Securities and Exchange Board of India (SEBI) is preparing to further tighten norms for debt mutual funds in its upcoming board meeting slated for Aug 21, 2019, media reports. The capital market regulator is expected to declare modifications in the framework of liquid funds and propose shifting to mark-to-market valuation. SEBI may also reduce the limit for unrated debt from 25% to 5% of the net asset value (NAV).