Markets regulator Sebi on Monday asked qualified stock brokers to offer either the facility of trading in the secondary market using the UPI-based block mechanism to their clients similar to the ASBA facility or a three-in-one trading account facility from February 1. These qualified stock brokers brokers (QSBs) must offer one of these two options, in addition to the current mode of trading. Markets regulator Sebi on Monday asked qualified stock brokers to offer either the facility of trading in the secondary market using the UPI-based block mechanism to their clients similar to the ASBA facility or a three-in-one trading account facility from February 1. These qualified stock brokers brokers (QSBs) must offer one of these two options, in addition to the current mode of trading. Economic Times