(Corrects September 30 story to say that roll out of rules for algo trading is being extended)(Reuters) -India's markets regulator has extended the timeline to roll out algorithmic trading rules for retail investors, giving stock brokers more time to upgrade their computer networks for ensuring safer participation. Retail algo trading, which allows investors to use automated strategies via computer programs, will be offered through application programming interfaces (APIs). The Securities and Exchange Board of India said that full registration of API-based retail algo products must be completed by November 30. The measures follow the SEBI's earlier circular that introduced rules for the approval, tracking and regulation of algo trading for individual investors. According to a SEBI study, algorithmic trading made up 97% of foreign investor and 96% of proprietary trader profits in futures and options during FY24.