Shares of all six listed Adani Group companies -- Adani Enterprises, Adani Ports and Special Economic Zone, Adani Power, Adani Transmission, Adani Green Energy and Adani Total Gas -- were under pressure on Monday as they fell up to 20 per cent in intra-day trade on report that National Securities Depository Ltd (NSDL) has frozen accounts of three foreign funds that own stake in four of these group companies.