | 30th November, 2007 |
| Announcement of exchange offer for restructuring of FCCBs | 24th September, 2009 |
| Completion of exchange offer and issuance of Restructured FCCBs | 2nd November, 2009 |
| Listing of Restructured FCCBs on Singapore Exchange Securities Limited (SGX) | 6th November, 2009 |
| Completion of exchange offer and issuance of Restructured FCCBs US$ 127.721 Million | 6th July, 2012 |
| Listing of Restructured FCCBs US$ 127.721 Million on Singapore Exchange Securities Limited (SGX) | 10th July 2012 |
| Reset of conversion price of FCCBs US$ 127.721 Million from the original price of Rs. 22.79 to Rs. 13 (Board’s approval) | 14th May, 2015 |
| Reset of conversion price of FCCBs US$ 127.721 Million from the original price of Rs. 22.79 to Rs. 13 (Shareholder’s approval) | 19th June, 2015 |
| Redemption of Outstanding US$ 1,000,000 out of US$ 180,000,000 2% Coupon Convertible Bonds due March 9, 2017 “FCCB I” listed on the London Stock Exchange. | 6th March, 2017 |
| Redemption of Outstanding US$ 1,400,000 out of US$ 98,700,000 5% Convertible Unsecured Bonds due March 9, 2017 “FCCB II” listed on the Singapore Exchange Securities Trading Limited. | 6th March, 2017 |
| Redemption of Outstanding US$ 3,600,000 out of US$ 127,721,000 5.70% Secured Convertible Bonds due July 7, 2017 “FCCB III” listed on the Singapore Exchange Securities Trading Limited | 7th July, 2017 |
| GDR delisting in London Stock Exchange | 26th September, 2022 |
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